164results about How to "Reduced insulation requirements" patented technology

The invention discloses a gravity inductive type axis-counting device and a method for detecting the state of a tract district thereof, relating to a railway transport management device and a management method thereof. The gravity inductive type axis-counting device comprises an axis detector, an axis-counting information processing system, an input-output subsystem and a power supply, wherein the axis detector is composed of a wheel electronic detector and a gravity inductive type sensor unit; the wheel electronic detector consists of an axis-counting CPU unit, a signal processing unit, a sensor power unit and a state detecting unit; the axis-counting information processing unit comprises a CPU unit, a communication unit, and an I / O unit; and the input-output subsystem consists of a dynamic drive assembly unit, a relay and a button. In the method, a wheel signal is detected by a gravity inductive type sensor arranged on a rail, and is transmitted to the wheel electronic detector and the axis-counting information processing unit for processing, thus judging the state of the tract district. The invention has the advantages of accurate detection result, high reliability, scientific method and capability of realizing automatic judgment on the idle and occupied states of the tract district.

The invention discloses a high-voltage direct-current circuit breaker based on a rapid repulsion force mechanism and an insulating transformer. The circuit breaker topologically comprises a current conversion branch circuit, a main circuit breaker branch circuit, a rapid switching energy supply unit, a main loop electric reactor unit and a main loop isolation switching unit. The current conversion branch circuit is an LC oscillation branch circuit. The main circuit breaker branch circuit is formed by connecting an adjustable electric reactor and a plurality of rapid switching energy absorption voltage-sharing modules in series. Each rapid switching energy absorption voltage-sharing module is formed by connecting a rapid switch, a lightning arrester and an RC voltage-sharing branch circuit in parallel. The rapid switching energy supply unit ensures rapidity and cooperativity of actions of the rapid switches. The main loop electric reactor unit is used for reducing a fault current ascending rate. The main loop isolation switching unit is used for protecting internal components after the circuit breaker conducts breaking successfully. According to the high-voltage direct-current circuit breaker, on the basis of the rapid repulsion force mechanism and the insulating transformer, the breaking speed is high, the fault current is prevented from ascending to the larger amplitude, the voltage level borne by the circuit breaker is high, breaking reliability is high, the structure is simple, and the manufacturing cost is low.

A current transformer for energy conversion in a super-conductive energy storage system utilizes a two-stage boost-chopper to fulfill boost control for discharge process in super-conductive energy storage magnets. The first stage of the chopper circuit adopts a plurality of metal oxide semi-conductor field-effect transistors in parallel connection, so that the voltage on both ends of a super-conductive magnet can be limited in a rather low voltage level to meet the insulation requirements of the super-conductive magnet. The second stage of the chopper circuit increases the voltage to a higher level, and utilizes IGBTs as switch components to regulate subsequent output voltage through adjusting the switch duty cycle of the IGBTs through a PWM control mode, so as to fulfill the adjustable target for subsequent output voltage and the controllable target of the super-conductive magnet discharge voltage. The invention can realize energy output in the super-conductive energy storage magnet in a constant-voltage and DC mode, in order to meet the requirements for subsequent voltage-type loads. Meanwhile, the output voltage of the current transformer is not limited by insulating strength of magnets, but can fulfill flexible regulation according to subsequent load, and meanwhile, avoid the large volume problems with transformers or the multiple circuit topology structure.

The invention discloses a discharge electrode structure of a plasma air purification device. The electrode structure comprises a positive electrode group and a negative electrode group, wherein at least one of the positive electrode group and the negative electrode group is wrapped with insulating medium; and the two electrode groups contact directly, such that a contact point is formed. According to the invention, the discharge electrode structure is applied to the plasma air purification device, so a great amount of low temperature plasma is generated at an electrode intersection and a nearby area of the electrode intersection through the structure; the low temperature plasma has properties of glow-like plasma, wide sterilization range, high sterilization rate, short time consumption and low power consumption; in addition, the adopted net-like structure can not only ensure good air permeability but also enlarge the actual plasma function area, therefore, the sterilization rate is further improved.

