79 results about "Superconducting magnetic energy storage" patented technology

a voltage recovery device is configured to provide real and reactive power to a utility power network at a sufficient level and for a sufficient duration to recover the voltage on the utility power network within a predetermined proportion of the nominal voltage, following a fault condition detected on the utility power network. Moreover, the voltage recovery device reduces the overall transmission losses in a utility power system.

The adaptive superconductive magnetic energy storage (SMES) control method and system control a SMES device connected to a power generation system. A radial basis function neural network (RBFNN) connected to the controller adaptively adjusts gain constants of the controller. A processor executes an improved particle swarm optimization (IPSO) procedure to train the RBFNN from input-output training data created by the IPSO, and thereafter generate starting weights for the neural network. Tests carried out show that the proposed adaptive SMES controller maintains the DC capacitor voltage constant, thus improving the efficiency of wind energy transfer. The power output (reactive and real) of the SMES device improves the voltage profile following large voltage dips and provides added damping to the system.

The invention discloses an energy recycling system and method for a liquid hydrogen fuel cell car. The system comprises a superconducting coil, a superconducting switch, a full-bridge type direct current chopper, a superconducting current lead, a direct current link capacitor, a DC-AC bilateral transducer, a vehicle-mounted motor and a measurement and control system, wherein the superconducting coil is immersed in a liquid hydrogen container, the superconducting switch and the full-bridge type direct current chopper are installed in a low-temperature Duval, and the superconducting current lead, the direct current link capacitor, the DC-AC bilateral transducer, the vehicle-mounted motor and the measurement and control system are arranged in a low-temperature hydrogen pipeline. The superconducting current lead is used for connecting the superconducting coil, the superconducting switch and the full-bridge type direct current chopper. The low-temperature hydrogen pipeline is used for connecting a liquid hydrogen fuel cell, the liquid hydrogen container and the low-temperature Duval. Compared with the prior art, the energy recycling system has the advantages that the superconducting coil is cooled directly through vehicle-mounted liquid hydrogen, the superconducting current lead, the superconducting switch and the full-bridge type direct current chopper are cooled directly through the low-temperature hydrogen produced through gasification of the vehicle-mounted liquid hydrogen, a supermumetal energy storing device is actually used in the liquid hydrogen fuel cell car, the brake energy recycling and reutilizing ratio of the car is improved, and staring time and accelerating time of the car are shortened.

The invention relates to a wind-power-station power output counterbalance system which comprises a wind speed acquisition and conversion circuit, an actual wind-power-station analog module, a differential amplifying circuit, a comparison circuit, a control circuit, a current transformer and a superconducting magnetic energy storage device, wherein the superconducting magnetic energy storage device comprises a chopper, a wave filter and a feedback circuit. The working method of the wind-power-station power output counterbalance system comprises the following steps: (1) converting a wind signal into an electric signal; (2) producing a signal which has the same output variation law as the actual wind power station; (3) processing by the differential amplifying circuit; (4) performing the circuit comparison with the power signal output by the superconducting energy storage device; (5) and controlling the conduction of a triode in the current transformer, and outputting power of the multiple superconducting energy storage devices. The invention has the advantage of storing the electric energy by utilizing the superconducting magnet, thereby greatly enhancing the energy storage density, reducing the energy consumption and realizing the synchronous inhibition on the power output fluctuation of the wind power station.

The invention relates to power systems and automation, in particular to a system and a method for improving FRT (fault ride-though) capability of a DFIG-WT (doubly fed induction generator based wind turbine) on the basis of an SFCL (superconducting fault current limiter) and an SMES (superconducting magnetic energy storage). The system is characterized in the on the basis of the typical DFIG-WT, aresistor type SFCL is mounted on the stator side of the DFIG-WT, and the SMES is mounted on a direct current link of the DFIG-WT through a bidirectional DC / DC converter; the resistor type SFCL is used for limiting stator fault current of the DFIG-WT, improving generator terminal voltage sag of the DFIG-WT and absorbing partial surplus active power in the DFIG-WT; the SMES is used for stabilizingunbalanced power and electromagnetic torque oscillation. According to an FRT method for the DFIG-WT on the basis of the SFCL and the SMES, fault current can be limited under symmetrical faults and asymmetrical faults, voltage change is inhibited, and unbalanced power and electromagnetic torque oscillation are stabilized. Efficient FRT support can be provided for the DFIG-WT during FRT, and transient performance of the DFIG-WT is improved.

