基于DSP控制的光伏电池阵列模拟器的研究

Study on the Solar Array Simulator Based on DSP

针对光伏电池阵列模拟器设计中仅使用电压控制或电流控制方式引起输出电压和电流波动的问题,提出了一种复合控制策略,将光伏电池阵列I-V特性曲线以最大功率点划分为两个区域,在近似恒流源段电流控制方式有效,在近似恒压源段电压控制方式有效。MATLAB软件的仿真结果验证了基于TMS320F2812 DSP控制的光伏电池阵列模拟器系统的可行性,当负载发生变化时模拟器能够在较短时间内稳定于该负载所对应的工作点输出。采用复合控制策略能有效地减小输出电压和电流的波动,且系统稳定,动态响应快。

To solve the volatility of output voltage and current caused when solar arrays simulator is designed only by controlling voltage or current, a kind of hybrid control strategy is put forward, which divides the photovoltaic battery array I-V characteristics curve into two areas at the maximum power point, so that the current controlling is effective in the approximate constant current period while the voltage controlling is effective in the approximate constant voltage period. The simulation results of MATLAB proved the feasibility of solar array simulator system controlled by TMS320F2812 DSP, that the working point output can turn stable via simulator in a short time when load changes. The hybrid control strategy can reduce the volatility of the output voltage and current effectively, keep the system sta- ble, and make the dynamic response quickly.