Distributed PV And Low Voltage Network Anti-islanding Technology Research And Application

With large scale of distributed photovoltaic power, the possibility of islanding in increasing, directly affect the power maintenance staff on site safety operation.Low-voltage anti-islanding device can be applied to380v/220v distribution network, it composed of operating switches and load disturbance. Low-voltage anti-islanding device based on the photovoltaic technology islanding mechanism and anti-islanding protection strategy for development and design, with the anti-islanding function archived by breaking the operation requirement of the islanding scenario.This thesis researches the relationship of the electric parameters of distributed photovoltaic island, describes different types (resistance, inductive, capacitive) low-voltage anti-islanding device, the design principle of experimental verification and analysis of the design principle of fully. By comparing different types (resistance, inductive, capacitive) low-voltage anti-islanding device of the test results and the load characteristic of device, the results show that low pressure reverse island device disturbance load has obvious advantages in type selection of resistance. Combination with the engineering practice, to determine the three kinds of typical low-voltage anti-islanding device capacity and application form, and the standardization of typical low pressure reverse island device design.Low-voltage anti-islanding device is a security line for power maintenance staff to deal with large-scale distributed photovoltaic accessed, the electric power maintenance personnel of the site safety operation and the healthy and orderly development of distributed photovoltaic power generation is of great significance.