The invention discloses a direct current side integrated superconductive energy-storing current source type wind energy converter. A fan (1) in the device is connected with the main shaft of a generator (3) through a gear box (2), the output end of the generator (3) is connected with the input ends of a plurality of parallelly-connected fan side current source type converters (5), and the output ends of the fan side current source type converters are connected with a fan side direct current current-sharing inductor (6); the input end of a power grid side current source type converter (9) is connected with a power grid side direct current current-sharing inductor (8), a superconductive magnet is connected between the fan side direct current current-sharing inductor and the power grid side direct current current-sharing inductor, and the superconductive magnet exchange energy with a power grid (13) through the power grid side direct current current-sharing inductor; the output ends of the plurality of parallelly-connected fan side current source type converters, a grid access inductor (11), a grid access transformer (12) and a power grid (13) are connected in series in turn; and a power grid side filter capacitor (10) is connected with the output end of the power grid side current source type converter and a fan side filter capacitor (4) is connected with the input end of the fan side current source type converter.

The present invention discloses a superconducting magnetic energy storage solar energy power supply scheme applied to railway traction power supply. In a distributed solar energy power supply railway traction power supply system formed by a solar cell module, a superconducting energy storage device and a power transmission device, electric energy stored in the superconducting magnetic energy storage device and generated by renewable energy sources directly supplies traction power for an electric locomotive. According to the invention, electric energy may be generated through solar energy and then is stored without loss through a superconducting magnetic energy storage device, and power is supplied to locomotives along the line through an alternating-current traction power supply system. The whole system provided by the invention may be taken as a distributed generation system and may reliably supply power for electric locomotives with environmental protection.

The invention discloses a spacecraft power system based on superconducting magnetic energy storage and a control method. The spacecraft power system comprises a solar cell array, a power control unit, an energy bi-directional flowing converter, a logic and control unit, and a superconducting coil. The power control unit adjust output voltage of the solar cell array, to generate stable primary bus voltage. A variable acquisition and processing module in the logic and control unit acquires the primary bus voltage and processes the primary bus voltage. After processing, the logic and control unit performs logic determination on obtained variables, and a pulse generation, driving, and protection circuit module generates a corresponding pulse signal according to logic determination result. The pulse signal controls the energy bi-directional flowing converter. The energy bi-directional flowing converter is used to realize a primary bus charging the superconducting coil, the superconducting coil discharging to the primary bus, or a freewheeling function of the superconducting coil. The spacecraft power system solves problems that a conventional space power system cannot supply power for large power pulse loads.

Disclosed a current lead wire of superconducting energy storage magnetic coil, belongs to technique field of the structure of current lead wire in superconducting device. The character comprises: the part near the elevated temperature end uses straight-rod copper current lead wire, while the part near low temperature end use elevated temperature superconduction current lead wire in double helix structure; said straight-rod copper current lead wire arranged on the upper and lower ends of heat conducting table is fixed by two connecters and it is through the heat conducting table, welded with elevated temperature superconducting current lead wire, while the connecter is formed by the adiabatic beryllia block sheathing said straight copper current lead wire and the copper cap nut for fixing the beryllia. The invention can at most increase the heat diffusion path in effective space, to decrease the leakage of heat.

This invention discloses an inverse power supply for analog-controlling instantaneous voltages, in which, PID controller output end is connected with the input of the inverse supply, the output of which is connected with the input of the voltage sensor and the load, its output and a reference volume are connected with the negative and positive input of a subtracter, the output of which is connected with the input of the PID controller and the inverse supply is connected with the DC supply, which has the advantages of quick dynamic response, low rate of general harmonic aberration and accurate stability under non-linear load.

