WO2013135088A1 - 辅助变流器 - Google Patents

辅助变流器 Download PDF

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Publication number
WO2013135088A1
WO2013135088A1 PCT/CN2012/087610 CN2012087610W WO2013135088A1 WO 2013135088 A1 WO2013135088 A1 WO 2013135088A1 CN 2012087610 W CN2012087610 W CN 2012087610W WO 2013135088 A1 WO2013135088 A1 WO 2013135088A1
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Prior art keywords
unit
voltage
output
auxiliary
phase
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PCT/CN2012/087610
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English (en)
French (fr)
Inventor
唐子辉
高永军
王彬
蒋学君
牛勇
张中
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永济新时速电机电器有限责任公司
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Publication of WO2013135088A1 publication Critical patent/WO2013135088A1/zh

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Classifications

    • 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
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only

Definitions

  • the present invention relates to converter technology, and more particularly to an auxiliary converter, which belongs to the field of electrical technology. Background technique
  • auxiliary converters use open loop control, including control modules and power modules. ⁇ Adjust the voltage modulation control mode, adjust the voltage by changing the modulation ratio of Pulse Width Modulation (PWM) output, and change the frequency of the output voltage by changing the frequency of the PWM output waveform.
  • PWM Pulse Width Modulation
  • the present invention provides an auxiliary converter for solving the technical defect that the output voltage of the auxiliary converter is unstable in the prior art, and the auxiliary converter and the AC load device are easily damaged.
  • the invention provides an auxiliary current converter, comprising an auxiliary power unit, a current detecting unit, a transformer unit, a filtering unit, an output voltage detecting unit and an auxiliary control unit;
  • the auxiliary power unit has an input end connectable to a direct current power source for converting direct current power of the direct current power source into three-phase alternating current power;
  • the current detecting unit is connected to an output end of the auxiliary power unit, and configured to detect a current value of the three-phase alternating current output by the auxiliary power unit;
  • An output end of the current detecting unit is connected, and is used for transforming and isolating the three-phase alternating current output by the current detecting unit;
  • the filtering unit is connected in parallel on an output bus of the transformer unit, and is configured to filter the three-phase AC power to output a three-phase quasi-sinusoidal voltage;
  • the output voltage detecting unit is connected to the output end of the voltage transforming unit, and is configured to perform full-wave rectification on the three-phase sinusoidal electric power, and generate a voltage feedback signal to be sent to the auxiliary control unit;
  • the auxiliary control unit is configured to receive the voltage feedback signal, generate a trigger pulse signal through voltage closed-loop control, and control the three-phase alternating current with stable output voltage of the auxiliary power unit.
  • auxiliary converter as described above, the auxiliary control unit comprising a core processor and peripheral devices;
  • the core processor includes a digital signal processor, a complex programmable logic device, and a memory;
  • the peripheral device includes a limiter, an integrator, a frequency-voltage converter, an output characteristic controller, a proportional integrator, and a pulse generator that are sequentially connected;
  • the proportional integrator is configured to receive a given value of the modulation voltage and the voltage feedback signal, and output a modulation ratio;
  • the pulse generator is configured to receive the modulation ratio, issue a pulse signal, and control the output of the auxiliary power unit Voltage stable three-phase AC.
  • the auxiliary power unit includes an IGBT module, a driving circuit module, a water-cooled substrate, and a composite busbar;
  • the IGBT module and the driving circuit module are mounted on the water-cooled substrate, and the water-cooled substrate is used for dissipating heat of the IGBT module;
  • the composite busbar is used to implement electrical connection of the IGBT module and the driver circuit module.
  • the output voltage detecting unit includes a full-wave rectifying module and a DC voltage detecting module;
  • the full-wave rectification module is connected to an output end of the transformer unit for converting the three-phase quasi-sinusoidal electric power into direct current power;
  • the auxiliary converter converts the direct current power into three-phase alternating current through the auxiliary power unit, and the transformer unit and the filtering unit step-down and filter the three-phase alternating current and output the three-phase quasi-sinusoidal power to supply the auxiliary load, and the output voltage is detected.
  • the unit performs full-wave rectification on the three-phase quasi-sinusoidal electric power, and generates a voltage feedback signal to be sent to the auxiliary control unit.
  • the auxiliary control unit generates a variable modulation ratio according to the voltage feedback signal, and controls the auxiliary power unit to output a stable three-phase alternating current. When the intermediate voltage or load fluctuates, the modulation ratio produces a corresponding change, which keeps the output voltage stable and avoids damage to the auxiliary converter and load.
  • FIG. 1 is a schematic diagram of an auxiliary converter according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of a voltage closed-loop control of an auxiliary converter according to a first embodiment of the present invention. detailed description
