System and method for controlling matrix converter space vector modulation strategy

Abstract

The invention relates to a system and method for controlling a matrix converter space vector modulation strategy. The control system includes a matrix converter main circuit, a load current direction signal detection circuit, an input voltage signal detection circuit, a CPU controller, a 2-4 decider and a four-step conversion logic circuit; an output end of the four-step conversion logic circuit is connected with input ends of nine bidirectional power switches of the matrix converter main circuit; an output end of the load current direction signal detection circuit is connected with a current input end of the four-step conversion logic circuit; an output end of the input voltage signal detection circuit is connected with a voltage input end of the CPU controller; an output end of the CPU controller is connected with an address input end of the 2-4 decoder; and an output end of the 2-4 decoder is connected with a control input end of the four-step conversion logic circuit. According to the control system provided by the invention, a control circuit is simplified, the work efficiency of the four-step conversion logic circuit is improved, the fault rate of the system is reduced, and the control performance of the system is improved.

Description

technical field [0001] The invention relates to the field of converter control for driving motors, in particular to a control system and a control method for a space vector modulation strategy of a three-phase matrix converter. The matrix converter has nine bidirectional power switches arranged in the form of a 3*3 switch matrix, and the bidirectional power switches are respectively composed of two semiconductor switches in reverse series. Background technique [0002] A matrix converter is a direct converter without an intermediate loop. By arranging the bidirectional power switches in the form of a 3×3 switch matrix, each of the three output phases of the matrix converter can be connected to an input, and each output phase can be connected to three inputs through three bidirectional power switches. connected. By controlling each bidirectional power switch, a given AC input can be directly converted into AC outputs of different voltages and frequencies, and a sinusoidal g...

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Problems solved by technology

In this way, too many output signals of the CPU controller lead to the need to increase the synchronization control of the signals between the signals, thereby increasing the difficulty of control. At the same time, due to the complex programmable logic device of the four-step commutation logic circuit (CPLD), it is necessary to realize decoding, delay and switching The sequence of three functions makes the software programming of the four-step commutation logic circuit (CPLD) complex programmable logic device too complicated, which eventually leads to the deterioration of the overall performance of the control system

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