The invention provides a supporting device of an annular superconducting magnet and belongs to superconducting double-cake supporting devices of superconducting magnetic energy storing devices. The supporting device of the annular superconducting magnet solves the problem that huge electromagnetic force exerted on superconducting magnets has the negative effect on a magnet system in an existing superconducting magnetic energy storing device. The annular device of the annular superconducting magnet comprises N superconducting magnet clamping assemblies. Each superconducting magnet clamping assembly is composed of an inner supporting ring, an outer fixing plate, a left cover plate and a right cover plate. The superconducting magnet clamping assemblies are evenly and vertically placed between an upper end cover and a lower end cover along the circumference in a radial mode. The upper end cover and the lower end cover are connected and fixed with each other through long screws. In the work state, each superconducting double-cake inner ring side is supported by an inner supporting ring, and the two sides of each superconducting double-cake are fastened through one left cover plate and one right cover plate. The upper end and the lower end of each superconducting double-cake are fixed through one outer fixing plate, and therefore a modular magnet work assembly is formed. A plurality of magnet work assemblies are evenly and vertically placed between the upper end cover and the lower end cover along the circumference in the radial mode, annular supporting and fixing are conducted, and the mechanical stability and the operational stability of the annular superconducting magnet are improved.

Disclosed herein is a coil bobbin for a superconducting magnetic energy storage. The coil bobbin includes coil bobbin frames, superconducting coils, first support plates, second support plates and a center frame. The coil bobbin frames are provided in such a way as to face each other. The superconducting coils are wound around the respective coil bobbin frames. The first support plates are provided on surfaces of the respective coil bobbin frames that are on faces that are opposite to the surfaces between the coil bobbin frames that face each other. The second support plates are provided on the respective facing surfaces of the coil bobbin frames. The center frame is disposed between the second support plates and has an annular plate shape having a thickness that is gradually reduced towards a center of the toroidal arrangement.

An isolated superconducting magnetic energy storage system quench detection device disclosed by the present invention comprises a signal acquisition part and a signal processing part separated from and electrically connected with the signal acquisition part, and is characterized in that the signal acquisition part comprises a Hall element, and the signal processing part comprises a compensating circuit, a signal amplifying circuit and a voltage measurement device which are connected orderly; the Hall element is electrically connected with the compensating circuit, and the signal amplifying circuit is also connected with a no-voltage zero setting circuit. The isolated superconducting magnetic energy storage system quench detection device also comprises a DC power supply module for supplying power to the modules. The isolated superconducting magnetic energy storage system quench detection device of the present invention can realize the rapid, convenient and accurate quench detection, can detect the quench indexes directly, can determine the quenching by detecting the magnetic induction intensity of an energy storage device directly, can accurately detect the quenching on the condition of not having other strong-magnetic field objects, and is not interfered easily. Meanwhile, when a magnetic energy storage system quenches, the magnetic field fluctuation is large, the criterions are obvious, and the anti-interference performance is also enhanced.

The invention discloses a low voltage crossing scheme of a double-fed fan based on superconducting magnetic energy storage and improved control, comprising a superconducting magnetic energy storage device and a control strategy matching with the superconducting magnetic energy storage device. A super-conduction magnetic energy storage device comprises a super-conduction coil, a DC-DC Converter, aCapacitor and a Voltage Source Inverter. The superconducting coil is connected in parallel to the rotor side of the doubly-fed induction motor through a DC-DC converter, a superconducting magnetic energy storage side inverter and a filter inductor. and the control strategies include transient voltage control and current backtracking control. In that event of power grid voltage failure, After failure, At that same time, the rotor-side invert and the inverter of the superconduction magnetic energy storage device are switched to the current reverse tracking control and the transient voltage control, Each inverter shares 50% of the rotor overcurrent to ensure that the reactive current is injected into the rotor side by transient voltage control while each inverter does not exceed the current,so that the stator side emits reactive current to support the grid voltage, thereby improving the low voltage ride-through capability of the fan.

