WO2016176998A1 - Convertisseur auxiliaire ayant une multi-protection - Google Patents

Convertisseur auxiliaire ayant une multi-protection Download PDF

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Publication number
WO2016176998A1
WO2016176998A1 PCT/CN2015/097506 CN2015097506W WO2016176998A1 WO 2016176998 A1 WO2016176998 A1 WO 2016176998A1 CN 2015097506 W CN2015097506 W CN 2015097506W WO 2016176998 A1 WO2016176998 A1 WO 2016176998A1
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WO
WIPO (PCT)
Prior art keywords
output
resistor
current sensor
current
voltage
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Application number
PCT/CN2015/097506
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English (en)
Chinese (zh)
Inventor
姬惠刚
张桂成
高永军
武彩生
朱剑波
唐子辉
刘峰东
蒋学君
丁巧娅
宜雷
Original Assignee
永济新时速电机电器有限责任公司
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Application filed by 永济新时速电机电器有限责任公司 filed Critical 永济新时速电机电器有限责任公司
Publication of WO2016176998A1 publication Critical patent/WO2016176998A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters

Definitions

  • the circuits of the existing auxiliary converter device mainly include: a step-down chopper circuit, a high-frequency transformer, a rectifier circuit, and an inverter circuit.
  • the step-down chopper circuit inverts the high-voltage direct current of the intermediate circuit of the traction converter into a low-voltage alternating current, and the alternating current is stepped down by the high-frequency transformer and then rectified into a direct current by the rectifier circuit, and then the inverter circuit inverts the direct current into The AC power required by the auxiliary equipment.
  • the invention provides an auxiliary current transformer with multiple protections for solving the problem that the existing auxiliary converter lacks a protection circuit, has a high failure rate, and increases the running cost of the locomotive.
  • the invention provides an auxiliary current transformer with multiple protections, comprising: a first protection circuit, an inverter circuit, a second protection circuit and a control circuit;
  • the first protection circuit, the inverter circuit and the second protection circuit are sequentially connected and respectively connected to the control circuit;
  • the first protection circuit includes a first switch, a first resistor, and a second resistor;
  • FIG. 1 is a schematic structural view of a current transformer with multiple protections provided by the present invention
  • FIG. 3 is a schematic structural diagram of a second protection circuit of an auxiliary converter with multiple protections according to the present invention.
  • the first protection circuit 100, the inverter circuit 110, and the second protection circuit 120 are sequentially connected and respectively connected to the control circuit 130.
  • the first protection circuit 100 includes a first switch 101 and a first resistor 102. And a second resistor 103. One ends of the first switch 101 and the first resistor 102 are respectively connected to the input end of the DC voltage, the other end of the first resistor 102 is connected to one end of the second resistor 103, and the other end of the second resistor 103 One end and the other end of the first switch 101 are respectively connected to a positive input end of the inverter circuit 110, and a control end of the first switch 101 is connected to the control circuit 130.
  • the auxiliary inverter adopts the active power and reactive power droop control in the DQ coordinate system, and adopts the traditional current inner loop, voltage outer loop and active power and reactive power control loop and other multi-loop control methods. That is, when the phase and amplitude deviation of the output voltage of each inverter in the parallel system are small, the active circulating current of the parallel system is related to the phase difference of the output voltage, and the reactive current flow is related to the amplitude difference of the output voltage, therefore, each auxiliary Based on the respective active power and reactive power, the converter adjusts the frequency and amplitude of the respective output voltages to achieve the current sharing operation of each inverter in the system.
  • the auxiliary converter adopts the space vector control algorithm, which converts the detected voltage and current through 3-2 coordinate transformation, and then obtains the modulus value of the voltage and current space vector through polar coordinate transformation, and then sets the modulus and voltage output.
  • the fixed value is sent to the proportional integral controller (PIC), and the output voltage vector is given. It is sent to the pulse width (Pulse-Width Modulation, PWM for short) modulator together with the phase signal generated by the angle generator. , the calculation produces a modulated wave.
  • PIC proportional integral controller
  • the inverter adopts Space Vector Pulse Width Modulation (SVPWM) control.
  • SVPWM is an optimized PWM technology, which can significantly reduce the harmonic components of the inverter output current and its control is simple and digital. Easy to implement and high voltage utilization.
  • the current inner loop of the double loop control scheme expands the bandwidth of the inverter control system, so that the dynamic response of the inverter is accelerated, the harmonic content of the output voltage is reduced, and the nonlinear load adaptability is enhanced.
