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Two-phase inverted power system and comprehensive control method

A technology of power supply system and control method, which is applied in the direction of irreversible DC power input conversion to AC power output, electrical components, AC power input conversion to DC power output, etc., which can solve the problems of large harmonic content and grid side current power factor. Low-level problems, achieve high power factor, simple structure, and improve reliability

Inactive Publication Date: 2011-11-23
HUNAN UNIV +1
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  • Claims
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AI Technical Summary

Problems solved by technology

The shortcomings of low current power factor and large harmonic content on the grid side have not been overcome

Method used

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  • Two-phase inverted power system and comprehensive control method
  • Two-phase inverted power system and comprehensive control method
  • Two-phase inverted power system and comprehensive control method

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Embodiment Construction

[0029] see figure 1 (a) is a diagram of two kinds of inverter power supply systems in the prior art. in, figure 1 (a) is a two-phase inverter power supply composed of an uncontrollable rectifier bridge, two single-phase inverter bridges and their output inductance. The uncontrollable rectifier bridge contains 6 diodes and a DC capacitor, and provides DC voltage for two single-phase inverter bridges through diode rectification. The two single-phase inverter bridges respectively contain 4 power switch tubes and an output inductor, and share the DC side capacitor. The two single-phase inverter bridges can output the two single-phase currents of the reference command signal to supply the two single-phase loads. The disadvantage of this inverter power structure is that there are many power switching devices in the inverter, the harmonic content of the input current at the grid side is large, and the power factor is low.

[0030] figure 1 (b) is a diagram of a two-phase inverte...

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Abstract

The invention discloses a two-phase inverted power system and a control method. DC side voltage is obtained by adopting a three-phase power width modulation (PWM) rectifier to realize a high voltage factor of a power grid side and reduce energy loss. Simultaneously, a two-phase inverter only comprises four power switching tubes, and compared with a conventional two-phase inverted power supply, the two-phase inverted power system cancels a switch arm to make the structure of the two-phase power supply simpler, greatly reduce cost and improve system reliability. The three-phase PWM rectifier adopts a double-closed loop control strategy consisting of a voltage outer loop and a current inner loop to realize high-precision control over the voltage of a DC side and the high-power factor control over the current of the power grid side. The double-closed loop control strategy consisting of voltage sharing outer loop control and output current inner loop control over two series-wound capacitors on the DC side realizes the rapid tracking of output current and the voltage sharing of the two capacitors on the DC side.

Description

technical field [0001] The invention relates to a two-phase inverter power supply system and a comprehensive control method thereof. Background technique [0002] In industrial and residential electricity consumption, most of the electricity loads are three-phase loads and single-phase loads. But in some special industrial occasions, there are two-phase loads. For example, in the metallurgical continuous casting industry, the metallurgical continuous casting electromagnetic stirrer requires a two-phase low-frequency orthogonal power supply for excitation; a single-phase asynchronous motor has two orthogonal stator windings and also requires a two-phase power supply for excitation. When the two-phase motor with two-phase power supply is applied to the rotor field-oriented control, because the two-phase windings of the stator are naturally orthogonal, it reduces a step from the three-phase coordinate system to the two-phase coordinate system compared with the vector control o...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M7/537H02M7/219
Inventor 罗安吴传平孙运宾马伏军王晓肖华根楚烺
Owner HUNAN UNIV
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