Research on Analytic Method of Power System Frequency Response Characteristics under Large Power Disturbance

2018 International Conference on Power System Technology (POWERCON) Pub Date : 2018-11-01 DOI:10.1109/POWERCON.2018.8602091

Xuelian Wu, Wang Jiang, Jiajia Wang, Hui Huang, Shengyi Zhu, Xiaojun Zhu

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引用次数: 2

Abstract

Frequency is one of the important indicators to measure the power quality of the power grid. Based on the characteristics of primary frequency regulation limit of the current universal electro-hydraulic governor, the output of the electro-hydraulic control system is simplified to a step response under the case of large frequency deviation. Considering the influence of the system inertia, the damping coefficient and the frequency regulation of load, an analytical model of single-system considering the governor limit of unit under large power disturbance is proposed. The analytical description of the frequency after the disturbance of large-power fault is deduced, and the influence of each key factor on the maximum frequency deviation is quantified. This analytical method enables rapid evaluation of the frequency response characteristics of the system under large power disturbances. And the validity of this analytical method is verified by the evaluation results of East China Grid after bipolar locking of Jin-Su DC transmission line.

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大功率扰动下电力系统频响特性分析方法研究

频率是衡量电网电能质量的重要指标之一。针对目前通用电液调速器一次调频极限的特点，在频率偏差较大的情况下，将电液控制系统输出简化为阶跃响应。考虑系统惯量、阻尼系数和负荷频率调节的影响，建立了考虑机组调速器极限的大功率扰动单系统解析模型。推导了大功率故障扰动后频率的解析描述，量化了各关键因素对最大频率偏差的影响。这种分析方法可以快速评估系统在大功率干扰下的频率响应特性。并以晋苏直流输电线路双极锁紧后华东电网的评价结果验证了该分析方法的有效性。

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2018 International Conference on Power System Technology (POWERCON)

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