  • the current detecting unit 2 is connected to the output of the auxiliary power unit 1 for detecting the current value of the three-phase alternating current output from the auxiliary power unit 1.
  • the transformer unit 3 is used for transforming and isolating the three-phase alternating current outputted by the current detecting unit 2; the transformer unit 3 can use a three-phase transformer to step down the three-phase alternating current output of the auxiliary power unit 1. At the same time, the isolation of the output side and the output side circuit of the transformer unit 3 is realized.
  • the three-phase AC output from the auxiliary power unit 1 is a three-phase square wave signal.
  • the filtering unit 4 is configured to filter the three-phase alternating current to output a three-phase quasi-sinusoidal voltage; the filtering unit 4 suppresses the harmonic partial flow in the three-phase square wave signal output by the auxiliary power unit 1, and outputs a three-phase quasi-sinusoidal electric power.
  • the output voltage detecting unit 5 is for full-wave rectifying the three-phase quasi-sinusoidal electric power, and generates a voltage feedback signal to be transmitted to the auxiliary control unit 6.
  • the auxiliary control unit 6 is configured to receive a voltage feedback signal, generate a trigger pulse signal through voltage closed-loop control, and control the auxiliary power unit 1 to output a three-phase alternating current with stable voltage.
  • the core processor includes a digital signal processor (DSP), a Complex Programmable Logic Device (CPLD), and a memory.
  • DSP digital signal processor
  • CPLD Complex Programmable Logic Device
  • FIG. 2 is a schematic diagram of voltage closed-loop control of an auxiliary converter according to an embodiment of the present invention.
  • the peripheral device includes a limiter 11 connected in sequence, an integrator 12, a frequency-to-voltage converter 13, an output characteristic controller 14, a proportional integrator 15, and a pulse generator 16.
  • Limiter 11 is used to define a given frequency of the frequency; integrator 12 is used to define the rate of rise of a given frequency; frequency converter 13 is used to convert the frequency reference to a voltage reference; output characteristic controller 14 is used Outputting a set value of the modulation voltage; the proportional integrator 15 is configured to receive a given value of the modulated voltage and the feedback voltage signal, and output a modulation ratio; the pulse generator 16 is configured to receive the modulation ratio, issue a pulse signal, and control the auxiliary power unit 1 Output voltage stable three-phase AC.
  • the transformer unit 3 is a three-phase transformer.
  • the primary side of the three-phase transformer is connected to the output of the current detecting unit 2, and the secondary side of the three-phase transformer is connected in parallel with the filtering unit 4.
  • the filtering unit 4 includes three sets of capacitors; each set of capacitors is respectively connected in parallel to the secondary side AC bus of the three-phase transformer; the transformer and the capacitor are connected by a copper bus.
  • the output voltage detecting unit 5 includes a full-wave rectifying module and a DC voltage detecting module; the full-wave rectifying module is connected to the output end of the transforming unit 3, and is configured to convert the three-phase quasi-sinusoidal electric power into a direct current; the one end of the direct current voltage detecting module It is connected to the full-wave rectifier module, and the other end is connected to the auxiliary control unit 6, for detecting the voltage of the direct current and providing a voltage feedback signal to the auxiliary control unit 6.
  • the working process of the auxiliary converter provided in this embodiment is as follows.
  • the frequency reference is subjected to input frequency limiting by the limiter 11, and then the given rising rate is defined by the integrator 12, and the frequency is given by the frequency converter 13
  • the conversion is made to a voltage reference, and then the output characteristic controller 14 outputs a given value of the modulation voltage, and the set value of the modulation voltage and the voltage feedback signal are output to the modulation ratio required by the pulse generator through the proportional integrator 15.
  • the modulation ratio is decreased, and the voltage amplitude of the output of the auxiliary power unit 1 is decreased; conversely, the output voltage of the auxiliary power unit 1 is increased. Therefore, when the intermediate voltage or load fluctuates, the modulation ratio changes, but the output voltage remains stable, avoiding damage to the auxiliary converter and load.
  • the above control process can be implemented by the DSP and CPLD processors in the auxiliary control unit 6 and the loaded software.
  • the auxiliary converter provided by the embodiment of the invention converts the DC power into three-phase AC power through the auxiliary power unit 1, and the transformer unit 3 and the filtering unit 4 step-down filter the three-phase AC power and output the three-phase quasi-sinusoidal power as the auxiliary load.
  • the power supply, output voltage detecting unit 5 performs full-wave rectification on the three-phase quasi-sinus electric power, and generates a voltage feedback signal to be sent to the auxiliary control unit 6, and the auxiliary control unit 6 receives the voltage feedback signal to generate a variable modulation ratio, and controls the auxiliary power unit 1 Output stable three-phase AC.
  • the modulation ratio produces a corresponding change, which can keep the output voltage stable.

