双BUCK光伏逆变器的定频滞环电流控制研究

针对桥式电路中存在的直通问题、续流二极管的性能差所带来的功率损耗问题,提出一种双BUCK结构的逆变电路,利用定频滞环电流控制的方法,控制功率开关管的关断。通过MATLAB/SIMULINK对单相并网和三相并网仿真试验得到,双BUCK逆变电路能够实现高开关频率和系统效率,稳态和瞬态性能比传统的桥式逆变电路都有明显的改善,从而使整个光伏逆变系统更具有应用潜力。

Study of Constant-Frequency Hysteresis Current Control in PV Dual Buck Inverter

In the traditional system of photovoltaic inverter are generally used the bridge type circuit.Directed towards bridge circuit for the direct problems,the continued flow diode brought about by the poor performance of the power loss,this paper presents a new inverter circuits with BUCK by dual structure,and sets a frequency hysteresis current control methods to control the power switch on-off.Through MATLAB/SIMULINK of single-phase and three-phase grid-connected simulation and test it,double-BUCK inverter circuits can achieve high switching frequency and system efficiency,steady-state and transient performance of traditional bridge inverter circuits are obvious improved,so that the entire photovoltaic inverter system more potential applications.