The invention relates to an improved method for manufacturing a bamboo / wood recombined material. The method comprises the following steps of: (1) forming the parallel connection between the load of bamboo wood and a high-frequency oscillation circuit of a high-frequency generator; (2) placing a bamboo recombined material or wood recombined material board blank 7 in the space formed among middle pressure boards 5 and among the middle pressure boards, a lower machine frame 1 and a pressure head 10 in the event of processing; and (3) thermally pressing and gluing at high frequency, specifically comprising: (1) preparing for unit materials; (2) drying the unit materials; (3) gumming and drying again; (4) assembling; (5) pre-pressing and packaging; and (6) heating and gluing at high frequency.The method disclosed by the invention has the advantages that: the problem that surface adhesive becomes fragile because of being excessively solidified or the poor gluing phenomenon because core adhesive is not solidified can be avoided; the good gluing quality is achieved by using lower pressure; the formation gluing pressure of the bamboo / wood recombined material is less than or equal to 8 MPa; and the thermal pressing and gluing period is short.

The invention relates to a wireless power transmission device which is composed of four coils of a transmitting coil (10), a transmitting terminal amplifying coil (20), a receiving terminal amplifying coil (30) and a receiving coil (40) which are parallelly arranged, and the four coils are all in parallel connection with variable resonance compensation capacitors ( C1, C2, C3 and C4). The transmitting coil (10) and the transmitting terminal amplifying coil (20) form a transmitter, and the receiving terminal amplifying coil (30) and the receiving coil (40) form a receiver.

The invention provides an isolation double-stage chain type current transformer applied to energy storage of a high-capacity battery. A bidirectional isolation full-bridge current transformer with a high-frequency isolation current transformer is additionally arranged between each H bridge module of a conventional chain type current transformer and the battery, so that a battery side is insulated from a high-voltage power grid. The bidirectional isolation full-bridge current transformer is controlled to keep voltage of a middle direct-current side; meanwhile, secondary pulse power on the battery side of the chain type current transformer can be buffered; a chain type energy-storing current transformer can be used as an interface of battery energy storage and the power grid, so that high-voltage direct-current grid connection can be realized, the power dispatching of the power grid is accomplished, and the volumes of harmonic and filter elements of an energy storage system, which are accessed into the power grid, can also be reduced. According to the isolation double-stage chain type current transformer disclosed by the invention, the requirements on an insulation grade of a battery module can be reduced, the secondary pulse power on the battery side is reduced, and the safety and the reliability of the battery are guaranteed; and meanwhile, different types of batteries with different voltage grades can be accessed so that the isolation double-stage chain type current transformer can be easily produced in a large scale, and is suitable for a large-capacity, high-voltage and grid-connected battery energy storing system.

The invention relate to breaker, especially to super high-voltage circuit breaker in use for GIS. The disclosed breaker includes breaking contactor mechanism, and operating mechanism for switching on / off resistances, and controlling action of breaking contactor mechanism. Through pull rod and regulating lever, one set of operating mechanism can control two sets of breaking contactor mechanism since technique of adjusting compression spring for moving contactor is utilized. The invention possesses breaking function at double speed, reduces kinetic resistance of moving contactor, and quickens breaking speed. Stepped breaking technique adopted in the invention lowers over voltage of operation greatly, as well as increases rated capacity and breaking capacity greatly. The invention also reduces cost of equipment and difficulties for manufacturing the disclosed breaker.

The invention relates to an electrified railway in-phase power supply device. The device comprises at least one in-phase power supply unit. Each in-phase power supply unit is connected in parallel between an input power supply arm and an output power supply arm; the in-phase power supply unit comprises an input transformer and an output transformer with a plurality of completely the same secondary windings; a back-to-back AC-DC-AC circuit is connected between each pair of secondary windings of the two transformers; a rectification side of the circuit is connected with the secondary winding corresponding to the input transformer, while an inversion side thereof is connected with the secondary winding corresponding to the output transformer; DC sides of the back-to-back AC-DC-AC circuit of each in-phase power supply unit share one supporting capacitance; and the supporting capacitances of the in-phase power supply units are connected in parallel by isolation switches at both ends of thein-phase power supply units. The electrified railway in-phase power supply device adopts the design of modularization of the in-phase power supply units, improves stability and expansibility of the system, adopts a plurality of low-power transformers to replace single high-power transformer and reduces requirements on design, manufacture, maintenance difficulty and insulation of the transformer.

The invention relates to a hybrid energy storage converter device and an operation control method thereof. According to the hybrid energy storage converter device, two independent energy storage media, i.e. a lead-acid storage battery and a super capacitor, are connected into a circuit to guarantee the independencies of the lead-acid storage battery and the super capacitor; the main circuit of the energy storage converter device adopts a two-stage conversion topological structure of AC(alternating current) / DC(direct current)+DC / DC, and the operation reliability is higher; when the energy storage device is started to operate, the lead-acid storage battery and the super capacitor enter a hybrid working mode to realize the advantage complementation of electric energy; when a certain energy storage medium fails, a loop in which the energy storage medium is positioned is cut off so as to realize the coordination control of the lead-acid storage battery and the super capacitor; and the technical problem that the traditional energy storage device can not satisfy the requirement of a large-scale energy storage system is solved.

