【摘要】 提出一种新型光伏逆变器拓扑结构,其由升压电路、三相四开关逆变单元组成,可有效提高光伏发电效率、降低光伏系统成本。针对该结构逆变器提出一种新型前馈功率预测控制策略,其通过将自然环境分区后排列,然后逐一对其历史光伏最大功率进行寻优,从而确定相应的前馈功率预测值。该方法具有计算量小、运算速度快、实现简单、控制精度高、可靠性强的显著优点,可省去传统逆变器控制的直流侧电压闭环,由逆变器本身完成光伏阵列的最大功率跟踪功能,从而提高系统响应速度与可靠性。仿真与实验结果验证了所提结构和控制方法的可行性及优越性。更多还原

【Abstract】 A new structure of photovoltaic inverter with Luo-Boost circuit and three-phase four-switch units was proposed to improve the efficiency of photovoltaic power generation and reduce the cost of photovoltaic systems effectively. Accordingly, a new feedforward power predictive control strategy was brought out, which would determine the related predictive value of feedforward power through the partition and arrangement of the natural environment conditions,and then the optimization of its historical largest photovoltaic power. With small amount of calculation,fast speed, simple, high precision and reliability, the new control strategy can leave out the traditional inverter DC voltage control loop and complete the MPPT function of the photovoltaic inverter itself,so as to enhance system response speed and reliability. Both simulation and experimental results both verified the feasibility and advantage of proposed structure and control method.更多还原