基于滤波装置短路的孤岛检测法在分布式发电系统中的应用

发布时间：2018-12-06 12:58

【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。
[Abstract]:In distributed generation (DG) grid-connected system, islanding detection is an essential link. In order to implement a fast, convenient and economical islanding detection scheme and minimize the influence of islanding detection on power quality, a method of islanding detection based on short circuit of filter device is proposed. First, the parameter design of LCL filter device is introduced briefly. Then the principle of the isolated island detection scheme is introduced, that is, by using the method of short circuit filter, the variation of voltage harmonics injected into the system by distributed power supply is detected. The harmonic distortion rate of (PCC) voltage at the common coupling point is obtained to determine whether the isolated island state occurs or not. The advantages of this method are that it is easy to realize, and can be easily and quickly implemented, and the method can be realized only by simply modifying the inverter, which can reduce the cost of islanding detection. Simulation and experimental results show the effectiveness and feasibility of the proposed detection method based on short circuit of filter device.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);国网宁夏电力公司;
【基金】：国家电网宁夏电力公司科技项目(SGNX0000DK JS1300713)
【分类号】：TM61

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