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Input current closed-loop limiting method and system when grid voltage drops in air-conditioning system

A technology of input current and grid voltage, applied in the control system, vector control system, motor generator control and other directions, can solve the problems of air conditioning system failure, damage to input circuit, increase of input current, etc., to ensure normal operation, reduce The effect of input current and fast response speed

Active Publication Date: 2017-07-07
GD MIDEA AIR CONDITIONING EQUIP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the input grid voltage drops, the input current (before PFC) must increase because the load power is basically unchanged
However, the overcurrent capability of the input circuit is limited. When the input current is too large, the input circuit will be damaged, and then the air conditioning system will fail.

Method used

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  • Input current closed-loop limiting method and system when grid voltage drops in air-conditioning system
  • Input current closed-loop limiting method and system when grid voltage drops in air-conditioning system
  • Input current closed-loop limiting method and system when grid voltage drops in air-conditioning system

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Embodiment Construction

[0034] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0035] figure 1 The circuit topology of the embodiment of the present invention is a single-phase AC input system circuit with power factor correction, and the instantaneous value of the input current is detected by a resistance sampling method. The circuit components through which the input current mainly flows include a rectifier bridge, a capacitor, a sampling resistor, a PFC circuit, an electrolytic capacitor, an intelligent power module IPM, and a compressor, and the PFC circuit includes a reactor, a power switch tube, and a diode. current flow as figure 1 shown. When the input grid voltage drops, the input current will rise sharply; if the load power remains constant, the ratio of the input current rise is i...

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Abstract

The invention relates to an input current closed-loop limiting method and system when the grid voltage of an air-conditioning system drops, including limiting the amplitude of the electromagnetic torque compensation TeComp through the input current effective value and the input current effective value protection threshold; The torque compensation TeComp adjusts the electromagnetic torque given amount Te_ref to obtain the final electromagnetic torque given amount of the compressor; through the maximum torque current ratio control module, the final electromagnetic torque given amount of the compressor is processed to obtain the direct axis current given amount Quantitative Id_ref and quadrature axis current given quantity Iq_ref; and then carry out the vector control of the compressor to realize the limitation of the effective value of the input current Iin_rms. When the grid voltage drops, the present invention limits the compressor’s operating frequency by limiting the output electromagnetic torque of the compressor, thereby achieving the effect of reducing the power of the compressor and reducing the input current. The overcurrent capability of the circuit ensures that the circuit is not damaged, thereby ensuring the normal operation of the system.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a closed-loop limiting method and system for input current when the grid voltage of an air-conditioning system drops. Background technique [0002] In household air conditioners and other similar systems, generally the single-phase AC power from the power grid is firstly rectified by an uncontrollable full bridge, and then through a power factor correction (power factor correction, PFC) circuit, the output DC power is connected to a large-capacity electrolytic capacitor , to supply power to the load. The load includes the compressor and the switching power supply inside the system, among which the compressor is the main load, and the output power of the compressor accounts for more than 95% of the total input power at the rated output. [0003] Generally, Boost power factor correction circuits are used in air conditioning systems, which can not only achieve a higher po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/12
Inventor 黄招彬
Owner GD MIDEA AIR CONDITIONING EQUIP CO LTD
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