A control system and control method of an indirect space vector matrix converter based on a 60° coordinate system

Abstract

The invention relates to a control system and control method of an indirect space vector matrix converter based on a 60-degree coordinate system. The control system includes a bilateral switch matrix circuit which consists of power devices having a bidirectional blocking capability and an automatic turning-off capability, a 3*3 switch array is formed, each output phase is connected with a three-phase input end through a bilateral switch, and a three-phase alternating current power supply is connected with the bilateral switch matrix circuit through an input filter with damping resistance. The control method includes the steps of: 1. calculating virtual direct current side voltage and virtual direct current side current in a virtual alternating current-direct current-alternating current structure; 2. determining an output voltage duty ratio and an output current duty ratio; 3. determining vector action time and a vector distribution condition; and 4. determining switching-on and switching-off of switching tubes. The control system of the indirect space vector matrix converter based on the 60-degree coordinate system is a stable, efficient and reliable electric power conversion device, and has the advantages of wide output frequency modulation and amplitude modulation, sinusoidal input and output waveforms, large degree of freedom of control, bidirectional flow of energy, fast dynamic response and the like.

Description

Technical field: [0001] The invention relates to a power conversion device, in particular to a control system and a control method of an indirect space vector matrix converter based on a 60° coordinate system. Background technique: [0002] In the field of electrical transmission, the DC speed control system has the disadvantages of complex structure, high cost, inability to adapt to high-voltage, large-capacity, high-speed occasions, frequent maintenance, and environmental restrictions, while the AC speed control system has simple structure, low price, small moment of inertia, The advantages of fast dynamic response, small size, light weight, simple maintenance and adaptability to harsh environments have become a development trend in the field of electric drives. With the rapid development of power semiconductors and the maturity of PWM modulation technology, AC drive power has also been widely used in industrial automation, agricultural production and family life, and has ...

AI Technical Summary

Problems solved by technology

Due to the power conversion realized by the phase-shift trigger method, the current and voltage waveforms are seriously distorted and the harmonic content is rich, which has a great impact on the power grid and generators, and the frequency modulation range is relatively narrow, usually 1 / 3 to 1 of the power frequency / 2. Although the control method is relatively simple, the input power factor it can obtain is relatively low, and the control circuit is relatively complicated and the cost is high

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