摘要
针对两级式单相光伏并网发电系统,提出一种新颖的系统控制策略。在传统的双环控制策略基础上加入功率跟踪环节,提高逆变器输出电流对前级功率输入变化时的响应速度;采用BP神经网络自整定PI控制器实现电流闭环的跟踪控制,提高系统动态性能,改善功率突变时逆变器的电流波形,提高系统运行效率。利用MATLAB/simulink对提出的控制策略进行仿真研究,结果表明该系统能可靠稳定地向电网传输电能。最后在2 k W实验样机上进行实验验证,结果证明控制策略和仿真结果的正确性。
A whole novel control strategy for two level of grid connected photovoltaic system was proposed. Based on the traditional double loop the power tracking link was joined in the control strategy, which improved the output current response speed when the input power changed. BP neural network self-tuning PI controller was used by the tracking control strategy to realize the current loop, improving the current waveform when the load sudden change and the system dynamic performance. MATLAB/simulink was used by the simulation model, the results show that the system can reliably and stably transmit electricity to the grid. The experimental result of 2 k W PV inverter prototype proves the correctness of the theoretical analysis.
出处
《电源技术》
CAS
CSCD
北大核心
2016年第2期400-403,共4页
Chinese Journal of Power Sources
基金
江苏大学高级专业人才专项资助项目(13JDG111)
关键词
光伏并网
逆变器
功率跟踪
BP神经网络
photovoltaic grid connected
inverter
power tracking
BP neural network
