摘要
针对传统LCL并网逆变器对交流电流信号跟踪存在静差及抗干扰性较差的问题,提出一种基于准比例谐振和网压前馈的新型并网控制策略。该控制策略由逆变器侧电感电流反馈环、网侧电感电流外环和电网电压前馈环组成。其中网侧电感电流外环采用准比例谐振控制器,同时结合逆变器侧电感电流内环,在抑制LCL滤波器谐振峰的同时,提高了控制系统的精度;电网电压前馈控制的引入,一方面提高了系统的响应速度,另一方面保证了在电网发生畸变时并网逆变器较好的动态性能。最后,仿真结果验证了所提控制策略在无静差跟踪及抗电网电压扰动方面具有显著优势。
Aiming at solving a problem, which there are static error and a weak anti-interference performance when traditional LCL grid-connected inverter track AC current signal, a novel LCL grid-connected inverter control strategy was proposed. The control strategy was composed of an inner loop of the inductor feedback current of inverter side, feed-forward of grid voltage and an outer loop of the grid-current which employs Quasi-proportional resonant controller to improve the accuracy of control system. Meanwhile, the inductor feedback current of inverter side was applied to damp the resonance peak of LCL filter. In addition, the control strategy introduced grid voltage feed- forward so that it improved system response speed and dynamic performance when grid voltage distortion causes. Finally, the simulation and experiment results showed the proposed control strategy had a significant advantage in the zero static error tracking and anti-disturbance of grid voltage.
出处
《电机与控制应用》
北大核心
2016年第1期17-21,共5页
Electric machines & control application
基金
中央高校基本科研业务费专项资金资助(3132014300)
关键词
LCL并网逆变器
准比例谐振控制器
电网电压前馈控制
静差
LCL grid-connected inverter
quasi-resonant proportional controller
grid voltage feed-forward
static error
