109 results about "Thyristor controlled reactor" patented technology

A method for compensating dynamic three-phase unbalanced loadsand and its device characterizing in sampling values of line voltage and load line current of two sample points at the connecting place of the compensation device and the system to compute related sine signal basic wave symmetric component, then to calculate positive and negative sequential compensator threephase equal susceptance, thesum of which is the three-phase susceptance value for compensating load unbalance and providing reactive current for the load, the susceptance reference value to be converted to a control angle signal and an order of the thyristor switched capacitor to be sent to the pulse generation plate and the condenser zero-cross trigger plate for controlling two devices.

The invention discloses an electric energy quality compound control system for an electric distribution network. The system comprises an industrial computer, a DSP control board, a transformer decision terminal and an SVC device which is hung on the electric distribution network, wherein, the DSP control board accessed to the SVC device is connected with the electric distribution network by a voltage transformator and a current transformator; the SVC device and the transformer decision terminal are both connected with the industrial computer by the DSP control board; the high-voltage static var compensator (SVC) consists of an MSC (mechanical switching capacitor bank) connected in star and a TCR (thyristor control reactor) connected triangularly. The invention also discloses a novel electric energy quality compound controlling method for the electric distribution network corresponding to the control system, so as to effectively compensate system reactive power, improve power factor and overall level of the electric energy quality of the electric distribution network, thereby having great importance and engineering application value for comprehensive management to the electric distribution network such as energy conservation and consumption reduction.

The invention discloses a system for compensating the combined negative sequence current of a power regulator and a static var compensator. The system consists of a railway power regulator and the static var compensator. The railway power regulator is installed between two power supplying arms at a secondary side of a traction transformer by two single-phase three-winding reducing transformer. Thestatic var compensator consists of two groups of thyristor switched capacitors which are connected in parallel and a group of thyristor controlled reactors. The thyristor switched capacitors and thethyristor controlled reactors are respectively connected with two traction power supplying arms by single-phase three-winding reducing transformers, wherein the thyristor switched capacitors are installed below the single-phase three-winding reducing transformer which is connected with the power supplying arms with relatively advanced voltage phases, and the thyristor controlled reactors are installed below the single-phase three-winding reducing transformer of the power supplying arms with relatively hysteretic voltage phases. The system can maximally reduce the capacity of the railway powerregulator while also satisfying the requirement of a railway system on the unbalancedness degree of three phase current.

The invention discloses a control method for large wind field reactive-load compensation equipment in low voltage ride through. The control method comprises the follow steps that firstly, information of voltage, current, power and frequency in a power grid is sampled through coordination control of an automatic voltage control system, fault points are detected, and when draught fan low voltage ride through starts, a static var generator is rapidly started to provide reactive power; secondly, compensation capacity of various types of reactive-load compensation equipment is determined according to different installation places and effects of the reactive-load compensation equipment and different principles; thirdly, the static var generator respectively achieves the reactive compensation work state and the harmonic suppression work state by using different control strategies; fourthly, the automatic voltage control system starts a thyristor switched capacitor when power voltage is equal to pre-charged voltage of the thyristor switched capacitor; fifthly, the automatic voltage control system starts a thyristor controlled reactor according to reactive gap information; the fourth step and the fifth step are in parallel with each other.

The invention relates to a harmonic-var comprehensive compensation system based on two-way dynamic reactive power compensation devices. The system consists of a mechanically switched capacitor MSC, a static var generator SVG and an active power filter APF which are connected with a power network 1. The system uses the SVG to replace a thyristor controlled reactor TCR in the prior harmonic-var comprehensive compensation system, and as the SVG generates reactive power through electric-energy transformation to perform var compensation, the SVG does not need large-capacity reactors, capacitors and other energy storage elements. Therefore, the capacity of the MSC and the SVG is reduced by half at least; system volume is effectively reduced; and system cost is lowered. Meanwhile, as the SVG uses a full-controlled switching device IGBT, the SVG is fast in response and has the system response time which is less than 20 ms and much superior to that of the TCR. In addition, as the SVG does not produce harmonic current, the capacity of the APF is reduced, thus the volume and cost of the system are further reduced.

