摘要
针对相同滤波效果下采用L型滤波器的单相光伏并网逆变器的PI控制需要较大的电感值以及存在高损耗、电流内环响应速度降低和成本较高的不足,提出了采用基于LCL滤波的电容电流反馈和电网电压前馈的准PR控制策略,以增加系统阻尼、抑制振荡、提高系统稳定性能,并通过Matalab/Simulink软件搭建仿真模型进行了验证。结果表明,经LCL滤波后,在准PR控制策略下,加入电容电流反馈和电网电压前馈后,获得的入网电流畸变率更小,实现了入网电流的无静差跟踪,抑制了电网电压的扰动,且系统输出的波形满足入网要求。
In the same filtering effect, the single-phase photovoltaic grid-connected inverter with L-type filter needs large inductance values and exists high loss, lower current response speed and high cost under the control of the PI. This paper proposes a standard PR control strategy by using LCL type filter with the feedback of capacitance current and net work voltage, which increases system damping, restrain oscillation and improve the stability of system. The simulation model is established under Matalab/Simulink. The results show that the grid current distortion rate is smaller, the grid current is no static error, the voltage disturbance is suppressed, and the system output meets the requirements of grid.
出处
《水电能源科学》
北大核心
2014年第5期168-171,179,共5页
Water Resources and Power
基金
天津市自然科学基金项目(09JCZDJC23900
10JCZDJC23100)
关键词
光伏并网逆变器
LCL滤波器
PR控制器
电容电流反馈
电网电压前馈
photovoltaic grid-connected inverter
LCL filter
PR controller
feedback of capacitance eurrent
feedforward of network voltage