弱电网下负序控制对变流器并网系统稳定性影响分析

doi:10.12204/j.issn.1000-7229.2021.03.008

电力建设 ›› 2021, Vol. 42 ›› Issue (3): 61-71.doi: 10.12204/j.issn.1000-7229.2021.03.008

弱电网下负序控制对变流器并网系统稳定性影响分析

李丹丹¹, 张爱军¹, 袁辉², 邢华栋¹, 甘青山², 辛焕海²

1.内蒙古电力(集团)有限责任公司内蒙古电力科学研究院,呼和浩特市 010020
2.浙江大学电气工程学院,杭州市 310027

收稿日期:2020-03-27 出版日期:2021-03-01 发布日期:2021-03-17
通讯作者: 袁辉
作者简介:李丹丹(1979),女,硕士,高级工程师,主要从事电力系统分析、线损分析工作|张爱军(1972),男,硕士,高级工程师,主要从事电力系统分析研究工作|邢华栋(1987),男,硕士,高级工程师,主要从事电力系统分析研究工作|甘青山(1992),男,硕士研究生,主要从事高比例可再生能源稳定分析与控制研究工作|辛焕海(1981),男,博士,教授,主要研究方向为新能源电力系统稳定分析与控制
基金资助:
内蒙古电力(集团)有限责任公司科技项目(发文号:内电科信[2019]6号)

The Impact of Negative-Sequence Control on the Stability of Grid-Connected Converter in Weak Grids

LI Dandan¹, ZHANG Aijun¹, YUAN Hui², XING Huadong¹, GAN Qingshan², XIN Huanhai²

1. Inner Mongolia Electric Power Science & Research Institute, Inner Mongolia Power (Group) Co., Ltd.,Hohhot 010020, China
2. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Received:2020-03-27 Online:2021-03-01 Published:2021-03-17
Contact: YUAN Hui
Supported by:
Science and Technology Project of Inner Mongolia Power (Group) Co., Ltd

摘要/Abstract

摘要：

变流器并网运行时,因实现负序控制目标带来的变流器控制结构改变可能会存在恶化系统小干扰稳定性问题,该问题在弱电网背景下更加突出。首先介绍了不平衡电网下基于比例积分-准谐振(proportional-integrational quasi-resonant,PIR)控制的负序控制策略,然后建立平衡电网下考虑负序控制策略的变流器并网系统幅相阻抗模型和原-对偶复电路。其次,通过分析因负序控制带来的变流器侧幅相阻抗模型中导纳元素阻抗特性的变化,判断负序控制对系统稳定性的影响,进一步基于广义阻抗判据分析了负序控制如何影响系统稳定。研究结果表明弱电网下负序控制可能会使变流器并网系统存在次同步和100 Hz左右的振荡失稳风险。最后,通过仿真验证了理论分析结果的有效性。

关键词: 变流器, 弱电网, 比例积分-准谐振(PIR)控制, 原-对偶复电路, 广义阻抗判据

Abstract:

When converters are connected to grids, the negative-sequence control (NSC) may deteriorate the system’s stability since it changes the typical PLL-based vector control, especially in weak grids. This paper analyzes this issue. Firstly, the proportional-integrational quasi-resonant (PIR) control, as one of the widely-used NSC methods, is introduced. Then, we derive the amplitude-phase impedance model and primal-dual complex circuit of the converter-connected grid for the case that the grid voltage is balanced, in which the converter applies the PIR control. Then, we analyze the impacts of the change caused by the PIR control on the admittance elements of the converter’s amplitude-phase impedance. Besides, the generalized impedance criterion is applied to analyze the impact of NSC on the system’s stability. The analysis results show that the NSC may cause the sub-synchronous oscillation issue and nearly 100 Hz oscillation issue. The simulation results verify the analysis results.

Key words: converter, weak grids, proportional-integrational quasi-resonant (PIR) control, primal-dual complex circuit, generalized impedance criterion

中图分类号:

TM715

李丹丹, 张爱军, 袁辉, 邢华栋, 甘青山, 辛焕海. 弱电网下负序控制对变流器并网系统稳定性影响分析[J]. 电力建设, 2021, 42(3): 61-71.

LI Dandan, ZHANG Aijun, YUAN Hui, XING Huadong, GAN Qingshan, XIN Huanhai. The Impact of Negative-Sequence Control on the Stability of Grid-Connected Converter in Weak Grids[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(3): 61-71.

图/表 13

图1 基于PIR控制的变流器并网系统

Fig.1 The one-line diagram of grid-connected inverter with PIR controller

图2 基于解耦双同步旋转坐标系锁相环

Fig.2 Diagram of PLL based on decoupled double synchronous reference frame

图3 系统的等效原-对偶复电路

Fig.3 Primal-dual complex circuit of the system

图4 考虑PIR控制前后变流器侧Yg11和Yg22的Bode图

Fig.4 Bode plot of Yg11 and Yg22 when considering PIR control or not

表1 变流器并网系统的参数

Table 1 Parameters of the grid-connected converter

表2 变流器并网系统最弱特征根

Table 2 Weakest eigenvalue for different cases

图5 场景1下考虑PIR前后系统开环传递函数Nyquist图

Fig.5 Nyquist plot of the system’s open-loop transfer function for case 1 when considering PIR control or not

图6 场景2下考虑PIR前后系统开环传递函数Nyquist图

Fig.6 Nyquist plot of the system’s open-loop transfer function for case 2 when considering PIR control or not

图7 特殊频段下系统谐振时等效原-对偶复电路

Fig.7 Primal-dual complex circuit for system resonance in special frequency band

图8 不平衡电网电压下有功功率对照

Fig.8 The comparison of active power under unbalanced grid voltage

图9 场景1变流器输出电流波形

Fig.9 Current output of the converter in case 1

图10 场景2变流器输出电流波形

Fig.10 Current output of the converter in case 2

图A1 系统受到扰动时系统各旋转矢量的关系

Fig.A1 Phasor positions during disturbance

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弱电网下负序控制对变流器并网系统稳定性影响分析

The Impact of Negative-Sequence Control on the Stability of Grid-Connected Converter in Weak Grids

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