Distributed photovoltaic generation system is an effective way to integrate renewable energy resources like photovoltaic (PV).With the increasing penetration of PV, the power quality of the utility is challenged.Aim to the power quality enhancement of grid-tied PV systems, the power fluctuation at DC bus and harmonic at AC bus are addressed.An improved PV interface combined energy storage (ES) is proposed to handle these issues.The hybrid ES including batteries and super-capacitors are utilized to suppress the power fluctuation of PV.A self-adaptive-filter-based algorithm is used to detect the harmonic current of local load, thus to enhance the power quality of the PV-ES system.In order to manage the PV-ES system, a hierarchical control is employed.A power dispatching control is used to set the power references of PV, batteries, and super-capacitors.Local controller of converters is presented to track the power reference.In such a way, the PV-ES system can be much more grid-friendly and schedulable.Simulated results by using PSCAD/EMTDC are achieved to confirm the validity and effectiveness of the proposed models and control schemes.%分布式光伏发电系统是可再生能源的有效组织方式,随着分布式光伏渗透率的不断提高,给电网供电品质带来了挑战.针对分布式光伏直流侧输出功率波动、交流侧谐波电能质量的问题,提出光储联合发电系统加以应对.通过在直流侧加设一体化的混合储能系统,平抑光伏输出的波动性;利用基于自适应滤波算法的负荷谐波检测算法,以及分布式光伏电能质量主动治理控制方法,有效降低交流侧的谐波水平.提出了基于分层控制的光储联合发电系统控制方案,功率调度层管理光伏、电池和超级电容的功率潮流,变流器本地控制层控制各变流器精确跟踪指令功率,可以提升光储联合发电系统的可调度性和电网友好性.利用PSCAD/EMTDC的仿真结果验证了所提控制算法的可行性和有效性.
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