The invention relates to a preparation method of a high-purity graphite material, and relates to a preparation method of high-purity graphite. The object of the invention is to solve some problems existing in preparation processes of existing high-purity graphite materials. The method comprises the following specific steps: (1) taking raw material graphite, putting the raw material graphite into aself-made graphite purification device, conducting heating to 1000 DEG C under nitrogen protection, and introducing a certain amount of halogen-containing mixed gas loaded by nitrogen at 1000-1800 DEG C for treatment for 0.5-2.0 h; and (2) continuing to raise the temperature of a solid product obtained after treatment in the step (1) to 2300 DEG C, and introducing a certain amount of gas at 2000to 2300 DEG C for treatment for 1 to 2.0 h, so as to obtain the high-purity graphite. The preparation method of the high-purity graphite provided by the invention can reduce the requirement of a hightemperature method for graphite purification temperature, creates conditions for industrial production of the high-purity graphite with the carbon content of 99.99% or more, and has a low comprehensive cost, and is suitable for industrial production. and industrialization promotion. The method of the invention has a simple preparation process, low energy consumption, small environmental protectionpressure, and good practical promotion value.

The invention discloses a self-heating deicing system of high-tension transmission lines. The self-heating deicing system is characterized in that the system comprises a high-tension transmission cable and a deicing power module; a transmission cable core and a heating cable core are arranged inside the high-tension transmission cable; the heating cable core is connected with two ends of the transmission cable core through pup joint equalizers; the deicing power module adopts an external direct current power source or a power module directly led out from a high-tension transmission line; and the deicing power module is connected with the transmission cable core and the heating cable core inside the high-tension transmission cable and the pup joint equalizers through a change-over switch to form a heating circuit in the high-tension transmission cable. The self-heating deicing system can realize the deicing operation to the high-tension transmission cable in ice coating sections by building the self-heating deicing circuit in the high-tension transmission cable under the condition of uninterruptible power supply; and moreover, the self-heating deicing system can be matched with the existing high-tension transmission power monitoring system to realize the sectionalized and time-shared deicing to ice coating lines in an automation control manner according to the ice coating situation of lines.

The invention relates to heating control detection equipment and a detection control method of a multistrand insulation self-heating wire. The multistrand insulation self-heating wire comprises a plurality of outer conductors, a protection metal ring, an insulation and heat conduction ring and a plurality of inner side heating rings. The two ends of the wire are connected with a power transmissionline, and the heating control detection equipment with the same structure is arranged at the connecting ends. The heating control detection equipment comprises a voltage measurement module, a variable resistance module, a wire connecting end, a switch, a microprocessor and a wireless communication module. The heating control detection equipment has different control modes according to three different structures of the inner side heating rings. The microprocessor receives a control command from a control center through the wireless communication module; data of the voltage measurement module is transmitted to the control center, and automatic measurement detection of the wire is performed at the same time. According to the equipment and the method, through current of an internal heating structure and the outer conductors is accurately controlled; a voltage difference of the heating configuration is controlled; the insulation requirement of an insulation layer is lowered; and whether the self-heating wire is normal is automatically measured.

The invention discloses a self energy taking device of a high voltage direct current circuit breaker and an implementing method thereof. The self energy taking is composed of a circuit energy taking unit, a high frequency inverter circuit, a high frequency transformer, a magnet ring transformer and a rectifying and voltage-stabilizing circuit connected successively; the implementing method of the self energy taking device includes the steps of: when the circuit energy taking unit is connected into the main branch of the high voltage direct current circuit breaker in series, obtaining energy from the current of the main branch; when current flows through the main branch, controlling the switching-on and switching-off of a switch tube; regulating the charging time of a capacitor to control the voltage range of the capacitor. The self energy taking device provided by the invention utilizes the energy in the circuit without using an additional independent power supply, is applicable to the mechanical switch and power electronic device mixed type direct current circuit breaker, and is lower in insulating requirement of the high frequency transformer with respect to a scheme of supplying power from low potential through the high frequency transformer when being applied to a current limiting device composed of a plurality of direct current circuit breaker connected in series.

