CN204967652U - Subway energy feedback device - Google Patents

Subway energy feedback device Download PDF

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Publication number
CN204967652U
CN204967652U CN201520606199.2U CN201520606199U CN204967652U CN 204967652 U CN204967652 U CN 204967652U CN 201520606199 U CN201520606199 U CN 201520606199U CN 204967652 U CN204967652 U CN 204967652U
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current
direct
phase
output
filter
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仇志凌
李锦�
胡磊磊
朱铮平
花跃学
刘定坤
许忠元
张勇
芮国强
万里强
张明
葛文海
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NANJING APAITEK TECHNOLOGY Co Ltd
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NANJING APAITEK TECHNOLOGY Co Ltd
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Priority to CN201510493520.5A priority patent/CN105024575B/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility

Abstract

The utility model discloses a subway energy feedback device, including the direct current switch cabinet, with the electric power cabinet of being connected of direct current switch cabinet, a transformer, wherein, the power cabinet includes 3 looks H bridge dc -to -ac converters, ac current transformer, dc -to -ac converter side filter inductor, exchange filter capacitance, second electric current hall sensor, the alternating current circuit ware, 3 each looks input of looks H bridge dc -to -ac converter links to each other with direct current switch cabinet output respectively, each looks output is connected with respective interchange mutual -inductor input respectively, each exchanges the mutual -inductor output and is connected with each self -corresponding filter input end, each wave filter output links to each other with the electric current hall sensor input that corresponds, electric current hall sensor output links to each other with alternating current circuit ware output, the direct current switch cabinet is inputed to the 3 looks H bridge monopole doubling of frequency contravariants through switching frequency f of the direct current of power cabinet, export the three -phase pulse alternating current of equivalent switching frequency for 2f. This pulse alternating current obtains the sinusoidal low pressure alternating current of three -phase through the LCL wave filter, and low pressure sinusoidal ac steps up into middling pressure sinusoidal ac feed -in middling pressure electric wire netting through the transformer. The device can effectively fall low -harmonic -wave and pollute, and the reliability is high, small, with low costs.

