CN204696957U - A kind of four-quadrant flow-changeable regenerated energy inversion feedback device - Google Patents

Abstract

The utility model belongs to track traffic electric power systems technology field, relate to a kind of four-quadrant flow-changeable regenerated energy inversion feedback device, its agent structure comprises isolating transformer, alternating-current switch, output filter, four quadrant convertor, input filter, pre-charge module and wire; Isolating transformer, alternating-current switch, output filter, four quadrant convertor and input filter successively serial electric information are connected, the elementary cell of single isolating transformer, alternating-current switch, output filter, four quadrant convertor and input filter composition four-quadrant flow-changeable regenerated energy inversion feedback device, the power capacity of elementary cell is adjusted as different numerical value as the case may be, and the quantity of elementary cell sets according to demand; This device is installed, safeguard, expansion is convenient, and the independence of each several part is strong, and certain unit module fault does not affect whole system, and can there is various control pattern, arithmetic speed improves many times simultaneously, and PWM more precisely and fast.

Description

A kind of four-quadrant flow-changeable regenerated energy inversion feedback device

Technical field:

The utility model belongs to track traffic electric power systems technology field, relates to a kind of regenerated energy absorption plant of inversion form, particularly a kind of four-quadrant flow-changeable regenerated energy inversion feedback device.

Background technology:

For many years, in field of track traffic, vehicle generally adopts regeneration electric braking, during regeneration electric braking, traction electric machine operates in power generation mode, to Traction networks feedback regenerated energy, if this portion of energy is not completely consumed by other vehicle or this vehicle electric load, then can cause the rising of Traction networks and direct current supply busbar voltage, jeopardize electric equipment along the line.Especially even more serious on the circuit that traffic density few, departure interval is long or rolling stock section, test wire.Cause the basic reason of this kind of phenomenon be summed up as current most of orbit traffic direct current power adopt be do not control diode rectification, electric energy only has one way flow, and regenerated energy cannot be recycled to power supply grid; In order to prevent the rising of busbar voltage, must take adequate measures, researcher proposed multiple regenerated energy processing mode both at home and abroad in recent years, also have many modes successfully to put into effect, but which kind of mode all had its pluses and minuses and suitable environment; Be summed up resistance power consumption mode, energy storage medium energy storage mode, inversion feedback mode, four-quadrant commutation inversion mode etc., often kind of mode has its extension mode, and some is also in starting and experimental stage; Resistance power consumption Method compare is ripe, control mode is also relatively simple, domestic and international most of city early application be substantially all this kind of mode, vehicle-mounted resistance is divided into disperse power consumption and earth resistance to concentrate power consumption mode, regenerative electric energy during car brakeing is consumed with the form of heat energy by heat load resistance, causes great energy waste; Moreover, in order to the amount of heat produced when dispersing brake resistance power consumption, need the increase air draft capacity along the line in platform, tunnel etc., cause secondary energy sources to waste, and when brake resistance is positioned over ground transformer station or subway station, the noise pollution caused also is that urban planning is not allowed; Response national energy-saving reduces discharging calls, and the resistance of regenerated energy power consumption mode has been not suitable with track traffic and has powered development situation.

The domestic regenerated energy absorption plant also having occurred mixing inversion (inversion feedback+resistance power consumption) form in recent years, wherein inversion feedback mainly with stand interior 400V power utilization network and rectifier transformer secondary side for feedback node, and pure inverter mode is because of above-mentioned node power capacity problem, also there is not engineering antecedent at home.But abroad, pure inversion Feedback Technology is quite ripe, has many successful cases.But this kind of mode can only solve the rising problem of DC bus-bar voltage, and what can not solve DC bus-bar voltage falls problem; Utilize super capacitor, high-performance lithium battery or the energy storage medium such as vacuum flywheel, superconductor to store regenerative electric energy during braking, the mode discharged again when Voltage Drop is optimal mode, but the series of problems such as the capacity of various energy storage medium, life-span, technique, cost limit the universal of this kind of pattern and development.As flywheel energy storage, the super capacitor energy-storage of Germany; As super capacitor energy-storage, the lithium ion battery energy storage of Japan; The super capacitor energy-storage etc. of Korea S, various energy storage mode has the pluses and minuses of oneself and realizes difficulty, awaits continuing to improve; Therefore under existing situation, the most cost-effective mode is four-quadrant unsteady flow mode, the inversion feedback when DC bus-bar voltage raises, the rectification power taking when DC bus-bar voltage reduces.This kind of mode has two preconditions: one is AC and site is pressure ring net side in centrally connected power supply, and power system capacity is enough large, there will not be energy to deliver to the phenomenon of bulk power grid; Two is when four quadrant convertor self-capacity is enough not large, need adopt the isolation boosting transformer with traction rectifier transformer paired running, like this could auxiliary as traction transformer, promotes falling of DC bus-bar voltage.

