WO2018072761A1 - 一种整流桥动态均流控制装置及控制方法 - Google Patents

一种整流桥动态均流控制装置及控制方法 Download PDF

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WO2018072761A1
WO2018072761A1 PCT/CN2017/111132 CN2017111132W WO2018072761A1 WO 2018072761 A1 WO2018072761 A1 WO 2018072761A1 CN 2017111132 W CN2017111132 W CN 2017111132W WO 2018072761 A1 WO2018072761 A1 WO 2018072761A1
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rectifier bridge
thyristor
current
control
controller
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English (en)
French (fr)
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施一峰
韩兵
牟伟
石祥建
吴龙
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NR Electric Co Ltd
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NR Electric Co Ltd
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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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC 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
    • H02M7/217—Conversion of AC power input into DC 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
    • H02M7/219—Conversion of AC power input into DC 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 in a bridge configuration
    • 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
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC 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
    • H02M7/217—Conversion of AC power input into DC 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
    • H02M7/23—Conversion of AC power input into DC 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 arranged for operation in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
    • H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices

Definitions

  • the invention belongs to the technical field of electrical engineering, and in particular relates to a dynamic current sharing control device and a control method for a rectifier bridge.
  • the excitation system is an important part of the synchronous generator. It supplies DC current to the generator rotor to establish the rotor magnetic field.
  • the generator terminal voltage and output reactive power are adjusted by adjusting the output current of the excitation system. Therefore, the performance of the excitation system directly affects the operating characteristics of the generator, and the excellent excitation system can ensure reliable and stable operation of the generator.
  • the excitation system usually consists of three parts: regulation, rectification and demagnetization.
  • the rectification part is usually composed of a plurality of thyristor rectifier bridges in parallel.
  • the output current of each rectifier bridge is not exactly the same due to the difference between the bridges.
  • these differences include thyristor on-state voltage drop, fast-blow resistance, loop impedance, and so on.
  • the load of the parallel rectifier bridge is not uniform, which is manifested by the uneven current load of the thyristors connected in parallel with each bridge arm.
  • the long-term heavy-duty thyristor will greatly shorten its service life. When it reaches its service life, the thyristor will be out of operation, which will lead to an increase in the remaining thyristor load and accelerate the aging of the remaining thyristor. Speed, bringing a chain reaction.
  • the purpose of this technology is to make the current load of the parallel rectifier bridge as uniform as possible.
  • the commonly used current sharing method mainly focuses on the impedance between the balance loops, mainly through the method of thyristor parameter matching, loop circuit equalization, loop series reactor, etc., wherein the thyristor parameters will change during operation, and the current sharing The effect cannot be guaranteed; the equal circuit line can only achieve impedance matching through different cable lengths when the cable is connected, but the large unit usually uses copper busbar connection; the loop series reactor is installed on the DC side of each rectifier bridge.
  • the object of the present invention is to provide a rectifier bridge dynamic current sharing control device and a control method thereof, which utilize digital current sharing technology to realize current sharing between the rectifier bridge arms and the parallel thyristors.
  • the solution of the present invention is:
  • a rectifier bridge dynamic current sharing control device comprises a regulator and at least two groups of control objects, each group control object comprises a rectifier bridge controller, a rectifier bridge and a current sensor, wherein the input end of the current sensor is connected with the rectifier bridge, The output of the current sensor is connected to the input of the rectifier bridge controller; the regulator is connected to the rectifier bridge controller of all control objects.
  • the above current sensor is mounted on the three-phase AC input side of the rectifier bridge.
  • the output of the current sensor is connected to the analog sampling input interface of the rectifier bridge controller.
  • the rectifier bridge controllers of the above control objects are connected by an optical fiber or a network cable.
  • the rectifier bridge controllers of the above control objects are connected by a CAN communication network.
  • the above regulator is connected to the rectifier bridge controller in all control objects through an optical fiber or a network cable.
  • a method for dynamic current sharing control of a rectifier bridge includes the following steps:
  • the regulator sends the total control angle to each rectifier bridge controller
  • the rectifier bridge controller samples the analog signal sent by the current sensor, and calculates an average current flowing through each thyristor in the rectifier bridge;
  • the rectifier bridge controller in each control object obtains the average thyristor current of all the rectifier bridges running in parallel, so that the information acquired by each rectifier bridge controller is equal;