Description

A kind of subway energy back feed device
Technical field
The utility model relates to Feeding System of Urban Rail Transit technical field, is specifically related to a kind of subway energy back feed device.
Background technology
Urban rail transit in China development is in recent years very fast, and existing subway traction power supply mode adopts diode rectification unit to become 1500V direct current by pressing AC rectification in 35/33kV, is touched net power to the traction electric machine on subway train by direct current.But this supply power mode can only realize the unidirectional power flowing of electric energy from electrical network to motor, and motor is operated in Generator Status in braking procedure, and the mechanical energy of train converts electric energy to.In order to ensure that direct current net-fault voltage is in safe range, the basic electric energy adopting resistance power consumption mode to absorb train braking generation now, cause the significant wastage of electric energy, the heat that resistance produces also add air conditioner refrigerating burden, and this has run counter to national energy-saving and has reduced discharging policy.
Along with the development of power electronic technology, energy back feed device obtains application gradually in subway.The general principle of energy back feed device is that the direct current energy sent by motor is reverse into alternating current and feeds back to electrical network, and such electric energy just obtains regeneration, effectively improves the utilization ratio of the energy.
Domestic minority colleges and universities and enterprise have carried out useful research and exploration to subway energy back feed device: the patent of Beijing Jiaotong University and Beijing one thousand Si Yu Electrical Co., Ltd. " a kind of have no-power compensation function can present formula traction power set and control method " (application number: 201010601917.9), patent " one can present type traction power set and control method thereof " (application number: 201110118007.X) two sections of patents of Zhuzhou National Engineering Research Center of Converters Co., Ltd. are more representative.
On circuit structure, these two sections of patents are all utilize based on IGBT(insulated gate bipolar transistor) three-phase inverter of device direct current is touched net on direct current energy convert AC energy to, and feed back to 35/33kV medium voltage network by step-up transformer.Because the switching frequency of high pressure, big current IGBT is lower, in order to improve equivalent switching frequency, reduce switching harmonics to the pollution of electrical network, these two sections of patents, by the three-phase inverter serial or parallel connection of employing two triangular carrier misphases 180 degree, reach switching frequency times yupin effect.But in order to avoid the short circuit between two three-phase inverters or circulation, the interchange of two three-phase inverters exports can not be directly in parallel, can only connect boosting low pressure side two-way independent winding respectively, times yupin effect can only become medium voltage side in boosting to be embodied.The grid-connected output filter of such inverter just contains single inductance filter of transformer leakage inductance, and the switching harmonics filtration result of single inductance filter is limited, and switching harmonics will pollute electrical network.
To sum up, the subway energy back feed device of the single inductor filter of this employing will produce comparatively serious harmonic pollution problems.
Utility model content
There is provided a kind of subway energy back feed device to overcome above-mentioned technological deficiency the utility model, this device effectively can reduce harmonic pollution, and has the advantage that reliability is high, volume is little, cost is low.
The technical scheme in the invention for solving the technical problem is as follows:
A kind of subway energy back feed device, this device comprises: direct-current switch cabinet, the power cabinet be electrically connected with direct-current switch cabinet, transformer, the electric energy that feed-in direct current is touched net is by direct-current switch cabinet ingoing power cabinet, power cabinet converts direct current to low-voltage AC, low-voltage AC presses alternating current feed-in medium voltage network in transformer boost becomes, wherein
Power cabinet comprises 3 phase H bridge inverters, AC current transformer, inverter side filter inductance, ac filter electric capacity, second current Hall transducer, AC circuit breaker, each phase input of 3 phase H bridge inverters is connected with direct-current switch cabinet output respectively, each phase output terminal is connected with respective D.C mutual-inductor input respectively, each D.C mutual-inductor output is connected with each self-corresponding filter input end, each filter output is connected with corresponding current Hall sensor input, current Hall sensor output is connected with AC circuit breaker output, direct-current switch cabinet inputs to the 3 phase H bridge one pole frequency multiplication inversions of direct current through switching frequency f of power cabinet, output equivalent switching frequency is the three-phase pulse alternating current of 2f, this pulse ac electricity obtains three phase sine low-voltage AC through LCL filter.
H bridge inverter in power cabinet exports and adopts LCL filter, and inverter side filter inductance and ac filter electric capacity are arranged in power cabinet, and net side filter inductance utilizes transformer leakage inductance to realize, without the need to special outfit.
Further, described transformer is three-phase three-limb, and high-pressure side adopts delta connection, and low-pressure side adopts three-phase independent winding.
Further, described direct-current switch cabinet is electrically connected by copper bar with power cabinet.
Further, described direct-current switch cabinet is built-in: the voltage hall sensor of order electrical connection successively, direct current disconnecting link, the first direct current inlet wire fuse F1, DC filtering inductance, D.C. contactor QF1, the first current Hall transducer TA1, and, described D.C. contactor QF1 two ends parallel connection one by resistance R1 and D.C. contactor KM1 in series delayed circuit, described first current Hall transducer TA1 output in parallel with described second direct current inlet wire fuse F2 output by D.C. contactor KMd and resistance Rd discharge loop in series.