At present, meet four quadrant running, middle pressure ring net inversion feedback, can be as follows with the prior art situation of traction rectifier transformer paired running:

Beijing Jiaotong University was in application on 04 14th, 2008, publication number is the application for a patent for invention " a kind of modular energy feedback type traction power set and control method thereof " of CN101249806A disclosed on 08 27th, 2008, this patent comprises a multi winding transformer, multiple PWM rectifier unit and a central controller, this device can realize traction rectifier and regenerated energy inversion feedback function, but this device adopts the centralized control based on CAN network to multiple PWM rectifier, be not complete independence between PWM module, and the transformer adopted is a multi winding transformer, independence is more weak, because this device lays particular emphasis on traction power supply, not with existing traction rectifier transformer parallel running, cause volume very large, with high costs, in fact more much larger than braking energy times of haulage capacity, taking haulage capacity into account will cause unnecessary cost to drop into braking energy feedback, and this device does not carry out standing no-power compensation function, Zhuzhou Conversion Technology National Engineering Research Center was in application on 05 09th, 2011, publication number is the application for a patent for invention " one can present type traction power set and control method thereof " of CN102267405A disclosed in the 07 day December in 2011, this device also by a multiplex transformer, be no less than two four quadrant convertor module, direct-current switch cabinet etc. part form, there are traction, feedback or SVG tri-kinds of mode of operations, and can be compatible with existing electric power system, can be arranged in juxtaposition with diode rectification traction link seat, but the four quadrant convertor modular circuit topological structure that this device adopts is two level topologys, IGBT withstand voltage is high, harmonic content and filtration module volume all can be relatively large, and this device also adopts multiple converter module centralized control, all four quadrant convertor module common voltage outer shroud controlling units under 3 kinds of mode of operations, between four limit current transformers, it is not complete separate state between Transformer Winding, still traction power supply aspect is by patent name also this device emphasis known, the volume of integral device can be larger than the device for regenerated energy inversion feedback.

Summary of the invention:

Goal of the invention of the present utility model is the shortcoming overcoming prior art existence, seek design and a kind of four-quadrant flow-changeable regenerated energy inversion feedback device is provided, electric energy inversion during rail traffic vehicles regenerative braking is fed back to track traffic and powers middle pressure ring net side by this device, reduces the lifting of the DC bus-bar voltage that car brakeing causes; Guide middle pressure ring net side electric energy into DC bus by controlled rectification technology, lifting vehicle traction starts falling of the DC bus-bar voltage caused; By controlling power flow direction, compensation network reactive power, improves the quality of power supply.

To achieve these goals, the four-quadrant flow-changeable regenerated energy inversion feedback device that the utility model relates to, its agent structure comprises isolating transformer (TB), alternating-current switch (KMA), output filter (LC), four quadrant convertor (BL), input filter (C), pre-charge module; Isolating transformer, alternating-current switch, output filter, four quadrant convertor and input filter successively serial electric information are connected, be connected with AC network by killer switch after the parallel connection of isolating transformer outlet side, be connected with direct current supply bus by pre-charge module after four quadrant convertor DC side parallel, four quadrant convertor AC is connected with independently isolating transformer by alternating-current switch, makes Fault Isolation and realize switching to control; The elementary cell of single isolating transformer, alternating-current switch, output filter, four quadrant convertor and input filter composition four-quadrant flow-changeable regenerated energy inversion feedback device, the power capacity of elementary cell is defined as different numerical value as the case may be, and the quantity of elementary cell sets according to overall power requirement.

The four quadrant convertor that the utility model relates to is made up of 12 IGBT power switch pipes and 6 clamp diodes, IGBT power switch pipe adopts Infineon 1700V/600A specification switching tube, four quadrant convertor main circuit configures corresponding Hall element testing circuit, temperature observation circuit, fast acting fuse protective circuit and peak absorbing circuit, four quadrant convertor is module-integrated structure, every phase four IGBT power switch pipes form three kinds of switch combination states in pairs in groups, amount to 27 kinds of switch combination states, represent 27 space vector of voltage, control system calculates the action time of each vector of each effect vector according to the relative position of object vector in this space vector coordinate, and provide corresponding driving pulse.

