摘要
基于带LCL滤波器的三相并网逆变器系统,提出将分裂电容电流控制与无源阻尼相结合的控制策略。通过分析分裂电容电流反馈控制的原理及谐振特性可知,采用分裂电容电流反馈可使被控系统由三阶系统转换为一阶系统,有利于增大系统的带宽,但为了抑制控制环外的电容和电感产生的谐振,需在第二个电容支路加入阻尼电阻以满足对并网电流的要求。最后对该控制方案的可行性和影响因素进行分析,建立Matlab/Simulink仿真模型,通过仿真验证该方案的可行性和有效性。
Based on grid-connected inverter with LCL-fiher, a control method combined the splitting capacitor current feedback control and passive damping was proposed. The control principle and resonance characteristics of splitting capacitor current feedback control were analyzed. The results show that the system can be simplified from third-order to first-order by feedback current flowing between these two splitting capacitors. And this can improve the control bandwidth of the system. However, in order to suppress the resonance peak produced by the capacitor and inductance outside the control loop, a damping resistor is put into the branch of the second capacitor. Thus, the grid side current can meet the requirements. At last, the feasibility and influence factors of the scheme are analyzed, and a Matlab/Simulink model is established to verify the feasibility and effectiveness of the scheme.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2016年第4期815-822,共8页
Acta Energiae Solaris Sinica
基金
河北省自然科学基金(E2016203092)
关键词
LCL滤波器
并网逆变器
分裂电容电流反馈
PI控制
无源阻尼
LCL-filter
grid-connected inverter
splitting capacitor current feedback
PI controller
passive damping