  • the auxiliary converter with multiple protections provided by the embodiment of the invention provides a protection circuit before and after the inverter circuit, and effectively protects and controls the input voltage and the output voltage of the inverter circuit, especially by inputting current to the inverter circuit.
  • the control effectively avoids the damage of the inverter circuit by the large pre-charge current, greatly reduces the failure rate of the auxiliary converter, and reduces the maintenance and operation cost of the locomotive.
  • FIG. 2 is a schematic structural diagram of a first protection circuit of an auxiliary converter with multiple protections according to the present invention.
  • the first protection circuit 100 of the auxiliary converter 10 with multiple protections further includes a first voltage sensor 201, a fuse 202, and a first current sensor 203. And a DC reactor 204.
  • the two ends of the first voltage sensor 201 are respectively connected to the two input ends of the DC voltage; one end of the fuse 202 is connected to the positive input end of the DC voltage, and the other end of the fuse 202 is Connected to the first switch 101 and one end of the first resistor 102; the positive input end of the first current sensor 203 is connected to the other end of the first switch 101, and the negative input of the first current sensor 203 is a negative input end of the DC voltage is connected, a positive output end of the first current sensor 203 is connected to an input end of the DC reactor 204, and a negative output end of the first current sensor 203 and the inverter circuit
  • the negative input terminal of 110 is connected; the output of the DC reactor 204 is connected to the positive input terminal of the inverter circuit 110.
  • X1 is the positive end of the DC bus
  • X2 is the negative end of the DC bus
  • the first voltage sensor 201 is connected in parallel on the DC input side of the auxiliary converter, and the input voltage is effectively detected, which can be real-time.
  • the overvoltage or undervoltage fault is generated at the monitoring input; 202 is a fuse, and the auxiliary converter is over-current protected to avoid affecting the intermediate DC link of the traction converter when the auxiliary converter is overloaded, and assisting the auxiliary converter
  • the current device is protected by itself;
  • the first current sensor is a differential current sensor, which mainly detects the difference between the input current and the output current, forms a current closed loop for the entire auxiliary converter, and ensures the coordination of the input and output currents;
  • the DC reactor 204 The harmonic filtering of the input DC voltage is performed to make the input voltage more stable.
  • the second voltage sensor 205 monitors the filtered voltage to ensure entry.
  • the voltage value to the inverter circuit is normal, and the inverter circuit is overvoltage and undervoltage protection.
  • the first protection circuit 100 further includes: a first capacitor 206, a second capacitor 207, a third resistor 208, and a fourth resistor 209.
  • FIG. 3 is a schematic structural diagram of a second protection circuit of an auxiliary converter with multiple protections according to the present invention.
  • the second protection circuit 120 in FIG. 1 includes a second current sensor 210, a third current sensor 211, and a fourth current sensor 212.
  • the input end of the second current sensor 210 is connected to the first output end of the inverter circuit 110, the output end of the second current sensor 210 is used to output a first alternating current, and the third current sensor 211 is The input end is connected to the second output end of the inverter circuit 110, and the output end of the third current sensor 211 is configured to output a second alternating current; the fourth current sensor An input end of 212 is connected to a third output end of the inverter circuit 110, and an output end of the fourth current sensor 211 is used to output a third alternating current.
  • the second current sensor 210, the third current sensor 211, and the fourth current sensor 212 are common current sensors for detecting the three-phase current after the inverter, so that the load can be over-current protected.
  • the second protection circuit 120 further includes an AC reactor 213, an AC capacitor 214, and a transformer 215.
  • the second protection circuit 120 further includes: a fifth current sensor 216, a sixth current sensor 217, a seventh current sensor 218, a fifth resistor 219, and a sixth resistor 220.
  • the fifth current sensor 216 and the sixth current sensor 217 monitor the output current to form an overcurrent protection for the front and rear stages of the circuit;
  • the seventh current sensor 218 is a ground current sensor, and the sampling resistor 219 through the front end thereof Sampling with 220 to detect whether the inverter circuit has excessive ground current, whether there is a ground fault, and grounding the components. Protection.
  • the three input ends of the air circuit breaker 221 are respectively connected to the output end of the fifth current sensor 216, the output end of the sixth current sensor 217, and the other output end of the transformer 215; the air circuit breaker 221 The output is used to output voltage.
