中文摘要：

微电网已成为智能电网建设中的重要组成部分,是可再生能源等分布式电源接入电网的有效方式。微电网电能质量客观科学的综合评价对于微电网的运营建设具有重要的现实意义和指导价值。基于微电网中电能质量的特点进行分析,提出了一种新的适合于微电网电能质量的评价方法。首先,从电压指标、电流指标和频率指标,结合对比大电网,对微电网电能质量各单项指标进行了详细阐述,指出其特点,并根据相关标准,确定电能质量各单项指标阈值。进一步,借鉴模糊评价思想,根据电能质量指标特点,采用柯西分布,提出了一种最优隶属度方法,并结合G1层次分析法确定指标主观权重,结合客观权重得到各指标的综合权重后进行综合评价,得到量化的微电网电能质量综合评价结果。最后,采用一组数据进行测试,并和其他方法进行对比分析,验证了所提出的方法的有效性。

英文摘要：

Micro-grid has already been an essential part of smart grid. It is an effective way to connect distributed generation such as renewable energy to power grid. It is most important to evaluate the power quality objectively and professionally for the micro-grid. Based on analyzing the characteristics of micro-grid power quality, this paper proposes a new power quality evaluation method suitable for micro-grid. First of all, from the perspective of voltage, current and frequency, compared with traditional power grid, every index of micro-grid power quality is analyzed in detail and the characteristics of indexes are pointed out. According to some relative standards, all power quality indexes＇ thresholds are ensured. Further, based on fuzzy evaluation method, Cauchy distribution membership function is adopted to determine all indexes＇ membership belong to the optimization. Indexes＇ subjective weights are defined by G1 method. Combined with the subjective and objective weights, the synthetic weights are got and used for comprehensive evaluation. And a quantitative micro-grid power quality evaluation result is obtained. Finally, simulation is applied by a given set of data from micro-grid. Simulation results prove that the proposed method is accurate and effective.