Modular energy storage converter parallel operation and hot plug control method

Abstract

The invention discloses a modular energy storage converter parallel operation and hot plug control method. When the modular energy storage converter is disconnected from the power grid and is in an off-grid black-start state, the upper-layer controller issues a power module grid-connected relay closing command at the same time, a main module virtual synchronous machine is generated through an automatic main selection strategy. The rest are slave virtual synchronous machines. A main module virtual synchronous machine is controlled to be softly started to establish load voltage, and then, the slave module virtual synchronous machine is subjected to pulse unlocking and operates in parallel with the master virtual synchronous machine, so that each module of the modular energy storage converteris quickly accessed to a power grid and a load, the problems of single working mode, slower multi-module starting during off-grid operation and electrical impact caused by incorporation of multiple modules into the system in the traditional technical scheme are solved, and good electric energy quality is kept.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a method for paralleling and hot swapping control of modularized energy storage converters. Background technique [0002] As the interface between the energy storage components and the AC grid in the energy storage system, the bidirectional energy storage DCAC converter plays an important role in the entire energy storage system. In high-power and high-reliability applications, energy storage converters mostly use redundant parallel connection of multiple modules of converters and hot-swappable technology. The key problem to be solved in parallel and hot-swap control is to adopt reasonable and effective control measures to avoid strong inrush current during the input and exit process of the converter module according to the parallel connection mode and current sharing strategy adopted by the converter. And the electrical transient process, realize the smooth i...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for paralleling and hot-swapping control of modular energy storage converters, which can effectively solve the problem of single working mode. In the case of multiple virtual synchronous modules, multiple modules can be started when running off-grid. Slow and incorporated into the system causing electrical shock issues

Images