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

Abstract

一种辅助变流器，包括辅助功率单元（1）、电流检测单元（2）、变压单元（3）、滤波单元（4）、输出电压检测单元（5）和辅助控制单元（6）。辅助功率单元具有能与直流电源连接的输入端，用于将直流电源的直流电转换为三相交流电。变压单元用于将电流检测单元输出的三相交流电变压并隔离。滤波单元并联在变压单元的输出母线上，用于对三相交流电进行滤波，以输出三相准正弦电压。输出电压检测单元用于对三相准正弦电进行全波整流，并产生电压反馈信号传送给辅助控制单元。辅助控制单元用于接收电压反馈信号，通过电压闭环控制产生触发脉冲信号，控制辅助功率单元输出电压稳定的三相交流电。该辅助变流器采用电压闭环控制，能够输出稳定的三相交流电。

Description

辅助变流器
技术领域
本发明涉及变流器技术， 尤其涉及一种辅助变流器， 属于电气技术领 域。 背景技术
电力机车的辅助变流器是将直流电源转换成交流电源， 为电力机车上 的交流负载设备供电的电气元件。
现有辅助变流器釆用开环控制， 包括控制模块和功率模块。 釆用调压调 频的控制方式， 具体通过改变脉冲宽度调制 （ Pulse Width Modulation , 简称 PWM)输出的调制比来调节电压， 通过改变 PWM输出波形的频率来改变输出 电压的频率。 当给定某一 PWM输出波形的频率值时， 计算出相应调制比， 并 保持不变， 输出的基波电压保持恒定。
在实际应用中， 由于交流负载的频繁切换以及输入直流母线电压的波 动， 会造成交流负载的很大变化， 进而引起辅助变流器输出电压的变化。 由于现有的辅助变流器釆用调制比恒定方式， 不能保证交流负载电压的稳 定， 若辅助变流器输出电压超过设计的上限值， 会造成辅助变流器和交流 负载的损坏。 发明内容
本发明提供一种辅助变流器， 用于解决现有技术中辅助变流器输出电 压不稳定， 容易造成辅助变流器和交流负载设备损坏的技术缺陷。
本发明提供的一种辅助变流器， 包括辅助功率单元、 电流检测单元、 变压单元、 滤波单元、 输出电压检测单元和辅助控制单元；
所述辅助功率单元具有能与直流电源连接的输入端， 用于将直流电源 的直流电转换为三相交流电；
所述电流检测单元与所述辅助功率单元的输出端连接， 用于检测所述 辅助功率单元输出的三相交流电的电流值； 所述变压单元的输入端与所述 电流检测单元的输出端连接， 用于将所述电流检测单元输出的三相交流电 变压并隔离；
所述滤波单元并联在所述变压单元的输出母线上， 用于对所述三相交 流电进行滤波， 以输出三相准正弦电压；
所述输出电压检测单元与所述变压单元的输出端连接， 用于对所述三 相准正弦电进行全波整流， 并产生电压反馈信号传送给所述辅助控制单 元；
所述辅助控制单元用于接收所述电压反馈信号， 通过电压闭环控制产 生触发脉冲信号， 控制所述辅助功率单元输出电压稳定的三相交流电。
如上所述的辅助变流器， 所述辅助控制单元包括核心处理器和***设 备；
所述核心处理器包括数字信号处理器、 复杂可编程逻辑器件和存储 器；
所述***设备包括依次连接的限幅器、 积分器、 频压变换器、 输出特 性控制器、 比例积分器和脉冲发生器；
所述限幅器用于限定频率给定的幅度； 所述积分器用于限定给定频率 的上升率； 所述频压变换器用于将所述频率给定转化为电压给定； 所述输 出特性控制器用于输出调制电压的给定值；
所述比例积分器用于接收所述调制电压的给定值和所述电压反馈信 号， 并输出调制比； 所述脉冲发生器用于接收所述调制比，发出脉冲信号， 控制所述辅助功率单元输出电压稳定的三相交流电。
如上所述的辅助变流器， 所述辅助功率单元包括 IGBT模块、驱动电路 模块、 水冷基板和复合母排；
