摘要
对于构网风电机组,虚拟同步控制通过虚拟转子模拟同步发电机的运行原理,进而向电力系统提供惯量支撑。虽然虚拟转子转速与系统频率同步,但文中发现由于转子驱动功率的差异,永磁风电机组物理转子(风轮)实际上并不能经由虚拟转子与系统频率保持同步,使得构网风电机组在惯量支撑方面同样会出现跟网风电机组的问题,即不能向电力系统提供确定且持续的惯量支撑,特别表现在构网风电机组通常在系统频率达到极值点之前便提前结束惯量支撑。这将严重影响风电高占比电力系统的频率响应特性。为此,文中提出了非同步转子惯性时间系数的定义,并据此推导分析采用虚拟同步控制的构网风电机组惯性时间系数的时变特性。在此基础上,提出了面向构网风电机组的物理转子绑定方法,实现风电机组物理转子与系统频率步调一致的变化,使得构网风电机组能够向系统提供恒定的惯量支撑,进而改善风电高占比电力系统的频率响应特性。
For grid-forming wind turbines(WTs),virtual synchronous control provides inertia support to the power system by simulating the operation principle of synchronous generators through the virtual rotor.Although the virtual rotor speed is synchronized with the system frequency,it is found that due to differences in rotor driving power,the physical rotor(wind rotor)of permanent magnet WTs cannot actually maintain synchronization with the system frequency through the virtual rotor.As a result,grid-forming WTs also face the same problem as grid-following WTs,that is,it cannot provide definite and continuous inertia support to the power system.In particular,the inertia support of grid-forming WTs is usually terminated before the system frequency reaches the extreme point.This severely affects the frequency response characteristics of power system with high proportion of wind power.To address this issue,this paper proposes the definition of the non-synchronous rotor inertia time coefficient,under which the time-varying characteristics of the inertia time coefficient for grid-forming WTs using virtual synchronous control are analyzed.On this basis,a physical rotor binding method is proposed for grid-forming WTs to achieve consistent changes between the physical rotor speed and the system frequency,enabling grid-forming WTs to provide constant inertia support to the system and improve the frequency response characteristics of power system with high proportion of wind power.
作者
李群
殷明慧
刘昆龙
陈载宇
李强
邹云
LI Qun;YIN Minghui;LIU Kunlong;CHEN Zaiyu;LI Qiang;ZOU Yun(Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China;School of Automation,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《电力系统自动化》
北大核心
2025年第11期91-101,共11页
Automation of Electric Power Systems
基金
国家电网公司总部科技项目(5108-202218280A-2-241-XG)。
关键词
构网风电机组
惯量支撑
物理转子绑定
惯性时间系数
频率响应
grid-forming wind turbine
inertia support
physical rotor binding
inertia time coefficient
frequency response