When train braking, traction electric machine on train is operated in Generator Status, braking mechanical energy converts electric energy feed-in direct current to and touches net, direct current is touched net and is connected to direct-current switch cabinet by DC feeder cabinet, the DC voltage of the voltage hall sensor collection direct current net-fault access that direct-current switch cabinet is built-in, direct current is through DC filtering inductor filter, input 3 phase H bridge inverters, inverter adopts one pole frequency multiplication to control to obtain the three-phase pulse alternating current that equivalent switching frequency is actual switch frequency twice, this pulse ac electricity is through inverter side filter inductance, ac filter electric capacity, three phase sine low-voltage AC is obtained after transformer leakage inductance filtering.AC current transformer detects the three-phase output current of inverter, carries out quick overcurrent protection; Described second current Hall transducer is used for detecting each self-corresponding three-phase low-voltage alternating current respectively, carries out closed-loop current control.Three-phase low-voltage alternating current is connected with step down side three-phase independent winding, and high voltage side of transformer adopts delta connection to be connected with medium voltage network, and three-phase low-voltage alternating current presses alternating current feed-in medium voltage network in transformer boost becomes.
Therefore, the utility model can obtain following beneficial effect:
(1) effectively reducing harmonic pollution: inverter circuit adopts 3 phase H bridges, is 2 times of actual switch frequency by one pole frequency multiplication inverter output frequency, and exports 1/2U dc, 0 ,-1/2U dcthree kinds of level, compare the U of common two level circuits dc,-U dcexport, switching harmonics amplitude can be reduced one times, thus effectively reduce harmonic pollution.
(2) waveform quality is good: the inversion of H bridge exports the effect that directly can reach 2 frequencys multiplication, and H bridge just can realize a times yupin effect in low-pressure side, ensure that the realizability of LCL filter to a great extent.
(3) reliability is high: H bridge inverter controls class and is beneficial to two level circuits, there is not the interior pipe overvoltage risk that I type tri-level circuit exists.
(4) reduce volume, reduce costs: output switch ripple frequency is high, amplitude is little, can reduce to export LCL filter size, reduce costs; Grid-connected transformer is three-phase three-limb, high-pressure side delta connection low-pressure side three-phase independent winding, output voltage 1kV.Three-phase independent winding for 3 phase H bridges provide required separately from, transformer has the short-circuit impedance of 6%, and its leakage inductance is used as the net side inductance that inverter exports LCL filter.So transformer one is held concurrently three duties, there is voltage couples, low-pressure side separately from, net side filter inductance triple functions, reduce installation cost.
Accompanying drawing explanation
Fig. 1 is a kind of subway energy back feed device structural representation disclosed in the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.In addition, if below in described each execution mode of the utility model involved technical characteristic do not form conflict each other and just can mutually combine.
A kind of subway energy back feed device, comprise: direct-current switch cabinet, the power cabinet be electrically connected by copper bar with direct-current switch cabinet electricity, transformer, the electric energy that feed-in direct current is touched net is by direct-current switch cabinet ingoing power cabinet, power cabinet converts direct current to low-voltage AC, low-voltage AC presses alternating current feed-in medium voltage network in transformer boost becomes, wherein, power cabinet comprises 3 phase H bridge inverters, AC current transformer, inverter side filter inductance, ac filter electric capacity, second current Hall transducer, AC circuit breaker, each phase input of 3 phase H bridge inverters is connected with direct-current switch cabinet output respectively, each phase output terminal is connected with respective D.C mutual-inductor input respectively, each D.C mutual-inductor output is connected with each self-corresponding filter input end, each filter output is connected with corresponding current Hall sensor input, current Hall sensor output is connected with AC circuit breaker output, direct-current switch cabinet inputs to the 3 phase H bridge one pole frequency multiplication inversions of direct current through switching frequency f of power cabinet, output equivalent switching frequency is the three-phase pulse alternating current of 2f.This pulse ac electricity obtains three phase sine low-voltage AC through LCL filter.Transformer is three-phase three-limb, and high-pressure side adopts delta connection, and low-pressure side adopts three-phase independent winding.H bridge inverter in power cabinet exports and adopts LCL filter, and inverter side filter inductance and ac filter electric capacity are arranged in power cabinet, and net side filter inductance utilizes transformer leakage inductance to realize, without the need to special outfit.
Described direct-current switch cabinet is built-in: the voltage hall sensor of order electrical connection successively, direct current disconnecting link, the first direct current inlet wire fuse F1, DC filtering inductance, D.C. contactor QF1, the first current Hall transducer TA1, and, described D.C. contactor QF1 two ends parallel connection one by resistance R1 and D.C. contactor KM1 in series delayed circuit, described first current Hall transducer TA1 output in parallel with described second direct current inlet wire fuse F2 output by D.C. contactor KMd and resistance Rd discharge loop in series.
1 be described further by reference to the accompanying drawings:
When train braking, traction electric machine on train is operated in Generator Status, braking mechanical energy converts electric energy feed-in direct current to and touches net, then by direct-current switch cabinet ingoing power cabinet, power cabinet converts direct current to interchange, the low-voltage alternating-current that power cabinet exports is boosted into middle pressure feed-in medium voltage network by transformer, and all parts is as shown in Figure 1 as follows:
DC feeder cabinet: subway direct current is touched net and is connected to direct-current switch cabinet by DC feeder cabinet, provides direct-current short circuit, overcurrent protection function;
Direct-current switch cabinet: TV1 is voltage hall sensor, detect direct current net-fault voltage, if direct current net-fault voltage is higher than the threshold value of setting, be usually set to 1700V, then master controller (based on TIDSP, being arranged in direct-current switch cabinet) controls inverter cabinet toward medium voltage network feedback electric energy; QS is direct current disconnecting link, by direct-current switch cabinet door observation window to operating personnel point out disconnecting link contact closed/disjunction situation, show feedback device direct-current switch cabinet and touch net with direct current and whether be connected; F1, F2 are direct current inlet wire fuse, for the connection that the quick cutting device when device is short-circuited fault and direct current are touched net, avoid the normal operation affecting direct current net-fault; Ld is DC filtering inductance, prevents the switching frequency ripple pollutes direct current of power cabinet from touching net; QF1 is D.C. contactor, the connection that can nonserviceable lower fast shut-off feedback device and direct current are touched net; Resistance R1 and D.C. contactor KM1 formation has delayed circuit, and the DC capacitor for power cabinet in this feedback device start-up course carries out precharge; TA1 is current Hall transducer, detects the input direct-current electric current of feedback device; D.C. contactor KMd and resistance Rd forms discharge loop, the electric charge that DC capacitor of releasing after feedback device is closed stores; TV2 is voltage hall sensor, detects DC capacitor voltage.