The invention discloses a mobile high temperature superconducting magnetic energy storage device, which comprises a monitoring subsystem, a power adjusting subsystem, a superconducting magnet and a low temperature subsystem which are integrated in a mobile box body, wherein the monitoring subsystem is used for acquiring and recording real-time states of a power system and the high temperature superconducting magnetic energy storage device and sending a control instruction to the power adjusting subsystem; the alternating current side of the power adjusting subsystem is connected with the power system, and the power adjusting subsystem implements power exchange between the superconducting magnet and the power system according to the instruction sent by the monitoring subsystem; the superconducting magnet is sealed in a Dewar, and two ends of the magnet are connected with the direct current side of a current transformer of the power adjusting subsystem through current leads; and the lowtemperature subsystem is connected with the Dewar and used for vacuumizing the Dewar so that the magnet is kept cool in a working temperature area. Transient stability of the power system is improvedby compensating the power unbalance of the power system in real time, meanwhile, the device has mobility, and an installation site can be flexibly selected.

The invention discloses an instantaneous voltage and current dual-loop digital control inverted power supply. The output end of a current controller is connected with the control end of an inverter; the output end of the inverter is connected with the input end of a voltage transducer and a load; the output end of the voltage transducer is connected with a negative input end of a first subtracter; the positive input end of the first subtracter receives reference quantity; the output end of the first substracter is connected with the input end of a voltage controller; the direct current end of the inverter is connected with a direct current power supply; the current led out from the inverter is connected with the input end of a current transducer; the input end of the current transducer is connected with the negative input end of a second substracter; the positive input end of the second transducer is connected with the output end of the voltage controller; and the output end of the second substracter is connected with the current controller. The inverted power supply is quick in response, small in error, and small in wave distortion of output voltage under nonlinear load condition. The inverted power supply is widely applied to alternating stabilized power supplies, uninterruptible power supplies, flexible alternating current input systems, superconducting magnetic energy storage systems, and renewable energy resource power supply systems.

This invention relates to a pulse forming device for high temperature super-conductive magnets, in which, this invented charge circuit is connected with a super-conductive magnet storage body, a control circuit and a protection circuit orderly and connected with a super-conductive pulse transformer electrically, the storage magnetic body is composed of N energy storage modules in a low temperature Dewar, the control circuit drives the energy storage modules to operate closely and separately and the super-conduction transformer in the low temperature Dewar discharges to the load to form large current pulse waves, the protection circuit provides over-voltage protection to the energy storage magnetic body and the transformer.

A superconducting magnetic energy storage (SMES) device including a first coil made of superconducting material, a cooling mechanism for cooling the first coil to superconducting temperatures, a second coil inductively coupled to the first coil for inputting emergy to, and / or outputting energy from, the first coil, and a switch for switching the first coil between a superconducting condition and a non-superconducting condition. The first coil is arranged as a closed loop electric circuit having no connecting device mechanically connected to it for inputting or outputting energy. The switch includes a third coil for the application or removal of a magnetic field for switching the first coil between its non-superconducting and superconducting conditions. A method inputs energy to and / or outputs energy from the first coil and a power supply system utilizes the device and method.

A loss can be reduced upon a current holding operation of a SMES. A superconducting magnetic energy storage (SMES) system includes a loop composed of a superconducting coil, a thyristor, and a synchronous rectification circuit, and a loop current flow through the loop. In a loop current hold mode, a switching control device of the synchronous rectification circuit turns on the thyristor, and the synchronous rectification circuit compensates for the loop current by rectifying an AC current from an AC power source to generate a DC current.

