Voltage fluctuation evaluation method for accessing distributed power supply to transformer area

The embodiment of the invention provides a voltage fluctuation evaluation method for accessing distributed power supply to a transformer area. The voltage fluctuation evaluation method comprises the following steps: determining node parameters at the moment when the output of the distributed grid-connected power supply is minimum based on received power data; calculating the voltage of each node according to the node parameter at the moment when the output of the distributed grid-connected power supply is determined to be minimum, and normalizing the obtained voltage; drawing a closed graph for the numerical value in the obtained normalization result in combination with the qualified voltage threshold range of the low-voltage power system to obtain the area of the closed graph; and calculating an area ratio formed by voltage of each point under the condition that the output of the distributed power supply is maximum by combining the obtained area of the closed graph, and taking the obtained area ratio as a re