The invention relates to a polarity-reversal voltage generator based on a direct current high voltage cascade generation circuit. The polarity-reversal voltage generator solves the problems that the existing polarity-reversal voltage generator cannot generate higher voltage and is higher in cost. After being subjected to voltage regulation by a voltage regulator, single-phase alternating current is input to a boosting transformer to generate high voltage alternating current; the high voltage alternating current is connected with a positive-polarity direct current high voltage cascade generation unit and a negative-polarity direct current high voltage cascade generation unit respectively to generate positive-polarity direct current voltage and negative-polarity direct current voltage; a voltage polarity of a tested article is selected for connection in a manner that a single-pole double-throw switch is selectively connected with an output end of the positive-polarity direct current high voltage cascade generation unit or an output end of the negative-polarity direct current high voltage cascade generation unit; after the voltage polarity is selected, the voltage is connected with one end of the tested article through a protective resistor; and the other end of the tested article is earthed, so that the voltage is applied across the tested article. The polarity-reversal voltage generator is used for a converter transformer.

A ferromagnetic element no-load characteristic low-frequency measuring method mainly comprises the following steps: 1) establishing a high-voltage side open-circuit equivalent circuit according to a T-type equivalent circuit, applying two low-frequency sine waves having different frequencies at the low-voltage side, and calculating iron-core loss under each frequency; 2) calculating unit hysteresis and eddy-current loss We and Wh produced in each period, and calculating iron core loss PCoren when converted to the power frequency; 3) calculating exciting current Iexn, harmonic content K(k) and exciting voltage Un when converted to the power frequency according to an eddy current compensation algorithm; 4) calculating no-load loss Pn; and 5) drawing PCoren-Un, Iexn-Un relation curves and a K(k)-Un harmonic content table. The test is carried out by adopting low-frequency power to replace power frequency power, so that test power source capacity can be reduced by times, the size and weight of the test device are reduced, and the test cost is allowed to be lower.

The invention discloses a high-voltage and large-power wind power generation system and a control method thereof. The high-voltage and large-power wind power generation system comprises a multi-phase permanent-magnet direct-drive wind power generator, 3n three-phase full-control rectification bridges and an H-bridge cascaded multilevel inverter, wherein the multi-phase and large-power permanent-magnet direct-drive wind power generator is provided with 9n phase outputs, n is a positive integer, each three phases form a winding, the 9n phase outputs jointly form 3n windings, each winding is connected with a DC side of each sub-module of the H-bridge cascaded multilevel inverter after being converted by one of the three-phase full-control rectification bridges, and an AC output end of the H-bridge cascade multilevel inverter is connected with a three-phase power grid. The three-phase full-control rectification bridges employ maximum power tracking control to achieve the output of a unit power factor of the wind power generator; and the H-bridge cascaded multilevel inverter is used for achieving high-voltage access, and an AC side is directly connected with a 35kV alternating current. By the high-voltage and large-power wind power generation system, the low-voltage and large-power permanent-magnet direct-drive wind power generation system can be directly connected with a high-voltage power transmission system by a converter, a boost transformer is omitted, and the cost is reduced.

The invention discloses a high-precision, high-field strength and capacitive sensor device for measuring a miniature electric field based on a piezoelectric effect. The sensor device comprises a piezoelectric membrane layer. An upper electrode layer is attached below the piezoelectric membrane layer. The upper electrode layer is supported by a supporting layer. A fixed reference layer is arrangedbelow the upper electrode layer. The fixed reference layer is electrically connected with an impedance detection apparatus. The upper electrode layer is electrically connected with the impedance detection apparatus through an electrode guiding column. The beneficial effect is that: the device has a large electric field measurement range, a high response and sensitivity, and an adjustable linearity; the device can also meet the requirements for monitoring power grid steady state operation and identifying overvoltage fault transient signals except for real-time monitoring large electrical equipment in industrial production.

The invention belongs to power device technique field, as non-contact controllable reactor, which separates the dc control winding and ac operating winding in space, uses the adjustable hollow solenoid, the hollow solenoid with variable dc excitation, and the semi-iron core / circular-iron core straight solenoid with dc excitation as control winding. Wherein, regulating the reactance value by changing magnetic flux, controlling the magnetic saturation degree of semi-iron core, and controlling the rotation direction of magnetic domain of circular-iron core in cross magnetic field, improving the nonlinear character of traditional product, reducing harmonic wave quantity and reactor volume. This invention has wide application in power system.

