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Method, system and control method for improving power factor of inverter air conditioner

A power factor improvement, air conditioner technology, applied in heating and ventilation control systems, heating and ventilation safety systems, output power conversion devices, etc. problem, to achieve the effect of improving the power factor

Active Publication Date: 2021-07-30
SHANGHAI MITSUBISHI ELECTRIC&SHANGLING AIR CONDITIONER & ELECTRIC APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Based on the above reasons, due to the use of reactors in the indoor unit and the large inductance, there will be a phase difference between the current of the whole machine and the voltage of the whole machine, and the power factor will deteriorate. The larger the angle of the phase difference, the worse the power factor will be. The lower the active power of the machine, the lower the efficiency of electric energy utilization. Therefore, it is necessary to propose a technical implementation plan that can effectively reduce the phase difference between the machine voltage and the machine current to improve the power factor effect.

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  • Method, system and control method for improving power factor of inverter air conditioner
  • Method, system and control method for improving power factor of inverter air conditioner
  • Method, system and control method for improving power factor of inverter air conditioner

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Embodiment Construction

[0057] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0058] Usually an air conditioning system consists of figure 2 In the indoor unit and outdoor unit shown, the indoor unit consists of several indoor units. When working, if the current of the whole unit lags the voltage of the whole unit by a certain angle between the zero crossing point of the voltage of the whole unit and the zero crossing point of the current of the whole unit (this angle is phase difference), when the voltage and current phases are inconsistent, inductive reactive power will appear, and the whole unit cannot effectively convert the electrical energy into the mechanical energy of the motor. (With or without a reactor, the inductance of the reactor is the same or different), therefore, when the system has no reactor, the current and voltage waveforms are as follows figure 1 As shown, there is...

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Abstract

The invention discloses a method for improving the power factor of an inverter air conditioner. The inverter air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes several indoor units. Each indoor unit has the same or different reactors. The inductance of the indoor unit is the same or different. In the case where the indoor unit has a reactor, the outdoor unit can reduce the zero-crossing point of the whole machine voltage and the over-current of the whole machine The phase difference between zero points; wherein, the additional PFC action refers to: increasing the positive current of the whole machine in the positive half cycle and / or raising the negative current of the whole machine in the negative half cycle. Its advantage is: to achieve the effect of improving the power factor.

Description

technical field [0001] The present invention relates to the technical field of air conditioner products, in particular to a method and system for improving the power factor of an inverter air conditioner (PFC, Power Factor Correction, a method for suppressing the distortion of the current waveform and improving the power factor) and control methods. Background technique [0002] In air conditioner products, there are the following situations: 1. The indoor unit uses a DC motor, and a reactor is added to counteract high-order harmonics; 2. In order to achieve a high static pressure of the indoor unit buried in the sky, an inductor is used 3. In the multi-split system, there are many ways to combine the indoor units equipped with reactors in parallel. [0003] Based on the above reasons, due to the use of reactors in the indoor unit and the large inductance, there will be a phase difference between the current of the whole machine and the voltage of the whole machine, and the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/32F24F11/56F24F11/64F24F11/70F24F11/88H02M1/42
CPCF24F11/32F24F11/56F24F11/64F24F11/70F24F11/88H02M1/4208Y02B70/10
Inventor 龚诣恒张旻甲斐昭裕
Owner SHANGHAI MITSUBISHI ELECTRIC&SHANGLING AIR CONDITIONER & ELECTRIC APPLIANCE CO LTD