Analog impedance control method for suppressing influence of input imbalance of AC/DC matrix converter
A matrix converter and impedance control technology, applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., can solve the problems of too many sensors and parameter dependence
Active Publication Date: 2021-02-09
CENT SOUTH UNIV
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[0004] In view of the above problems, the present invention provides an analog impedance control method that suppresses the influence of AC / DC matrix converter input imbalance, which can achieve the purpose of controlling the sinusoidal input current and constant output DC current, and solves the problem of the number of sensors used in the prior art. Too many and parameter dependence problems, this patent suppresses the analog impedance control method of AC / DC matrix converter input unbalanced influence, it is characterized in that, under unbalanced voltage, sinusoidal input current and constant DC current can be obtained; specific steps as follows,
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[0089] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0090] The invention provides an analog impedance control method for suppressing the influence of input unbalance of an AC / DC matrix converter, which can achieve the purpose of controlling the input current sinusoidal and the output DC current constant, and solves the problem of using too many sensors and parameter dependence in the prior art question.
[0091] like figure 1 As shown, an AC / DC matrix converter with an input sinusoidal current and a constant DC current under unbalanced conditions includes an AC voltage source and an input inductance L f , and the input capacitance C f , three-phase inverter bridge, large inductance L on the DC side, DC voltage source; input inductance L f In series with the voltage source, the input capacitor C f The lines connected by inductance are connected in parallel. The large inductance on the DC side...
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The invention discloses an analog impedance control method for suppressing influence of input imbalance of an AC / DC matrix converter. According to the analog impedance control method, firstly, the external characteristics of the AC / DC matrix converter in a corrected static coordinate system are disclosed, expected input current is obtained through a coordinate system self-adaptive correction strategy, direct current decomposition and analog impedance construction, and finally, space vector modulation is adopted to synthesize expected current. According to the method, only the capacitor voltageand the direct current need to be measured, the cost of the system is reduced, and the robustness of the system is improved to a certain extent. Besides, the method does not depend on input filter parameters, so that the parameter robustness is high, and the provided method has a guiding effect on imbalance control methods of other three-phase AC / DC converters.
Description
technical field [0001] The invention belongs to the technical field of AC power conversion devices, and relates to an analog impedance control method for suppressing the influence of AC / DC matrix converter input unbalance. Background technique [0002] The three-phase current-source rectifier is a single-stage buck-type converter, which has the advantages of reliable short-circuit protection, high reliability (no need for electrolytic capacitors), wide range of DC voltage regulation, and limited inrush current, so it is used in electric aircraft, data centers, etc. System, fuel cell power supply system and other fields have broad application prospects. However, the three-phase current-mode rectifier realizes bidirectional power flow only if the polarity of the output voltage can be reversed, which limits its application in some fields. In order to solve this problem, an AC / DC matrix converter is proposed, which inherits the advantages of matrix converter and current source ...
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IPC IPC(8): H02M7/219
CPCH02M7/219H02M1/0012
Inventor 熊文静易书栋林建亨但汉兵孙尧粟梅许国
Owner CENT SOUTH UNIV