The output filter that the utility model relates to is module-integrated structure, is made up of three-phase LC filter circuit.

The input filter that the utility model relates to is module-integrated structure, is made up of the grading resistor of derided capacitors unit and monomer electric capacity.

The pre-charge module that the utility model relates to is module-integrated structure, is made up of isolation contactor, charging resistor, charging contactor, repid discharge resistance and electric discharge contactor.

The isolating transformer that the utility model relates to, alternating-current switch, output filter, four quadrant convertor, separate and be drawer type hot-line insertion and extraction structure between input filter and pre-charge module.

The four quadrant convertor internal configurations that the utility model relates to has independently control unit, and the fault of a four quadrant convertor does not affect the overall performance of package unit.

The controlled rectification that the four quadrant convertor that the utility model relates to adopts and inversion grid connection circuit topological structure are clamping type tri-level inversion structure, boosting rectification, multi-level inverse conversion and static reactive power compensation mode of operation can be run on, the Double closed-loop of voltage and current link adopted and rectification, inversion, reactive power compensation PI controlling unit are separate, share link.

The pulse width modulation mode of the four quadrant convertor that the utility model relates to adopts the space vector width pulse modulation method (SVPWM) based on neutral point voltage control.

The four-quadrant flow-changeable regenerated energy inversion feedback device that the utility model relates to; also comprise its corresponding supervisory control system; this system configuration wide area network remote monitoring function; manufacturer's wide area network remote comprehensively monitoring and the LAN integrated monitoring of user can parallel runnings; and incorporate the 5 large exponentiation algorithms such as electrical safety index, electric power quality index, electrical fire index, efficiency damped expoential; and embody with Visual Dynamic information interface image, possess analysis and the protection of more deep layer.

Compared with prior art, each several part is completely separate for the utility model, and is drawer type hot-line insertion and extraction structure, and therefore install, safeguard, expand conveniently, the independence of each several part is strong, and certain unit module fault does not affect whole system; Because isolating transformer unit module is separate, by arranging different no-load voltage ratio transformer unit, and can there is multiple electric pressure in site simultaneously; Because four-quadrant current transforming unit control system is independent, can there is various control pattern, arithmetic speed improves many times simultaneously, and PWM is more precisely with quick; In high-power scope, have employed multi-level four-quadrant Semiconductor Converting Technology, inversion exports THD and reduces, and voltage utilization is high, and filtration module volume reduces; Supervisory control system incorporated the 5 large exponentiation algorithms such as electrical safety index, electric power quality index, electrical fire index, efficiency damped expoential, possesses analysis and the protection of more deep layer.

Accompanying drawing illustrates:

Fig. 1 is the four-quadrant flow-changeable regenerated energy inversion feedback device structural principle schematic diagram that the utility model relates to.

Fig. 2 is the application schematic diagram of the four-quadrant flow-changeable regenerated energy inversion feedback device that the utility model relates to.

Fig. 3 is the three level four quadrant convertor circuit topological structure schematic diagram that the utility model embodiment relates to.

Fig. 4 is the four quadrant convertor control principle schematic diagram that the utility model embodiment relates to.

Fig. 5 is the equivalent circuit theory schematic diagram that four quadrant convertor that the utility model embodiment relates to sets up vector equation.

Fig. 6 is that the four-quadrant converter limit that the utility model embodiment relates to runs vector control figure.

Embodiment:

As embodiment of the present utility model, be that instantiation is described in detail below in conjunction with accompanying drawing content and with direct current 1500V traction rectifier transformer parallel running mode.

Embodiment:

The four-quadrant flow-changeable regenerated energy inversion feedback device that the present embodiment relates to as shown in Figure 1,, comprise isolating transformer (TB) 1, alternating-current switch (KMA) 2, output filter (LC) 3, four quadrant convertor (BL) 4, input filter (C) 5, pre-charge module 9; Isolating transformer 1, alternating-current switch 2, output filter 3, four quadrant convertor 4 and input filter 5 are sequentially connected in series, the parallel connection of isolating transformer 1 outlet side is connected with AC network 7 by killer switch 10 afterwards, is connected after four quadrant convertor DC side parallel by pre-charge module 9 with direct current supply bus 8; Single isolating transformer 1, alternating-current switch 2, output filter 3, four quadrant convertor 4 and input filter 5 form the elementary cell 6 of four-quadrant flow-changeable regenerated energy inversion feedback device, the power capacity of elementary cell 6 is adjusted as different numerical value as the case may be, the quantity of elementary cell 6 sets according to demand, in the present embodiment, elementary cell rated capacity is fixed tentatively as 250kW, totally 8 elementary cell composition 2MW capacity four-quadrant flow-changeable regenerated energy inversion feedback devices.