The invention relates to a wind, light and superconducting magnetic energy storage hybrid power generation system based on current-source inverters. The wind, light and superconducting magnetic energy storage hybrid power generation system comprises a fan 6, a motor-side current-source inverter 5 connected with the fan 6, a photovoltaic (PV) cell panel 9, a unidirectional power booster converter 8, a voltage / current converter 7, a first superconducting magnetic coil 3, a second superconducting magnetic coil 4, a current-source grid-connected inverter 2 and a grid-connected inductor 1. The direct current (DC) side of a motor-side converter of a wind power generation system, the DC side of a PV-side converter of a PV power generation system and superconducting magnetic-energy-storage superconducting magnetic coils are in series connection together and share the current-source grid-connected inverter at a grid side. A superconducting magnetic energy storage system, the wind power generation system and the PV system are effectively integrated at the DC side, the superconducting magnetic coil at the DC side can store energy, the unstable output power of wind power generation and PV power generation caused by natural conditions can be smoothened, and the wind, light and superconducting magnetic energy storage hybrid power generation system based on the current-source inverters has a good current-limiting function when an electric grid is subjected to short-circuit fault.

The invention discloses a method for suppressing sub-synchronous oscillation of a wind power transmission system through series compensation by a superconducting magnetic energy storage and a controlsystem for suppressing sub-synchronous oscillation of a wind power transmission system through series compensation by a superconducting magnetic energy storage. The method comprises the steps of: thestep A, monitoring a bus power condition at the exit of a wind power plant in real time; the step B, if the control system determines the generation of sub-synchronous oscillation, starting an activeouter ring additional damping controller of a superconducting magnetic energy storage controller; the step C, observing the change state of the sub-synchronous oscillation, and if the convergence rateof the sub-synchronous oscillation does not reach a preset standard, starting a reactive outer ring additional damping controller of the superconducting magnetic energy storage controller; and the step D, when a sub-synchronous component of the power of the wind power plant in the system is smaller than an assigned value, quitting the outer ring additional damping controllers of the superconducting magnetic energy storage controller. Based on the sub-synchronous oscillation suppression method and the control system, on the basic function of the superconducting magnetic energy storage, the flexible and changeable operation conditions of the wind power plant can be adapted so as to effectively suppress the sub-synchronous oscillation of the wind power plant.

The invention relates to a superconducting magnetic energy storage-storage battery-based transient-stability control method of a microgrid. The superconducting magnetic energy storage-storage battery-based transient-stability control method is characterized by comprising the steps of 1) installing a superconducting magnetic energy storage-storage battery hybrid energy storage device at a public coupling point of the microgrid and a main power grid by a DC / AC inverter and a DC / DC converter; 2) employing a superconducting magnetic energy storage (SMES)-storage battery coordination method duringinternal fault processing; 3) employing an SMES-storage battery coordination method during external fault processing; and 4) combining the SMES-storage battery coordination methods during internal fault processing and external fault processing to form an SMES-storage battery coordination control method during processing different faults. By combining the complementary technical characteristics ofSMES and storage battery energy storage, remarkable effects on aspects of reducing power fluctuation, reducing a fault current, compensating voltage sag, preventing frequency fluctuation and the likeunder different faults are achieved, and generally, the SMES-storage battery transient-stability control method has remarkable effect of improving transient stability of the microgrid.

The invention discloses a DC / DC chopper suitable for superconducting magnetic energy storage, comprising a first chopper, a second chopper, and a DC capacitor connecting the first chopper and the second chopper. The first chopper is characterized in that a first IGBT and a second IGBT are connected in series, a first diode and a second diode are respectively connected in parallel across the collector and the emitter of the first IGBT and the second IGBT, one end of a filter inductor is connected with the collector of the second IGBT and the other end to the positive of the DC capacitor, and the emitter of the second IGBT is connected to the negative of the DC capacitor. The second chopper is characterized in that a third IGBT is connected in series with a fourth diode, the third IGBT and the fourth diode are connected in parallel across the DC capacitor, a fourth IGBT and a third diode are connected in series and then connected in parallel across the DC capacitor, one end of a superconducting energy storage inductor is connected to the emitter of the third IGBT, and the other end is connected to the collector of the fourth IGBT. The DC / DC chopper can eliminate the high-frequency PWM pulse voltage of the superconductive energy storage inductor and improve the stability of the superconducting magnetic energy storage.