  • the rectifier bridge controller uses the average current of all the parallel thyristors of each bridge arm to perform digital current sharing calculation, obtains the control angle offset of the bridge arm thyristor, and controls the adjustment of the control angle offset. Speed and output amplitude, the control angle offset is superimposed on the total control angle sent by the regulator to obtain an actual trigger angle of the bridge arm thyristor;
  • the rectifier bridge controller automatically recognizes the rectifier bridge exit and the bridge arm thyristor exit. When the bridge arm is partially disconnected from the thyristor, the parallel current thyristor is automatically equalized;
  • Each of the rectifier bridge controllers performs the above steps A to E, so that the thyristor output currents of the parallel operation tend to be uniform.
  • the present invention has the following advantages:
  • the current sharing algorithm is robust, and the characteristics of the thyristor device will change after long-term use. This method can overcome the influence of this difference and achieve better current sharing effect under any circumstances.
  • the current sharing coefficient is better than 0.95.
  • the rectifier bridge controller exchanges data through the communication medium, and the information obtained by each device is equal, realizing the independent current sharing, and the reliability is greatly improved without the need of regulator or external intervention.
  • the rectifier bridge controller can automatically recognize the rectifier bridge exit and the bridge arm thyristor exit. When the bridge arm is partially disconnected from the thyristor, it can automatically automatically balance the remaining normal operation of the parallel thyristor.
  • Figure 1 is a diagram showing the overall structure of a control device of the present invention.
  • the present invention provides a rectifier bridge dynamic current sharing control device, including a regulator 1 and at least two groups of control objects, which are respectively introduced below.
  • Each set of control objects includes a rectifier bridge controller 2, a rectifier bridge 3 and a current sensor 4, wherein an input of the current sensor 4 is connected to the rectifier bridge 3 for collecting current flowing through the rectifier bridge 3; the current sensor The output end of 4 is connected to the analog sampling input interface of the rectifier bridge controller 2, and the collected current analog quantity signal is sent to the rectifier bridge controller 2 for calculation.
  • the current sensor is installed on the three-phase AC input side of the rectifier bridge, specifically, a shunt meter is installed on the AC three-phase inlet of the rectifier bridge, and the main circuit is high-current through the high-voltage isolation transmitter. The signal is converted into a small signal and sent to the analog sampling input interface of the rectifier bridge controller for sampling.
  • Each rectifier bridge 3 is provided with a rectifier bridge controller 2, and the rectifier bridge controllers of all control objects are connected by a communication medium such as an optical fiber or a network cable.
  • a communication medium such as an optical fiber or a network cable.
  • the connection can be made through a CAN communication network.
  • the regulator 1 is connected to the rectifier bridge controller 2 among all the control objects, and the regulator and the rectifier bridge controller are connected by a communication medium such as an optical fiber or a network cable.
  • the present invention also provides a method for controlling a dynamic current sharing of a rectifier bridge, comprising the following steps:
  • the regulator performs optical fiber communication with each rectifier bridge controller, and sends a total control angle to each rectifier bridge controller as a reference angle for current sharing adjustment of the rectifier bridge controller;
  • the rectifier bridge controller samples the analog signal sent by the current sensor, and calculates the average current flowing through each thyristor in the rectifier bridge by using the AC side current;
  • All rectifier bridge controllers are connected through the CAN communication network. Each rectifier bridge controller receives 6 controllable silicon average currents to other devices and receives 6 controllable switches of all other rectifier bridge controllers. The average silicon current, so that each rectifier bridge controller can get the average of six thyristors of all rectifier bridges running in parallel. The information obtained by each rectifier bridge controller is equivalent and is responsible for its own current sharing control.
  • the rectifier bridge controller After obtaining the average current of all the parallel thyristors of each bridge arm, the rectifier bridge controller performs digital current sharing calculation to obtain the current reference value of each bridge arm thyristor itself, and the reference value and the actual thyristor The deviation of the current measurement is adjusted by PI to calculate the control angle offset of the bridge arm thyristor. The control angle offset is superimposed on the total control angle sent by the regulator to obtain the actual trigger angle of the bridge arm thyristor. Since the current sharing adjustment belongs to the additional control, it is necessary to control the adjustment speed and the output amplitude to avoid affecting the control characteristics of the regulator main ring.
  • the rectifier bridge controller can automatically recognize the rectifier bridge exit and the bridge arm thyristor exit. When the bridge arm is partially disconnected from the thyristor, it can automatically average the remaining normal operation of the parallel thyristor, and calculate New bridge arm thyristor current reference. The entire current sharing control process is performed autonomously by the rectifier bridge controller without external intervention.
  • Each of the rectifier bridge controllers performs the above steps A to E, so that the thyristor output currents of the parallel operation tend to be uniform.

