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Multi-machine parallel control topological structure based on high-voltage inverters

A technology of high-voltage frequency converter and topology structure, which is applied in the direction of AC motor control, control system, high-efficiency power electronic conversion, etc., to achieve the effect of saving design cost, responding in a timely manner, and improving anti-interference ability

Active Publication Date: 2014-11-26
WOLONG ELECTRIC GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time solve the soft switching problem of frequency conversion control motor

Method used

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  • Multi-machine parallel control topological structure based on high-voltage inverters
  • Multi-machine parallel control topological structure based on high-voltage inverters
  • Multi-machine parallel control topological structure based on high-voltage inverters

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Embodiment Construction

[0023] The specific embodiment of the present invention is further described below in conjunction with accompanying drawing:

[0024] Such as figure 1 As shown, a multi-machine parallel control topology based on high-voltage inverters, including two cascaded high-voltage inverters, a central controller, a set of PLC control system, 1# inverter on the first section of the grid and the The 2# inverter on the 2nd section is connected in parallel with the reactor that suppresses the base current of the ring wave in series at the output end. Each high-voltage inverter control system communicates with the central controller through 10M optical fiber, and communicates with the PLC control system. The control system of a single high-voltage inverter accurately collects the state of each inverter and transmits it to the central controller. The central controller collects the state of the parallel system, coordinates the parallel circuit and each actuator, and realizes the current equa...

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Abstract

The invention relates to a multi-machine parallel control topological structure based on high-voltage inverters. The cascade high-voltage inverters are connected in parallel, communicated with a PLC externally and communicated with each other through optical fibers. Coordination control over the inverters is performed through the same central controller. By means of multi-machine parallel connection, overall capacity expansion of the driving inverters is achieved, and the purpose that small-capacity power devices are connected in parallel to control a large motor is achieved. By means of the multi-machine parallel control topological structure, soft handover of the motor controlled by the inverters is achieved, the process of galloping starting of spare inverters required when shutting down of the inverters happens is avoided, therefore, the purpose of one inverter with a backup is achieved truly, control over the large-capacity motor is achieved by means of parallel connection of more than two inverters through the IGBT inverter bridge cascade topological structure, the multi-machine parallel control topological structure treads into the field where only an IEGT can tread in the past, and the problem of heat dissipation caused by operation of high-power devices in the past is avoided.

Description

technical field [0001] The invention relates to a parallel control technology based on an uncontrollable rectification multi-stage series frequency converter, in particular to a multi-machine parallel control topology structure based on a high-voltage frequency converter. Background technique [0002] IGBT is currently the most widely used valve element in the high-voltage inverter industry. By controlling the firing angle of IGBT, the impedance can be continuously adjusted, which can enhance the power transmission capacity of the system, improve system stability, damp power oscillation and suppress subsynchronous oscillation. Cascaded frequency conversion is a generally applicable topology for high-voltage frequency converters, which can produce a perfect sinusoidal output voltage waveform with a harmonic content of no more than 4%. [0003] The existing cascaded high-voltage frequency conversion control motor system, on the one hand, has the problem that when the high-volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/092H02P27/08
CPCY02B70/10
Inventor 伍鹏曹鹏李太峰刘洋于吉帅刘相鹤孙锡星郝爽张丹
Owner WOLONG ELECTRIC GRP CO LTD
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