Kilovolt (KV) control method and system adopting digital technique

Abstract

The invention provides a kilovolt (KV) control method and system adopting a digital technique. The KV control system comprises a KV closed-loop control system and a phase-shifting pulse-width modulation (PWM) signal generation module. The KV closed-loop control system comprises an outer ring and an inner ring, wherein the outer ring adopts KV closed-loop control, and the inner ring adopts inversion current effective value closed-loop control. The KV closed-loop control system and the phase-shifting PWM signal generation module are achieved through a field programmable gate array (FPGA) unit. The FPGA unit comprises a KV control main program module, an analog-to-digital (AD) conversion module, a KV control unit and a phase-shifting PWM signal generation module, wherein the four modules achieve KV double closed-loop control together. The KV closed-loop control mode includes: reading KV feedback values and inversion current effective values for once in each PWM period, and obtaining the pulse width values to be output in the next PWM period by adopting a proportional integral derivative (PID) control flow according to the deviation between KV reference values and the KV feedback values and the inversion current effective values. By means of the KV control method and system, the problem existed in a KV control circuit of a high voltage power supply simulation technique can be solved, and the KV closed-loop control effect is ensured to be in accordance with the KV closed-loop control effect of an analog circuit under the double-loop control condition.

Description

technical field [0001] The present invention relates to the technical field of control circuits of high-voltage generators, and more specifically, relates to a KV control method and system using digital technology. Background technique [0002] High Voltage Power Supply (HVPS for short), also known as DC high voltage generator, is the traditional name of high voltage power supply, mainly referring to high voltage power supply used in insulation and leakage detection. The DC high-voltage generator is suitable for DC high-voltage tests and leakage currents of zinc oxide arresters, magnetic blower arresters, power cables, generators, transformers, switches and other equipment in power departments, scientific research units, railways, chemical industry, power plants, and large-scale enterprise power departments. test. [0003] At present, the KV control part of most high-voltage generators is mostly realized by analog circuits. Generally, operational amplifier circuits are used...

AI Technical Summary

Problems solved by technology

[0004] 1) Poor scalability and changeability once the circuit design is finalized;

[0005] 2) The control method is not flexible;

[0006] 3) Due to the use of discrete devices, the accuracy error of each device has an impact on the characteristics of the circuit;

[0007] 4) The area occupied by the circuit is relatively large

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