Network side power factor and harmonic suppression strategy of isolated AC-DC matrix converter

A matrix converter and power factor technology, which is applied in the direction of conversion of AC power input to AC power output, conversion of AC power input to DC power output, output power conversion device, etc., can solve the problem of harmonious power factor control on the grid side of the converter There are very few studies on wave suppression, etc.

Pending Publication Date: 2020-08-04
XIANGTAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

At present, domestic and foreign scholars' research on the isolated AC-DC matrix converter is mainly on the modulation strategy and co

Method used

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  • Network side power factor and harmonic suppression strategy of isolated AC-DC matrix converter
  • Network side power factor and harmonic suppression strategy of isolated AC-DC matrix converter
  • Network side power factor and harmonic suppression strategy of isolated AC-DC matrix converter

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Embodiment Construction

[0067] like figure 1 As shown, the isolated AC-DC high-frequency chain matrix converter used in this embodiment consists of a three-phase power supply, an input LC filter, a three-phase-single-phase AC-AC matrix converter, a high-frequency transformer, an H-bridge converter, and an output LC Filter and load composition. The three-phase-single-phase matrix converter is composed of two-way switches composed of 12 IGBTs, which convert the grid-side power frequency alternating current into positive and negative alternating single-phase high-frequency alternating current, and realize the electrical isolation and voltage of the input and output sides through the high-frequency transformer. After the lift conversion, the high-frequency alternating current is converted into direct current through the H-bridge converter, and both the three-phase-single-phase matrix converter and the H-bridge converter can realize the bidirectional flow of energy.

[0068] like figure 2 As shown, the...

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Abstract

The invention discloses a network side power factor and harmonic suppression strategy of an isolated AC-DC matrix converter. The method comprises the steps of firstly, introducing a virtual capacitor,and enabling virtual capacitor current generated under different loads to completely or partially compensate a phase difference between network side voltage and current caused by an input filter, sothat the IAMC works in a network side unit power factor state or a maximum achievable unit power factor (MAPF) state; and secondly, introducing a virtual resistor and connecting with a filter capacitor in parallel to form active damping control, and enabling the generated virtual damping current to effectively reduce harmonic waves of network side current under the condition of not increasing extra loss; and finally, compensating the virtual capacitance current and the virtual damping current to the reference current, and calculating a new modulation coefficient and a phase angle to realize acoordination control strategy of current space vector and phase shift control. According to the invention, the network side power factor of the converter can be controlled, the harmonic content of network side current is reduced, direct-current side ripple waves are suppressed, and it is guaranteed that the system has good input and output performance.

Description

technical field [0001] The invention relates to the field of high-frequency chain-matrix rectification, in particular to an isolated AC-DC matrix converter and a grid-side power factor control and harmonic suppression method. Background technique [0002] The PWM rectifier has the advantages of high degree of sinusoidal current on the grid side; controllable power factor on the grid side; energy can flow in both directions; fast dynamic response, etc., but the PWM rectifier cannot meet the voltage required by the equipment. If a power frequency transformer is introduced on the input side of the PWM rectifier, although the voltage required by the equipment can be met, the volume and weight of the system will increase, and the hardware cost will increase. Therefore, considering the introduction of a high-frequency transformer into the PWM rectifier, it can not only make the output voltage range of the converter larger, realize the electrical isolation of the input and output s...

Claims

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Application Information

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IPC IPC(8): H02M5/293H02M7/797H02M1/42H02M1/12
CPCH02M5/293H02M7/797H02M1/4216H02M1/12Y02B70/10
Inventor 邓文浪蒋娉平
Owner XIANGTAN UNIV
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