User side micro grid system capable of performing island detection

Abstract

The invention provides a user side micro grid system capable of performing island detection, comprising a micro grid bus, a primary system and a secondary system. The micro grid bus is connected with a 380V grid through a contactor and a circuit breaker. The primary system comprises a photovoltaic power generation system, an energy storage system, and load devices. The photovoltaic power generation system and the energy storage system are respectively connected with the micro grid bus through a contactor and a circuit breaker. Each load device is connected with the photovoltaic power generation system, the energy storage system or the grid through a contactor and a circuit breaker. The secondary system is a master control hardware programmable micro grid island detection system comprising a central processor module which receives island alarm signals sent by the photovoltaic power generation system and the energy storage system and triggers an instruction according to the received signals, a communication module which transmits the island alarm signals sent by the photovoltaic power generation system and the energy storage system to the central processor module and issues a communication control instruction, a digital input module, a digital output module, an analog input module, and an analog output module.

Description

technical field [0001] The invention belongs to the technical field of micro-grid island detection, and in particular relates to a user-side micro-grid system capable of island detection. Background technique [0002] Microgrid has two states of grid-connected operation and island operation. The occurrence of isolated islands will not only cause damage to power system equipment, but also threaten the life safety of power system maintenance personnel and other serious problems. Therefore, the photovoltaic grid-connected power generation system must have an island detection function to ensure the safe operation of the grid. [0003] So far, a variety of islanding detection methods based on distributed power sources have been developed. It is most direct to use the data acquisition and monitoring control system or carrier communication on the power grid side to detect the working status of each relay in the distribution network. This method has no detection blind area, but th...

AI Technical Summary

Problems solved by technology

It is most direct to use the data acquisition and monitoring control system or carrier communication on the power grid side to detect the working status of each relay in the distribution network. This method has no detection blind area, but the economic cost is too high and the practicability is poor.

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