【摘要】 光伏并网功率调节(PVPC)系统是将光伏并网发电和有源电力滤波合为一体的综合系统,它易受电网扰动和外部环境变化的影响,存在诸多不确定性因素。将自抗扰技术应用到PVPC系统的控制中,把系统模型中的不确定因素与外部扰动统一视为系统的未知干扰。通过扩张状态观测器对扰动进行动态观测,然后利用非线性状态误差反馈控制律进行补偿,使系统的控制律与系统内部的参数和未知扰动无关,而仅与系统的给定输入和输出有关,免去了对负载电流谐波和无功的检测,使系统控制过程得以简化。仿真结果表明,所设计的自抗扰控制器能取得预期的控制效果,具有良好的动态性能和较强的鲁棒性。更多还原

【Abstract】 Photovoltaic grid-connected power conditioning system(PVPC) is an integrated system for photovoltaic grid-connected generation and active power filter.It’s vulnerable to grid disturbances and the impact of changes in the external environment,so there are many uncertainties.The active disturbances rejection control technique is introduced into the control of PVPC system.The system model uncertainties and external interferences are regarded as the unknown disturbance to the system.The disturbance is observed dynamically by extended state observer,then can be compensated through the nonlinear state error feedback control law.The control law is only relative to the reference input and the output,not to the system internal parameters and the unknown disturbance.Thus,the system control is simplified without the detection of load harmonics and reactive power currents.The simulation results show that the designed active disturbances rejection controller can achieve desirable efficiency and be of good dynamic performance and robustness.更多还原