基于虚拟同步发电机的微网逆变器控制策略

Control Strategy of Microgrid Inverse Based on Virtual Synchronous Generator

针对基于下垂控制的微网逆变器控制方式的不足,研究了一种新的微网逆变器控制策略.该控制技术通过本体算法的实现及调速器、励磁调节器的设计,模拟了同步发电机的工作特点与控制特性,使微网逆器在孤岛与并网模式下能稳定运行,具有良好的预并列控制及功率均分控制特性,提高了微网逆变器控制的可靠性和灵活性.仿真和试验结果表明:该微网系统能根据有功与无功负荷的变动对逆变器输出电压的幅值与频率进行快速调节,以保持系统电压和频率的稳定性;同时,在逆变器孤岛状态下并联运行时,能根据逆变器容量按比例进行负荷分配,以维持系统的功率平衡,满足了微网逆变电源的控制要求.

Aiming at the deficiency of droop control,a novel microgrid inverse control strategy is proposed.Through realizing ontology algorithm and designing speed governor and excitation controller,the operation characteristics and control characteristics of synchronous generator are mimicked by this control technology.Thus the microgrid inverter can operate steadily in islanding and grid-connected mode.It has good characteristics of pre-synchronization control and power sharing control,and improves its reliability and flexibility of control.Simulation and experimental results show that,the microgrid system can quickly adjust the amplitude and frequency of inverter output voltage according to the changed active load and reactive load,so the stability of voltage and frequency is maintained;at the same time,in islanding operating mode,the load can be distributed proportionally according to the capacity of inverter to maintain the power balance of the system,so the control requirements of microgrid inverse are met.