A Comprehensive Evaluation Method for Power Quality of Distributed Photovoltaic Integration into Distribution Networks Based on Credibility Theory

With the rapid development of renewable energy, a large amount of photovoltaic power generation is integrated into the distribution grid. In order to accurately assess the impact of distributed photovoltaic power generation on the distribution grid, this paper proposes a comprehensive evaluation method of power quality based on the credibility theory. By defining the membership degree function of each index in the indicator system as a fuzzy set, and simultaneously using credibility measure to calculate the comprehensive evaluation matrix, the assessment results of the distribution grid operation status for a certain period are obtained based on the maximum credibility measure principle. Simulation results demonstrate that the proposed method effectively evaluates the operational status of the distribution grid in the studied area.