Power cabinet: inverter is 3 phase H bridges, adopt one pole frequency doubling technology, inverter output frequency is 2 times of actual switch frequency, and exports 1/2U dc, 0 ,-1/2U dcthree kinds of level, compare the U of common two level circuits dc,-U dcexport, switching harmonics amplitude can be reduced one times.Output switch ripple frequency is high, amplitude is little, can reduce to export LCL filter size, reduce costs; When the TV1 of direct-current switch cabinet detects the threshold value of direct current net-fault voltage higher than setting, the converting direct-current power into alternating-current power that master controller (based on TIDSP, being arranged in direct-current switch cabinet) is come direct-current switch cabinet by optical fiber control inverter, gives transformer; CT1, CT2, CT3 are AC current transformer, detect inverter three-phase output current respectively, carry out quick overcurrent protection; L1, L2, L3 are the inverter side filter inductance of every phase respectively; C1, C2, C3 are the ac filter electric capacity of every phase respectively; TA2, TA3, TA4 are current Hall transducers, detect three-phase output current respectively, for closed-loop current control; QF2, QF3, QF4 are the AC circuit breaker of every phase respectively, for overcurrent protection.
Transformer: the low-voltage alternating-current that power cabinet exports is boosted to middle pressure, feed-in medium voltage network; Transformer is three-phase three-limb, high-pressure side delta connection, connects 35/33kV electrical network, low-pressure side three-phase independent winding, output voltage 1kV; Three-phase independent winding for 3 phase H bridges provide required separately from.Transformer has the short-circuit impedance of 6%, and its leakage inductance is used as the net side inductance that inverter exports LCL filter.So transformer one is held concurrently three duties, there is voltage couples, low-pressure side separately from, net side filter inductance triple functions; PT1, PT2, PT3 are AC voltage transformer, for detection of grid voltage, provide synchronized signal to master controller (based on TIDSP, being arranged in direct-current switch cabinet) and carry out voltage feed-forward control control.H bridge main power device adopts high pressure, large power all-controlled IGBT device.
Feedback device transformer is connected to medium voltage network by high-voltage switch gear, provides ac short circuit, overcurrent protection.The present embodiment tool has the following advantages:
(1) inverter circuit adopts 3 phase H bridges, and adopt one pole frequency doubling technology, inverter output frequency is 2 times of actual switch frequency, and exports 1/2U dc, 0 ,-1/2U dcthree kinds of level, compare the U of common two level circuits dc,-U dcexport, switching harmonics amplitude can be reduced one times, output switch ripple frequency is high, amplitude is little, can reduce to export LCL filter size, reduce costs;
(2) inversion of H bridge exports the effect that directly can reach 2 frequencys multiplication, from employing two three-phase bridge carry out phase-shifting carrier wave series and parallel can only high voltage side of transformer obtain a times yupin effect have essence different, H bridge just can realize a times yupin effect in low-pressure side, largely ensure that the realizability of LCL filter;
(3) grid-connected transformer is three-phase three-limb, high-pressure side delta connection, connects 35/33kV electrical network, low-pressure side three-phase independent winding, output voltage 1kV.Three-phase independent winding for 3 phase H bridges provide required separately from.Transformer has the short-circuit impedance of 6%, and its leakage inductance is used as the net side inductance that inverter exports LCL filter.So transformer one is held concurrently three duties, there is voltage couples, low-pressure side separately from, net side filter inductance triple functions
(4) 3 phase H bridges export and adopt LCL filter, inverter side filter inductance L1, L2, L3, and ac filter electric capacity C1, C2, C3 are single-phase independence, and net side filter inductance utilizes transformer leakage inductance to realize.
Also using H-bridge circuit in Chinese patent literature CN201210233309, but this H bridge adopts half control thyristor, adopts entirely control IGBT with the present embodiment, and one pole frequency multiplication PWM control mode there is essence different; The present embodiment adopts LCL filter, wherein nets side inductance and utilizes transformer leakage inductance, single L filtering that just utilized transformer leakage inductance to do in document; Document step down side adopts multiple secondary winding, and the present embodiment only has three-phase windings.
In Chinese patent literature CN201310179540, energy back is to low voltage electric network, the present embodiment feeds back to medium voltage network, this patent documentation adopts single-phase transformer, the present embodiment adopts three-phase full-bridge converter, volume of transformer is less, weight is lighter, cost is lower, and the present embodiment adopts LCL filter, wherein net side inductance and utilize transformer leakage inductance, the single L filtering that just utilized transformer leakage inductance to do of this utility model.
In H bridge and existing apparatus that the present embodiment adopts, the comparatively normal I type tri-level circuit used contrasts, and has following advantage:
(1) two kind of circuit can export 1/2U dc, 0 ,-1/2U dcthree kinds of level, compare the U of common two level circuits dc,-U dcexport, switching harmonics amplitude can be reduced one times
(2) under identical DC bus-bar voltage input, I type three level pipe bears the half that voltage only has H bridge, can adopt lower withstand voltage pipe.Because low pressure pipe switching speed, loss are all better than high pressure pipe, under therefore may operate in higher switching frequency.But H bridge can adopt one pole frequency doubling technology, export 2 times that phase voltage switching frequency can be promoted to actual switch frequency.Like this, two kinds of circuit inversion output switch frequencies are identical
(3) three-phase H bridge needs just directly to form three-phase bridge from, I type three level without the need to isolation separately, and due to ripple in phase three-wire three circuit can partial offset, switching harmonics is better than H bridge
(4) H bridge only has 2 pipe series connection, and I type three level needs 4 pipe series connection, and compare the risk that the former adds pipe overvoltage under unusual service condition, reliability is not as H bridge
(5) under inverter mode, 4 the pipe losses of H bridge are evenly distributed, I type three level loss skewness, and outer tube loss is obviously greater than other pipes, and reliability is not as H bridge.
More than show and describe general principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and the claimed scope of the utility model is defined by appending claims, specification and equivalent thereof.