In the present embodiment, isolating transformer TB1 ~ isolating transformer TB8, totally 8 isolating transformer composition 1MW rated power transformer cases, each isolating transformer primary side (current transformer is seen to electrical network direction) is connected by corresponding A.C. contactor KMA1 ~ KMA8, is connected after each isolating transformer secondary side (current transformer is seen to electrical network direction) is in parallel by ac hv breaker QF with AC network 7; By output filter Lc1 ~ Lc8, four quadrant convertor BL1 ~ BL8, input filter C1 ~ C8, pre-charge module composition converter cabinet, input filter C1 ~ C8 is connected with pre-charge module 9 after the parallel connection of direct current input side; Pre-charge module 9 is by isolation contactor KMD, and charging resistor Rc and charging contactor KMC, repid discharge resistance Rf and electric discharge contactor KMF are connected; Pre-charge module 9 exports (DC circuit breaker or electric isolating switch) by the feeder line of DC bus and is connected with direct current supply bus 8; Middle pressure ring net AC switch cubicle or DC feeder switch cubicle may be comprised depending on engine request apparatus of the present invention.

A kind of application scenarios of the four-quadrant flow-changeable regenerated energy inversion feedback device that the present embodiment relates to as shown in Figure 2, this device DC side is connected with direct current supply bus 8, direct current supply bus 8 is connected with traction power supply middle-voltage network 701 by traction substation 11, as this matched with devices isolation boosting transformer 101, its secondary side (current transformer is seen to electrical network direction) is connected with traction power supply middle-voltage network 701, also be connected with transformer station low pressure 400V network 702 by step-down isolation transformer 102 secondary side (current transformer is seen to electrical network direction), when there being train 15 regenerative braking to cause DC bus-bar voltage to raise, this plant running is in inversion feedback pattern, now the flow direction of electric energy is regenerative braking car-DC Traction Network 14-direct current supply bus 8-four-quadrant flow-changeable regenerated energy inversion feedback device 13-traction power supply middle-voltage network 701, when accelerating when there being launch train to cause direct current supply busbar voltage to be fallen, this plant running is in boosting rectification mode, as the auxiliary of traction rectifier transformer 11, electric energy is guided into DC Traction Network 14 from traction power supply middle-voltage network 701, now the flow direction of electric energy is traction power supply middle-voltage network 701-four-quadrant flow-changeable regenerated energy inversion feedback device 13-direct current supply bus 8-DC Traction Network 14-Acceleration of starting car, when four-quadrant flow-changeable regenerated energy inversion feedback device runs on SVG pattern, this device is run by operation at leading power factor or perception and injects or absorbing reactive power to traction power supply middle-voltage network, improves the traction power supply middle-voltage network quality of power supply.

As shown in Figure 3, in Fig. 3,3 for exchanging output filter, and 4 is four quadrant convertor, and 5 is input filter for the three level four-quadrant current transforming unit circuit topological structure that the present embodiment relates to, input filter 5 is made up of the parts such as grading resistor of derided capacitors unit Cd1, Cd2 and monomer electric capacity, and form 2700V/1560uF filter capacitor unit by 450V/4700uF electrochemical capacitor, whole input filter 5 is module-integrated structure, four quadrant convertor 4 is by Sa1 ~ Sa4, Sb1 ~ Sb4, Sc1 ~ Sc4, totally 12 IGBT power switch pipes and Da1 ~ Da2, Db1 ~ Db2, Dc1 ~ Dc2, the device composition three level four-quadrant convertor circuits such as 6 clamp diodes, IGBT have employed Infineon 1700V/600A specification switching tube, main circuit is configured with corresponding Hall element to detect, temperature monitoring, the auxiliary circuits such as fast acting fuse protection and peak absorbing circuit, whole is drawer type guide rail connect-disconnect structure, every phase 4 IGBT form 3 kinds of switch combination states in pairs in groups, three-phase amounts to 27 kinds of switch combination states, represent 27 space vector of voltage, control system calculates the action time of each vector of each effect vector according to the relative position of object vector in this space vector coordinate, and provide corresponding driving pulse, exchange output filter 3 to be made up of three-phase LC filter circuit, whole output filter 3 is module-integrated structure, and in this example, filter inductance La, Lb, Lc are 600uH, and filter capacitor Ca, Cb, Cc are 800uF, often forms inverted L shape filter circuit mutually, under equal conditions, three level four-quadrant current transforming unit output current THD is just at half than two level inverse conversion structures, adds applicable software and hardware filtering, just can make output voltage, electric current THD is less than 4%.Although the harmonic content of output voltage, electric current and switching frequency have certain relation, but the modulating wave computing quality of main still control system and corresponding filter effect, be not that more high harmonic content is less for switching frequency, power loss is large on the contrary, heating power large for switching frequency height, and switching device performance will decline.Three level four-quadrant current transforming unit due to each power switch pipe bear withstand voltage be two level time half, therefore relative low voltage, small power switch pipe can be adopted, although quantitatively turned over one times, the overall cost of switching tube has reduced one times incessantly compared with high-tension high-power switching tube during two level.

