On-line high-frequency UPS inverting control method

Abstract

The invention discloses an on-line high-frequency UPS (Uninterrupted Power Supply) inverting control method. The control method comprises the following steps: A, an error signal is obtained in the way that a reference voltage and a output voltage, which are subjected to processing and generated by the inside of a DSP(Digital Signal Processor) chip minus a direct current component controlling quantity ; B, a corrected error signal is obtained in that way that after being input by a repetitive controller, one error signal is superimposed with another error signal; C, the corrected error signal is used as a current loop reference value after subjected to proportional resonance control and amplitude limiting sequentially; D, a current loop output signal is obtained in the way that after the error of the calculation of the current loop reference value and circuit sampling inductance current is taken out, the proportional calculation is performed; E, a control signal is obtained by the current loop output signal superimposing with a duty cycle feedforward quantity, so as to control an ePWM (Pulse-Width Modulation) wave emission module to emit PWM to drive a waveform. The method adopts a complex control scheme, is high in voltage stabilization precision, strong in control capability and good in sine; the smooth transition can be realized in the process of start-up and stopping of equipment to avoid impact; the method can be widely used in the field of inverting control.

Description

technical field [0001] The invention relates to the field of inverter control, in particular to an inverter control method of an online high-frequency UPS. Background technique [0002] With the development of social economy, all sectors of society have put forward higher and higher requirements for the reliability and quality of power supply system. UPS (Uninterruptible Power System) uninterruptible power supply, as a kind of power equipment to improve the reliability and quality of power supply, is more and more widely used in factories, banks, computer rooms and data centers, etc., which require high power supply. The inverter part of UPS is the key part to determine the output waveform and output stability of UPS. With the development of digital control technology and digital chips, more and more traditional analog control is realized by digital control. UPS inverter control is also more and more realized by DSP digital control. [0003] The traditional inverter contr...

AI Technical Summary

Problems solved by technology

PI control has some inherent problems, such as the tracking of the AC reference can not achieve no static error, PI parameters are difficult to adjust in practical applications, in addition, the inverter voltage waveform will be larger when the UPS with PI control has a nonlinear load Distortion

A single control method often cannot achieve excellent control effects in practical applications, and the introduction of new control algorithms and multiple composite control algorithms has become a trend in UPS power control

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