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Input current closed-loop amplitude limiting method and system during grid voltage drop of air conditioning system

A technology of input current and grid voltage, applied in control systems, vector control systems, motor generator control, etc., can solve problems such as damaged input circuits, air-conditioning system failures, increased input current, etc., to reduce input current and ensure Normal operation, fast response effect

Active Publication Date: 2015-09-30
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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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 amplitude limiting method and system during grid voltage drop of air conditioning system
  • Input current closed-loop amplitude limiting method and system during grid voltage drop of air conditioning system
  • Input current closed-loop amplitude limiting method and system during grid voltage drop of air conditioning system

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Embodiment Construction

[0034] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not 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 the 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 flows as figure 1 shown. When the input grid voltage drops, the input current will rise sharply; if the load power remains unchanged, the input current rise ratio is inversely proportional to t...

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Abstract

The invention relates to an input current closed-loop amplitude limiting method and system during a grid voltage drop of an air conditioning system. The method comprises the following steps: limiting the amplitude of electromagnetic torque compensation TeComp through an input current effective value and an input current effective value protective threshold value; adjusting the electromagnetic torque given quantity Te_ref through the electromagnetic torque compensation TeComp with limited amplitude to obtain the final electromagnetic torque given quantity for compressor operation; processing the final electromagnetic torque given quantity for compressor operation through a maximum torque / current ratio control module to obtain the direct-axis current given quantity Id_ref and the quadrature-axis current given quantity Iq_ref; performing vector control on a compressor to realize limiting on the input current effective value Iin_rms. According to the method, during the grid voltage drop, the operation efficiency of the compressor is limited through limiting the output electromagnetic torque of the compressor, the effects of reduction of the compressor power and reduction of the input current are realized, the method has a high response speed, the input current is within the overcurrent capacity of an input circuit, the circuit is prevented from being damaged, and normal operation of the system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method and a system for closed-loop amplitude limiting of input current when the grid voltage of an air conditioning system drops. Background technique [0002] In household air conditioners and other similar systems, the single-phase AC power supply from the power grid is generally firstly rectified by an uncontrollable full-bridge, and then passed through a power factor correction (PFC) circuit to output a DC power supply, which is connected to a large-capacity electrolytic capacitor. , supply power to the load. The load includes the compressor and the internal switching power supply of 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] The Boost power factor correction circuit is generally used in the air conditioning system, which can not...

Claims

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Application Information

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