The output filtering that this example adopts is 2 rank filtering, more complex relative to inductor filter on the inner Feedforward Decoupling algorithm of controller, but is better than single-order filtering on filter volume and filter effect.

The four quadrant convertor control principle schematic diagram that the present embodiment relates to as shown in Figure 4, in Fig. 4,16 is current transforming unit, 17 is DC bus-bar voltage collection module, 18 is each four quadrant convertor control module, in current transforming unit 1, gather line voltage parameter at output filtering unit rear class place, gather output current parameter at inverter bridge outlet side, input filter prime place gathers DC bus-bar voltage parameter; DC bus-bar voltage collection module 17 is also responsible for precharge and the function such as repid discharge operation, A.C. contactor control of Support Capacitor, DC bus-bar voltage collection module 17 sends to each current transformer control module 18 the real-time change number of delivering letters of busbar voltage, carry out filtering and AD sampling by each current transformer control module 18 pairs of DC bus-bar voltage, each like this current transformer control module 18 is both separate in turn saves all the other Hall elements; In four quadrant convertor control module 18, by voltage acquisition module, low pass filtered is carried out to voltage on line side and involve AD sampling, three-phase voltage value completes phase-locked carry out abc-dq coordinate transform in 3 phase digital phase-locked loop modules after, Tracking Frequency of Power Grids and phase place, and send synchro angle signal to other coordinate transform link, realize synchronous rotation transformation.

The present embodiment active current I _dwhether set-point computing module has vehicle to be in regenerative braking state according to the rectification calculated value synthetic determination of given DC bus-bar voltage threshold value and actual DC bus voltage value, busbar voltage rate of change and AC voltage, and carry out Isobarically Control computing according to DC bus-bar voltage threshold value and actual DC busbar voltage difference, draw target absorption active current value I' _d; Reactive current I _qset-point computing module, according to plant running pattern, calculates corresponding reactive current set-point I' _q, the I' when plant running is in rectification or inverter mode _q=0, the I' when plant running is in reactive power compensation pattern _qfor based on the advanced of power factor computing or lagging current, its amplitude is relevant with the reactive power of required compensation.I' _dwith I' _qwith actual output current I that is corresponding, that obtain after coordinate transform _abcactive current I _dand reactive current I _qreference active voltage vector U' is drawn after carrying out PI computing, Feedforward Decoupling computing _dand U' _q, U' _d, U' _qand synchro angle θ obtains benchmark three-phase voltage vector U' through 2r/3s conversion _abc; SVPWM pulse width modulation module is according to U' _abcposition calculation in space vector coordinate goes out trigger impulse sequence, in order to remove the coupled interference of filter unit to PI adjustment module, at U' _dand U' _qthe Feedforward Decoupling operation link that adds of operation link.

The four quadrant convertor that the present embodiment relates to sets up the equivalent circuit theory figure of vector equation as shown in Figure 5, can show that following vector equation is set up.

