基于PR控制器的改进型虚拟同步发电机技术

摘要

电压控制型虚拟同步发电机技术(VSG)和电流控制型虚拟同步发电机技术是目前较主流的2种虚拟同步发电机技术.针对原有VSG技术对有功功率和无功功率的跟踪特性较差问题,提出一种改进型VSG技术.通过嵌入PR控制器,一方面可对有功功率和无功功率进行前馈补偿,以改善原有VSG的功率跟踪特性,使其能更好地适应并网,另一方面能实现在特殊情况下由改进的VSG平滑切换到原有VSG,以适应频率、电压快速变化的电网.在RT-LAB半实物仿真平台的实验验证了所提控制策略的正确性和可行性.%Virtual synchronous generator(VSG) and virtual synchronous generator of current control(VISMA) are two main virtual synchronous generators in the word at present.Traditional VSG is difficult to track active power and reactive power when the frequency or voltage magnitude of the grid fluctuates.A kind of VSG based on PR controller is proposed to improve VSG's power tracking property.It can switch to traditional VSG smoothly,and adapt the rapidly changes of frequency and voltage in power grid.The proposed control scheme has been validated for accuracy and feasibility on RT-LAB semi-physical simulation platform.