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Converter parallel control method based on average power feedback

A technology of frequency converter control and average power, which is applied in control systems, control generators, vector control systems, etc., and can solve problems such as increasing equipment volume and increasing equipment costs

Active Publication Date: 2014-08-06
WISDRI WUHAN AUTOMATION
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods all increase the cost of the equipment and increase the volume of the equipment

Method used

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  • Converter parallel control method based on average power feedback
  • Converter parallel control method based on average power feedback
  • Converter parallel control method based on average power feedback

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Embodiment Construction

[0053] A frequency converter control method based on average power feedback. Each frequency converter in the frequency converter parallel system converts the actual three-phase output current of the frequency converter into Two-phase relative static current in the rotating coordinate system, and then combine the controller to obtain the reference control voltage in the two-phase rotating coordinate system, and obtain the active power and reactive power of a single inverter in the system; each inverter in the parallel system All inverters receive the active power and reactive power information of other parallel inverters in the system, and calculate the average active power and average reactive power of the inverter parallel system; each inverter in the system is based on the average active power and reactive power Active power is used to adjust its own active power and reactive power, so that each inverter conforms to the power distribution of the inverter parallel system.

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Abstract

The invention provides a converter parallel control method based on average power feedback, and the control method is characterized in that each frequency converter in a frequency converter parallel system changes real three-phase output current of the frequency converter to two phases of relatively stationary current in a rotary coordinate system through a coordinate converter from a three-phase stationary coordinate system and a two-phase rotary coordinate system, then reference control voltage in the two-phase rotary coordinate system is obtained through the controller, and then active power and reactive power of single frequency converter in the system are obtained; each frequency converter in the system receives the active power information and reactive power information of other frequency converters in parallel connection, and the average active power and the average reactive power of the system are calculated; and each frequency converter in the system adjusts own active power and reactive power according to the average active power and the average reactive power, so that each frequency converter conforms to the power allocation of the system. By adopting the control method, when multiple identical frequency converters are in parallel connection with one another to supply power to a motor, the power of each frequency converter is identical, and the parallel connection of the frequency converter can be realized on the basis that the cost is not increased.

Description

technical field [0001] The present invention is applied in the field of high-power transmission, specifically the occasion where a plurality of frequency converters with relatively low power work together to jointly control a relatively high-power motor. Background technique [0002] With the advancement of science and technology, AC drives are used more and more in today's industries. Correspondingly, 70% of our daily power generation is consumed by transmission equipment, which shows that transmission is the main force of energy consumption. With its excellent energy-saving and consumption-reducing capabilities and excellent speed control accuracy, frequency converters have gradually become the standard control equipment for transmission equipment in the past 10 years, and there are more and more applications for them. [0003] The current inverter products generally use IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) as a power device, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/14H02P21/08
Inventor 余骏王国强王胜勇卢家斌李传涛李四川李海东
Owner WISDRI WUHAN AUTOMATION
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