基于PR控制的新型单相H5光伏并网逆变器的仿真研究

摘要

In order to improve the utilization of new energy sources,this paper proposed a new type of single-phase inverter based on H5 topology,while for the problem of poor performance of non-fundamental frequency interference about PR control on the H5 inverter,the PR(proportional resonance) controller was improved to QPR(quasi-resonant proportional) controller to overcome the grid frequency fluctuation sensitive defects of the PR control.A single-phase PV system simulation model with H5 topology in Simulink platform was built to verify the theoretical analysis and results,which show QPR can not only realize static error tracking,but also have excellent resistance to grid disturbance,and achieve a unity power factor.Finally,the simulation results verify the accuracy and feasibility of the improved control strategy,which has positive significance for improving the performance of small power inverter.%为了提高新能源的利用率,设计了一种新型单相H5逆变器拓扑结构,同时针对PR(比例谐振)控制在H5逆变拓扑上的非基波频率处抗干扰性能差的问题,将PR控制器进行改进为QPR(准比例谐振)控制,克服了PR控制对电网频率波动敏感的缺点.在Simulink平台上构建单相H5拓扑光伏发电系统仿真试验模型,结果表明QPR在H5拓扑光伏并网系统中不但能实现无静差跟踪,而且具备优良的抗电网扰动的能力,实现了单位功率因数.仿真结果验证了改进后控制策略的准确性和可行性,对提高小功率逆变器应用性能具有积极意义.