• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2015, Vol. 36 ›› Issue (2): 74-79.doi: 10.3969/j.issn.1000-7229.2015.02.012

• 输配电技术 • 上一篇    下一篇

VSC连接弱交流电网的小扰动特性

陈文翰1,4,顾益磊2,扶达鸿3   

  1. 1. 华北电力大学,北京市 102206;2. 国网浙江省电力公司电力科学研究院,杭州市 310014;3. 浙江省送变电工程公司,杭州市 310016;4. 国网浙江省电力公司,杭州市 310007
  • 出版日期:2015-02-01
  • 作者简介:陈文翰(1986),男,本科,主要研究方向为特高压交直流输电; 顾益磊(1983),男,硕士研究生,主要研究方向为特高压交直流输电技术、柔性直流输电; 扶达鸿(1981),男,本科,主要研究方向为特高压交直流输电。

Small Disturbance Characteristics Analysis of VSC Connecting to Weak AC System

CHEN Wenhan1,4, GU Yilei 2, FU Dahong3   

  1. 1. North China Electric Power University, Beijing 102206, China;2. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China;3. Zhejiang Electric Transmission & Transformation Corporation, Hangzhou 310016, China;4. State Grid Zhejiang Electric Power Company, Hangzhou 310007, China
  • Online:2015-02-01

摘要: 主要研究电压源型换流器(voltage source converter,VSC)在弱交流电网,即低短路比电网的小扰动 特性。首先基于VSC的稳态模型,研究VSC在弱交流电网下的稳态运行特性;之后推导了包含外交流电网、VSC、 由内外环控制器构成的VSC传统矢量控制器以及锁相环 (phase locked loop,PLL)在内的VSC线性化模型;最 后研究了VSC传统矢量控制器中的内环控制器、外环控制器以及锁相环对VSC在弱交流电网中的稳定性能影响。 研究发现传统矢量控制器中的内环控制器不会对VSC在弱交流电网中的稳定性能有影响,VSC在弱交流系统中更 适宜于逆变运行模式,交流系统短路比越低,保证VSC系统稳定运行的锁相环的增益系数最大取值将越小。结果 表明在弱交流电网下,VSC控制系统的参数需要合理选取以保证基于VSC的高压直流输电系统的稳定运行。

关键词: 电压源型换流器(VSC), 低短路比弱交流电网, 小信号分析, 传统矢量控制器, 锁相环(PLL)

Abstract: This paper focused on the small disturbance characteristics analysis of voltage source converter (VSC), which was connected to low short circuit ratio (SCR) AC (weak AC) systems. First, based on the steady state model of VSC, the steady state operating characteristics of VSC in weak AC system were studied. Then the linear model of VSC was derived, including external AC system, VSC, traditional vector controller of VSC composed of inner/outer loop controller, and phase locked loop (PLL). Finally, this paper studied the impacts of the inner/outer loop controller in VSC traditional vector controller and the PLL on the stable performance of VSC in weak AC system. The research results show that the inner loop controller in traditional vector controller will not impact the stable performance of VSC in weak AC system; inverter operation mode is more suitable for VSC in weak AC system; the lower the AC SCR is, the smaller the maximum PLL gain coefficient is, which can guarantee the system stability. The results also show that: in weak AC system, the parameters of VSC control system should be selected reasonably to ensure the stable operation of VSC-HVDC.

Key words: voltage source converter (VSC), low short circuit ratio weak AC system, small signal analysis, traditional vector controller, phase locked loop (PLL)