A voltage stabilization system and method for parallel operation of asynchronous generator sets

Abstract

The invention discloses a voltage stabilizing system for asynchronous generator set parallel operation. The voltage stabilizing system comprises a signal sampling module, a controller and a magnetic energy regeneration switch, wherein the signal sampling module collects line voltage and phase current signals of a micro-grid and transmits the signals to the controller. When the line voltage of the micro-grid drops, the controller controls the magnetic energy regeneration switch to output higher capacitive reactive power so as to balance inductive reactive power of the system. When the line voltage of the micro-grid rises, the controller controls the magnetic energy regeneration switch to output lower capacitive reactive power so as to reduce surplus capacitive reactive power in the system. One end of the magnetic energy regeneration switch is connected with the micro-grid, the other end of the magnetic energy regeneration switch is connected with the controller to receive an instruction sent by the controller, and output capacitive reactive power is increased or decreased according to the instruction. By means of the voltage stabilizing system and method, network voltage can be tracked quickly, and voltage drop can be prevented effectively.

Description

technical field [0001] The invention relates to the technical field of power grid voltage control and reactive power compensation, in particular to a voltage stabilizing system and method for parallel operation of asynchronous generating sets. Background technique [0002] With the increasing shortage of traditional mineral energy such as coal and oil, the development and utilization of new energy has become the main direction of energy strategy development in countries around the world. Make full use of the characteristics of the local environment to build small-scale power supply networks (ie, micro-grids) for buildings, islands or communities based on multiple energy sources, small capacity, and flexible installation. It is an important way to develop and utilize new energy sources to alleviate energy shortages. Applying asynchronous generators to microgrids can greatly reduce costs, and has the advantages of easy maintenance and high reliability. Therefore, it is of gre...

AI Technical Summary

Problems solved by technology

[0003] The output voltage of the asynchronous generator decreases with the increase of the load, and its load characteristics greatly limit its application

The voltage drop can be effectively prevented by increasing the parallel excitation capacitor, but the load size changes randomly and is unpredictable. The voltage stabilization by connecting multiple sets of excitation capacitors in parallel cannot change with the change of the load size, and cannot achieve good results.

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