The invention discloses a hot air type asphalt pavement heating device for thermal regeneration of an old asphalt pavement, which comprises a chassis truck, wherein a hot air generating device is arranged on the chassis truck, and comprises an air heating furnace for heating air to generate hot air, and a bottomless hot air hood is movably arranged below the chassis chuck; a first air outlet holefor conveying the hot air to the ground is formed in the hot air hood, and the air heating furnace supplies the hot air to the first air outlet hole through a hot air conveying pipe; the hot air hoodis peripherally provided with an air shield felt which may be in contact with the ground, and the hot air hood is connected to the air heating furnace through a hot air recovery pipe. The hot air hoodforming a relatively closed space with the pavement is arranged at the bottom of the heating device provided by the invention, and after the hot air generated by the heating device acts on the ground, the hot air can be recovered by the hot air hood, and supplied to the air heating furnace to be reused, thereby effectively improving the utilization efficiency of the hot air and saving energy.

The invention provides a stator stamping and a motor. The stator stamping is provided with an annular yoke and a plurality of teeth, the teeth are outwardly extended from the yoke along the radial direction of the stator stamping, a notch is formed between each two neighboring teeth, moreover, the middle of the stator stamping is provided with an inner round hole, wherein the notches are shallow notches and deep notches, which are arranged alternately, and the opening height of the deep notch is greater than the total height of the shallow notch. The motor is provided with a stator and a rotor, the stator is provided with a stator core made of the laminated stator stampings and coils wound on the stator core, the coils are a plurality of inner coils and a plurality of outer coils, each inner coil is wound between two deep notches, and each outer coil is wound between two shallow notches. The invention can decrease the difficulty of the coil-winding process; moreover, the coils are not overlapped spatially, so that the requirement on the insulation of the coils is decreased, and thereby the production cost of the motor is reduced; moreover, when the motor operates, the magnetic density is more uniform, and operation is more stable.

The invention discloses a vacuum arc-extinguishing-chamber burn-in device of a direct-current superposed high voltage pulse and a method thereof. The device comprises a direct current power supply, a pulse power supply, a vacuum arc-extinguishing chamber, a blocking coupling capacitor and an isolation inductor. One end of the direct current power supply and one end of the pulse power supply are connected to one end of a vacuum arc-extinguishing chamber contact. The other end of the direct current power supply is connected to one end of the isolation inductor. The other end of the pulse power supply is connected to one end of the blocking coupling capacitor. The other end of the blocking coupling capacitor and the other end of the isolation inductor are connected to the other end of the vacuum arc-extinguishing chamber contact. By using the device and the method, technology difficulty is small, cost is low, and simultaneously single burn-in energy can realize accurate adjusting.

The invention provides a magnetic suspension electrode dielectric barrier diffuse discharge plasma generation device comprising a PTFE support. The center of the bottom part of the PTFE support is provided with a magnetic grounding electrode, micropore ceramic and a magnetic suspension electrode which are arranged from the bottom to the top in turn. The center of the top part of the PTFE support is provided with a high voltage electrode and an alumina ceramic barrier dielectric which are arranged from the top to the bottom in turn, wherein a gap is reserved between the magnetic suspension electrode and the alumina ceramic barrier dielectric. The device generates negative diffuse discharge from multiple points to the surface under driving of an AC power supply in working, and the high voltage side becomes a transient cathode so that a large number of active particles can be accumulated. Magnetic iron powder is arranged on the surface of the barrier dielectric, and a large number of triple junction points are manufactured on the surface of the barrier dielectric so as to acquire the diffuse discharge plasmas; and the iron powder can be melted to take away the heat in case of discharge overheat so as to protect the barrier dielectric material. The device can be used as the plasma generation device for the aspect of material surface modification of films and insulators, etc.

The invention relates to a method for realizing the insulation coordination of basic functional units of a voltage source converter (VSC) based on a half bridge circuit, which comprises the following steps of: 1) determining the insulation strength and properties of each component according to the steady-state over-voltage level, transient-state over-voltage level and transient over-voltage level of a sub-module under various operation conditions; 2) making equal the ground potential of a metal shell and a secondary control protection board of primary equipment and the potential of the cathode of the sub-module according to the potential distribution characteristics of the sub-module, and connecting the secondary control protection board and a primary circuit by using an isolation transformer to isolate the influence of the high voltage of the primary circuit on a secondary circuit; 3) shielding the electromagnetic interference of an insulated gate bipolar translator (IGBT) high speed switch in the secondary control protection board by using a metal shielding box according to the electromagnetic field distribution of the sub-module; 4) making equipotential an operating mechanism of a bypass switch and the cathode of the sub-module; and 5) selecting a high voltage wire as a wire crossing a high potential and a low potential to reduce the local discharge capacity of the sub-module. By the insulation coordination method, the insulation requirements of a system can be met, and high security and high economy are achieved.