The present invention discloses a nonlinear PI voltage control method of a static reactive compensator, which includes the following steps: detecting and sampling the compensation current Isvc output by the static reactive compensator and calculating the compensation voltage VsL, sampling meansquare value Vrms of the power network voltage; calculating the difference value delta V between the voltage set value Vref and the compensation voltage VsL and system voltage Vrms; getting the control guide signal Bmsc and Btcr of mechanical threw cut capacitor and thyristor control reactor after the difference value delta V passes through an optimal nonlinear PI controller; getting logical pwl signal and angle control signal from the control guide signal Bmsc and Btcr; and sending the logical pwl signal and angle control signal to a trigger circuit and controlling the input amount of the reactor and the capacitor by the static reactive compensator. The present invention controls the static reactive compensator voltage by nonlinear PI. The responsive speed of the nonlinear PI distinctly outperforms the responsive speed of the prior PI, thereby solving the problem of overshoot of controlled variable and realizing fast and non-overshoot traction of voltage set value of SVC system with good active and static performance.

The present invention discloses a harmonic dynamic treating and reactive dynamic compensation composite control method and the realizing device, wherein, the realizing device comprises a main device and a control device. The main device comprises a HAPF, a SVC which is composed of a mechanical switching capacitor set that is Y-shape connected and a thyristor control reactor that is delta connected. The control device comprises a voltage and current mutual inductor which are accessed into the sampling module, and a DSP controller, an industrial controlling device, a communication module, a MSC logic control circuit, a RCR admittance-angle calculating module, a PWM signal generating module, and light end transmitter, a light end receiver, and MSC, TCR and HAPF which are lastly accessed into the main device with the insulating and power amplifying circuit. The invention executes dynamic coordination control to the hybrid active electric power wave filter and static reactive compensator, has excellent dynamic and static properties and robustness, and better adaptability.

A hybrid-STATCOM for providing compensating reactive power required by a load, the hybrid-STATCOM comprising: a TCLC part for each electric power phase, each TCLC part comprising: a coupling inductor; a power filter capacitor; and a thyristor-controlled reactor connected in series with a power filter inductor; and an active inverter part comprising: a voltage source inverter for each electric power phase; and a DC-link capacitor connected in parallel with the voltage source inverters. The control strategy of the hybrid-STATCOM is separated into two parts: TCLC part control and Active inverter part control. The TCLC part control is based on the instantaneous pq theory and aims to compensate the loading reactive power with the controllable TCLC part impedance. The active inverter part control is based on the instantaneous active and reactive current id-iq method and aims to improve the overall performance of the hybrid-STATCOM under different voltage and current conditions.

The invention discloses an integrated governance device for electric energy quality. The integrated governance device comprises a static var generator and a static var compensator; the static var compensator comprises a fixed compensator and a thyristor control electric reactor; the static var generator, the fixed compensator and the thyristor control electric reactor are connected on a power grid between an electric network source and a load in parallel; each static var generator comprises one or more than two H-bridge units connected in series; direct current support capacitors are connected to two ends of the H-bridge units in parallel; each fixed compensator comprises a capacitor and an electric reactor which are connected in series; each phase of thyristor control electric reactor comprises a phase-control reactor and a controllable valve body composed of one or more than two reverse parallel thyristors connected in series, and the controllable valve body is connected with the phase-control reactor in series. The device not only can compensate as to idle work, but also can achieve the compensation of a harmonic wave and a negative sequence. Meanwhile, the idle work and harmonic wave are continuously and adjustably compensated at the high-voltage side, and no transformer is led, so that the compensation speed is fast.

The invention discloses an SVC composite control method based on rapid equivalent susceptance calculation, wherein, an SVC comprises a thyristor controlled reactor (TCR) and a passive filter bank. The SVC composite control method comprises the following steps: firstly, calculating the corresponding equivalent susceptance by using an equivalent susceptance computing method after detecting a voltage signal and a current signal; adding up an open-loop equivalent susceptance output value BLabc and a closed-loop PI regulator output value to obtain a total equivalent susceptance compensation value BTabc; calculating the actual input group number n of PPFs and the actual equivalent susceptance value of the TCR by a power divider according to the compensation value; and searching an Hash table by the TCR according to the actual equivalent susceptance value to obtain a corresponding triggering angle and then triggering opening of a corresponding thyristor to send out corresponding inductive reactive current for compensating capacitive reactive power and negative-sequence current, and finally realizing complete compensation of the reactive power and the negative-sequence current of a system. The SVC composite control method effectively reduces the calculated quantity of the system and improves the response time of the system.

