Z-source three-level inverter and air conditioning system
A technology for three-level inverters and air-conditioning systems, applied to electrical components, AC power input to DC power output, output power conversion devices, etc., can solve the problem of high output common-mode voltage, high voltage conversion rate, harmonic High wave content and other problems, to achieve the effect of reducing AC harmonic voltage, low leakage current, and high quality of incoming grid current
Inactive Publication Date: 2016-03-30
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0003] In order to solve the defects in the above-mentioned existing technologies such as high voltage conversion rate, high output common-mode voltage and high harmonic content if the structure without an isolation transformer is used, or the use of an isolation transformer will cause the system to have high cost, heavy weight, large volume, and low conversion efficiency. Low technical problem, the present invention provides a kind of Z source three-level inverter
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[0021] In order to better illustrate the intention of the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings.
[0022] refer to figure 2 , figure 2 Shows a circuit structure diagram of a Z-source three-level inverter in an embodiment, the Z-source three-level inverter is mainly used in an air-conditioning system, and Upv in the figure represents the DC voltage output by the solar panel, The Z-source three-level inverter is connected with the intelligent power module (IPM), and the intelligent power module (IPM) is connected with the permanent magnet synchronous motor (PMSM), so that the permanent magnet synchronous motor (PMSM) can be controlled by the Z-source three-level inverter The magnetic synchronous motor (PMSM) operates. Specifically, the Z-source three-level inverter includes a voltage dividing capacitor, a first diode D1, a second diode D2, an X-shaped impedance network, and a bidi...
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Disclosed in the invention is a Z-source three-level inverter connected with an intelligent power module. The intelligent power module is connected with a permanent magnet synchronous motor. The Z-source three-level inverter consists of a voltage dividing capacitor, a first diode D1, a second diode D2, an X-shaped impedance network and a bidirectional converter. The bidirectional converter employs a half-bridge two-bridge-arm diode clamp three-level topological structure. Therefore, the low current and high network-entering current quality are realized; the voltage-withstanding level can be improved based on rectification; the alternating-current harmonic voltage and current are reduced; and the power factor is improved. Besides, the structures of the inverter and the system are simple and the efficiencies are high; the good disturbance suppression capability is good; and the steady-state error in the output current can be eliminated.
Description
technical field [0001] The invention relates to the field of inverters, in particular to a Z-source three-level inverter and an air-conditioning system containing the Z-source three-level inverter. Background technique [0002] The shortage of energy supply and the pressure of environmental protection have made clean and renewable energy power generation technology highly valued worldwide. Among them, photovoltaic power generation has the characteristics of no geographical restrictions, no fuel consumption, no pollutants and noise emissions, and has obvious advantages in providing clean and reliable power. At present, the photovoltaic industry is moving from "supplementary energy" to "alternative energy". Grid-connected converter is the core device of photovoltaic grid-connected power generation system, and its topology plays a vital role in conversion efficiency and cost control. When the upper and lower bridge arms of the traditional converter are directly connected, the...
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IPC IPC(8): H02M7/797
CPCH02M7/487
Inventor 宋泽琳郭清风张有林
Owner GREE ELECTRIC APPLIANCES INC