电力系统自动化2018，Vol.42Issue(9)：91-99,9.DOI:10.7500/AEPS20171115021
虚拟同步发电机的并网功率控制及模式平滑切换
Power Control and Smooth Mode Switchover for Grid-connected Virtual Synchronous Generators
摘要
Abstract
The existing control strategies are difficult to realize the coordinated control between the constant power control and the inertia and damping support for grid-connected virtual synchronous generators(VSGs)when the power grid frequency fluctuates.To solve this problem,a PQ control mode of VSGs is proposed to achieve the steady-state constant power operation in the grid-connected state and provide the inertia support for power systems in dynamic process.Based on the comparative analysis on the power loop model of VSG and the phase-locked loop(PLL)model based on virtual power,the power loop model is designed to be a second-order system with Zero to implement the PQ control mode of VSGs under frequency disturbance of power grids while keeping synchronizing mechanism.The smooth switchover is achieved between constant active power control and frequency droop control by the parameter design and the switch between proportional-integral(PI)link and inertia link.The constant active power control mode and the frequency droop control mode are compared and analyzed from the two aspects of input and disturbance responses.Finally,the stable operation and smooth switchover performance of two modes are simulated and experimentally verified.The results show that the steady-state performance of the PQ control mode is better than that of the frequency droop mode,while the dynamic performance is weaker than that of the frequency droop mode.关键词
虚拟同步发电机/恒功率控制/惯量功率/平滑切换/下垂控制/并网逆变器Key words
virtual synchronous generator/constant power control/inertia power/smooth switchover/droop control/grid-connected inverter引用本文复制引用
颜湘武,贾焦心,王德胜,李正文,葛延峰..虚拟同步发电机的并网功率控制及模式平滑切换[J].电力系统自动化,2018,42(9):91-99,9.基金项目
国家高技术研究发展计划(863计划)资助项目(2015AA050603) （863计划）
国家电网公司科技项目(SGTYHT/16-JS-198).This work is supported by National High Technology Research and Development Program of China(863 Program)(No.2015AA050603)and State Grid Corporation of China(No.SGTYHT/16-JS-198). （SGTYHT/16-JS-198）
