虚拟同步发电机的相角控制方法

虚拟同步发电机技术利用电力电子变换器模拟同步发电机的特性,使变流器具有同步发电机一次调频、一次调压、阻尼及惯性等特性,增强了变流器对电网电压及频率的支撑作用,提高了电网接入的友好性。提出一种利用常规锁相环校正虚拟同步发电机频率和相位的方法,在启动并网及强扰动过程中校正频率和相位的不合理偏移,减小了上述工况下的振荡及失控风险,并通过实验验证了方法的可行性。

Phase angle control method of Virtual Synchronous Generator

Virtual synchronous generator (VSG) technology simulates the characteristics of the synchronous generator by power conversion system (PCS).Thus,the converter will have the characteristics of the synchronous generator such as primary frequency regulation,primary voltage regulation,damping and inertia.So the voltage and frequency regulation ability of converter for power grid will be enhanced.It can also help to improve the friendliness of grid-connection.In this paper,a new rectification method for phase angle and frequency of VSG based on phase locked loop (PLL) is proposed.The unreasonable deviation of frequency and phase is corrected in the process of starting grid connection and in the condition of strong disturbance,to reduce the oscillation and out-of-control risk under the above conditions.Finally,some experimental tests are given for correctness verification of the proposed method.