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Coping method and device for voltage swell of power grid of air-conditioning system

A technology for air-conditioning systems and power grid voltage, applied in emergency protection circuit devices, output power conversion devices, high-efficiency power electronics conversion, etc., can solve problems such as large charging current, input current prone to overcurrent faults, etc., and achieve improved robustness performance, reduce the input current amplitude, and reduce the effect of current impact

Active Publication Date: 2015-11-18
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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Problems solved by technology

[0003] However, when the grid voltage rises suddenly, due to the PFC circuit adjustment lag, the switch tube current in the PFC circuit rises suddenly and the input current overcurrent protection occurs. Moreover, when the grid voltage is higher than the DC bus voltage, the charging current of the electrolytic capacitor will be Very large, after being superimposed with the load current, the input current is prone to overcurrent faults

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  • Coping method and device for voltage swell of power grid of air-conditioning system
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  • Coping method and device for voltage swell of power grid of air-conditioning system

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Embodiment Construction

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0030] The following describes a grid voltage surge coping method for an air conditioning system and a grid voltage surge coping device for an air conditioning system according to embodiments of the present invention with reference to the accompanying drawings.

[0031] figure 1 is a flow chart of a method for responding to a power grid voltage surge of an air-conditioning system according to an embodiment of the present invention, wherein, as figure 2 or image 3 As shown, the air conditioning system includes a PFC circuit an...

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Abstract

The invention discloses a coping method and device for voltage swell of a power grid of an air-conditioning system. The method comprises the following steps: detecting input current Iin of a power factor correction (PFC) circuit and detecting input voltage Vbd of the PFC circuit; acquiring the phase of the input voltage Vbd, calculating an input voltage peak according to the input voltage Vbd, and calculating an input voltage estimation value Vest according to the phase of the input voltage Vbd and the input voltage peak; judging the input current Iin and a voltage difference value between the input voltage Vbd and the input voltage estimation value Vest; and if the input current Iin is greater than the preset maximum current Imax and the voltage difference value is greater than the preset voltage difference threshold deltaVmax, shutting off a switch tube drive signal of the PFC circuit, and shutting off a power module drive signal of a compressor. According to the method, the peak of the input current during voltage swell of the power grid can be effectively reduced, so that the current shock is reduced; and the robustness of the system is improved.

Description

technical field [0001] The present invention relates to the technical field of air-conditioning systems, in particular to a method for responding to sudden rises in grid voltage of an air-conditioning system and a device for responding to sudden rises in grid voltage of an air-conditioning system. Background technique [0002] In similar systems such as household air conditioners, the single-phase AC power from the power grid is rectified by a rectifier bridge, and then output DC through a PFC (Power Factor Correction) circuit to supply large-capacity electrolytic capacitors and loads (mainly compressors). A typical BOOST-type PFC circuit can not only achieve a higher power factor, but also boost and output a stable DC voltage, thereby providing a stable DC power supply to the load. [0003] However, when the grid voltage rises suddenly, due to the PFC circuit adjustment lag, the switch tube current in the PFC circuit rises suddenly and the input current overcurrent protecti...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02H7/12
CPCY02B70/10
Inventor 黄招彬
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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