The invention discloses a harmonic wave and idle dynamic management controller suitable for a high pressure system and a control method. The harmonic wave and idle dynamic management controller suitable for the high pressure system comprises an industrial personal computer (IPC), a signal detecting and processing circuit, a resonance hybrid injection active power filter, a thyristor controlled reactor(TCR) and a mechanical switched capacitor, wherein the resonance hybrid injection active power filter is used for managing power grid harmonic current, and the TCR and the mechanical switched capacitor are used for realizing real-time dynamic reactive powder compensation. The invention can realize dynamic real-time management and compensation for the power grid harmonic current and the power grid inductive or capacitive reactive power, improves the tracking control accuracy of the active power filter, enhances reactive compensation performance of an SVC, realizes real-time dynamic reactive power compensation and management on the power grid harmonic current, and simultaneously and preferably ensures the stability of the system.

The invention relates to a control device of an electric system static var compensator (SVC), in particular to a double SVC coordination control device. The control device comprises a measuring unit, a voltage adjustor, a distributing unit, a synchronizing system, a protecting unit, an on-off input unit, an on-off output unit and a valve base electronic unit; the measuring unit is respectively connected with the voltage adjustor and the protecting unit, the voltage adjustor is connected with the distributing unit, the protecting unit is respectively connected with the distributing unit and the on-off output unit, the distributing unit is respectively connected with the on-off input unit, the on-off output unit and the valve base electronic unit, and the valve base electronic unit is connected with the synchronizing system and a thyristor control reactor (TCR). Double SVC coordination control is achieved by the adoption of one control system, TCR coordination control and gain optimization under two main transformers in the same transformer substation are achieved, and circulating switching and capacitive reactance interlocking logic of multi-group parallel-connection capacitive circuit branches or sensitive circuit branches under all sections of buses are achieved.

The invention relates to a method and a device for improving supply voltage at the tail end of a long supply arm of a heavy haul railway. The method is characterized in that: a direct hanging thyristor controlled reactor (TCR)-type static var compensator (SVC) is arranged at the outlet end of a Scott main transformer; a plurality of groups of step-down thyristor switched capacitors (TSCs) are arranged at an autotransformer (AT) end at the tail end of the long supply arm at the same time; and the tail end of the supply arm is compensated by using a step-down TSC grouping mode so as to improve the supply voltage at the tail end. The Scott transformer is arranged in a power supply system of the AT of the heavy haul railway and is provided with a T seat outlet end and an M seat outlet end; the T seat and M seat outlet ends of the Scott transformer are provided with a set of SVC devices consisting of a TCR branch and two fixed capacitor branches FC1 and FC2, wherein FC1 is identical to the FC2, so that the whole SVC can be subjected to derating compensation when the set of devices are maintained; and simultaneously, the step-down TSC groups are arranged in uplink, respectively set as three-time and five-time filter branches, wherein the uplink is a heavy climbing line, and downlink is a descending line.

The invention discloses a method for controlling a power electronic hybrid system. The method comprises a power electronic hybrid control system comprising an active power filter and a static var compensator, wherein the static var compensator comprises a passive power filter group and a thyristor control reactor (TCR); and the active power filter, the passive power filter group and the TCR access between a power grid and loads connected with the power grid in sequence. The passive power filter and the active power filter are used jointly to perform harmonic suppression on high-voltage busbars; and the static var compensator is used to perform reactive compensation, so that delay compensation and online control are realized, control accuracy is enhanced, tracking performance is improved, electric energy loss of the power grid is reduced, and pollution of the power grid is purified.

The invention discloses a comprehensive negative sequence and harmonic compensating system of electrified high-speed railway. The compensating system consists of a back-to-back type railway power regulator, two groups of thyristor controlled high-pass filters with different parameters and two groups of thyristor controlled reactors with different parameters in a combination way. The railway power regulator is connected with two power supplying arms at a secondary side of a three-phase V / V wiring traction transformer by two single-phase three-winding reducing transformer. The two groups of thyristor controlled high-pass filters are installed below the single-phase three-winding reducing transformer which is connected with the power supplying arm with relatively advanced voltage phase, and the two groups of thyristor controlled reactors are installed below the single-phase three-winding reducing transformer which is connected with the other power supplying arm with relatively hysteretic voltage phase. Compared with other compensating structures, the compensating system has the advantages of negative sequence and harmonic compensating effect improvement and active device capacity reduction, thus having good industrial application prospect.

