CAJ | 학술논문

在光伏发电系统中,并网逆变器通常用来将高质量的电能馈入电网.但是由于死区控制、电网扰动等因素的影响,逆变器馈入电网的电流中含有大量谐波成分.由于带宽的限制,单纯的比例积分控制器不能有效地抑制谐波.因此本文提出了一种由比例积分控制器(PI)和重复控制器(RC)并联构成的复合控制器以提高系统的谐波电流抑制能力.本文建立了同步旋转坐标系下的逆变器动态模型并给出了控制器设计方法.理论分析以及一台20kW逆变器样机的实验结果证明了所提控制策略的可行性.
재광복발전계통중,병망역변기통상용래장고질량적전능궤입전망.단시유우사구공제、전망우동등인소적영향,역변기궤입전망적전류중함유대량해파성분.유우대관적한제,단순적비례적분공제기불능유효지억제해파.인차본문제출료일충유비례적분공제기(PI)화중복공제기(RC)병련구성적복합공제기이제고계통적해파전류억제능력.본문건립료동보선전좌표계하적역변기동태모형병급출료공제기설계방법.이론분석이급일태20kW역변기양궤적실험결과증명료소제공제책략적가행성.
Three-phase grid-connected voltage source inverter(VSI)is often used to feed high quality current into grid in photovoltaic(PV)power generation system.But many factors,such as switching dead-time effects and disturbance of grids ete,will deteriorate the current waveform,and a large number of harmonic will be fed into grid too.Owing to the conflict between stability and fast response,proportional-integral(PI)controller has limited capabilities to restrain harmonic disturbances and can not guarantee the output performance of grid-connected inverter,so a new control algorithm using compound controller constituted by repetitive controller(RC)and PI controller is proposed in this Paper to overcome the shortcomings of PI controller in harmonic control.A dynamic model of grid-connected lnverter in synchronous rotating frame(SRF)is derived and the compound current controller design is presented too.Theoretic analysis and experimental results on a 20kW prototype verify that the proposed current controller offers a high performance of current control.