Double pulse width modulation controller for back to back structure voltage type current changing device

Abstract

This invention relates to a double-pulse width modulation controller of a back to back structure voltage deflector characterizing in including two sets of same structured digital signal processor circuits and a site programmable gate array circuits, a synchronous unit circuit, an A / D conversion regulation circuit, an overvoltage-overcurrent regulation circuit, a serial communication circuit, a fault, state indication circuit and a control supply circuit, in which, the DSP of the digital signal processor circuit is used for A / D conversion, upper layer control algorithm, pulse width modulation, generation of pulses and serial communication control in the bottom layer control, the two I / O ports of the digital signal processor circuit and the site programmable gate array circuit are connected for the communication of the working state between them and application in different fields by programming not necessary to alter the hardware circuit.

Description

technical field [0001] The invention relates to the technical field of control, and relates to a dual pulse width modulation controller of a back-to-back structure voltage-type converter. Background technique [0002] Due to the enormous economic benefits it can generate, power electronics has become a fundamental technology and is widely used in various industries. Back-to-back structure voltage-type converters can be used to connect synchronous or asynchronous AC systems to achieve flexible control of the active power and reactive power of the AC systems at both ends, and thus have been widely used, such as light DC transmission systems in the field of power transmission, Unified power flow controller UPFC, frequency conversion speed control system with two-way flow of electric energy in industrial energy saving, AC excitation speed control controller of double-fed induction generator in variable speed constant frequency wind power generation system, etc. [0003] The bac...

AI Technical Summary

Problems solved by technology

The existing pulse width modulation controller uses a digital signal processor DSP to complete the upper layer control, and then uses a DSP and a digital circuit composed of discrete components to complete the bottom layer control, plus peripheral circuits such as signal acquisition, status and protection signal processing, etc. The disadvantages are: 1. Communication between two DSPs is required, and a large number of peripheral circuits need to be assisted, which makes the structure of the controller complex; 2. The digital circuit composed of discrete components is inconvenient to set the control parameters, such as the bridge The setting of parameters such as arm dead time, minimum turn-on and minimum turn-off time of power electronic devices, and the setting value will produce errors with the change of discrete device parameters

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