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MMC-based power electronic transformer system and hierarchical control system architecture thereof

A layered control system and power electronics technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problem that the control system cannot reliably guarantee the synchronous control of the sub-modules of the in-phase bridge arm, and improve the fault redundancy. , Improve control reliability, improve the effect of reliability

Inactive Publication Date: 2020-05-05
PINGGAO GRP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide an MMC-based power electronic transformer system and its layered control system architecture to solve the problem that the existing control system cannot reliably guarantee the synchronous control of the sub-modules in the same phase bridge arm

Method used

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  • MMC-based power electronic transformer system and hierarchical control system architecture thereof
  • MMC-based power electronic transformer system and hierarchical control system architecture thereof
  • MMC-based power electronic transformer system and hierarchical control system architecture thereof

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Embodiment Construction

[0025] Embodiment of power electronic transformer system based on MMC:

[0026] This embodiment provides an MMC-based power electronic transformer system, which includes two parts, namely the circuit topology part and the control part, wherein the circuit topology part (which can be called a power electronic transformer) includes an MMC converter and a DC / DC converter device, such as figure 1 As shown, the AC side of the MMC converter is connected to the three-phase AC. The MMC converter uses a three-phase MMC converter for rectification, and the output is connected to a single medium-high voltage DC bus, and can also be used as a medium-high voltage DC port to connect to a medium-high voltage DC grid. The DC side of the MMC converter is connected to the high-voltage side of the DC / DC converter, and the low-voltage side of the DC / DC converter is the power output terminal of the circuit topology. The DC / DC converter is used to convert high-voltage direct current into low-volta...

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Abstract

The invention relates to an MMC-based power electronic transformer system and a hierarchical control system architecture thereof. A master + slave + valve three-layer control architecture is adopted,each phase of bridge arm in the MMC converter corresponds to one slave controller, so that the control of the phase of bridge arm is specially realized, the synchronous control of the neutron modulesbelonging to the same phase of bridge arm is realized, the synchronization problem of the neutron modules belonging to the same phase of bridge arm is reliably ensured, and the control reliability ofthe system is improved. Moreover, the control layering is reasonable, the master controller does not perform excessive centralized control any more, and a part of control tasks are shared by the slavecontrollers, so that the system fault redundancy and the control reliability are improved. Besides, the control functions of each layer are clearly distributed, so that when each link controlled by the system fails, the fault can be quickly inquired and maintained according to levels, and the reliability of the system is improved. Furthermore, the arranged slave controllers can expand the valve controller, so that the expandability is high, the time period of later development can be shortened, and it is guaranteed that the system can be applied to higher-voltage and high-power occasions.

Description

technical field [0001] The invention belongs to the technical field of power electronic transformers, and in particular relates to an MMC-based power electronic transformer system and a layered control system architecture thereof. Background technique [0002] As a power converter that combines power electronics technology and electromagnetic technology, power electronic transformers usually integrate functions such as electrical isolation, power conversion and reactive power compensation, and provide diverse power for distributed renewable energy and energy storage systems. access port. In addition, compared with traditional power transformers, power electronic transformers have self-protection functions, and realize real-time monitoring and management of the system through digital control. Power electronic transformers greatly meet the current development needs of the power system and play an important role in improving the intelligence level of the power grid. At present...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/088H02M3/315
CPCH02M1/088H02M3/3155H02M7/219H02M1/0012H02M1/0083
Inventor 王留菊张龙程铁汉高树同冯健郑泽东陈丽莎
Owner PINGGAO GRP
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