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

Abstract

一种整流桥动态均流控制装置及方法。该装置包括调节器（1）和至少二组控制对象，每一组控制对象均包括整流桥控制器（2）、整流桥（3）和电流传感器（4）。电流传感器的输入端与整流桥连接，电流传感器的输出端与整流桥控制器的输入端连接。调节器与所有控制对象中的整流桥控制器连接。该装置利用数字均流技术，实现整流桥桥臂并联可控硅间的均流。

Description

一种整流桥动态均流控制装置及控制方法 技术领域
本发明属于电气工程技术领域，特别涉及一种整流桥动态均流控制装置及控制方法。
背景技术
励磁系统是同步发电机的重要组成部分，它向发电机转子提供直流电流以建立转子磁场，通过调节励磁系统的输出电流来调节发电机机端电压和输出无功功率。因此，励磁系统的性能直接影响发电机的运行特性，优良的励磁系统可以保证发电机可靠稳定运行。
励磁系统通常由调节、整流和灭磁三部分组成，其中整流部分通常由多个可控硅整流桥并联组成，机组容量越大，并联的数量越多。多个整流桥并联运行时，由于桥之间的差异导致每个整流桥输出电流不是完全相同。通常这些差异包括可控硅元件通态压降、快熔电阻、回路阻抗等。并联整流桥负荷不均等，表现为每个桥臂并联可控硅的电流负荷不均等。其中长期重负荷的可控硅，其使用寿命会大大缩短，当达到其使用寿命时，该可控硅退出运行，这样会导致剩余的可控硅负荷加大，又加速剩余可控硅的老化速度，带来连锁反应。
均流技术即为解决这一问题而提出，该技术的目的是尽量使并联整流桥带的电流负荷一致。常用的均流方法主要着眼于平衡回路间的阻抗，主要通过可控硅参数匹配、回路线路均等、回路串接电抗器等方法实现，其中，可控硅参数在运行期间会发生变化，均流效果无法保证；同路线路均等只有在电缆连接的情况下通过不同电缆长度实现阻抗匹配，但是大型机组通常采用铜排连接；回路串接电抗器是在每个整流桥的直流侧加装可调电抗器，但是安装繁琐，占用柜体空间，而且回路参数在使用期间会变化，经过一段时间需要重新调整。而且上述几种均流技术只能实现整流桥输出间的均流，无法对桥臂并联可控硅间实现均流。
发明内容
本发明的目的，在于提供一种整流桥动态均流控制装置及控制方法，其利用数字均流技术，实现整流桥桥臂并联可控硅间的均流。
为了达成上述目的，本发明的解决方案是：
一种整流桥动态均流控制装置，包括调节器和至少二组控制对象，每一组控制对象均包括整流桥控制器、整流桥和电流传感器，其中，电流传感器的输入端与整流桥连接，电流传感器的输出端与整流桥控制器的输入端连接；调节器与所有控制对象中的整流桥控制器连接。
上述电流传感器安装在整流桥的三相交流输入侧。
上述电流传感器的输出端连接整流桥控制器的模拟量采样输入接口。
上述各控制对象的整流桥控制器之间通过光纤或网线进行连接。
上述各控制对象的整流桥控制器之间通过CAN通讯网络进行连接。
上述调节器与所有控制对象中的整流桥控制器之间通过光纤或网线进行连接。
一种整流桥动态均流控制方法，包括如下步骤：
A、调节器将总控制角度发送给每个整流桥控制器；
B、整流桥控制器采样电流传感器送来的模拟量信号，计算出整流桥中每个可控硅流过的平均电流；
C、各控制对象中的整流桥控制器获得所有并列运行的整流桥的可控硅平均电流，使得每个整流桥控制器获取的信息对等；
D、整流桥控制器利用每个桥臂所有并联可控硅的平均电流，进行数字均流计算，得到该桥臂可控硅的控制角偏移量，同时控制该控制角偏移量的调节速度和输出幅值，将该控制角偏移量叠加到调节器发送来的总控制角度，得到该桥臂可控硅的实际触发角度；