所述 IGBT模块和驱动电路模块安装在所述水冷基板上， 所述水冷基 板用于对所述 IGBT模块进行散热；
所述复合母排用于实现所述 IGBT模块和所述驱动电路模块的电气连 接。
如上所述的辅助变流器， 所述变压单元为变压器， 所述变压器的原边 与所述电流检测单元连接， 所述变压器的副边与所述输出电压检测单元连 接。 如上所述的辅助变流器， 所述滤波单元包括三组电容器； 每组电容器 分别并联在所述变压器的副边交流母线上；
所述变压器和所述电容器通过铜排连接。
如上所述的辅助变流器， 所述输出电压检测单元包括全波整流模块和 直流电压检测模块；
所述全波整流模块与所述变压单元的输出端连接， 用于将所述三相准 正弦电转换为直流电；
所述直流电压检测模块一端与所述全波整流模块连接， 另一端与所述 辅助控制单元连接， 用于检测所述直流电的电压并向所述辅助控制单元提 供电压反馈信号。
本发明提供的辅助变流器， 通过辅助功率单元将直流电源转换成三相 交流电， 变压单元和滤波单元将三相交流电降压滤波并输出三相准正弦电 为辅助负载供电， 输出电压检测单元对三相准正弦电进行全波整流， 并产 生电压反馈信号传送给辅助控制单元， 辅助控制单元根据电压反馈信号产 生可变的调制比， 控制辅助功率单元输出稳定的三相交流电。 当中间电压 或负载波动时， 调制比产生相应的变化， 能够保持输出电压的稳定， 避免 辅助变流器和负载的损坏。 附图说明
图 1为本发明第一实施例提供的辅助变流器的原理图；
图 2为本发明第一实施例提供的辅助变流器的电压闭环控制原理图。 具体实施方式
参考图 1 , 图 1为本发明第一实施例提供的辅助变流器的原理图。 如图 1所示， 本发明第一实施例提供的辅助变流器， 包括辅助功率 单元 1、 电流检测单元 2、 变压单元 3、 滤波单元 4、 输出电压检测单元 5 和辅助控制单元 6。
辅助功率单元 1具有能与直流电源连接的输入端， 实际应用中， 辅助 功率单元 1的输出端与直流电源连接， 用于将直流电源的直流电转换为三 相交流电； 辅助功率单元 1输出的三相交流电为三相非正弦交流电， 可以 为三相方波电压。 辅助功率单元 1可以为绝缘栅双极型晶体管 ( Insulated Gate Bipolar Transistor, 简称 IGBT ) , 也可以为其它逆变电路模块。
电流检测单元 2与辅助功率单元 1的输出端连接， 用于检测辅助功率 单元 1输出的三相交流电的电流值。
变压单元 3用于将电流检测单元 2输出的三相交流电变压 (可以为降 压）并隔离； 变压单元 3可以釆用三相变压器， 将辅助功率单元 1输出的 三相交流电降压， 同时实现变压单元 3的输出侧和输出侧电路的隔离。 辅 助功率单元 1输出的三相交流电为三相方波信号。
滤波单元 4用于对三相交流电进行滤波， 以输出三相准正弦电压； 滤 波单元 4抑制辅助功率单元 1输出的三相方波信号中的谐波分流量， 输出 三相准正弦电。
输出电压检测单元 5用于对三相准正弦电进行全波整流， 并产生电压 反馈信号传送给辅助控制单元 6。
辅助控制单元 6用于接收电压反馈信号， 通过电压闭环控制产生触发 脉冲信号， 控制辅助功率单元 1输出电压稳定的三相交流电。
具体地， 辅助控制单元 6包括核心处理器和***设备；
核心处理器包括数字信号处理器 （Digital Signal Processing, 简称 DSP )、 复杂可编程逻辑器件（ Complex Programmable Logic Device, 简称 CPLD ) 和存储器。
参考图 2, 图 2为本发明实施例提供的辅助变流器的电压闭环控制原 理图。
