发电技术 ›› 2019, Vol. 40 ›› Issue (5): 434-439.DOI: 10.12096/j.2096-4528.pgt.19055

• 新能源 • 上一篇    下一篇

电压型虚拟同步发电机控制策略下的双馈风电机组阻抗及次同步振荡特性

范丽霞1(),蔡瑞强1,张欢畅1,魏远1,田恬2,胡斌1   

  1. 1 西北电力设计院有限公司, 陕西省 西安市 710075
    2 华北电力大学电气与电子工程学院, 北京市 昌平区 102206
  • 收稿日期:2019-04-17 出版日期:2019-10-30 发布日期:2019-11-05
  • 作者简介:范丽霞(1975),女,硕士,高级工程师,主要从事电力系统规划研究方面的工作, fanlixia@nwepdi.com
  • 基金资助:
    国家重点研发计划项目(2018YFB0904000)

Impedance and Sub-synchronous Oscillation Characteristics of Doubly-fed Induction Generators with Control Strategy of Voltage Virtual Synchronous Generator

Lixia FAN1(),Ruiqiang CAI1,Huanchang ZHANG1,Yuan WEI1,Tian TIAN2,Bin HU1   

  1. 1 Northwest Electric Power Design Institute Co., Ltd., Xi'an 710075, Shaanxi Province, China
    2 School of Electrical&Electronic Engineering, North China Electric Power University, Changping District, Beijing 102206, China
  • Received:2019-04-17 Published:2019-10-30 Online:2019-11-05
  • Supported by:
    National Key Research and Development Program of China(2018YFB0904000)

摘要:

针对双馈风电机组(doubly-fed induction generators,DFIG)经串补送出系统存在次同步振荡(sub-synchronous oscillation,SSO)的问题,以电压型虚拟同步发电机(virtual synchronous generator,VSG)控制策略下的DFIG为研究对象,首先基于三相静止坐标系建立了其阻抗模型,推导了机组正、负序阻抗解析式;其次搭建了PSCAD/EMTDC模型,对理论推导阻抗特性和频率扫描结果进行了对比验证;最后基于奈奎斯特稳定判据定量分析了VSG控制策略下的DFIG经串补送出系统SSO特性,通过仿真验证了所建立模型和稳定性分析结论的正确性。研究结果为SSO的抑制提供了参考。

关键词: 双馈风电机组(DFIG), 虚拟同步发电机(VSG), 控制策略, 次同步振荡(SSO), 阻抗建模

Abstract:

Aiming at the problem that sub-synchronous oscillation (SSO) is observed in doubly-fed induction generators (DFIG) connected to series-compensated transmission system, the DFIG with control strategy of voltage virtual synchronous generator (VSG) was taken as research object. Firstly, its impedance model based on three-phase stationary coordinate system was built, and the positive and negative sequence impedance analytical formulas of DFIG were deduced. Then, the impedance model of the DFIG was built on PSCAD/EMTDC platform, and the results of theoretical derivation and frequency scanning were verified by comparison. Finally, the SSO characteristics of DFIG connected to series-compensated transmission system with control strategy of VSG was analyzed quantitatively based on Nyquist stability criterion. The correctness of the established model and stability analysis conclusion was verified by simulation. The study results provide reference for suppression of SSO.

Key words: doubly-fed induction generators (DFIG), virtual synchronous generator (VSG), control strategy, sub-synchronous oscillation (SSO), impedance modelling