Control method, system and equipment of UPS inverter and medium

Abstract

The invention discloses a UPS inverter control method, system and device and a medium. The system comprises a processing module, a fuzzy controller, a PI controller and a UPS inverter. The method comprises the steps that a processing module obtains a first input quantity according to the output voltage of the UPS inverter at the last moment, the expected output voltage of the UPS inverter and an input telescopic factor; inputting the first input quantity into a fuzzy controller so as to obtain a first output quantity through the fuzzy controller according to the first input quantity; the processing module obtains a second input quantity according to the voltage error change rate, the voltage error, the output scaling factor and the first output quantity; inputting the second input quantity into the PI controller, so as to determine a control signal through the PI controller according to the second input quantity; the UPS inverter operates according to the control signal, the anti-interference capability of the system is improved, and the system has faster dynamic response.

Description

technical field [0001] The present invention relates to the technical field of power electronic device control, in particular to a control method, system, equipment and medium of a UPS inverter. Background technique [0002] Uninterruptible power supply, referred to as UPS, is an important technical field of power electronics. It provides uninterrupted power input for loads when the mains power supply is insufficient or outage. This is to use the DC power of the battery on the UPS to pass through the inverter. Provides power to the load for alternating current. At the same time, the inverter also plays an isolation role, continuously suppressing the impact of power disturbances such as spikes and noise on the grid side on the load, and providing high-quality and stable power for the load. At present, the mainstream UPS control in engineering is mainly the voltage single-loop PI control and the double-loop control scheme of the voltage outer loop and the current inner loop. ...

AI Technical Summary

Problems solved by technology

[0003] Traditional UPS inverter PI controllers mostly adopt voltage single closed-loop control. This control method will only control the error when the output voltage is unstable due to load disturbance.

This method has weak suppression ability for load disturbance, poor anti-interference ability, and slow dynamic response of the system.

[0004] At present, the more advanced UPS inverter adopts the control method of voltage outer loop plus current inner loop. Since the change speed of current is faster than the change speed of voltage, it is better than the traditional inverter in terms of dynamic response, but this method needs to design two The PI controller separately controls the voltage outer loop and the current inner loop. The PI parameters alone are not enough to ensure the stability of the system output. It is necessary to establish an accurate mathematical model of the system to analyze the Bode diagram of the system to determine the two PI controller parameters. The parameter design in engineering is relatively complicated, and different parameters need to be designed according to the customer's demand for UPS, and the research and development cycle is long

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