如图 2所示， ***设备包括依次连接的限幅器 11、 积分器 12、 频压 变换器 13、 输出特性控制器 14、 比例积分器 15和脉冲发生器 16。
限幅器 11用于限定频率给定的幅度； 积分器 12用于限定给定频率的 上升率； 频压变换器 13用于将频率给定转化为电压给定； 输出特性控制 器 14用于输出调制电压的给定值； 比例积分器 15用于接收调制电压的给 定值和反馈的电压信号， 并输出调制比； 脉冲发生器 16用于接收调制比， 发出脉冲信号， 控制辅助功率单元 1输出电压稳定的三相交流电。
进一步地， 辅助功率单元 1包括 IGBT模块、 驱动电路模块、 水冷基板 和复合母排； IGBT模块和驱动电路模块安装在水冷基板上， 水冷基板用 于对 IGBT模块进行散热； 冷却液在水冷基板内循环流动 , 带走 IGBT模 块工作时产生的热量， 可以提高 IGBT模块的使用寿命。 复合母排用于实 现 IGBT模块和驱动电路的电气连接， 可以减少杂散电感。 辅助功率单元 1釆用模块集成技术， 能够提高辅助变流器可靠性， 便于安装和维护。
变压单元 3为三相变压器， 三相变压器的原边与电流检测单元 2输出 端连接， 三相变压器的副边与滤波单元 4并联。 滤波单元 4包括三组电容 器； 每组电容器分别并联在三相变压器的副边交流母线上； 变压器和电容 器通过铜排连接。
进一步地， 输出电压检测单元 5包括全波整流模块和直流电压检测模 块； 全波整流模块与变压单元 3的输出端连接， 用于将三相准正弦电转换 为直流电； 直流电压检测模块一端与全波整流模块连接， 另一端与辅助控 制单元 6连接， 用于检测直流电的电压并向辅助控制单元 6提供电压反馈 信号。
本实施例提供的辅助变流器的工作过程如下，频率给定通过限幅器 11 进行输入频率限幅， 再通过积分器 12限定给定上升率， 再通过频压变换 器 13将频率给定转换为电压给定， 然后通过输出特性控制器 14输出调制 电压的给定值， 调制电压的给定值与电压反馈信号通过比例积分器 15输 出脉冲发生器所需的调制比。
当电压反馈信号大于输出特性控制器 14输出的调制电压的给定值时， 调制比减小， 辅助功率单元 1输出的电压幅度降低； 反之， 辅助功率单元 1输出电压升高。 因此当中间电压或负载波动时， 调制比发生变化， 但输 出电压保持稳定， 避免辅助变流器和负载的损坏。 上述控制过程可以通过 辅助控制单元 6中 DSP和 CPLD处理器以及加载的软件共同实现。
本发明实施例提供的辅助变流器， 通过辅助功率单元 1将直流电源转 换成三相交流电， 变压单元 3和滤波单元 4将三相交流电降压滤波并输出 三相准正弦电为辅助负载供电， 输出电压检测单元 5对三相准正弦电进行 全波整流， 并产生电压反馈信号传送给辅助控制单元 6, 辅助控制单元 6 接收电压反馈信号产生可变的调制比， 控制辅助功率单元 1输出稳定的三 相交流电。 当中间电压或负载波动时， 调制比产生相应的变化， 能够保持 输出电压的稳定。 本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步 骤可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机 可读取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程 序代码的介质。
最后应说明的是： 以上各实施例仅用以说明本发明的技术方案， 而非 对其限制； 尽管参照前述各实施例对本发明进行了详细的说明， 本领域的 普通技术人员应当理解： 其依然可以对前述各实施例所记载的技术方案进 行修改， 或者对其中部分或者全部技术特征进行等同替换； 而这些修改或 者替换， 并不使相应技术方案的本质脱离本发明各实施例技术方案的范 围。

