基于多变量双闭环控制与同步锁相控制相结合的光伏并网控制策略研究  

Research on photovoltaic grid-connected control strategy based on multivariabledouble closed loop control and synchronous phase-locked control

作　　者：刘宇刚[1] Liu Yugang(School of Mechanical and Electrical Engineering,Guizhou Normal University,Guiyang 550025,China)

机构地区：[1]贵州师范大学机械与电气工程学院,贵州贵阳550025

出　　处：《无线互联科技》2020年第20期94-96,共3页Wireless Internet Technology

基　　金：贵州省教育厅自然科学招标项目基金资助,项目编号:黔教合KY字[20015](361号)。

摘　　要：文章指出随着电力电子技术、现代控制理论和智能控制技术的快速发展,在光伏并网控制技术方面取得了多项技术上的突破,但大规模光伏并网的调峰、调频及无功电压控制技术还需建立系统的理论体系。为了消除单独采用内环控制存在的稳态误差,在内环外增加一个多变量外环的控制方案,采用了模糊PI控制与同步锁相控制相结合的综合控制策略;为了实现并网电流和电网电压同频同相,采用了同步锁相技术,利用DSP2812灵活方便地实现光伏并网的双环控制和软件锁相环。仿真结果表明该并网控制系统工作性能稳定、抗干扰性强,提高了系统的鲁棒性。With the rapid development of power electronics technology,modern control theory and intelligent control technology,many technical breakthroughs have been made in photovoltaic grid-connected control technology,but in large-scale photovoltaic grid-connected peak-shaving,frequency modulation and reactive power voltage control technology still need to establish a systematic theoretical system.To eliminate the steady-state error of the inner loop control alone,a multi-variable outer loop control scheme is added outside the inner loop,and a comprehensive control strategy combining fuzzy PI control and synchronous phase-locked control is adopted.In order to realize the same frequency and phase-locked loop of grid current and grid voltage,synchronous phase-locked technology is adopted-loop control and software phase-locked loop of photovoltaic grid-connected flexibly and conveniently.The simulation results show that the performance of the grid-connected control system is stable,anti-interference is strong,and the robustness of the system is improved.

关 键 词：双闭环控制 同步锁相技术 光伏并网控制 DSP 

分 类 号：TM615[电气工程—电力系统及自动化]