Claims (5)

1. a subway energy back feed device, this device comprises: direct-current switch cabinet, the power cabinet be electrically connected with direct-current switch cabinet, transformer, the electric energy that feed-in direct current is touched net is by direct-current switch cabinet ingoing power cabinet, power cabinet converts direct current to low-voltage AC, low-voltage AC presses alternating current feed-in medium voltage network in transformer boost becomes, it is characterized in that
Power cabinet comprises 3 phase H bridge inverters, AC current transformer, inverter side filter inductance, ac filter electric capacity, second current Hall transducer, AC circuit breaker, each phase input of 3 phase H bridge inverters is connected with direct-current switch cabinet output respectively, each phase output terminal is connected with respective D.C mutual-inductor input respectively, each D.C mutual-inductor output is connected with each self-corresponding filter input end, each filter output is connected with corresponding current Hall sensor input, current Hall sensor output is connected with AC circuit breaker output, direct-current switch cabinet inputs to the 3 phase H bridge one pole frequency multiplication inversions of direct current through switching frequency f of power cabinet, output equivalent switching frequency is the three-phase pulse alternating current of 2f, this pulse ac electricity obtains three phase sine low-voltage AC through LCL filter.
2. a kind of subway energy back feed device as claimed in claim 1, is characterized in that, the main power device of described H bridge adopts controls IGBT device entirely.
3. a kind of subway energy back feed device as claimed in claim 1, is characterized in that, described transformer is three-phase three-limb, and high-pressure side adopts delta connection, and low-pressure side adopts three-phase independent winding.
4. a kind of subway energy back feed device as claimed in claim 1, it is characterized in that, described direct-current switch cabinet is electrically connected by copper bar with power cabinet.
5. a kind of subway energy back feed device as described in claim 1-4 any one, it is characterized in that, described direct-current switch cabinet is built-in: the voltage hall sensor of order electrical connection successively, direct current disconnecting link, first direct current inlet wire fuse F1, DC filtering inductance, D.C. contactor QF1, first current Hall transducer TA1, and, described D.C. contactor QF1 two ends parallel connection one by resistance R1 and D.C. contactor KM1 in series delayed circuit, described first current Hall transducer TA1 output in parallel with described second direct current inlet wire fuse F2 output by D.C. contactor KMd and resistance Rd discharge loop in series.
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Cited By (3)

