摘要
传统虚拟同步发电机的频率控制为有差控制,且虚拟惯量的引入使得虚拟同步发电机呈现二阶振荡特性,导致孤岛微电网多虚拟同步发电机并联系统在受到负荷扰动时面临频率偏移和有功超调的问题。针对此,提出了一种多虚拟同步发电机频率无差协调控制方法。该方法包含了兼具有功精确分配的频率无差调节控制和阻尼改进控制两部分,通过利用母线频率全局一致的“通信”效果,以分散式的形式协调系统内各台虚拟同步发电机,可主动消除微电网频率稳态偏差且实现各台虚拟同步发电机按照容量承担负荷有功功率,并抑制系统的有功超调。最后,通过仿真和实验验证了所提控制方法的有效性。
The frequency control of the traditional virtual synchronous generator(VSG)is differential control,and the introduction of virtual inertia causes the VSG to exhibit a second-order oscillatory characteristic,leading to the issues of frequency deviation and active power overshoot when subjected to load disturbances in an island microgrid.To address these issues,a frequency deviation-free coordination control method for multiple VSGs is proposed,one which includes two parts:frequency deviation-free regulation control with precise active power allocation and damping improvement control.By using the“communication”effect generated from a globally consistent bus frequency,the proposed control method coordinates the various VSGs within the system in a decentralized manner,actively eliminating microgrid frequency steady-state deviation,ensuring that each VSG shares the active power load according to its capacity,and suppressing the active power overshoot.Finally,the effectiveness of the proposed control method is verified through simulation and experiment.
作者
王自力
陈燕东
李雪萍
罗聪
符有泽
王海宁
傅家骏
WANG Zili;CHEN Yandong;LI Xueping;LUO Cong;FU Youze;WANG Haining;FU Jiajun(State Key Laboratory of High-Efficiency and High-Quality Conversion for Electric Power(Hunan University),Changsha 410082,China;Hunan First Normal University,Changsha 410082,China;Shenzhen Research Institute,Hunan University,Shenzhen 518000,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2024年第7期12-23,共12页
Power System Protection and Control
基金
国家自然科学基金项目资助(52077070)
中央引导地方科技发展资金—深圳虚拟大学园自由探索类基础研究项目资助(2021Szvup038)。
关键词
虚拟同步发电机
频率偏移
无差调节
有功精确分配
有功超调
virtual synchronous generator
frequency offset
deviation-free regulation
active power sharing
active power overshoot
