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为构建高效且结构简单的光伏并网系统,将单周控制这一非线性控制方法用于电流内环,快速跟踪电流的同时,开关频率得以保持不变,改善了传统并网逆变系统三环控制性能。阻抗源(Z源)变换器将光伏电池板电压提升以满足并网电压条件,并实现最大功率跟踪。给出了综合以上两者的系统结构和单周控制模型,通过对电流跟踪过程的理论分析,结合MATLAB/Simulink仿真结果表明并网电流能很好地跟踪指令电流与电网电压同步。该方案通过了小功率实验验证。
In order to build an efficient and simple structure of PV grid-connected system, the non-linear control method with one-cycle control is applied to the current inner loop, while the current is rapidly tracked while the switching frequency is maintained, which improves the traditional grid- Ring control performance. Impedance source (Z source) converter to increase the voltage of photovoltaic panels to meet the grid voltage conditions, and to achieve maximum power tracking. Based on the theoretical analysis of the current tracking process and the simulation results of MATLAB / Simulink, it is shown that the grid current can keep track of the command current and grid voltage synchronously. The program passed the low-power experimental verification.