摘要
通过虚拟刚度建立储能与风电机组锁相间的弹性连接关系是高效抑制锁相环诱发次同步振荡的关键。以机械振动力学为基础,该文首先在风电机组锁相与储能虚拟同步机之间建立相位弹性耦合关系,并定义虚拟锁相刚度。其次,引入虚拟锁相刚度,建立风储弹性系统的两自由度运动模型,分析风电机组相位的幅频响应特性,并基于固定点理论,优化设计风储间整体刚度和阻尼。再次,提出虚拟锁相刚度控制策略,将其嵌入储能虚拟同步机控制系统中,并与虚拟惯量、阻尼环节构建风储弹性耦合控制系统结构。最后,搭建风储高渗透并网仿真系统,验证增设虚拟锁相刚度后,风电机组锁相环诱发的次同步振荡能够得到有效抑制,显著提升系统的稳定性。
Establishing the elastic connection between energy storage and wind turbine through virtual stiffness is the key to effectively suppress sub-synchronous oscillation induced by phase-locked loop.Based on the mechanical vibration mechanics,this paper first establishes the phase elastic coupling relationship between the phase locked of wind turbine and the virtual synchronous machine of energy storage,and defines the virtual phase-locked stiffness.Next,the virtual phase-locked stiffness is introduced to establish a two-degree-of-freedom motion model of the wind-storage elastic system,and the amplitude-frequency response characteristics of the fan phase are analyzed.Based on the fixed point theory,the virtual phase-locked stiffness and damping are optimized.Then,a virtual phase-locked stiffness control strategy is proposed,which is embedded in the energy storage virtual synchronous machine control system,and the control structure of the wind-storage elastic coupling control system is constructed with the virtual inertia and damping links.Finally,a wind-storage high-permeability grid-connected simulation system is built to verify that after adding virtual phase-locked stiffness,the sub-synchronous oscillation induced by the fan phase-locked loop can be effectively suppressed and the stability of the system can be significantly improved.
作者
张祥宇
罗程远
付媛
刘华志
ZHANG Xiangyu;LUO Chengyuan;FU Yuan;LIU Huazhi(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Baoding 071003,Hebei Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2024年第16期6507-6517,I0018,共12页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
国家自然科学基金项目(52277100)。
关键词
风电机组
储能
虚拟同步机
锁相环
虚拟锁相刚度
wind turbine generators
energy storage
virtual synchronous generator
phase-locked loop(PLL)
virtual phase-locked stiffness
