High-frequency linear generator analog power supply system and control method thereof

Abstract

The invention relates to a high-frequency linear generator analog power supply system and a control method thereof. The system comprises a voltage transformation part, an impedance simulation part, acontrol part and an execution mechanism, the voltage transformation part adopts a cracking transformer to form a DC bus isolated H-bridge cascaded five-level circuit, and the output end of the voltagetransformation part is connected with the impedance simulation part. The control end of the execution mechanism is connected with the voltage transformation part and the impedance simulation part, and the execution mechanism is further connected with the control part to achieve a local control function. According to the method, a segmented asynchronous modulation method is adopted, multi-working-condition testing is carried out on output characteristics, per unit values of the output characteristics are calculated, and curve fitting is carried out; and curves under different frequency division conditions are selected according to the magnitude of the load current and the subsection interval of the initial given frequency, and the output voltage is accurately controlled. According to the present invention, the ripple waves of output voltage waveforms can be effectively reduced, and the output voltage quality and the output frequency precision are improved; and the system and the methodhave the characteristics of short response time, no need of feedback quantity, no delay response and the like.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to a high-frequency linear generator analog power supply system and a control method thereof. Background technique [0002] With the wide application of linear generators in the fields of logistics sorting, CNC machine tools and transportation, the demand for linear generator analog power supply equipment has begun to appear. The high-frequency linear generator analog power supply is designed according to the external characteristics of linear generators, which can simulate linear generators. Any operating condition of the generator. The external characteristics of the linear generator are mainly manifested in that the output voltage is proportional to the output frequency, the self-inductance is a fixed value, and the internal resistance changes in a specific curve with the frequency. Obviously, the existing conventional variable frequency power supply cannot meet the re...

AI Technical Summary

Problems solved by technology

Obviously, the existing conventional variable frequency power supply cannot meet the requirements of the external characteristics of the linear generator

[0003] In the control method of high-frequency power supply, the PWM method of conventional frequency converter is generally divided into synchronous modulation and asynchronous modulation. The synchronous modulation method keeps the carrier ratio unchanged, and is mainly used in inverters with fixed output frequency, because this modulation mode is in low frequency When the frequency converter output harmonic content becomes larger; the asynchronous modulation method keeps the carrier frequency unchanged, and the modulation ratio changes according to the output frequency. This modulation method cannot simultaneously meet the accuracy requirements of high-frequency output and low-frequency output.

The real-time frequency conversion system with a wide frequency range requires not only output accuracy, but also high response speed. When the closed-loop control is used, the output accuracy is high, and the adjustment process does not meet the high real-time response requirements; when the open-loop control is used, it can be completed in an instant. control logic, but how to improve the output voltage accuracy in open-loop control mode is particularly important

Images