Air conditioning system
An air-conditioning system and drive system technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as the increase in the size of the inverter substrate, the increase in the system failure rate, and the current pulsation of the inverter, so as to suppress the output current pulsation, Improve the waveform and enhance the effect of carrying capacity
Active Publication Date: 2021-06-04
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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Problems solved by technology
However, due to the additional addition of some hardware circuits in this method, the size of the inverter substrate increases and the production cost increases; at the same time, the addition of new hardware circuits will lead to an increase in the system failure rate and a decrease in the overall reliability of the inverter, which will affect the quality of the air conditioning system.
[0004] In summary, it is now necessary to design an air conditioning system to solve the current pulsation problem of the electrolytic capacitor inverter in the prior art
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[0037] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0038] In the description of this application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying Refe...
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The invention provides an air conditioning system which comprises a driving system which is located in a compressor and comprises a frequency converter and a control module; the control module is used for calculating the d-axis correction output current id of the frequency converter by using a formula Id = idq * Kpi * sin (theta-delta theta); the idq of the d-axis correction output current id is a synthetic current value of d-axis and q-axis current vectors of the frequency converter at any moment t0, Kpi is a gain value, theta is a phase angle at any moment t0, and delta theta is a phase angle difference constant; and the control module is used for calculating the q-axis correction output current iq of the frequency converter by using a calculation formula: iq = idq' * Kpi * cos (theta-delta theta). According to the invention, the voltage fluctuation value is introduced, and the corresponding gain value is calculated according to the voltage fluctuation value, so that the output current is corrected; the output current pulsation of a non-electrolytic capacitor motor driving system caused by bus small capacitance and non-polar capacitance is effectively suppressed, the waveform of the output current is improved, and the load capacity of the non-electrolytic capacitor motor driving system is improved.
Description
technical field [0001] The invention relates to the technical field of air conditioning, in particular to an air conditioning system. Background technique [0002] Most of the existing air-conditioning systems use frequency converters without electrolytic capacitors. This frequency converter without electrolytic capacitors refers to replacing the electrolytic capacitors used for energy storage on the frequency converters with film capacitors to avoid the problems of low life and high temperature of electrolytic capacitors. At the same time, it has certain economic benefits; however, after using small-capacity film capacitors instead of large-capacity electrolytic capacitors, the bus voltage fluctuation of the inverter will cause periodic pulsation of the motor current. This problem has a certain impact on the load capacity and reliability of the inverter. [0003] At present, in the application of frequency converters without electrolytic capacitors, hardware circuits are u...
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IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 王秋晨李希志徐鹏洋李文阳
Owner QINGDAO HISENSE HITACHI AIR CONDITIONING SYST