Control method for suppressing power grid frequency fluctuation under island medium-voltage micro-grid

Abstract

The invention discloses a situation awareness and guiding method for suppressing power grid frequency fluctuation under an island medium-voltage micro-grid. Situation awareness and a guiding method are combined and applied to the island medium-voltage micro-grid for the first time to ensure that the island medium-voltage micro-grid can continuously stabilize the frequency when the output power of a distributed power supply fluctuates. The method comprises the steps of conducting island medium-voltage micro-grid modeling; performing situation awareness based on historical data; and implementing a situation guiding method for suppressing frequency fluctuation. According to the method provided by the invention, when the island medium-voltage micro-grid runs, an information acquisition unit firstly extracts the wind speed of a fan and the frequency information of the power grid as historical data, then situation awareness is performed, advanced prediction is conducted on the frequency situation of the power grid system, then the predicted values of the active power and the reactive power are obtained according to the coupling relationship of the island medium-voltage micro-grid, and a situation decision system and a situation execution system are controlled to realize a situation guidance function, so that frequency fluctuation can be effectively suppressed, impact on a power grid system is reduced, and the system frequency can be continuously kept stable when the output power of the distributed power supply fluctuates.

Description

technical field [0001] The invention relates to the technical field of monitoring, analysis and control of a microgrid system, in particular to a control method for suppressing frequency fluctuations of a power grid under an isolated island medium-voltage microgrid. Background technique [0002] On some large islands, the demand for electricity is large. Due to the long distance, it is impossible to connect with the large power grid, and the power generation facilities and electrical equipment on the island are far away. In order to reduce power loss and improve power transmission efficiency, a medium-voltage Island microgrid. On the island, solar energy and wind energy are abundant, and the proportion of photovoltaic power generation and wind power generation continues to increase, which can reduce the use of diesel engines and energy storage equipment to reduce costs. However, with the continuous improvement of photovoltaic power generation and wind power generation, the ...

AI Technical Summary

Problems solved by technology

In the medium voltage microgrid, only active power or reactive power can be adjusted, and a good frequency modulation effect cannot be achieved.

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