MA Junchao;GAO Lei;CHEN Xiaogang;LYU Jing;PENG Yan;WANG Chenxu;LIU Jianing;

• 1:State Grid Zhejiang Electric Power Co.
• 2: Ltd.Research Institute
• 3:Key Laboratory of Control of Power Transmission and Conversion
• 4: Ministry of Education (Shanghai Jiao Tong University)

Abstract：

To mitigate the impact of oscillations on new energy power systems, it is crucial to assess the system stability state online and identify weak points susceptible to oscillations for proactive measures. To achieve this, two methods for locating weak points in new energy power systems are proposed, each from the perspectives of frequency domain characteristics and time-domain responses of the ports. The frequency domain method involves evaluating the system's stability state based on the impedance characteristics of the ports at new energy substations, pinpointing weak substations according to the magnitude of the real part of the impedance at each substation. The timedomain method involves actively injecting a wideband small disturbance signal and utilizing the HHT(HilbertHuang transform) to analyze the current response at each port of new energy substations. Damping ratios of weak modes are extracted, and weak substations are located based on their magnitudes. The effectiveness of these location methods is validated using a small-scale new energy system composed of three wind farms. The results indicate that both methods accurately identify weak points in the system oscillations.

Key Words： new energy power system;weak point location for oscillation;frequency-domain;time-domain;Hilbert-Huang transform

Abstract:

Keywords:

Foundation: 国网浙江省电力有限公司科技项目（B311DS22000K）;; 国家自然科学基金项目（52277195）

Authors: MA Junchao;GAO Lei;CHEN Xiaogang;LYU Jing;PENG Yan;WANG Chenxu;LIU Jianing;

DOI: 10.19585/j.zjdl.202403001

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