Single-stage grid-connected photovoltaic (PV) systems have many advantages, including large capacity, high efficiency and low cost. A fast current control method is required for PV power generation systems to maximize the high-quality output power.Based on the concepts of single-phase single-stage grid-connected photovoltaic system,a comparison is conducted to characterize the equivalence of deadbeat control and one cycle control which can be applied into inverters. Simulation programs for the control schemes are run in PSIM software initially to see the effect of two control method. Afterwards, a DSP control board is designed and programmed to control a 6 kW inverter. The simulation and experimental results are also provided to verify the conclusions.%单相全桥光伏并网系统具有容量大、效率高、成本低等优点.光伏并网逆变器需要一种快速电流控制方法使其能够最大限度地输出高质量的电能.分析了无差拍数字控制和单周期数字控制在单相光伏并网逆变器中的单级性调制控制算法,证明了这两种算法的等价性.基于PSIM 软件平台对控制效果进行仿真,试制了6 kW 的并网逆变器实验平台和DSP控制板.仿真和样机实验结果均证明了这两种方法的等价性结论.
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