电器与能效管理技术 ›› 2023, Vol. 0 ›› Issue (2): 68-73.doi: 10.16628/j.cnki.2095-8188.2023.02.013

• 电能质量 • 上一篇    下一篇

电网电压不平衡下变流器直流稳压控制策略

刘重洋, 魏亚龙, 刘刚, 范书豪, 祁招   

  1. 许继电气股份有限公司, 河南 许昌 461000
  • 收稿日期:2022-11-01 出版日期:2023-02-28 发布日期:2023-03-21
  • 作者简介:刘重洋(1988—),男,工程师,主要从事电力电子应用,新能源并网控制研究。|魏亚龙(1991—),男,工程师,主要从事变流器设计与大功率传动技术研究。|刘 刚(1972—),男,教授级高级工程师,主要从事大功率变流器系统设计与控制研究。
  • 基金资助:
    河南省重大科技专项项目(201111210400)

DC Voltage Stabilization Control Strategy of Converter Under Unbalanced Grid Voltage

LIU Chongyang, WEI Yalong, LIU Gang, FAN Shuhao, QI Zhao   

  1. XJ Electric Co.,Ltd., Xuchang 461000, China
  • Received:2022-11-01 Online:2023-02-28 Published:2023-03-21

摘要:

在电网电压不平衡工况下,变流器工作在稳压模式时直流母线电压会出现二倍频波动。针对这个问题,分析了电网电压不平衡条件下变流器稳压运行时直流母线电压二倍频波动产生机理,提出了一种基于比例积分谐振(PIR)控制器的直流稳压控制策略。在原有直流稳压控制策略的基础上,增加2次比例谐振(PR)控制,解决了现有技术无法完全避免的直流母线电压二倍频波动的问题,且无须对电流进行正负序分离及复杂的计算获取电流指令。最后,分别通过仿真和实验,验证了所提控制策略的有效性。

关键词: 电网电压不平衡, 二倍频波动, 直流稳压控制, 2次PR控制

Abstract:

Under the condition of unbalanced grid voltage,the DC bus voltage will occur the second harmonic wave when the converter works in the voltage stabilizing mode.In order to solve this problem,the mechanism of DC bus voltage second harmonic wave during voltage stabilization operation of converter under unbalanced power grid voltage is analyzed.The DC voltage stabilization control strategy based on the proportional integral resonance (PIR) controller is proposed.On the basis of the original DC voltage stabilization control strategy,the secondary proportional resonance (PR) control is added to solve the problem that the current technology can not completely avoid the second harmonic wave of the DC bus voltage.It is not necessary to separate the positive and negative sequence of the current and obtain the current command through complex calculation.Finally,the effectiveness of the proposed control strategy is verified by simulation and experiment.

Key words: unbalanced grid voltage, second harmonic wave, DC voltage control, secondary PR control

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