摘要
在分布式发电(DG)并网系统中,孤岛检测是必不可少的环节。为了实施快速、便利以及经济的孤岛检测方案,同时最大限度减小孤岛检测对电能质量的影响,提出了一种基于滤波装置短路的孤岛检测方法。首先简单介绍了LCL滤波装置中的参数设计,之后阐述了该孤岛检测方案的原理,即利用短路滤波装置的方法,通过检测分布式电源向系统内注入电压谐波的变化情况,从而求取公共耦合点处(PCC)电压谐波畸变率以判断孤岛状态是否发生。其优点是易于实现,可以方便快速地实施孤岛检测,并且该方法仅通过对逆变器进行简单地改造就可以实现,使得孤岛检测成本降低。仿真和实验结果验证了所提出的基于滤波装置短路的孤岛检测方法的有效性与可行性。
Islanding detection is an essential part of the grid-connected DG system. To implement a fast, convenient and economical islanding detection scheme, and meanwhile to minimize the impact of islanding detection on power quality, a new islanding detection method based on the short-filtering devices is proposed. To begin with, this paper makes a brief introduction to LCL filter device＇s parameter design. And then, the principle of this islanding detection scheme is described, which specifically involves the use of short-filtering device and the detection of the change of voltage harmonic injected into the system by DG to calculate the voltage total harmonic distortion rate at the point of common coupling （PCC） and thus whether an islanding state occurs is determined. The advantages of this method include easy achievements and the feasibility of the convenient and rapid islanding detection. And moreover it can be achieved by the simple transformation of inverter and brings simultaneous cost reduction. Simulation and experimental results verify that the method is effective and feasible.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2015年第19期106-111,共6页
Power System Protection and Control
基金
国家电网宁夏电力公司科技项目(SGNX0000DK JS1300713)
