Flywheel energy-storing array coordinative control method and device for micro-grid isolated island state

Abstract

The invention discloses a flywheel energy-storing array coordinative control method and device for a micro-grid isolated island state. The method comprises: a flywheel energy-storing array topology formed by connecting a plurality of flywheels in parallel; a control strategy of single flywheel in an array; a coordinative control strategy of each flywheel in an energy-storing unit which is formed by connecting the plurality of flywheels in parallel in the same direct-current bus; a coordinative control strategy of each energy-storing unit in an energy-storing array which is formed by connectinga plurality of energy-storing units into a micro-grid alternating-current bus in parallel. According to the method, coordinative control of the flywheel energy-storing array can be realized, high-efficiency and stable operation of the flywheel energy-storing array is guaranteed, reasonable power distribution is realized, and voltage amplitude and frequency are guaranteed to be within the reasonable range.

Description

technical field [0001] The invention relates to the technical field of energy storage in an AC microgrid, in particular to a method and device for coordinated control of a flywheel energy storage array used in an island state of a microgrid. Background technique [0002] Different from the traditional large power grid, the micro-grid has small inertia and small damping, resulting in weak anti-interference ability; in addition, a large amount of intermittent renewable energy is connected to the micro-grid, such as wind power, photovoltaic power generation, etc., during operation The problem of external disturbance needs to be solved, and it is more difficult to maintain the stable operation of the microgrid. Especially in the micro-grid island mode, without the support of the large power grid, it is difficult to maintain the amplitude and frequency of the AC voltage, which may lead to problems such as loads and wind turbines not operating normally. The energy storage system ...

AI Technical Summary

Problems solved by technology

(4) The droop coordination control of multiple flywheels connected in parallel to the AC bus is studied, but the power distribution of multiple energy storage units is rarely involved

However, multiple flywheels are first connected in parallel to the DC bus through their respective converters to form a flywheel energy storage unit, and multiple flywheel energy storage units are connected in parallel to the AC bus through their respective converters to form a complex flywheel energy storage array. Coordinated control is more complex. complex

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