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Master-slave inverter parallel system switching control method and device

A control method and system switching technology, applied in the direction of output power conversion device, circuit device, AC power input conversion to DC power output, etc., can solve the problem that the reliability of parallel system operation is difficult to guarantee, and the lack of inverter output voltage self-test to achieve smooth switching and transition, avoid shocks, and improve operational reliability

Active Publication Date: 2021-06-08
HEFEI TONGZHI ELECTRICAL CONTROL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the existing inverter parallel connection technology lacks effective inverter output voltage self-test means, which makes it difficult to guarantee the reliability of the parallel system operation

Method used

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  • Master-slave inverter parallel system switching control method and device
  • Master-slave inverter parallel system switching control method and device
  • Master-slave inverter parallel system switching control method and device

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Embodiment 1

[0081] A master-slave inverter parallel system switching control method, such as figure 2 As shown, it is a schematic structural diagram of the master-slave inverter parallel system provided by the present invention. The master-slave inverter parallel system includes multiple inverters, and each inverter is correspondingly equipped with an AC output switch and a control board. The output ends of multiple inverters are respectively connected to the same common bus on the AC side through the AC output switch, and the control boards of each inverter are connected in turn through the sending end and the receiving end to form a ring; image 3 As shown, a control flow chart of a master-slave inverter parallel system switching control method provided by the present invention is given, and the switching control method includes:

[0082] Step 1: In the master-slave inverter parallel system, each inverter is started in voltage mode; the control board of the inverter works in the signal...

Embodiment 2

[0107] Corresponding to Embodiment 1 of the present invention, Embodiment 2 of the present invention also provides a master-slave inverter parallel system switching control device. The master-slave inverter parallel system includes multiple inverters, and each inverter The inverter is equipped with an AC output switch and a control board. The output terminals of multiple inverters are respectively connected to the same AC side common bus through the AC output switch. The switching control device includes: an output voltage harmonic content detection module, which is used to detect the output voltage harmonic content of all inverters before the parallel system is started, and control the inverter with abnormal output voltage to automatically exit the parallel system .

[0108] Specifically, the output voltage harmonic content detection module is also used for:

[0109] Step 1: In the master-slave inverter parallel system, each inverter is started in voltage mode; the control b...

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Abstract

The invention discloses a switching control method and device for a master-slave inverter parallel system, the master-slave inverter parallel system comprises a plurality of inverters, each inverter is correspondingly provided with an AC output switch and a control panel, the output ends of the plurality of inverters are respectively connected to the same AC side common bus through the AC output switches, and the control panels of the inverters are sequentially connected into a ring through transmitting ends and receiving ends; the switching control method comprises the following steps: carrying out output voltage harmonic content detection on all inverters before the parallel system is started, and controlling the inverters with abnormal output voltage to automatically exit from the parallel system; according to the number of the inverter with normal output voltage, finishing the setting of a master machine and a slave machine; under the condition that the host computer breaks down, notifying the adjacent slave computer through level signal overturning of the control panel of the host computer so that the slave computer is automatically switched to the host computer; the device and the method have the advantages that an effective inverter output voltage self-checking means is provided, and the operation reliability of the parallel system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of inverter parallel current sharing control, and more specifically relates to a master-slave inverter parallel system switching control method and device. Background technique [0002] With the continuous increase of various electrical equipment, the requirements for the capacity and reliability of the power supply system are getting higher and higher. The AC power supply system of a single inverter can no longer meet the requirements, and the parallel technology of inverters is required. . In the inverter parallel system, there may be circulation problems among the inverters, which will affect the stability of the system, especially when the parameters of the inverters such as input voltage, filter and line impedance, and the carrier signal of the controller exist. When there is a difference, the problems of parallel uneven current and common mode voltage will be more prominent. [0003] At present, para...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02J9/06
CPCH02M7/5387H02J9/062
Inventor 王成悦汪玲吴玉良张海明赵艺雷
Owner HEFEI TONGZHI ELECTRICAL CONTROL TECH
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