$\stackrel{\→}{E}=\stackrel{\→}{V}+(j\mathrm{\ω}L+R)\×\stackrel{\→}{I}---\left(1\right)$

That is, $\left[\begin{array}{c}{e}_a\\ e_b\\ e_c\end{array}\right]=R\left[\begin{array}{c}{i}_a\\ i_b\\ i_c\end{array}\right]+L\left[\begin{array}{c}{i}_a^{\′}\\ i_b^{\′}\\ i_c^{\′}\end{array}\right]+\left[\begin{array}{c}{v}_a\\ v_b\\ v_c\end{array}\right]---\left(2\right)$

In formula (2), e _a, e _b, e _cfor net side three-phase voltage, i _a, i _b, i _cfor inverter bridge leg output current, v _a, v _b, v _cfor inverter bridge leg output voltage, i' _a, i' _b, i' _cfor i _a, i _b, i _ctime differential, formula (2) obtains after park conversion

$\{\begin{array}{c}L\frac{{\mathrm{di}}_d}{dt}=-{\mathrm{Ri}}_d+{\mathrm{\ωLi}}_q+e_d-v_d\\ L\frac{{\mathrm{di}}_d}{dt}=-{\mathrm{\ωLi}}_q-{\mathrm{Ri}}_q-v_q\end{array}---\left(3\right)$

In formula (3), i _d, i _qfor inverter bridge leg output current i _a, i _b, i _cdq axle component under dq rotational coordinates, v _d, v _qfor inverter bridge leg output voltage v _a, v _b, v _cdq axle component under dq rotational coordinates, e _dfor the d axle component of voltage on line side under dq rotational coordinates, negligible resistance loss and switching loss, draw following alternating current-direct current power-balance formula

$\frac{3}{2}(e_d{i}_d+e_q{i}_q)=v_{dc}\×i_{dc}---\left(4\right)$

In formula (4), v _dc, i _dcfor inverter bridge DC voltage and current component.

The four-quadrant converter limit that the present embodiment relates to runs vector control figure as shown in Figure 6, in Fig. 6 (a), delayed phase angle be δ, with same-phase, four-quadrant current transforming unit is operated in rectification state, and power factor is 1.In Fig. 6 (b), in advance phase angle be δ, with phase 180 degree, four-quadrant current transforming unit is operated in inverter mode, and power factor is-1.In Fig. 6 (c), delayed phase angle be δ, in advance 90 degree, phase place, four-quadrant current transforming unit is operated in capacitive reactive power compensating coefficient.In Fig. 6 (d), in advance phase angle be δ, delayed 90 degree, phase place, four-quadrant current transforming unit is operated in perceptual reactive absorption state.

Claims (6)

1. a four-quadrant flow-changeable regenerated energy inversion feedback device, is characterized in that agent structure comprises isolating transformer, alternating-current switch, output filter, four quadrant convertor, input filter, pre-charge module and wire, isolating transformer, alternating-current switch, output filter, four quadrant convertor and input filter successively serial electric information are connected, be connected with AC network by killer switch after the parallel connection of isolating transformer outlet side, be connected with direct current supply bus by pre-charge module after four quadrant convertor DC side parallel, four quadrant convertor AC is connected with independently isolating transformer by alternating-current switch, single isolating transformer, alternating-current switch, output filter, the elementary cell of four quadrant convertor and input filter composition four-quadrant flow-changeable regenerated energy inversion feedback device, the power capacity of elementary cell is defined as different numerical value as the case may be, the quantity of elementary cell sets according to overall power requirement.

2. four-quadrant flow-changeable regenerated energy inversion feedback device according to claim 1; it is characterized in that described four quadrant convertor is made up of 12 IGBT power switch pipes and 6 clamp diodes; IGBT power switch pipe is 1700V/600A specification switching tube; four quadrant convertor main circuit configures corresponding Hall element testing circuit, temperature observation circuit, fast acting fuse protective circuit and peak absorbing circuit; four quadrant convertor is module-integrated structure, and every four IGBT power switch pipes mutually form three kinds of switch combination states in pairs in groups.

3. four-quadrant flow-changeable regenerated energy inversion feedback device according to claim 1, is characterized in that described output filter is module-integrated structure, is made up of three-phase LC filter circuit; Input filter is module-integrated structure, is made up of the grading resistor of derided capacitors unit and monomer electric capacity; Pre-charge module is module-integrated structure, is made up of isolation contactor, charging resistor, charging contactor, repid discharge resistance and electric discharge contactor.

4. four-quadrant flow-changeable regenerated energy inversion feedback device according to claim 1, is characterized in that described isolating transformer, alternating-current switch, output filter, four quadrant convertor, separate and be drawer type hot-line insertion and extraction structure between input filter and pre-charge module.

5. four-quadrant flow-changeable regenerated energy inversion feedback device according to claim 1, is characterized in that described four quadrant convertor internal configurations has independently control unit.

6. four-quadrant flow-changeable regenerated energy inversion feedback device according to claim 1, is characterized in that the controlled rectification that described four quadrant convertor adopts and inversion grid connection circuit topological structure are clamping type tri-level inversion structure.