建立了软件锁相环的模型，在进行光伏或者风电机组等并网的时候，不管外界的环境怎么变化，都能够使得其跟踪电网的相位，实现稳定并网-The establishment of a software PLL model making, such as photovoltaic or wind turbine and net, regardless of how changes in the external environment, are able to make its tracking phase