The invention relates to a hybrid excitation triggered double exciting winding MCR (magnetically controlled reactor). The MCR comprises two iron cores, wherein two groups of coils wind each iron core; the four groups of coils intersect and are connected with each other in parallel; taps are led out from the middle of a group of coils on each iron core; and controllable devices are connected between the taps and the other group of coils winding the iron core. The MCR is characterized in that another group of coils is compounded on each iron core; and the two groups of coils are reversely connected with each other in series and form a loop with a rectifier bridge circuit formed by two controllable devices reversely connected with each other in parallel. The MCR has the following beneficial effects: quick excitation and demagnetization can be realized and the tap voltage is unnecessary to be improved; the ultrahigh voltage quick dynamic reactive compensation device for flexible power transmission and distribution becomes reality by utilizing the device; the MCR device can be applied to the ultrahigh voltage quick fluctuation sites; the MCR can replace the traditional TCR (thyristor controlled reactor) static compensation devices; and the MCR device can ensure the arc suppression coil in quick response to be applied in the power system.

The invention relates to a three-phase static var compensator (SVC) device for an electrified railway traction side. The device comprises an SVC having a three-phase structure which is connected in a delta connection mode, wherein each phase comprises a thyristor controlled reactor subcircuit and a fixed capacity subcircuit which are connected in parallel; a power supply arm for the device comprises power supply arms a and b; tree phases of the SVC is connected between a and c (the power supply arm a and a steel rail c), between b and c (the power supply arm b and the steel rail c) and between a and b (the power supply arm a and the power supply arm b); and the device is connected to a low-voltage side of a traction transformer. The device can comprehensively realize functions of supporting power supply arm voltage, controlling a power factor, suppressing harmonic waves and compensating a negative sequence on electrified railway load; and the defect that a single-phase SVC on a traction side cannot compensate negative-sequence current can be overcome, a step-up transformer for an SVC on a power grid side can be saved, and the device is a three-phase SVC device which integrates advantages of the SVC on the traction side and the SVC on the power grid side.

The invention discloses an energy acquiring and electromagnetic triggering system of a high-voltage thyristor valve bank. The system comprises a pulse current source device for generating power pulse current, a BUCK stable voltage transformation device for supplying a stable direct-current voltage to a pulse current source, an isolating transformation device for isolating the pulse current generated by the pulse current source, a straight through current transformer for transforming the pulse current isolated and output by the isolating transformation device and an electromagnetic triggering device for triggering the thyristor controlled reactor (TCR) thyristor valve bank by using the output signal of the straight through current transformer. The system realizes combination of energy acquiring and triggering functions, reduces the requirement for the isolated voltage of the current transformer, is suitable for triggering control of the TCR thyristor valve bank of 35KV and higher voltage level, and is mainly applied to reactive power compensation of power grids and certain industrial users with impact loads.

The invention provides a reconstruction configuration method of a valve bank of a thyristor control reactor (TCR) and two six-pulsating parallel rectifying valve banks; the valve bank of the thyristor control reactor (TCR) and two six-pulsating parallel rectifying valve banks are composed of twelve valve banks, and each valve bank is a thyristor series structure, and the different number of thyristors are connected in series for being suitable for different voltage class, and different topological structures are formed by splitting, combination and reconstruction; the topological structures can respectively form the valve bank of the thyristor control reactor (TCR) and two six-pulsating parallel rectifying valve banks and can be flexibly applied to static-state reactive power compensation SVC and rectification. The method carries out splitting and reconstruction to the valve bank of the thyristor control reactor (TCR) and two six-pulsating parallel rectifying valve banks for forming the different topological structures; in normal time, SVC is formed for reactive power compensation, system voltage regulation and stable control, and in disaster climate, a rectifying system is formed for direct current de-icing, thus having remarkable economical efficiency.

The invention discloses a combined compensation system of an injection-type hybrid active power filter and a static var compensator. The combined compensation system is composed of the injection-type hybrid active power filter and the static var compensator, wherein, the injection-type hybrid active power filter is composed of an uncontrollable rectifier bridge, an inverter, an output filter reactor, a coupling transformer, an injection branch and a high-pass filter, a first capacitor (C1) and a first inductor (L1) in the injection branch form a first harmonic resonance circuit, and forms a triple resonance injection branch with an injection capacitor (C[F]), and a second capacitor (C[G]), a second inductor (L[G]) and a resistor (R[G]) form a second order damped high-pass filter; the static var compensator is a thyristor controlled reactor; and an output terminal of the injection capacitor (C[F]) is connected with the high-pass filter, the static var compensator and electric grids. In the combined compensation system, one compensation system is respectively arranged at two feeding sections of an electric traction system, which can realize comprehensive control on reactive, harmonics and negative sequence compensation in electric railways.

