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Active filter low switching loss type circuit structure and compensating current modulation method

A switching loss and source filter technology, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as large amplitudes of medium and low harmonic currents, equipment damage, etc., to reduce switching The effect of reducing loss, ensuring compensation accuracy, and reducing the number of switching operations

Active Publication Date: 2015-05-06
STATE GRID CORP OF CHINA +1
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  • Claims
  • Application Information

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Problems solved by technology

When the traditional three-phase active filter compensates the harmonic current, due to the large amplitude of the middle and low harmonic current, the compensation current modulation method used in the prior art does not consider the voltage and the passing voltage of the power tube. The effect of the magnitude of the current on the switching loss
In this way, when the passing current is large and the withstand voltage is high, the switching loss of the active filter is obvious, which is easy to cause damage to the equipment

Method used

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  • Active filter low switching loss type circuit structure and compensating current modulation method
  • Active filter low switching loss type circuit structure and compensating current modulation method
  • Active filter low switching loss type circuit structure and compensating current modulation method

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Embodiment Construction

[0029] As shown in the figure, calculate the three-phase reference voltage modulation signal u of the active filter * abc And sample the compensation current I of the three-phase output fabc And judge the phase of the three-phase voltage modulation signal, and select two phases in the three phases as the phases that the modulation voltage signal may be clamped according to the phase.

[0030] The two-phase selection criterion that may be clamped is: two phases whose voltage phases are within 30°-150° and 210°-270°. Further compare the absolute values ​​of the actual output compensation currents of the two phases, and select the phase with the larger absolute value as the clamped phase.

[0031] The advantage of setting the modulation voltage clamping phase is that the modulation voltage of this phase can always be half of the DC bus voltage of the active filter, and the switching tube of this phase does not perform switching action.

[0032] Taking phase A...

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Abstract

The invention belongs to the technical field of three-phase active filtering, and in particular relates to an active filter low switching loss type circuit structure and a compensating current modulation method. The active filter low switching loss type circuit structure and the compensating current modulation method provided by the invention is good in compensating accuracy. The active filter low switching loss type circuit structure provided by the invention comprises an IGBT three-phase inverter bridge, a MOSFET three-phase inverter bridge and a capacitor. The structure is characterized in that the IGBT three-phase inverter bridge comprises a first IGBT, a second IGBT, a third IGBT, a fourth IGBT, a fifth IGBT, and a sixth IGBT; the MOSFET three-phase inverter bridge comprises a first MOSFET, a second MOSFET, a third MOSFET, a fourth MOSFET, a fifth MOSFET, and a sixth MOSFET.

Description

technical field [0001] The invention belongs to the technical field of three-phase active filtering, and in particular relates to a low switching loss circuit structure of an active filter and a compensation current modulation method. Background technique [0002] Electric energy is an indispensable and important energy source in modern society. The quality of electric energy in the power supply system is affected by nonlinear loads, which will inevitably generate harmonic currents, reduce energy utilization efficiency, and damage power equipment. Harmonic suppression devices mainly include passive filters and active filters. Among them, the three-phase active filter has better harmonic compensation performance than the passive filter, but the cost is higher. [0003] As a device for harmonic compensation using power electronic devices, the three-phase active filter has a very high switching frequency. When the traditional three-phase active filter compensates the harmoni...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 王城钧宿迎九刘挺刘斌于淼
Owner STATE GRID CORP OF CHINA
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