光伏并网发电系统数字锁相技术仿真与实验研究

针对传统模拟锁相环在光伏并网发电系统应用上的不足,分析了数字锁相环在光伏并网发电系统中的应用,详细说明了数字锁相环路的工作原理及控制策略,给出了环路相关参数的设计过程,并基于Matlab进行软件仿真,针对实际电网电压有可能出现的畸变、电压突增、突减等情况,进行了相应的抗干扰测试,并在一台6 kVA的工程样机上进行了实验...

Research of DPLL for photovoltaic grid-connected power generation system

Aiming at the shortages of the use of conventional analog phase-locked loop in photovohaic grid-connected power generation system,the use of digital phase-locked loop in photovohaic grid-connected power generation system was analyzed,the working principle and control strategy were described in detail, the design process of the relevant circuit parameter was presented, and software simulation was carried out based on Matlab. For the distortion, sudden increase, sudden reduction in voltage in actual power grid, corresponding anti- jamming test was carried out in simulation. And ultimately,the control strategy on a 6 kVA experimental prototype was experimentized. Experimental results and waveforms show the validity of the scheme. Digital PLL uses digital control technology instead of conventional analog control technology, besides reducing the cost of photovoltaic grid-connected inverter,high output performance is insured. It can make the grid-connected inverter generate power to the grid with high power factor and anti-islanding protect reliably,it also can reduce the complexity in the debugging of actual system.