The invention discloses a hybrid compensation system for negative-sequence current in a high speed railway. The hybrid compensation system comprises a railway power regulator, two single-phase three-winding step-down transformers, m groups of thyristor switched capacitors of the same parameter, and a group of thyristor controlled reactors. The railway power regulator is connected with low-voltage sides of the two single-phase three-winding step-down transformers by virtue of joint inductance; high-voltage sides of the two single-phase three-winding step-down transformers are connected with two single-phase power supply arms of a secondary side of a three-phase Vv traction transformer; the m groups of thyristor switched capacitors of the same parameter are arranged on the low-voltage sides of the single-phase three-winding step-down transformers connected with a voltage phase advance power supply arm; and the group of thyristor controlled reactors are arranged on the low-voltage sides of the single-phase three-winding step-down transformers connected with a voltage phase lag power supply arm. According to the hybrid compensation system, the negative-sequence current can be effectively compensated, the power of an active compensation device can be reduced, and the cost is reduced. Therefore, the hybrid compensation system has good development prospects in the field of negative-sequence compensation of the high speed railway.

The invention discloses a harmonic and reactive dynamic comprehensive compensation system which is based on APF and SVC, comprising an independent resonance injection active power filter APF, a thyristor controlled reactor TCR and a mechanically switched capacitor MSC. The thyristor controlled reactor TCR is arranged beside a power network; the mechanically switched capacitor MSC is arranged beside a load; the independent injection active power filter APF is arranged between the TCR and the MSC; meanwhile, a frequency-dividing and phase-separating method which is applicable to the comprehensive compensation system is disclosed. The system of the invention can implement dynamic real-time tracking compensation treatment for power network harmonic current and reactive power; the current control method which is adaptable for the system overcomes the shortage of great coupling between the APF and the TCR when a traditional ipiq method is adopted, greatly reduces the interplaying of the control performances between the TCR and the APF, thus improving the reliability and control precision of the system.

The invention belongs to the technical field of automatic control of a power system, in particular to a scattered power generation reactive compensation device and method with the harmonic suppression function. The scattered power generation reactive compensation device comprises an A-T mixing reactive compensation unit, a central control unit and a power supply module. The A-T mixing reactive compensation unit comprises a thyristor control reactor set (TCR), an active power filter (APF) and a passive filter set, wherein the thyristor control reactor set is connected with a compensation access point between the passive filter set and a power grid main line, and the active power filter and the passive filter set are in serial connection to form a mixing active filter. The central control unit can output pulse width modulation signals and triggering pulse signals which can respectively trigger an APF thyristor and a thyristor in the thyristor control reactor set. The scattered power generation reactive compensation device and method with the harmonic suppression function can effectively restrain resonance between the passive filter and the power grid, enables harmonic compensation accuracy to be higher and system response to be quick, improves reactive compensation safety and is economical and practical.

The invention discloses a control device and a method for controlling chaos based on reactive compensation, which comprises a high potential plate and a thyristor controlled reactor, and further comprises a central processing unit, a reactive compensation unit, a chaos control unit, a power source and a communication module; wherein the central processing unit comprises a sampling module, a preprocessing module, a detection single chip microcomputer, a memory module and a comprehensive treatment single chip microcomputer; the reactive compensation unit comprises a reactive compensation processor, a reactive compensation controller and a feedback sampling module I; the chaos control unit comprises a chaos control processor, a chaos control controller and a feedback sampling module II. The method includes: collecting three phase phase voltage instantaneous values and three phase line current instantaneous values; calculating power grid operating parameters; judging signal anomaly parameters, sending the power grid operating parameters and judging signal anomaly parameters to a liquid crystal display (LCD) to display; and controlling the thyristor controlled reactor to output reactive power. The control device can monitor the power grid operating state in real time, the safety of the reactive compensation is improved, and damages caused by inappropriate compensation of the reactive power to the power grid are decreased.

