基于频域模态法的新能源电力系统振荡稳定性评估

doi:10.16183/j.cnki.jsjtu.2023.358

摘要/Abstract

摘要：

随着新能源接入比例的不断提高,电力系统的次/超同步振荡风险加剧,准确评估新能源电力系统的振荡稳定性是保障系统安全稳定运行的关键.首先,研究了一种基于频域模态分析的新能源电力系统振荡稳定性评估方法,该方法通过建立新能源机组和场站、传输线、同步机、变压器等关键设备和场站的频域阻抗或导纳模型,根据实际系统拓扑构建系统级频域网络模型.然后,通过求解回路阻抗矩阵或节点导纳矩阵行列式的零点来评估新能源电力系统的振荡稳定性,通过计算弱阻尼振荡模式的节点参与因子矩阵定位系统薄弱点,为振荡抑制措施的实施提供依据.以国内华东地区某实际新能源电力系统为例,利用频域模态分析法评估新能源接入容量和电网运行工况变化下系统的振荡稳定性.最后,利用PSCAD/EMTDC软件搭建该系统的时域仿真模型,验证了理论分析的正确性.

关键词: 新能源电力系统, 振荡稳定性, 频域网络, 频域模态分析, 稳定性评估, 薄弱点定位

Abstract:

The increasing penetration of the renewable energy has increased the risks of sub/super synchronous oscillations in power systems. Therefore, it is critical to accurately evaluate the oscillatory stability of renewable power systems ensuring the safe and stable operation of the systems. In this paper, a method for evaluating the oscillatory stability of renewable power systems based on frequency-domain modal analysis is investigated. First, the frequency-domain impedance or admittance models of key equipment and stations are established, including the renewable power generators and stations, transmission lines, synchronous generators, transformers, etc. Next, a system-level frequency-domain network model is constructed based on the actual system topology. Then, the oscillatory stability of the renewable power system is evaluated by solving the zeros of the determinant of the loop impedance matrix or the node admittance matrix of the system. The weak points of the system are identified using the participated matrix of the weak oscillation mode, which provides reference for implementation of oscillation suppression measures. Taking the practical renewable power system in East China as an example, the oscillatory stability of the system considering the varying access capacity of renewables under different grid operating conditions is assessed using the frequency-domain modal analysis method. Finally, the time-domain simulation model of the actual renewable power system is built in PSCAD/EMTDC to verify the theoretical analysis.

Key words: renewable power system, oscillatory stability, frequency-domain network, frequency-domain modal analysis, stability assessment, weak point location

中图分类号:

高磊, 马骏超, 吕敬, 刘佳宁, 王晨旭, 蔡旭. 基于频域模态法的新能源电力系统振荡稳定性评估[J]. 上海交通大学学报, 2025, 59(6): 821-835.

GAO Lei, MA Junchao, LÜ Jing, LIU Jianing, WANG Chenxu, CAI Xu. Oscillatory Stability Assessment of Renewable Power Systems Based on Frequency-Domain Modal Analysis[J]. Journal of Shanghai Jiao Tong University, 2025, 59(6): 821-835.

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工况	ZXG 风电场运行方式	振荡模态	阻尼比	振荡频率/ Hz	主导风电场
一	小开机	-2.9±j60.2	0.0420	9.58	ZXG-ZC5
二	半容量	-1.8±j59.4	0.0310	9.45	ZXG-ZC5
三	大开机	0.4±j60.4	-0.0066	9.61	ZXG-ZC5

工况	ZXG 风电场运行方式	振荡模态	阻尼比	振荡频率/ Hz	主导风电场
一	小开机	-1.8±j59.6	0.0320	9.48	ZQJ-ZC4
二	半容量	-0.3±j58.4	0.0050	9.29	ZXG-ZC5
三	大开机	1.8±j57.4	-0.0320	9.14	ZXG-ZC5

工况	ZXG 风电场运行方式	振荡模态	阻尼比	振荡频率/ Hz	主导风电场
一	小开机	-0.5±j58.4	0.0086	9.29	ZQJ-ZC4
二	半容量	2.1±j57.5	-0.0360	9.14	ZQJ-ZC4
三	大开机	6.5±j61.2	-0.1000	9.74	ZXG-ZC5

工况	线路状态	振荡模态	阻尼比	振荡频率/Hz	主导风电场
一	线路正常	-0.3±j58.4	0.00500	9.29	ZXG-ZC5
二	ZQJ-ZCB停电检修	0.19±j59.4	-0.00320	9.45	ZQJ-ZC4
三	ZQJ-ZCB停电检修ZQJ-ZQC单回线停电检修	0.53±j58.6	-0.00904	9.32	ZQJ-ZC4