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Alternating-current drive inverter parallel control system and method

An AC drive and control system technology, applied in the direction of AC power input conversion to DC power output, output power conversion device, electrical components, etc., can solve problems such as large circulation in parallel systems

Active Publication Date: 2019-02-01
WISDRI WUHAN AUTOMATION
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  • Description
  • Claims
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Problems solved by technology

All of the above problems may lead to a large circulating current in the parallel system

Method used

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  • Alternating-current drive inverter parallel control system and method
  • Alternating-current drive inverter parallel control system and method
  • Alternating-current drive inverter parallel control system and method

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Embodiment approach

[0053] Combine below Figure 1 to Figure 6 Introduce the embodiment of the present invention, the specific embodiment is:

[0054] The embodiment of the present invention includes: signal sampling phase control, calculation control phase control, command issuing phase control, signal synchronization processing, and circulation suppression processing.

[0055] The signal sampling phase control is:

[0056] The parallel module control board of the j-th (j∈[1,N]) parallel module unit collects the bus voltage, three-phase current, and power module temperature of the parallel module, and sends them to the communication switch of the parallel module in combination with the serial number information j. connecting board, sending to the communication adapter board of the main control unit, and sending to the control board of the main control unit through the communication adapter board of the main control unit;

[0057] The calculation control phase control is:

[0058] The main con...

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Abstract

The invention provides an alternating-current drive inverter parallel control system and method. Control units in an original stand-alone system are classified into two main control parts: a main control unit and parallel module control units. The main control unit is mainly used for realizing the calculation and control functions of the whole system; and the parallel module control units are usedfor realizing collection and uploading of power module information and driving power unit and basic hardware fault protection. The main control unit and the parallel power module control units carryout power module data uploading and driving control signal issuing by an added parallel communication loop. According to the method provided by the invention, all parallel module control units use carrier synchronization signals to realize carrier wave and control signal synchronization; and all parallel modules adjust transmitting wave comparison values in real time by ring current values to realize ring current suppression. With the method provided by the invention, erection of the modularized inverter parallel system and effective ring current suppression are realized; and the alternating-current drive inverter parallel control method is an alternating-current driving system inverter parallel connection method having the broad application prospects.

Description

technical field [0001] The invention relates to the field of inverter parallel control, in particular to an AC drive inverter parallel control system and method. Background technique [0002] AC inverter drive speed control system has been maturely and widely used in various industrial production fields. In high-power speed control system, with the increase of power, the required current will also increase significantly under the condition of constant voltage. Due to the limitations of materials and processes, the current capacity of high-power switching devices is often difficult to meet the requirements. Inverter parallel connection technology is to connect frequency conversion / inverter modules with small capacity in parallel to share the load power and reduce the current load of the switching tube of a single device. This technology adopts the method of parallel connection of modules. On the one hand, the capacity of the speed control system can be flexibly adjusted by c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/493
CPCH02M7/493
Inventor 金富宽王胜勇卢家斌王傲能
Owner WISDRI WUHAN AUTOMATION
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