VSC变流器与弱电网交互作用的次同步振荡关键参数研究

杜平; 万玉良; 项颂; 朱玲; 李威; 陈璐

引用本文:	杜平,万玉良,项颂,等.VSC变流器与弱电网交互作用的次同步振荡关键参数研究[J].电力系统保护与控制,2019,47(14):44-49.
	DU Ping,WAN Yuliang,XIANG Song,et al.Study on key parameters of subsynchronous oscillation between VSC converter and weak power grid[J].Power System Protection and Control,2019,47(14):44-49

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VSC变流器与弱电网交互作用的次同步振荡关键参数研究
杜平¹,万玉良¹,项颂¹,朱玲²,李威²,陈璐¹
(1.国网内蒙古东部电力有限公司，内蒙古自治区呼和浩特 010020; 2.南瑞集团(国网电力科学研究院)有限公司，江苏南京 211106)

摘要:

电压源型变流器(VSC)接入弱同步电网后与电网交互作用显著，易引发系统次同步频带的稳定性问题。为研究这一现象的机理和特性，建立包含锁相环、电压前馈等环节的VSC变流器小信号数学模型。采用特征值分析方法进行系统振荡模态、阻尼比、相关因子计算，分析得出影响系统次同步频带稳定性的关键因素及变化规律。结果显示，增强电网网架结构，优化VSC变流器中的锁相环和电压前馈滤波参数可以减小系统振荡风险。最后通过电磁暂态仿真对上述分析结论进行了验证。

关键词: VSC变流器直驱风力发电机锁相环电压前馈控制相关因子

DOI：10.7667/PSPC180250

分类号:

基金项目:国家电网公司总部科技项目资助(526600 19000A);国网内蒙古东部电力有限公司项目“大规模风电特高压外送电网次同步振荡风险分析与防御技术研究”(SGMD0000DDJS1701168)

Study on key parameters of subsynchronous oscillation between VSC converter and weak power grid

DU Ping¹,WAN Yuliang¹,XIANG Song¹,ZHU Ling²,LI Wei²,CHEN Lu¹

(1. State Grid East Inner Mongolia Electric Power Company Limited, Hohhot 010020, China;2. NARI Group Corporation/State Grid Electric Power Research Institute, Nanjing 211106, China)

Abstract:

Voltage-source Converters (VSC) have significant interaction with the power grid after being connected to the weak synchronous grid, which easily leads to the stability problem of sub-synchronous frequency band. In order to study the mechanism and characteristics of this phenomenon, a small signal model of VSC grid connected converter containing PLL and voltage feedforward control loop is constructed. The eigenvalue analysis method is used to calculate the system oscillation modes, damping ratios, and related factors. The key factors affecting the stability and changing rules are analyzed. The results show that the system oscillation risk can be reduced by enhancing the grid structure and optimizing the phase lock loop and voltage forward feed filter parameters in the VSC converter. Finally, the analysis results are verified by electromagnetic transient simulation. This work is supported by Science and Technology Project of the Headquarter of State Grid Corporation of China (No. 52660019000A) and Fund of State Grid East Inner Mongolia Electric Power Company Limited “Study on the Risk Analysis and Defense Technology of the Subsynchronous Oscillation in Large-Scale Wind Power Transmission Grid” (No. SGMD0000DDJS1701168).

Key words: voltage source converter direct drive wind power generation phase-locked loop voltage feed-forward control correlation factor

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