Dynamic power coordination control method for battery energy storage system

Abstract

The invention discloses a dynamic power coordination control method for a battery energy storage system. The battery energy storage system comprises a plurality of power converters which supply power to a load and are connected in parallel for operation, and is characterized in that: the power converters connected in parallel for operation are divided into two types, and a master-slave control scheme is adopted, wherein one type comprises only one power converter which adopts a constant voltage constant frequency control mode and is called a master node, and the power converters of the other type adopt a constant power mode with a slight droop characteristic, and serve as slave nodes; generally, a power converter with a high capacity is selected to be the only one master node which is specified by an upper-layer monitoring system, and all the other power converters are the slave nodes; and under a stable state condition, active power and reactive power output by the power converters which serve as the slave nodes are set by a power instruction transmitted by the monitoring system, and the output power of the power converter which serves as the master node is dynamically regulated according to a load condition. The method adopting the master-slave control scheme has the advantages that: on the premise of sufficient power capacity, both the voltage stability and frequency stability of a micro-grid system are easily achieved, anti-load disturbance capability is high, and failure recovery time is short.

Description

technical field [0001] The invention relates to a dynamic power coordination control method of a battery energy storage system, in particular to a dynamic power coordination control method of a battery energy storage system containing multiple power converters (PCS), belonging to the dynamic power coordination control method of a battery energy storage system Modification technology of control method. Background technique [0002] A major feature of the battery energy storage system (BESS) is that it can continue to provide emergency power supply for specific important loads when an abnormality occurs in the large power grid, forming an isolated microgrid, referred to as a microgrid. The state in which the battery energy storage system operates independently with a specific load is the island operation state. Since the battery energy storage system has two operating modes of grid-connected and islanded, the battery energy storage system usually operates in three working sta...

AI Technical Summary

Problems solved by technology

The present invention proposes a simple and practical solution to the problem that the usual master-slave control method relies too much on the main power source to reduce system reliability. On the premise that the power capacity is sufficient, the present invention can stabilize the voltage of the microgrid system and Frequency stability is easy to achieve, strong anti-load disturbance ability, short fault recovery time

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