基于灵敏度的孤网动态频率偏移峰值分析和调速系统参数优化

张刘杰; 肖仕武; 黄松柏

引用本文:	张刘杰,肖仕武,黄松柏.基于灵敏度的孤网动态频率偏移峰值分析和调速系统参数优化[J].电力系统保护与控制,2020,48(2):137-143.
	ZHANG Liujie,XIAO Shiwu,HUANG Songbai.Dynamic frequency offset peak analysis and speed control system parameter optimization of isolated networks based on sensitivity[J].Power System Protection and Control,2020,48(2):137-143

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基于灵敏度的孤网动态频率偏移峰值分析和调速系统参数优化
张刘杰¹,肖仕武¹,黄松柏²
(1.华北电力大学新能源电力系统国家重点实验室, 北京 102206;2.百色新铝电力有限公司，广西百色 533000)

摘要:

孤网在扰动下频率波动在一定范围以内，是孤网稳定运行的一个重要条件。针对含高阶调速系统的孤网，分析了零极点分布对超调量和频率偏移峰值的影响，并提出了孤网频率偏移峰值的估算表达式。在此基础上，利用特征根灵敏度方法，计算得到了零极点对调速器PI、转速测量时间常数、功率反馈时间常数、负荷前馈系数、调差系数的灵敏度幅值和相位。从机理上揭示了调速器参数对频率偏移峰值的影响关系，提出了降低频率偏移峰值的调速器参数优化方案以及保证孤网频率稳定的参数调整建议，并在PSCAD/EMTDC电磁暂态仿真软件上进行了验证。

关键词: 孤网零极点超调量频率偏移峰值灵敏度

DOI：10.19783/j.cnki.pspc.190295

分类号:

基金项目:中央高校基本业务费项目资助(2018ZD01)

Dynamic frequency offset peak analysis and speed control system parameter optimization of isolated networks based on sensitivity

ZHANG Liujie¹,XIAO Shiwu¹,HUANG Songbai²

(1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2. Baise New Aluminum Power Limited Company, Baise 533000, China)

Abstract:

The frequency fluctuation of the isolated network under disturbance is within a certain range, which is an important condition for the stable operation of the isolated network. In this paper, the influence of the zero-pole distribution on the peak value of the frequency offset is analyzed for the isolated network with high-order speed control system, and the estimation expression of the peak value of the isolated network frequency offset is given. On this basis, using the method of eigenvalue sensitivity, the sensitivity amplitude and phase of zero pole to governor PI, speed measurement time constant, power feedback time constant, load feed-forward coefficient and modulation coefficient are calculated. The influence relationship of governor parameters on the frequency offset peak is revealed. The governor parameter optimization scheme for reducing the frequency offset peak value and the parameter adjustment suggestion for ensuring the stability of the isolated network frequency are proposed and verified by PSCAD/EMTDC electromagnetic transient simulation software. This work is supported by Fundamental Research Funds for the Central Universities (No. 2018ZD01).

Key words: isolated network zero-pole overshoot frequency offset peak sensitivity

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