Energy storage converter communication-line-free parallel strategy based on bus voltage event detection

Abstract

The invention discloses an energy storage converter communication line-free parallel strategy based on bus voltage event detection. The strategy comprises the steps: based on the background that the load end of the energy storage converter is close, acquiring a voltage signal of a PCC point common terminal as a common event signal; realizing the power sharing of each energy storage converter basedon a PCC voltage feedback method; based on the principle of an event detection mechanism, taking an event signal of PCC voltage as a synchronizing signal for realizing the voltage frequency recoveryof each energy storage converter, so the requirement of each energy storage converter on a communication interconnection line is avoided. The strategy control method is simple, practical, convenient to improve, good in system expansibility and low in construction cost of the interconnection-line-free multi-machine parallel system, and has a more practical engineering application value.

Description

technical field [0001] The invention belongs to the technical field of energy storage converter control, and in particular relates to an energy storage converter parallel connection strategy without communication lines based on bus voltage event detection. Background technique [0002] The disadvantages of traditional fossil energy have led to the rapid development of new energy related research. New energy and other distributed power sources have small power generation capacity and usually require parallel power supply. Energy storage converters are used as the carrier of distributed power sources, and their parallel control technology has become a research topic. hotspot. Droop control is often used for multi-unit parallel connection of energy storage converters. Due to the droop characteristics, problems such as power distribution and voltage frequency recovery are usually faced. Under the inductive line impedance, the distribution of active power will be automatically di...

AI Technical Summary

Problems solved by technology

This method requires mutual communication between energy storage converters to achieve synchronous compensation. When the compensation is not synchronized, the output error of energy storage converters will accumulate, which will eventually lead to the instability and collapse of the parallel system of energy storage converters. Therefore, A communication line is required between the converters for synchronization

However, the use of communication lines will increase the complexity of the system, especially as the number of parallel units increases, it will reduce the stability of the system

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