  • the fan can be cooled to cool the power device in the inverter circuit, and a small fan can be set to dissipate heat for the resistance platform in the circuit to ensure the resistance.
  • the temperature should not be too high, and the air circuit breaker 221 supplies power to the cooling fan and the small fan, and performs over-voltage and over-current protection for the cooling fan and the small fan.
  • the second protection circuit 120 further includes: a third voltage transformer 222.
  • the three input ends of the third voltage transformer 222 are respectively connected to the three output ends of the inverter circuit 110, and the three output ends of the third voltage transformer 222 are respectively connected with three of the control circuits. The input is connected.
  • the third voltage transformer monitors the phase, amplitude and frequency of the output voltage and transmits it to the control circuit for determination to ensure normal output voltage.
  • the second protection circuit further includes: a grid-connecting contactor (not shown).
  • the three input ends of the grid-connecting contactor are respectively connected to the three output ends of the inverter circuit, and the three output ends of the grid-connecting contactor are respectively used for outputting alternating current.
  • a plurality of auxiliary converters may be operated simultaneously in the locomotive, and a grid-connecting contactor may be provided to protect the load to over-press the load when the auxiliary converter is connected to the grid. Or overcurrent protection.
  • grounding and electromagnetic interference protection are provided to other components in the auxiliary converter to further provide the reliability of the auxiliary converter with multiple protections.
  • the auxiliary converter with multiple protections provided by the embodiment of the invention provides a protection circuit before and after the inverter circuit, and effectively protects and controls the input voltage and the output voltage of the inverter circuit, especially by inputting current to the inverter circuit.
  • the control effectively avoids the damage of the inverter circuit by the large pre-charge current, greatly reduces the failure rate of the auxiliary converter, and reduces the failure rate.
  • Locomotive maintenance and operating costs The voltage and current are detected and protected at the output of the auxiliary converter to reduce the damage to the load due to the auxiliary converter failure.
  • the auxiliary converter is provided with grid protection to further improve the auxiliary variable.
  • the reliability of the flow device reduces the failure rate of the auxiliary converter, saves the maintenance time of the EMU, and improves the reliability of the EMU.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne un convertisseur auxiliaire ayant une multi-protection et comprenant un premier circuit de protection (100), un circuit inverseur (110), un second circuit de protection (120) et un circuit de commande (130). Le premier circuit de protection (100), le circuit inverseur (110) et le second circuit de protection (120) sont connectés séquentiellement, et sont respectivement connectés au circuit de commande (130). Le premier circuit de protection (100) comprend un premier commutateur (101), une première résistance (102) et une seconde résistance (103). Une extrémité de chacun du premier commutateur (101) et de la première résistance (102) est connectée à une extrémité d'entrée de tension de courant continu, et l'autre extrémité de la première résistance (102) est connectée à une extrémité de la seconde résistance (103). L'autre extrémité de la seconde résistance (103) et l'autre extrémité du premier commutateur (101) sont respectivement connectées à une extrémité d'entrée positive du circuit inverseur (110). Une extrémité de commande du premier commutateur (101) est connectée au circuit de commande (130). Le convertisseur auxiliaire protège et commande efficacement une tension d'entrée et une tension de sortie d'un circuit inverseur et commande un courant d'entrée du circuit inverseur, évitant ainsi efficacement une détérioration d'un grand courant de précharge, réduisant ainsi considérablement d'un taux de défaut du convertisseur auxiliaire et réduisant le coût de maintenance et de fonctionnement de la locomotive.
PCT/CN2015/097506 2015-05-06 2015-12-15 Convertisseur auxiliaire ayant une multi-protection WO2016176998A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510226890.2 2015-05-06
CN201510226890.2A CN104811025B (zh) 2015-05-06 2015-05-06 具有多重保护的辅助变流器

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Cited By (1)

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CN115549504A (zh) * 2022-12-02 2022-12-30 湖南大学 一种三电平储能变流器的控制方法

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CN104811025B (zh) * 2015-05-06 2017-11-21 中车永济电机有限公司 具有多重保护的辅助变流器
CN106080207B (zh) * 2016-07-07 2018-03-13 中车大连机车车辆有限公司 交直交电路接地保护方法及柴油发电机组、机车
CN106787624A (zh) * 2016-12-28 2017-05-31 滁州品之达电器科技有限公司 一种逆变装置的控制方法
CN112406566B (zh) * 2020-11-10 2022-05-17 中车大同电力机车有限公司 机车动力源电路系统

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CN102638155A (zh) * 2012-03-21 2012-08-15 株洲南车时代电气股份有限公司 一种集中式辅助变流装置
CN103915994A (zh) * 2013-01-07 2014-07-09 永济新时速电机电器有限责任公司 过压保护装置和机车辅助变流器
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115549504A (zh) * 2022-12-02 2022-12-30 湖南大学 一种三电平储能变流器的控制方法
CN115549504B (zh) * 2022-12-02 2023-04-07 湖南大学 一种三电平储能变流器的控制方法

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