Control method and system for microgrid multiple island detection

Abstract

A control method and system for detecting multiple islands in a microgrid relate to the technical field of microgrid operation control. The control method includes the following steps: In the microgrid system, each energy storage PCS and photovoltaic inverter is equipped with an active island detection module, and one PCS or photovoltaic inverter is only configured with one detection method; the energy storage PCS And the photovoltaic inverter uploads the active island detection method and marking signal used by itself to the microgrid controller through fast communication; the microgrid controller summarizes all the active island detection signals received and combines the sampling signals of the microgrid system to perform Real-time island detection; the detection results of the micro-grid controller and the detection results of the energy storage PCS and photovoltaic inverter are respectively sent to the smart grid-connected cabinet; operate. The invention can effectively utilize the information summarized by the micro-grid controller to realize fast and accurate island detection; the control function of the intelligent grid-connected cabinet is simplified.

Description

technical field [0001] The invention relates to the technical field of micro-grid operation control. Background technique [0002] The microgrid can realize the effective management of distributed power generation, and fully tap the value and benefits brought by distributed power generation to the power grid and users. A key technology of the microgrid is the operation control of the microgrid, that is, it can coordinate the power generation and load of the microgrid, independently select the operating point, and can operate stably in the grid-connected and island modes, and switch between the two modes smoothly. . Therefore, fast and reliable island detection is very important for the normal operation of the microgrid. [0003] When the island occurs, if the island effect cannot be detected in time, there will be major hidden dangers to the safety of equipment and personnel, which is reflected in the following two aspects: On the one hand, when the maintenance personnel s...

AI Technical Summary

Problems solved by technology

The shortcomings of the current island detection are explained from two perspectives. First, the island detection of the current microgrid is mainly completed by energy storage PCS (energy storage converter) or photovoltaic grid-connected inverter, which is limited by PCS and photovoltaic inverters. Generally, each photovoltaic inverter or PCS will only choose an active islanding detection method, and use it in conjunction with passive islanding detection

Second, although scholars at home and abroad have proposed many active island detection methods, each island detection method has its own shortcomings.

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