1.国网江苏省电力有限公司 电力调度控制中心;2.上海电力大学 电子与信息工程学院;3.长沙理工大学 清洁能源与智能电网湖南省协同创新中心
1.Power Dispatching Control Center, State Grid Jiangsu Provincial Electric Power Corporation;2.School of Electronics and Information Engineering,Shanghai University of Electric Power;3.Clean Energy and Smart Grid Hunan Collaborative Innovation Center,Changsha University of Science and Technology
Based on the analysis of the traditional three-phase grid-connected inverter model, it is found that the use of virtual grid flux oriented control strategy can effectively reduce the additional cost of the system and greatly improve the system reliability. Based on the analysis of the traditional uncompensated flux linkage observation model, in order to solve the system error caused by the phase angle offset, the flux linkage observer model with LPF compensation is used to study the new design methods of capacitance voltage observer and grid voltage observer. In-depth study of the traditional deadbeat control and found that there is a certain degree of control delay problem. In order to solve the problem, an improved deadbeat current predictive control is proposed, which increases the sampling current at the predicted k+2 time, and has better anti-disturbance performance. Using the three-phase AC voltage sensor-free estimation strategy combined with the improved deadbeat predictive current control algorithm, the experimental results verify the effectiveness and feasibility of the proposed control strategy.