The invention relates to a method for controlling SMES (superconductor magnetic energy storage) based on an LESO (linear extended state observer). The device comprises a wind farm, wherein the wind farm comprises an SMES superconductive coil. The device is characterized by also comprising a signal conditioning module, a signal driving module, a DSP (digital signal processor) control module, a converter monitoring module and a converter module. A control method comprises the following steps of collecting a signal of the wind farm; filtering and conditioning; performing DSP controlling and processing, and building an LADRC (linear active disturbance rejection controller); outputting power; controlling the SEMS superconductive coil. The device and the method have the advantages that the robustness and suitability are high, the structure is simple, and the implementation is easy.

Output power of wind power generation and photovoltaic power generation has volatility and randomness, the grid-connection technical requirements are high, the cost is high and the utilization rate is relatively low. According to the research, wind power generation and photovoltaic power generation both have certain complimentarity on time and space, so that development of a complementary hybrid wind / photovoltaic power generation system (HPW) becomes more and more important; the complementary hybrid wind / photovoltaic power generation system shares an energy storage device and a universal inverter, so that the use cost of a power generation system is reduced. A novel hybrid energy storage system is disclosed by utilizing complementarity, in energy storage principle, of superconducting magnetic energy storage (SMES) and a storage battery(BESS), so that the energy storage system has advantages such as high power density, high energy density, a long service life and the like, meanwhile, a self-adaptive fuzzy control algorithm is adopted to further control the on and off of the hybrid energy storage system, thereby realizing fast stabilizing of output power fluctuation of the wind-photovoltaic complementary power generation system, reducing times of charging and discharging the storage battery, prolonging the service life and further improving the economic performance and technical performance of the whole system.

Disclosed is a superconducting magnetic energy storage voltage control method based on internal model robust control, wherein in the voltage control method, a difference value obtained by comparing areference voltage signal in an alpha beta coordinate system and an actual voltage signal is used as an input signal of an internal model robust controller, and the reference voltage signal in the alpha beta coordinate system is used as an input signal of a feed forward compensator; then output signals are added through the internal model robust controller and the feed forward compensator, alpha beta-ABC inverse coordinate transformation is performed, and a superconducting magnetic energy storage inverter control input command is obtained through PWM. In the control method, the internal model control can improve the harmonic suppression capability of a superconducting magnetic energy storage output voltage and the robust control can improve the interference resistance of the superconductingmagnetic energy storage output voltage so that a system using the voltage control method has higher robust stability and better dynamic tracking property when coping with sudden load increase.

This invention relates to a super-conductive current control technology for the current flows through a super-conduction coil when storing energies characterizing that this invention converts a power supply three phase voltage, a load three-phone voltage to ordered stable control current on the d, q shaft by a DSP chip, then converts the ordered current to six control pulses by a current vector pulse width regulator to send them to the grids of transistors in a current transformer composed of correspondingly serial connected six insulation grating bi-polar transistors and six diodes, the input of the current transformer is three-phase load voltage added on three central points of three arms, the output is the super-conduction current flowing through the super-conduction coil connected between the negatives of the three diodes at the end of the three arms and the source of the bi-polar transistor at the start end.

This invention discloses a digit controlled inversion supply and its control method, in which, the output of an augmented state feedback digit controller is connected with the input of an inverter, the output of which is connected with the input of a voltage sensor and a load, the first output end of the voltage sensor is connected with the negative input of a subtracter, the positive input of which receives reference volume ur, the output of which is connected with the input of a controller, the inverter is connected DC supply, the current led out from the inverter is connected with the input of the current sensor, the output of which and a second output of the voltage sensor are connected with the negative input of the controller constituting a microprocessor with the subtracter.