Synchronous implementation method and synchronous control device for three-phase uninterrupted power supply (UPS) parallel operation system

Abstract

The invention discloses a synchronous implementation method and a synchronous control device for a three-phase uninterrupted power supply (UPS) parallel operation system. The synchronous control device comprises a preprocessing circuit, a master control circuit and a parallel operation communication interface circuit; in the synchronous implementation method, the master control circuit samples and detects the voltage and current signals obtained by the preprocessing circuit, the phase, frequency and amplitude of the output voltage of the UPS inverter are regulated, and bypass / inversion logic control is realized; the parallel operation communication interface circuit is used for transmitting / receiving a synchronizing signal, a bypass / inversion control signal, an inverter state signal and a bypass phase-A voltage tracking signal. According to various different operation states of the UPS, the synchronizing signal is analyzed and integrated through a digital signal processor (DSP), a pulse width modulation (PWM) control signal is transmitted, and the frequency and the phase of each UPS output voltage in the parallel operation system are controlled, so that the high-precision synchronization of the frequency and the phase of each UPS output voltage is realized.

Description

technical field [0001] The invention relates to a method for synchronizing three-phase UPS (uninterruptible power supply) in parallel, specifically through the control of 32-bit DSP TMS320F2812, to realize the high-precision synchronization of the frequency and phase of the output voltages of each UPS in the parallel system. Background technique [0002] With the continuous improvement of important electrical equipment and users' requirements for high-quality power supply, UPS has been widely used. The development of full-control power electronic devices, high-performance DSP and advanced control technology has promoted the development of UPS in the direction of green, digital, intelligent and redundant parallel operation. Parallel operation can make UPS power supply system easy to expand and realize redundant In addition, the reliability of the system is greatly improved. The key technology of the parallel machine is the high-precision synchronization of the frequency and ...

AI Technical Summary

Problems solved by technology

This method has high reliability and is easy to expand. It is a relatively complete parallel machine technology, but the algorithm of this method is relatively complicated and the detection accuracy is very high.

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