Claims

权 利 要 求 书
1、 一种辅助变流器， 其特征在于， 包括辅助功率单元、 电流检测单 元、 变压单元、 滤波单元、 输出电压检测单元和辅助控制单元；
所述辅助功率单元具有能与直流电源连接的输入端， 用于将直流电源 的直流电转换为三相交流电；
所述电流检测单元与所述辅助功率单元的输出端连接， 用于检测所述 辅助功率单元输出的三相交流电的电流值； 所述变压单元的输入端与所述 电流检测单元的输出端连接， 用于将所述电流检测单元输出的三相交流电 变压并隔离；
所述滤波单元并联在所述变压单元的输出母线上， 用于对所述三相交 流电进行滤波， 以输出三相准正弦电压；
所述输出电压检测单元与所述变压单元的输出端连接， 用于对所述三 相准正弦电进行全波整流， 并产生电压反馈信号传送给所述辅助控制单 元；
所述辅助控制单元用于接收所述电压反馈信号， 通过电压闭环控制产 生触发脉冲信号， 控制所述辅助功率单元输出电压稳定的三相交流电。
2、 根据权利要求 1所述的辅助变流器， 其特征在于， 所述辅助控制 单元包括核心处理器和***设备；
所述核心处理器包括数字信号处理器、 复杂可编程逻辑器件和存储 器；
所述***设备包括依次连接的限幅器、 积分器、 频压变换器、 输出特 性控制器、 比例积分器和脉冲发生器；
所述限幅器用于限定频率给定的幅度； 所述积分器用于限定给定频率 的上升率； 所述频压变换器用于将所述频率给定转化为电压给定； 所述输 出特性控制器用于输出调制电压的给定值；
所述比例积分器用于接收所述调制电压的给定值和所述电压反馈信 号， 并输出调制比； 所述脉冲发生器用于接收所述调制比，发出脉冲信号， 控制所述辅助功率单元输出电压稳定的三相交流电。
3、 根据权利要求 1或 2所述的辅助变流器， 其特征在于， 所述辅助功 率单元包括 IGBT模块、 驱动电路模块、 水冷基板和复合母排； 所述 IGBT模块和驱动电路模块安装在所述水冷基板上， 所述水冷基 板用于对所述 IGBT模块进行散热；
所述复合母排用于实现所述 IGBT模块和所述驱动电路模块的电气连 接。
4、 根据权利要求 1或 2所述的辅助变流器， 其特征在于， 所述变压 单元为变压器， 所述变压器的原边与所述电流检测单元连接， 所述变压器 的副边与所述输出电压检测单元连接。
5、 根据权利要求 4所述的辅助变流器， 其特征在于， 所述滤波单元 包括三组电容器； 每组电容器分别并联在所述变压器的副边交流母线上； 所述变压器和所述电容器通过铜排连接。
6、 根据权利要求 1或 2所述的辅助变流器， 其特征在于， 所述输出 电压检测单元包括全波整流模块和直流电压检测模块；
所述全波整流模块与所述变压单元的输出端连接， 用于将所述三相准 正弦电转换为直流电；
所述直流电压检测模块一端与所述全波整流模块连接， 另一端与所述 辅助控制单元连接， 用于检测所述直流电的电压并向所述辅助控制单元提 供电压反馈信号。
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