最大化电力系统频率最低点的并网风电机组频率支撑控制  

Frequency Support Control of Grid-connected Wind Turbines to Maximize Frequency Nadir of Power Systems

作　　者：张宇博 杨松浩 郝治国[1] ZHANG Yubo;YANG Songhao;HAO Zhiguo(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049

出　　处：《电力系统自动化》2024年第8期141-151,共11页Automation of Electric Power Systems

基　　金：国家自然科学基金青年基金资助项目(52007143);中国博士后科学基金面上项目(2021M692526)。

摘　　要：为提高电力系统遭受大扰动后的频率稳定性,风电机组需具有主动频率支撑的能力。然而,现有的风机频率支撑控制大多直接模仿同步发电机的惯量及调频特性,未能充分发挥风机控制的灵活性。针对这一问题,从提升系统频率最低点这一核心需求出发,提出一种考虑系统一次调频特性的风机最优频率支撑控制。首先,以最大化频率最低点为控制目标,提出并严格证明了系统频率最优轨迹的通用形态。然后,构建了风机能量回收特性的定量表达,并以此为基础,结合系统频率响应模型逆向推导了风机的最优频率支撑控制。最后,仿真和对比验证表明,所提方法通过与系统原有的调频特性协同,从而显著提升了频率最低点,且对不同运行工况和扰动水平均具有较好的鲁棒性。To improve the frequency stability of power systems after being subjected to a major disturbance,the wind turbine(WT)is required for the ability of active frequency support.However,the existing WT frequency support control is mostly a direct imitation of the inertia and frequency regulation characteristics of synchronous generators,which limits the control flexibility of the WT.Given this deficiency,originating from the core demand for improving the frequency nadir,an optimal frequency support control of the WT is proposed,which considers the primary frequency regulation characteristics of the system.First,with the control objective of maximizing the frequency nadir,the general form of the optimal system frequency trajectory is proposed and strictly proven.Then,the quantitative expression of the energy recovery characteristics of the WT is constructed,and the optimal frequency support control of the WT is deduced reversely by combining the system frequency response model.Finally,the simulation and comparison results demonstrate that the proposed method significantly improves the frequency nadir by cooperating with the original frequency regulation characteristics of the system,and shows better robustness to different operation conditions and power disturbance levels.

关 键 词：频率稳定 风机 频率轨迹 系统频率响应 频率最低点 

分 类 号：TM614[电气工程—电力系统及自动化]