Oscillatory Stability Assessment of Renewable Power Systems Based on Frequency-Domain Modal Analysis

doi:10.16183/j.cnki.jsjtu.2023.358

Abstract

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

CLC Number:

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