RKC converter – the control strategy of the converter

Create Date: 2024-8-30 12:03:23|Source: RKC

Direct transformation method

The direct conversion method is to synthesize the "output voltage" through the continuous chopper of the input voltage, which can be divided into coordinate transformation method, harmonic injection method, equivalent conductivity method and scalar method, although all these methods have certain advantages, but also have certain problems, limiting their application scope. For example, the input phase current waveform of the scalar method is better, but the output harmonic is larger.

Current tracking method

This method compares the three-phase output current signal with the measured output current signal, and determines the switching action according to the comparison results and the current switching power supply state, which has the characteristics of easy to understand, simple implementation, fast response, good robustness, etc., but also has the common shortcomings of hysteresis current: the switching frequency is not stable enough, the harmonics are randomly distributed, and the input current waveform is not ideal, and there are large harmonics.

Indirect transformation method

Space vector modulation technology, also known as indirect transformation method, AC-DC-AC equivalent transformation method, is a method based on space vector transformation, which virtualizes the AC-AC transformation into AC-DC and AC transformation, so that the popular high-frequency rectification and high-frequency PWM waveform synthesis technology can be adopted, and the performance of the converter can be greatly improved. Of course, the rectification and inverter are completed in one step, and the lower harmonics are well suppressed, but the control scheme is more complex and lacks effective dynamic theoretical analysis support. It is a more researched and mature control strategy in matrix converters, and it is more promising. This modulation strategy can control both the output waveform and the input current waveform, and can change the input power factor, which is the most promising modulation strategy.

RKC converter – the control strategy of the converter

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