Control method of T-source variable frequency speed control system

A variable frequency speed regulation, source type technology, applied in the control system, AC motor control, electrical components and other directions, can solve the problems of low efficiency, high cost, complex structure, etc., to achieve the effect of high efficiency, compact structure and high reliability

Inactive Publication Date: 2013-01-23
HARBIN EAST ALARM EQUIP DEV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a control method for a T-source type frequency conversion speed regulation system, which can drive an AC motor with a higher rated voltage with a lower fluctuating DC power supply, so as to solve the problems of low efficiency, complex structure, and low cost of existing solutions. higher question

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  • Control method of T-source variable frequency speed control system
  • Control method of T-source variable frequency speed control system
  • Control method of T-source variable frequency speed control system

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specific Embodiment approach 1

[0021] Specific implementation mode one: Combine below Figure 1 to Figure 5 This embodiment will be specifically described. figure 1 It is the schematic diagram of the T source type frequency conversion speed regulation system, and its composition includes a diode (1) at the DC positive input terminal, a transformer (2), a filter capacitor (3), an inverter (4), a speed sensor (5), a level Conversion circuit (6), AC current detection circuit (7), bias circuit (8), DC voltage detection circuit (9), low-pass filter circuit (10), main controller (11) and isolation drive circuit (12) ;

[0022] The anode of the diode (1) is connected to the positive output terminal of the external DC power supply as the positive input terminal of the T-source AC inverter power supply, and the cathode of the diode (1) is connected to the input terminal of the transformer (2) , the first output terminal of the transformer (2) is connected to the DC positive input terminal of the inverter (4), th...

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Abstract

The invention relates to a control method of a T-source variable frequency speed control system, which belongs to the field of electric energy transformation. The control method comprises adding a diode at a DC (direct current) positive input end, a DC-side transformer and a filtering capacitor on the DC side on the basis of a three-phase inverter; the inverter generating a shoot-through state further to realize DC-side voltage transformation; adding a DC voltage close-loop control algorithm to realize a constant DC voltage; arranging an AC (alternating current) current detection circuit, a bias circuit and a speed sensor to obtain the electric quantity signal of an AC motor; and controlling the rotation speed of the AC motor by a motor variable frequency speed control algorithm. The control method provided by the invention can drive the AC motor with higher rated voltage to run by using a lower DC voltage by adding the diode, the transformer and the filtering capacitor on the DC signal, realizing DC voltage boosting and stabilizing control based on the shoot-through state generated by the inverter, and using the motor control algorithm. The method can realize the DC voltage boosting and stabilizing control at the same time and the AC motor running control by using a primary circuit structure and less energy storage components, and has the advantages of compact structure, high DC voltage utilization rate, high reliability and so on.

Description

technical field [0001] The invention relates to a control method of a T-source type frequency conversion speed regulation system, belongs to the field of electric energy conversion, and is used for converting a lower DC voltage into a higher stable DC voltage and driving an AC motor to run. Background technique [0002] As a device for converting electrical energy into mechanical energy, AC motors have been widely used in daily life and industrial production. In today's society, with the development of renewable energy power generation technology and other distributed power generation technologies, the forms of power supply are characterized by diversity. The power supply form of the AC motor and its speed control system is not limited to the power supply only by the public power grid, but also needs to be powered by a power source that adapts to low voltage and large fluctuation characteristics. For example, in remote areas without a public power grid, you can use Photovol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08
Inventor 李宣南朴顺善毛飞
Owner HARBIN EAST ALARM EQUIP DEV
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