The invention relates to a voltage droop control method of a DC power grid. The voltage droop control method comprises the steps of: starting with a grid frame structure of the DC power grid, defining a relationship between voltage and current of a convertor station in the DC power grid, transforming typology of the DC power grid, and changing the DC power grid of an arbitrary structure into the one of only a topological structure in radial connection; analyzing flow distribution of the DC power grid, and calculating power variations of subcircuits when voltage of a system fluctuates; and constructing a convertor station voltage droop function according to power variations of the system, so that power of the subcircuits remains unchanged when the voltage of the system fluctuates, thereby achieving the effect of reducing system voltage fluctuations. The voltage droop control method of the DC power grid provided by the invention can stabilize the system voltage quickly, distribute system flow reasonably, and reduce insulating requirement of the system.

A 360-degree quadrature direct power flow controller and a working method thereof are disclosed. That direct power flow controller comprises a three-phase input transformer module, an input selector switch, a single-phase Buck alternating current unit circuit module, a three-phase filter, an output selector switch and a three-phase output transformer module. The input end of the direct power flowcontroller is connected in parallel to the high-voltage power network, and the output end of the direct power flow controller is connected in series to the high-voltage power network. The input selector switch is connected to the primary side or the secondary side of the three-phase input transformer module, and the output selector switch is connected to the primary side or the secondary side of the three-phase output transformer module. The single-phase Buck alternating current unit circuit module comprises an A-phase Buck AC unit circuit, a B-phase Buck AC unit circuit and a C-phase Buck ACunit circuit with the same circuit structure. The controller only comprises a simple Buck alternating current unit circuit, and can control the voltage phase and amplitude of the transmission terminalof the power network at the same time through only one-stage power conversion, can respectively control the active power flow and the reactive power flow in the line, and realizes the adjustment of the phase angle of the output voltage by 360 DEG.

The invention discloses a crossed iron core type controlled reactor, which comprises a main iron core and a control iron core, wherein an alternating current winding is wound on an alternating current post of the main iron core, a direct current winding is wound on a direct current post of the control iron core, and the main iron core and the control iron core share a partial iron core post, so the magnetic flux generated by the direct current winding controls the saturation degree of the partial main iron core, and the magnetic flux generated by the alternating current winding is not linked with the direct current winding, or only partial magnetic flux generated by the alternating current winding is linked with the direct current winding. The crossed iron core type controlled reactor has the advantages that the impedance change speed of the alternating current winding is high, the power consumption is lower, and no mutual induction exists between the alternating current winding and the direct current winding.

The invention provides a DC electric drive device and electric equipment. The DC electric drive device is arranged in the electric equipment and is used for driving the electric equipment. The DC electric drive device comprises a DC motor, a DC power supply, an instruction transmission part, an output sensor, a controller, a driver and a chopper. The DC electric drive device is characterized in that the DC motor is provided with 2j independent armature winding branches, 2j*m commutator bars connected with windings, and 2j independent electric brushes in contact with the commutator bars, wherein each armature winding branch is formed by m windings; the chopper is provided with 2j bridge arm units which correspond to the electric brushes one by one; the DC power supply comprises 2j independent power supply units; each power supply unit is connected with one bridge arm unit and one electric brush in a manner of one-to-one correspondence; the armature winding branches connected with the electric brushes are powered; and j and m are positive integers not smaller than 2.

A vertical double excitation controllable electric reactor comprises an insulation sleeve, an iron core cylinder, an alternating current coil winding and a direct current bias winding. The direct current bias winding is wound inside and outside the iron core cylinder and connected with direct current bias current, and the iron core cylinder is sleeved inside the alternating current coil winding which is connected in series in an alternating current working circuit as a working winding, wherein, the alternating current coil winding and the direct current bias winding are mutually vertical and alternating current and direct current are applied to the alternating current coil winding and the direct current bias winding respectively, and tensor permeability of an electric reactor iron core is changed through the interaction of an alternating current magnetic field and a direct current magnetic field, accordingly, reactance value of the electric reactor is changed. The vertical double excitation controllable electric reactor has the advantages of being small in own harmonics, high in security coefficients, and small in electric reactor size, can be used in high-voltage direct current transmission, and can also be used as a tuning filtering inductor, an reactive power compensation inductor or an arc suppression coil higher harmonic filter in the electric system.