面向韧性提升的虚拟振荡器并网运行控制方法  

Resilience-enhancing Control Method for Grid-connected Virtual Oscillator

作　　者：史亚帆 许寅 吴翔宇 SHI Yafan;XU Yin;WU Xiangyu(School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《山东电力技术》2024年第8期10-17,共8页Shandong Electric Power

基　　金：国家电网有限公司科技项目(5100-202317011A-1-1-ZN)。

摘　　要：电力电子逆变器的稳态特性与暂态稳定能力极大程度由其控制方式决定。具有大扰动稳定性与快速响应能力的逆变器控制方法能够有效保障极端场景下逆变器的稳定功率输出,降低由故障引起的功率缺额,从而提升电网的韧性。虚拟振荡器控制(virtual oscillator control,VOC)是近年来新兴的构网型控制方法,相对于基于下垂的构网型控制策略具有响应速度更快、大扰动稳定性能更强等优势,但在并网运行时输出功率存在无法跟随参考值的问题,这是目前限制其工程应用的关键问题之一。文中基于庞加莱分岔方程,设计了庞加莱型虚拟振荡控制器,并给出了控制参数的设计方案;然后,基于潮流方程,实时计算满足潮流可行解的电压幅值,以此作为电压参考来实时更新控制器的输入,考虑系统全局参数难以获取的情况,设计积分控制率来对稳态误差进行补偿,使逆变器在并网运行时有功功率与无功功率均可跟随参考值;最后,基于MATLAB/Simulink软件,通过仿真算例验证了所提控制方法的有效性。The steady-state characteristics and transient stability of power electronic inverter are largely determined by its control methods.Inverter control methods with strong disturbance stability and fast response capability can effectively ensure the stable power output of inverters in fault scenarios,reducing power shortages caused by faults,and thus improve the resilience of the power grid.Virtual oscillator control(VOC)is an emerging grid-forming control method in recent years.Compared with droop-based control strategies,it has advantages such as faster response speed and stronger stability under large disturbances.However,there is a problem of output power not following the reference value during grid connected mode,which is currently one of the key issues limiting its engineering applications.Firstly,a virtual oscillator controller based on the Poincarébifurcation equation was designed,and a design scheme for control parameters was provided.Then,based on the power flow equation,the voltage amplitude that satisfies the feasible solution of the power flow was calculated,which was used as a voltage reference to update the input of the controller in real time.Considering the difficulty in obtaining system information,an integral control method was designed to compensate for steady-state errors,so that the active and reactive power of the inverter can follow the reference value during grid connected mode.Finally,the effectiveness of the proposed method was verified through simulation examples based on Matlab/Simulink.

关 键 词：韧性电网 虚拟振荡器控制 功率调度 非线性控制 逆变器控制 

分 类 号：TM464[电气工程—电器] TN752[电子电信—电路与系统]