Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2024 , Vol. 58 >Issue 1: 40 - 49

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2022.370

New Type Power System and the Integrated Energy

Fast Stability of New Power System Based on a PMU Gradient Dynamic Deviation Method

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  • 1. School of Mechanical-Electronic and Vehicle Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
    2. Beijing Engineering Research Center of Monitoring for Construction Safety, Beijing 100044, China
    3. State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Tsinghua University, Beijing 100084, China

Received date: 2022-09-23

  Revised date: 2022-12-08

  Accepted date: 2022-12-30

  Online published: 2023-04-27

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Abstract

The high proportion of renewable energy and power electronic equipment is emerging as a significant trend and key characteristic of the power system development driven by the dual promotion of the energy transformation and scientific technological advancement. Major modifications have been made to the dynamic behavior of the new power system. The traditional small signal stability analysis approach is difficult to apply, and there are still urgent issues to be resolved for the quick change of operating conditions. In this paper, a Lyapunov direct analysis method of gradient dynamic deviation based on phasor measurement unit (PMU) data is proposed to analyze the small signal stability of the new power system. First, the PMU data matrix is used to reduce the dimension to obtain the low dimension matrix, which is substituted into the power system matrix model with a doubly-fed induction generator (DFIG). The diagonal matrix is obtained by solving the Lyapunov equation, and the positive definiteness of the matrix is determined to judge the system stability. Then, the dynamic deviation of corresponding state variable is calculated by solving the obtained diagonal matrix. The gradient descent method is applied to the corresponding state variable curve to iterate the extreme point value of curve. The time-weighted dynamic deviation of the whole oscillation process is calculated by time weighting, which provides guidance for the subsequent configuration position of damping stability controller, i.e., power system stabilizer (PSS). The method can improve the small interference stability of the system. The effectiveness of the fast stability analysis of the new power system is verified by simulations of the new England 10-machine 39-bus system with DFIG.

Key words： phasor measurement unit (PMU) data; new power system; stability analysis; Lyapunov direct method; gradient dynamic deviation

Cite this article

YU Miao, HU Jingxuan, ZHANG Shouzhi, WEI Jingjing, SUN Jianqun, WU Yixiao . Fast Stability of New Power System Based on a PMU Gradient Dynamic Deviation Method[J]. Journal of Shanghai Jiaotong University, 2024 , 58(1) : 40 -49 . DOI: 10.16183/j.cnki.jsjtu.2022.370

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