摘要
通过分析三相LCL型并网逆变器在两相静止坐标系下的数学模型,提出了一种静止坐标系下利用准比例谐振(proportional resonant,PR)控制器实现入网电流无静差跟踪的控制策略。为了有效抑制LCL滤波器由于阻尼不足而产生的谐振,引入电容电流反馈来实现有源阻尼。采用频域分析法,根据稳定性、稳定裕度以及稳态误差要求,分别设计电容电流反馈系数及准PR控制器的比例系数和谐振增益系数。仿真与实验结果验证了所采用参数设计方法的正确性和所提出控制策略的可行性。
Through analysis of the mathematical model of three-phase grid-connected inverter with LCL filter inthe two-phase stationary coordinates,a quasi-PR controller based grid current astatic tracking control strategy wasproposed. To restrain the resonance due to insufficient damping,the capacitor current feedback was introduced torealize active damping. According to the requests of stability,stability margin and steady-state error,the capacitorcurrent feedback coefficient,the resonant gain and proportional factor of quasi-PR controller could be designedrespectively by the using of frequency theory. The effectiveness of adopted parameters design method and feasibility ofproposed control strategy are verified by the simulation and experiment results.
出处
《电气传动》
北大核心
2016年第3期53-57,共5页
Electric Drive
基金
上海市绿色能源并网工程技术研究中心(13DZ2251900)
关键词
LCL滤波器
准PR控制器
有源阻尼
电容电流反馈
LCL filter
quasi-PR(proportional resonant controller)
active damping
capacitor current feedback
