摘要
光伏并网逆变器的优劣对整个并网系统影响重大,介绍了光伏并网逆变器控制的基本原理。以实现更有效的光伏并网控制为目的,针对光伏并网逆变系统的非线性、固定的PID参数无法准确跟踪电网电压等问题,采用了一种模糊PID控制策略。该控制策略的优点在于能够在逆变器工作时在线对PID参数进行调节。根据并网逆变器自身特点结合专家经验,制定了模糊控制规则,该方法使控制器具有跟踪精度高,响应迅速,鲁棒性好等特点。通过仿真验证了并网逆变器控制策略的可行性,搭建了并网逆变器实验样机,实验结果证明:该控制策略能使光伏并网逆变器正常运行,具有良好的动态性能和静态性能。
The quality of grid-connected photovoltaic inverter has a great impact on the operation of power grid,so the basic control principle of grid-connected photovoltaic inverter is introduced.In order to control photovoltaic grid more effectively,a fuzzy-PID control strategy is used to solve such issues as the nonlinearity of grid-connected photovoltaic inverter and the voltage of power grid that can not be traced by fixed PID parameters.The advantage of this control strategy is that PID parameters can be regulated on-line during inverter run.According to the characteristics of the grid-connected inverter itself and expert experience,the fuzzy control rules are formulated,which makes controller have such advantages as high tracking precision,rapid response and good robustness.The simulation results verify the feasibility of the control strategy of grid-connected inverter.In addition,experimental prototype of grid-connected inverter is also built,and experimental results show that this control strategy can make grid-connected photovoltaic inverter system operate normally,and have a good dynamic and static performance.
出处
《现代电力》
北大核心
2013年第1期27-31,共5页
Modern Electric Power
关键词
光伏
并网逆变器
数字控制
模糊PID
并网电流
photovoltaic
grid-connected inverter
digital control
fuzzy-PID
grid-connected current