This invention disclosed is a comprehensive power quality controller for substation in the electric power system and includes a Thyristor Controlled Reactor (TCR), pure tuned passive filter Zf, additional inductor L active power filter (APF), and a coupling transformer. The Thyristor Controlled Reactor (TCR) provides inductive reactive power and controls the active power filter (APF) as the current source, it is connected with the additional inductor La in parallel via the coupling transformer, then connected to the passive filter Zf in serial to consist a hybrid power filter system, which is connected to the power grid via the circuit breaker or thyristor. The comprehensive filter system provides required capacitive reactive power and filters the harmonic produced by the load and TCR system itself. Because the capacity of the active power filter (APF) is very small which is less than 1% of the harmonic source capacity, so it is a solution with low cost but simple and reliable control mode. It can suppress influence on the passive filter by the “background harmonic” of the substation and prevent the resonance occurred between the passive filter and power grid impedance.

The invention relates to an arc furnace power quality controller based on a programmable logic controller (PLC), which mainly comprises a control system and a power quality improvement system, wherein the control system consists of an industrial personal computer, a PLC and a digital signal processor (DSP); and the power quality improvement system consists of thyristor switched capacitor - thyristor controlled reactor (TSC-TCR) reactive power compensation device and an auxiliary circuit. The controller can adjust compensation parameters in real time to improve compensation accuracy according to instantaneous reactive power in combination with furnace condition information. The arc furnace power quality controller based on the PLC has the advantages that the rapid real-time compensation can be realized aiming at the change of the reactive power and the power factor, the operating cost is low and the control stability is high.

The invention discloses a voltage reactive control system based on static reactive voltage compensation. The system comprises parallel capacitors, a switch tube, a thyristor controlled reactor, a power grid voltage and current sampling module, a signal conditioning module, a control module and a driving module. The power grid voltage and current sampling module is used for sampling data and inputting the data into the control module through the signal conditioning module; and the control module drives the switch tube or a thyristor to work through the driving module. The invention also discloses a control method of the control system. The method comprises the following steps: carrying out power grid sampling; calculating three-phase voltage and current working parameters of a power grid; selecting a control objective; calculating a compensation susceptance value; and calculating switch tube control signals and thyristor conduction angle. The method can carry out reactive power regulation in real time according to system operation information and automatically obtains an optimum operation scheme, thereby ensuring system voltage and power factor stability, reducing distributing line loss, and improving distribution network operation economy and electric energy quality level.

The invention discloses an adjusting method for a dynamic reactive compensation controller. The adjusting method comprises the following steps: firstly, collecting the busbar current of a three-phase system, the busbar voltage of the three-phase system and the current of a three-phase thyristor controlled reactor in real time; then carrying out closed loop proportional-integral-differential (PID)adjustment on the current of the three-phase thyristor controlled reactor according to the compensated admittance of each parallel branch, and outputting the triggering angle of the thyristor controlled reactor; simultaneously, carrying out closed loop PID adjustment on the busbar voltage of the three-phase system, and outputting the triggering angle of the thyristor controlled reactor; and finally, according to whether each phase of voltage is in a specific range or not, judging whether to adopt the closed loop PID adjustment of the second step or the third step, and outputting the actual triggering angle of the thyristor controlled reactor. The method provided by the invention can increase the power factor, reduce the reactive power, decrease the line loss, improve the transmission capacity of the active power of a power transmission line, stabilize the busbar voltage, and inhibit the voltage fluctuation and flicker.

The invention discloses a distributed generation reactive compensation device, relating to a grid compensation device and providing a distributed generation reactive compensation device which can operate stably and cannot generate resonance. The distributed generation reactive compensation device is provided with a thyristor controlled reactor, a fixed capacitor group, an active power filter and a control circuit, wherein the thyristor controlled reactor is directly connected with a power grid in parallel; the fixed capacitor group is connected with the active power filter in series and is then connected to the power gird; a driving pulse signal end of the control circuit is respectively connected with the thyristor controlled reactor and the active power filter. The control circuit can be provided with a grid voltage and current sampling circuit, a digital signal processing (DSP) controller, an IPM (Intelligent Power Module) driving circuit, a thyristor driving circuit, a liquid crystal display and a protection circuit.

The invention provides a hosting mode-based distributed power supply synchronizing method and a hosting mode-based distributed power supply synchronizing device. The synchronizing device consists of a thyristor control reactor, a controller and a switch, wherein the thyristor control reactor comprises two thyristors; the controller is connected with the thyristor control reactor through the thyristors; and the switch is connected in series with the thyristor control reactor. The invention overcomes the influence of voltage change due to the fact that the distributed power supply accesses a main network, ensures that the distributed power supply transmits the active power and the passive power to the main network, provides convenience for scheduling operation of the main network, and realizes the synchronization of the distributed power supply.