A three-phase-single-phase AC converter control method
A converter control, single-phase AC technology, applied in the conversion of AC power input to AC power output, AC power input to DC power output, output power conversion device, etc., can solve the problem of large filter inductance value affecting the converter Service life and stability, filter increases the size and cost of the three-phase-single-phase conversion system, etc., to achieve the effect of flexible adjustment of amplitude and frequency
Active Publication Date: 2018-02-09
无锡市亿东电子有限公司
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Problems solved by technology
The filter inductance value in the topology of the current-mode AC-DC-AC converter is relatively large, which affects the volume and weight of the converter
The electrolytic capacitor of the voltage-type converter has reliability problems, which affects the service life and stability of the converter
[0003] Compared with the AC-DC-AC converter, the traditional AC-AC converter (cyclo converter) has the advantage of having no intermediate DC energy storage link and can realize four-quadrant operation, but its disadvantages are: the frequency of the output voltage It must be much lower than the frequency of the input AC power supply. Generally, the frequency of the output power supply is required to be at least 1 / 3 lower than the frequency of the input power supply, otherwise the output voltage waveform is very poor.
The existence of the filter increases the size and cost of the three-phase-single-phase conversion system
Method used
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[0022] Such as figure 1 As shown, a three-phase-single-phase AC converter control method is characterized in that the two ends of the three-phase winding on the secondary side of the three-phase transformer are respectively connected to the inverter INV1 and the inverter INV2, and the inverter INV1 The capacitor C1 is connected to the DC side, and the capacitor C2 is connected to the DC side of the inverter INV2. The three-phase current of the three-phase winding on the secondary side of the three-phase transformer i a , i b , i c And the voltage on capacitor C1, capacitor C2 u 1d and u 2dThe drive signal is input to the controller for calculation to drive the inverter INV1 and the inverter INV2 respectively to control the output of the single-phase side to be a sinusoidal AC voltage.
[0023] Attached below figure 2 The technical scheme of the present invention is described in detail:
[0024] (1) Collect the capacitor voltage on the DC side of inverter INV1 and...
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The present invention relates to the technical field of AC converters, in particular to a three-phase-single-phase AC converter control method, which connects the two ends of the three-phase windings on the secondary side of the three-phase transformer to the inverter INV1 and the inverter INV2 respectively, and The DC side of the inverter INV1 is connected to the capacitor C1, and the DC side of the inverter INV2 is connected to the capacitor C2. A current sensor is installed at the three-phase winding on the secondary side of the three-phase transformer, and a voltage sensor is respectively installed at the capacitor C1 and the capacitor C2. The three-phase current ia, ib, ic of the three-phase winding on the secondary side of the three-phase transformer collected by the current sensor and the voltage u1d and u2d on the capacitor C1 and capacitor C2 are input to the controller for calculation to obtain the drive signal to drive the inverter respectively. Inverter INV1 and inverter INV2 can obtain high-quality single-phase AC voltage output on the single-phase side.
Description
technical field [0001] The invention relates to the technical field of AC converters, in particular to a three-phase-single-phase AC converter control method. Background technique [0002] Three-phase-single-phase converters can provide single-phase AC power for single-phase electrical equipment, and can also be used in switching power supplies to convert three-phase power-frequency AC power into single-phase high-frequency AC power for high-frequency induction heating, etc. field. Three-phase-single-phase converters can be divided into AC-DC-AC converters and AC-AC converters. AC-DC-AC converters can be divided into voltage type and current type according to different energy storage elements. The filter inductance value in the topology of the current-mode AC-DC-AC converter is relatively large, which affects the volume and weight of the converter. The electrolytic capacitor of the voltage source converter has reliability problems, which affects the service life and stabi...
Claims
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IPC IPC(8): H02M5/458H02M7/5387
Inventor 何健魏佳丹周勇
Owner 无锡市亿东电子有限公司