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Distributed control method for parallel operation of frequency converters

A technology of distributed control and frequency converter, which is applied in the direction of control system, AC motor control, intermediate conversion to DC conversion equipment, etc., can solve the problem of controller noise interference and non-modular development, and achieve good dynamic and static Parallel operation characteristics, simple realization and good anti-interference effect

Inactive Publication Date: 2018-06-05
张叡
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Problems solved by technology

[0004] In order to overcome the problems of controller noise interference and non-modular development, the present invention proposes a distributed control method for parallel operation of inverters

Method used

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  • Distributed control method for parallel operation of frequency converters
  • Distributed control method for parallel operation of frequency converters
  • Distributed control method for parallel operation of frequency converters

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Embodiment Construction

[0013] specific implementation plan

[0014] Such as figure 1 As shown, the system structure diagram of multiple inverters running in parallel, in which the synchronization bus and the current sharing bus are two sets of communication lines. A transformer is added to the front stage of each inverter because at high power levels, adding a transformer to the front stage can obtain a relatively high power factor on the grid side. Therefore, the DC input terminals of each inverter are isolated from each other. In order to realize parallel operation, a current sharing inductance L is added. The AC output terminals of each frequency converter are connected in parallel through the current sharing inductor L. The general frequency converter in the system adopts the control.

[0015] Such as figure 2 As shown, is the given frequency reference of the two frequency converters; , is the phase angle of the two frequency converters, obtained from the frequency through the phase angle c...

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Abstract

The invention discloses a distributed control method for parallel operation of frequency converters. The distributed control method comprises three parts including application of a parallel system, synchronous control and current sharing adjustment. The distributed control method proposed by the invention is simple to implement, and can obtain good dynamic and static parallel operation characteristics; in a working range of 20-50 Hz, better current sharing performance can be obtained at different frequencies and during frequency variation; and parallel modules only need to be connected by means of two sets of synchronization and current-sharing signal buses to form the distributed parallel system. Theoretically, any number of frequency converters can be connected in parallel; and the synchronization signals are generated by means of frequency integral signals, and have good anti-interference performance.

Description

Technical field [0001] The invention relates to a frequency converter control method, in particular to a distributed control method for parallel operation of frequency converters. Background technique [0002] In view of the remarkable effect of frequency converters in energy saving and suppression of current impact, frequency converters drive asynchronous motors are widely used in transportation, mining, industrial fans, water pumps and other industrial fields and aerospace systems, and the power levels of frequency converters used are many MW class. From the aspects of device stress, system stability and cost, it is of great application value to study the parallel connection of medium-power frequency conversion units to realize high-power output to form high-power frequency converters. Redundant parallel operation mode is recognized as one of the best solutions to obtain high reliability and large capacity power conversion. At present, many parallel control methods have b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/44H02P27/08
CPCH02M5/44H02P27/08
Inventor 张叡
Owner 张叡
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