摘要
在考虑电网阻抗情况下对带LCL滤波器的三相光伏逆变器稳定性以及相应的控制策略进行研究。详细分析电网阻抗对并网光伏系统稳定性的影响,同时提出基于状态反馈极点配置的逆变器控制策略以实现系统极点的任意配置,从而抑制电网阻抗对系统电能质量以及稳定性的影响。最后建立系统仿真和实验模型进行验证。结果表明:电网阻抗易导致采用PR+HC控制器的光伏并网系统出现不稳定,降低系统并网电能质量;所提出的极点配置方法可有效抑制电网阻抗对系统稳定性影响。
The stability of the three-phase PV inverter with LCL filter and corresponding control strategy were researched considering the grid impedance. First, the grid-connected PV inverter stability was analyzed of grid impedance. Then the inverter control strategy was proposed based on state feedback to achieve the system poles assignment thereby inhibiting the effect on the system power quality and stability considering the grid impedance. Finally the study was validated through simulation. Studies have shown that： the grid impedance can decrease the LCL filter resonance frequency and the PV system with PR＋HC controller becomes unstable, severely reducing the power quality; the proposed pole-assignment control strategy can effectively inhibit the grid impedance impact on system stability.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2015年第9期2146-2151,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51477021)
国家高技术研究发展(863)计划(2011AA05A301)