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CN105024575A (en) * 2015-08-13 2015-11-04 南京亚派科技股份有限公司 Subway energy feedback apparatus
CN109861573A (en) * 2019-03-07 2019-06-07 苏州赛得尔智能科技有限公司 A kind of low switching losses power inverter
CN111342503A (en) * 2020-04-15 2020-06-26 新风光电子科技股份有限公司 Modularized unit parallel type braking energy feedback device and control method thereof

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CN106253654A (en) * 2016-09-18 2016-12-21 中车大连电力牵引研发中心有限公司 Switch module circuit and switch module
CN107528228A (en) * 2017-09-01 2017-12-29 华东泓泽机电设备(昆山)有限公司 Ring control cabinet
CN111572359B (en) * 2020-05-29 2021-06-22 中车青岛四方车辆研究所有限公司 Multi-power-supply-system regenerative energy feedback system and feedback method

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CN101376344B (en) * 2008-09-28 2010-08-11 东南大学 Multiple-target integrated control energy-saving method of electric power supply system for subway
CN202221969U (en) * 2011-09-09 2012-05-16 山东沃森电源设备有限公司 Photovoltaic grid-connected inverter circuit topological structure
CN204517696U (en) * 2015-02-13 2015-07-29 江苏明伟万盛科技有限公司 Based on the track traffic regenerative braking energy feedback two-way current conversion circuit of IGBT
CN204967652U (en) * 2015-08-13 2016-01-13 南京亚派科技股份有限公司 Subway energy feedback device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105024575A (en) * 2015-08-13 2015-11-04 南京亚派科技股份有限公司 Subway energy feedback apparatus
CN109861573A (en) * 2019-03-07 2019-06-07 苏州赛得尔智能科技有限公司 A kind of low switching losses power inverter
CN111342503A (en) * 2020-04-15 2020-06-26 新风光电子科技股份有限公司 Modularized unit parallel type braking energy feedback device and control method thereof
CN111342503B (en) * 2020-04-15 2021-10-29 新风光电子科技股份有限公司 Modularized unit parallel type braking energy feedback device and control method thereof

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