Control system for I-type and T-type three-level bidirectional PWM (Pulse-Width Modulation) rectifiers

Abstract

The invention relates to the field of electronic power control, in particular to a control system for I-type and T-type three-level bidirectional PWM (Pulse-Width Modulation) rectifiers. The control system comprises an analog quantity data collecting and conditioning circuit, an IGBT (Insulated Gate Bipolar Translator) magnetic insulation drive circuit, a control circuit consisting of a DSP (Digital Signal Processor) and a CPLD (Complex Programmable Logic Device), a relay output and digital signal input device, and a fault recording and remote communication device, and is characterized in that a Hall sensor data collecting circuit, an IGBT drive circuit and an input and output interface circuit are connected with a CPLD chip; a communication circuit and a fault recording circuit are connected with the DSP; and the DSP and the CPLD are connected with interrupt signals through data, an address bus and a PWM output signal. The control system can be compatible with T-type and T-type three-level topology frameworks, the control system adopts a control framework of the DSP and the CPLD, and the CPLD is responsible for logic control, three-level PWM signal detection and correction functions and the like as a coprocessor, so that the system reliability is improved, and the budget burden of the DSP is alleviated.

Description

technical field [0001] The invention relates to the field of electronic power control, in particular to an I-type and T-type three-level bidirectional PWM rectifier control system. Background technique [0002] With the increasing number of distributed energy equipment connected to the grid and the rapid development of smart grids, distributed power generation equipment such as photovoltaic inverters and wind power converters are connected to the grid; charging piles for new energy vehicles need AC voltage conversion first The DC voltage enters the DCDC control link; the above equipment requires a PWM inverter or rectifier. The PWM rectifier with bidirectional flow not only exhibits AC / DC conversion characteristics (rectification), but also exhibits DC / AC conversion characteristics (active inverter), so to be precise, this type of PWM rectifier is actually a A new type of reversible PWM converter. The three-level topology is divided into I-type three-level topology and T-t...

AI Technical Summary

Problems solved by technology

PWM rectifier control requires complex mathematical operations. Traditional inverters mostly use a single DSP structure, which has the disadvantages of relatively slow operation speed and untimely dynamic response, and cannot meet the needs of increasingly complex control algorithms.

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