This paper focuses on the design of the inverter power stage connected with PV-grid which supports the contrived PV system. The increased number of grid connected photovoltaic (PV) inverters gave rise to problems conc...This paper focuses on the design of the inverter power stage connected with PV-grid which supports the contrived PV system. The increased number of grid connected photovoltaic (PV) inverters gave rise to problems concerning the stability and safety of the utility grid, as well as power quality issues. The proposed systems can overcome these issues and improve standard regulation methods for gird connected PV inverter. The maximum available voltage in the PV string is tracked by the power stage which has been planned and designed in such a way. The tracked voltage is boosted then. The important components to voltage source inverter (VSI) are boost inductor and input capacitor which are calculated. To get a clear sinusoidal output phase voltage of 230 V from a DC capacitance bus projected to deal with 400 V, the important inverter stage parameters have been planned and modeled in Mat lab. Each block stage of the converter is easily understandable by the Simlink of the dual stage DC-AC converter explanation. The control schemes which have been proposed would compromise with the inverter power stage which forms the neat grid system. The existing renewable energy sources in the laboratory are integrated by the proposed control.展开更多
针对新能源设备功率变化会引起直流母线电压波动,且在电网频率波动较大的弱电网环境下,有功功率可能会产生功率振荡,从而使构网型光储系统暂态性能变差的问题,采用虚拟同步发电机技术,提出一种基于降阶高增益观测器(reduced-order high ...针对新能源设备功率变化会引起直流母线电压波动,且在电网频率波动较大的弱电网环境下,有功功率可能会产生功率振荡,从而使构网型光储系统暂态性能变差的问题,采用虚拟同步发电机技术,提出一种基于降阶高增益观测器(reduced-order high gain observer,RHGO)的新型终端互补滑模控制(novel terminal complementary sliding mode control,NTCSMC)策略。首先,在观测器中引入高增益系数来抑制瞬态振荡,并通过降阶设计对观测器结构进行简化;其次,在终端互补滑模面上引入控制系数,增强了被控系统的稳定性,并设计超螺旋切换律来抑制抖振;然后,从理论上证明RHGO和NTCSMC的稳定性;最后在MATLAB仿真和实验平台上,分别对比例积分(proportional integral,PI)控制、基于传统扩张状态观测器-滑模控制(extended state observer-sliding mode control,ESO-SMC)与改进ESO-SMC控制方法进行仿真及实验验证。结果表明,所提控制方法在构网型光伏并网储能系统的暂态性能方面具有良好的效果。展开更多
文摘This paper focuses on the design of the inverter power stage connected with PV-grid which supports the contrived PV system. The increased number of grid connected photovoltaic (PV) inverters gave rise to problems concerning the stability and safety of the utility grid, as well as power quality issues. The proposed systems can overcome these issues and improve standard regulation methods for gird connected PV inverter. The maximum available voltage in the PV string is tracked by the power stage which has been planned and designed in such a way. The tracked voltage is boosted then. The important components to voltage source inverter (VSI) are boost inductor and input capacitor which are calculated. To get a clear sinusoidal output phase voltage of 230 V from a DC capacitance bus projected to deal with 400 V, the important inverter stage parameters have been planned and modeled in Mat lab. Each block stage of the converter is easily understandable by the Simlink of the dual stage DC-AC converter explanation. The control schemes which have been proposed would compromise with the inverter power stage which forms the neat grid system. The existing renewable energy sources in the laboratory are integrated by the proposed control.
文摘针对新能源设备功率变化会引起直流母线电压波动,且在电网频率波动较大的弱电网环境下,有功功率可能会产生功率振荡,从而使构网型光储系统暂态性能变差的问题,采用虚拟同步发电机技术,提出一种基于降阶高增益观测器(reduced-order high gain observer,RHGO)的新型终端互补滑模控制(novel terminal complementary sliding mode control,NTCSMC)策略。首先,在观测器中引入高增益系数来抑制瞬态振荡,并通过降阶设计对观测器结构进行简化;其次,在终端互补滑模面上引入控制系数,增强了被控系统的稳定性,并设计超螺旋切换律来抑制抖振;然后,从理论上证明RHGO和NTCSMC的稳定性;最后在MATLAB仿真和实验平台上,分别对比例积分(proportional integral,PI)控制、基于传统扩张状态观测器-滑模控制(extended state observer-sliding mode control,ESO-SMC)与改进ESO-SMC控制方法进行仿真及实验验证。结果表明,所提控制方法在构网型光伏并网储能系统的暂态性能方面具有良好的效果。
