基于直流附加频率控制的高水电占比电力系统超低频振荡抑制方法  

A method for suppressing ultra-low-frequency oscillations in high hydroelectric power systems based on DC additional frequency control

作　　者：赵熙临[1] 赵宇翔 李品 ZHAO Xilin;ZHAO Yuxiang;LI Pin(School of Electrical and Electronic Engineering,Hubei University of Technology,Wuhan 430068,China;Lingyun Science&Technology Group Co.,Ltd.,Dangyang 444100,China)

机构地区：[1]湖北工业大学电气与电子工程学院,湖北武汉430068 [2]凌云科技集团有限责任公司,湖北当阳444100

出　　处：《电力科学与技术学报》2025年第1期29-38,共10页Journal of Electric Power Science And Technology

基　　金：湖北省自然科学基金创新发展联合基金(2023AFD186)。

摘　　要：随着柔性直流(direct current,DC)异步互联工程相继推进,高水电占比高带来的超低频振荡问题威胁着电力系统频率的稳定。针对超低频振荡现象的发生,提出基于柔性直流输电即电压源换流器的高压直流输电(voltage source converter based high voltage direct current transmission,VSC-HVDC)系统的附加频率控制策略。首先,构建含水电、火电机组的频率响应模型,通过阻尼转矩分析揭示超低频振荡产生机理,明确各类调速器参数以及不同水电占比对系统超低频振荡发生的影响;随后,根据直流电容电压与交流系统频率耦合特性,对换流站参与抑制超低频振荡机理进行研究,提出换流站虚拟惯性与V_(DC)-f下垂的控制方式,并通过约束条件对虚拟惯性与下垂参数进行设计;最后,基于MATLAB/SIMULINK平台搭建含水电、火电机组的负荷频率控制模型,通过对比水轮机参数优化方法验证所提方法的有效性。With the continuous advancement of flexible direct current(DC)asynchronous interconnection projects,the ultra-low-frequency oscillation problem caused by the high proportion of hydropower poses a threat to the frequency stability of the power system.To suppress the occurrence of these oscillations,an additional frequency control strategy based on a flexible DC transmission is proposed,which is also referred to as a voltage source converter-based high-voltage DC transmission(VSC-HVDC)system.Firstly,a frequency response model that includes both hydro and thermal power units is constructed.The formation mechanism of ultra-low-frequency oscillation is identified through damping torque analysis,and the influence of various governor parameters and different hydropower ratios on the occurrence of ultra-low-frequency oscillations in the system is explored.Secondly,based on the coupling characteristics of DC capacitor voltage and alternating current system frequency,the mechanism of the converter station participating in suppressing ultra-low-frequency oscillation is studied.A control method for virtual inertia and VDC-f droop of the converter station is proposed,and the virtual inertia and droop parameters are designed under constraint conditions.Finally,based on the MATLAB/SIMULINK platform,a load frequency control model that includes both hydro and thermal power units is constructed,and the effectiveness of the proposed method is verified by comparing the optimization methods of water turbine parameters.

关 键 词：超低频振荡 柔性直流输电 负阻尼特性 虚拟惯性 一次调频 异步互联 

分 类 号：TM761[电气工程—电力系统及自动化]