E、整流桥控制器自动识别整流桥退出和桥臂可控硅退出，当桥臂并联可控硅中有部分退出时，自动对剩余正常运行的并联可控硅进行均流；
F、每个整流桥控制器均执行上述A～E步骤，从而使并列运行可控硅输出电流趋于一致。
采用上述方案后，本发明具有以下优点：
(1)实现元件级均流，使桥臂每个并联可控硅发热量均衡，更符合均流定义，优于整流桥输出正负极之间的均流；
(2)均流算法具有鲁棒性，可控硅器件在长期使用后的特性会有所改变，本方法能克服这种差异带来的影响，在任何情况下实现较好的均流效果，均流系数优于0.95。
(3)整流桥控制器之间通过通讯介质交换数据，每个装置获得的信息对等，实现自主均流，无需调节器或外部干预，可靠性大大提高。
(4)整流桥控制器能自动识别整流桥退出和桥臂可控硅退出，当桥臂并联可控硅中有部分退出时，能自动对剩余正常运行的并联可控硅进行自动均流。
附图说明
图1是本发明控制装置的整体架构图。
具体实施方式
以下将结合附图，对本发明的技术方案进行详细说明。
如图1所示，本发明提供一种整流桥动态均流控制装置，包括调节器1和至少二组控制对象，下面分别介绍。
每一组控制对象均包括整流桥控制器2、整流桥3和电流传感器4，其中，电流传感器4的输入端与整流桥3连接，用于采集流经整流桥3的电流；所述电流传感器4的输出端与整流桥控制器2的模拟量采样输入接口连接，将采集的电流模拟量信号送入整流桥控制器2进行计算。在本实施例中，将电流传感器安装在整流桥的三相交流输入侧，具体是在整流桥的交流三相进线均安装一个分流计，通过高耐压隔离变送器将主回路大电流信号转换成小信号送给整流桥控制器的模拟量采样输入接口进行采样。
每个整流桥3均配置一个整流桥控制器2，所有控制对象的整流桥控制器之间通过光纤、网线等通讯介质进行连接，在本实施例中，可通过CAN通讯网络进行连接。
调节器1与所有控制对象中的整流桥控制器2连接，调节器与整流桥控制器之间通过光纤、网线等通讯介质进行连接。
基于以上控制装置，本发明还提供一种整流桥动态均流控制方法，包括如下步骤：
A、调节器与每个整流桥控制器进行光纤通讯，将总控制角度发送给每个整流桥控制器，作为整流桥控制器进行均流调节的基准角度；
B、整流桥控制器采样电流传感器送来的模拟量信号，利用交流侧电流计算出整流桥中每个可控硅流过的平均电流；
C、所有的整流桥控制器通过CAN通讯网络连接在一起，每个整流桥控制器在向其它装置发送自身6个可控硅平均电流的同时，接收其它所有整流桥控制器的6个可控硅平均电流，这样每个整流桥控制器均能获得所有并列运行的整流桥的6个可控硅平均电流。每个整流桥控制器获取的信息对等，负责自身的均流控制。
D、整流桥控制器获得每个桥臂所有并联可控硅的平均电流后，进行数字均流计算，得到每个桥臂可控硅自身的电流参考值，该参考值与该可控硅实际电流测量值的偏差经过PI调节，计算出桥臂可控硅的控制角偏移量。将该控制角偏移量叠加到调节器发送来的总控制角度，便得到该桥臂可控硅的实际触发角度。由于均流调节属于附加控制，需要控制其调节速度和输出幅值，避免影响调节器主环控制特性。
E、整流桥控制器能自动识别整流桥退出和桥臂可控硅退出，当桥臂并联可控硅中有部分退出时，能自动对剩余正常运行的并联可控硅进行均流，计算出新的桥臂可控硅电流参考值。整个均流控制过程由整流桥控制器自主进行，无需外部干预。
F、每个整流桥控制器均执行上述A～E步骤，从而使并列运行可控硅输出电流趋于一致。
以上实施例仅为说明本发明的技术思想，不能以此限定本发明的保护范围，凡是按照本发明提出的技术思想，在技术方案基础上所做的任何改动，均落入本发明保护范围之内。

