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电力系统稳定器影响频率振荡的机理及阻尼分析方法
作者:
作者单位:

1.清华大学电机工程与应用电子技术系,北京市 100084;2.电力系统及发电设备控制和仿真国家重点实验室(清华大学),北京市 100084;3.云南电力调度控制中心,云南省昆明市 650011

作者简介:

李青兰(1996—),女,硕士研究生,主要研究方向:电力系统有功频率控制过程分析。E-mail:m17888833587@163.com
黄伟(1979—),男,高级工程师,主要研究方向:电网调度。
陈磊(1982—),男,通信作者,博士,副研究员,主要研究方向:电力系统动态分析与控制。E-mail:chenlei08@ tsinghua.edu.cn

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFB0904500);云南电网有限责任公司科技项目。


Mechanism and Damping Analysis Method of Impact of Power System Stabilizer on Frequency Oscillation
Author:
Affiliation:

1.Department of Electrical Engineering, Tsinghua University, Beijing 10084, China;2.State Key Laboratory of Control and Simulation of Power System and Generation Equipments;(Tsinghua University), Beijing 100084, China;3.Yunnan Power Dispatching and Control Center, Kunming 650011, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904500) and Yunnan Power Grid Co., Ltd..

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    摘要:

    频率振荡是有功频率控制过程的小扰动稳定问题。已有研究集中于发电机调速器和原动机环节的分析。电力系统稳定器也可用于抑制频率振荡。分析了发电机励磁系统影响频率振荡的机理,当负荷具有电压调节效应时,则发电机励磁系统通过影响负荷电压进而影响负荷功率,从而对频率振荡产生影响。给出了频率偏差通过电力系统稳定器、励磁、网络、负荷等环节影响电磁功率的过程,利用阻尼转矩法计算电磁功率阻尼系数并分析了电力系统稳定器的影响。提出了多机系统中不同发电机电力系统稳定器对频率振荡阻尼影响大小的评估方法,选择影响大的发电机进行参数优化可更加有效地提高频率振荡阻尼。利用IEEE的4机2区系统对分析结论进行了仿真验证。

    Abstract:

    Frequency oscillation is a small disturbance stability problem in the active frequency control process. Previous studies have focused on the analysis of generator governors and prime movers. Power system stabilizers can also be used to suppress frequency oscillations. The effect mechanism of the generator excitation system on the frequency oscillation is analyzed. When the load has the voltage regulation effect, the generator excitation system affects the load power by the load voltage, thus affecting the frequency oscillation. The process of frequency deviation affecting electromagnetic power through power system stabilizer, excitation, network and load is given. The damping torque theory is used to calculate the electromagnetic power damping coefficient and the influence of power system stabilizer is analyzed. The evaluation method of the effect of different generator power system stabilizers on frequency oscillation damping in multi-machine system is proposed. It is more effective to improve the frequency oscillation damping by selecting the generator with large influence to optimize the parameters. The analysis results are verified by the simulation on IEEE 4-machine 2-area system.

    表 1 KZ=0时的4机2区系统仿真结果Table 1 Simulation results of 4-machine 2-area system when KZ=0
    表 3 不同TW下系统仿真结果Table 3 System simulation results with different TW
    图1 多机系统中计算频率振荡模式的系统框图Fig.1 System block diagram for calculating frequency oscillation mode in multi-machine system
    图2 系统频率偏差与负荷功率偏差关系图Fig.2 Relationship diagram between system frequencydeviation and load power deviation
    图3 各个环节传递函数的相频特性Fig.3 Phase-frequency characteristic of transfer function at each link
    图4 PSS隔直环节时间常数对频率振荡阻尼比的影响Fig.4 Impact of time constant of DC isolateion link forPSS on frequency oscillation damping ratio
    图5 不同TW下发电机G1转速偏差曲线Fig.5 G1 speed deviation curves with different TW
    表 2 KZ=0.4时的4机2区系统仿真结果Table 2 Simulation results of 4-machine 2-area system when KZ=0.4
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引用本文

李青兰,黄伟,陈磊,等.电力系统稳定器影响频率振荡的机理及阻尼分析方法[J].电力系统自动化,2020,44(1):67-73. DOI:10.7500/AEPS20190225005.
LI Qinglan,HUANG Wei,CHEN Lei,et al.Mechanism and Damping Analysis Method of Impact of Power System Stabilizer on Frequency Oscillation[J].Automation of Electric Power Systems,2020,44(1):67-73. DOI:10.7500/AEPS20190225005.

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历史
  • 收稿日期:2019-02-25
  • 最后修改日期:2019-05-23
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  • 在线发布日期: 2020-01-04
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