一种基于H6桥单相光伏并网逆变器控制策略的研究

摘要

为使光伏并网发电系统输出高质量的电能,文章在H6逆变器拓扑的基础上,提出了PI+QPR复合控制策略,克服了QPR(准比例谐振)控制对低频直流分量抑制能力较差的缺点,解决了PI控制存在稳态误差的问题;在Simulink平台上构建仿真实验模型,结果表明新的控制策略不但能实现无静差跟踪,而且有效降低了低频直流分量,实现了单位功率因数,验证了所提出新的控制策略的准确性和可行性,在实际应用中具有很好的工程价值.%The single-phase H6 inverter has the ability to suppress the leakage current,In order to make photovoltaic grid-connected power generation system to export high quality power.On the basis of H6 bridge inverter,It presents a PI +QPR complex control strategies which not only overcomes the disadvantages of QPR (Quasi Proportional Resonance) control for low frequency DC component suppression,but also solves the problem of PI control in the presence of steady state error;Based on Simulink,the simulation model was established.The results show that the new control strategy can not only achieve the static error free tracking,and effectively reduces the frequency DC component,but also can achieve unity power factor.The accuracy and feasibility of the proposed control strategy are finally verified,In practical application,it has great engineering value.