Claims (7)

  1. 一种整流桥动态均流控制装置，其特征在于：包括调节器和至少二组控制对象，每一组控制对象均包括整流桥控制器、整流桥和电流传感器，其中，电流传感器的输入端与整流桥连接，电流传感器的输出端与整流桥控制器的输入端连接；调节器与所有控制对象中的整流桥控制器连接。
  2. 如权利要求1所述的一种整流桥动态均流控制装置，其特征在于：所述电流传感器安装在整流桥的三相交流输入侧。
  3. 如权利要求1所述的一种整流桥动态均流控制装置，其特征在于：所述电流传感器的输出端连接整流桥控制器的模拟量采样输入接口。
  4. 如权利要求1所述的一种整流桥动态均流控制装置，其特征在于：所述各控制对象的整流桥控制器之间通过光纤或网线进行连接。
  5. 如权利要求4所述的一种整流桥动态均流控制装置，其特征在于：所述各控制对象的整流桥控制器之间通过CAN通讯网络进行连接。
  6. 如权利要求1所述的一种整流桥动态均流控制装置，其特征在于：所述调节器与所有控制对象中的整流桥控制器之间通过光纤或网线进行连接。
  7. 一种整流桥动态均流控制方法，其特征在于包括如下步骤：
    A、调节器将总控制角度发送给每个整流桥控制器；
    B、整流桥控制器采样电流传感器送来的模拟量信号，计算出整流桥中每个可控硅流过的平均电流；
    C、各控制对象中的整流桥控制器获得所有并列运行的整流桥的可控硅平均电流，使得每个整流桥控制器获取的信息对等；
    D、整流桥控制器利用每个桥臂所有并联可控硅的平均电流，进行数字均流计算，得到该桥臂可控硅的控制角偏移量，同时控制该控制角偏移量的调节速度和输出幅值，将该控制角偏移量叠加到调节器发送来的总控制角度，得到该桥臂可控硅的实际触发角度；
    E、整流桥控制器自动识别整流桥退出和桥臂可控硅退出，当桥臂并联可控硅中有部分退出时，自动对剩余正常运行的并联可控硅进行均流；
    F、每个整流桥控制器均执行上述A～E步骤，从而使并列运行可控硅输出电流趋于一致。
PCT/CN2017/111132 2016-10-17 2017-11-15 一种整流桥动态均流控制装置及控制方法 Ceased WO2018072761A1 (zh)

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