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Large-scale parallel system-based distributed communication system and control method thereof

A control method and communication system technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of uneven flow, parallel system circulation, etc., and achieve the effects of easy positioning, improved production efficiency, and easy expansion.

Active Publication Date: 2013-02-20
SHANGHAI JIAODA INTELLECTUAL PORPERTY MANAGEMENT CO LTD +1
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Problems solved by technology

[0004] However, the above-mentioned distributed control unit does not take necessary suppression measures for the circulation and uneven current problems of the parallel system that may be caused by factors such as inconsistent control pulses in the application of high-power parallel systems.

Method used

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  • Large-scale parallel system-based distributed communication system and control method thereof
  • Large-scale parallel system-based distributed communication system and control method thereof
  • Large-scale parallel system-based distributed communication system and control method thereof

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Embodiment 1

[0033] This embodiment is specifically applied to a four-way converter parallel operation system. In this system, the motor is a squirrel-cage asynchronous generator. The converter system is composed of four sets of back-to-back three-phase PWM converter units connected in parallel with a common DC bus. Each unit The rated power is 750kw, and the rated line voltage of the power grid is 690V / 50Hz. The parallel connection of three-phase PWM converter units with a common DC bus means that several independent three-phase converter units share a common DC bus, and the AC bus is connected at the port of the three-phase system. This scheme has higher redundancy and reliability. Each group of back-to-back three-phase PWM converter units includes a machine-side filter L, a machine-side PWM converter, and a DC bus capacitor bank C d , Grid-side PWM converter, grid-side LCL filter. The DC motor is used to drive the squirrel cage asynchronous generator to rotate and make it rotate to ge...

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Abstract

The invention provides a large-scale parallel system-based distributed communication system and a control method of the large-scale parallel system-based distributed communication system. According to the control method, at a time of the triangle-carrier wave peak of a PWM (pulse-width modulation) module, sub-controllers pack collected analog signals and digital signals of a corresponding converter cabinets into a user-defined one-frame data format, and transmit the packet to a main controller, and trigger start signals are generated after all the sub-controllers transmit the collected data to the main controller; the main controller is responsible for the control algorithm and the treatment of fault signals, reads the data transmitted by the sub-controllers after receiving the trigger signals, and transmits control command information to each sub-controller after the computing treatment; the sub-controllers control the corresponding PWM converter cabinets after receiving the control information. Namely, one transmitting and receiving process can be completed by the distributed communication control. By the system and the control method, the modularization and the parallel control of the wind power converter can be easily realized, the faults of the system can be easily positioned, and the circulation flow and the uneven flow of the parallel system can be effectively restrained.

Description

technical field [0001] The invention relates to a wind power PWM converter, in particular to a distributed communication system based on a large-scale parallel system and a control method thereof. Background technique [0002] Converter is one of the core technologies of wind power generation. With the continuous increase of wind power unit capacity, how to realize high-power converter under low voltage (690V) has become an urgent problem to be solved. The parallel connection technology of converters has the advantages of effectively increasing the power level, increasing system reliability and efficiency, reducing cost and voltage and current ripple, and is easy to modularize design and system configuration, and has more flexibility. It is useful in high-power occasions. Wide application prospects. However, with the increase of parallel branches, the acquisition channels of analog signals and the drive signals of power switch tubes will increase greatly, which puts forward...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 韩刚张建文
Owner SHANGHAI JIAODA INTELLECTUAL PORPERTY MANAGEMENT CO LTD
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