基于DSP的光伏并网技术的研究与实现

摘要

In the system of photovoltaic grid-connected generation, the phase-locked loop （PLL） technology must be adopted to ensure the grid-connected current and the grid voltage strictly in the same frequency and phase, in order to avoid the grid pollution caused by the grid-connected current. In this paper, a new strategy for the software PLL technology is proposed, based on the hardware circuit of grid voltage zero-crossing detection. Then the experiment has been done by programming in the software of CCS3.3 and using TMS320F2812, a kind of DSP chip, as the controlling chip. The experimental results are presented to demonstrate that the grid voltage can be traced effectively by grid-connected current with the proposed strategy.%在光伏并网发电系统中,为了避免所发电能并入电网后造成电网污染,必须使用锁相环（PLL--Phase-Locked Loop）技术,保证并网电流和电网电压严格同频同相。文中针对软件锁相环技术,提出了一种基于电网电压过零检测硬件电路的新方法,并在CCS3.3软件中编写程序,以DSP芯片TMS320F2812为控制芯片进行了实验验证。实验结果表明此锁相环方案可以快速准确地使并网电流跟踪电网电压。