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A DC distribution center based seamless switching method of a virtual synchronous generator

A virtual synchronization and seamless switching technology, applied in the direction of AC network circuits, circuit devices, power transmission AC networks, etc., can solve the problems of lack of elasticity, no mutual power support, and unbalanced load on the distribution network. To achieve the effect of smooth adjustment process, stable voltage and frequency, and seamless switching

Active Publication Date: 2019-01-11
GUIZHOU POWER GRID CO LTD
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Problems solved by technology

[0002] The traditional distribution network is a rigid system. The access and withdrawal of power sources and the transmission of electric energy lack flexibility, resulting in the lack of dynamic flexibility and flexible adjustment characteristics of the distribution network. There are unbalanced loads in various parts of the distribution network and mutual interaction. There is no ability to support each other in power, and it is difficult to meet the requirements of the power distribution system for power quality

Method used

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  • A DC distribution center based seamless switching method of a virtual synchronous generator
  • A DC distribution center based seamless switching method of a virtual synchronous generator
  • A DC distribution center based seamless switching method of a virtual synchronous generator

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Embodiment Construction

[0020] A method for seamless switching of virtual synchronous generators based on DC power distribution centers, which is based on the technology of virtual synchronous generators of DC power distribution seam switching.

[0021] The first 10kV AC line is connected to the 1# MMC AC side with bidirectional power flow function through 1# isolation transformer; the second 10kV AC line is connected to 2# MMC AC side with bidirectional power flow function through 2# isolation transformer; By analogy, the Nth 10kV AC line is connected to the AC side of the N#MMC with bidirectional power flow function through the N# isolation transformer; the DC side of the N MMCs are connected through the DC bus to form a flexible interconnected closed-loop operation structure of the distribution network . N MMCs are all equipped with virtual synchronous generator additional control and pre-synchronization links on the basis of conventional control.

[0022] When the operation status of the i-th 1...

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Abstract

The invention discloses a DC distribution center based seamless switching method of a virtual synchronous generator. Each 10kV AC line is connected to the AC side of the MMC with bi-directional powerflow function through an isolation transformer. The DC side of each MMC is connected by a DC bus. The virtual synchronous generator technology is used to realize the seamless switching between different operation modes of flexible interconnected distribution network. The multi-terminal flexible interconnected distribution network AC system based on the DC distribution center of the invention can provide mutual support of power, and the voltage and the frequency of the fault AC bus bar can be ensured to be stable through the interaction of the active power and the reactive power under the faultcondition, and has the structural characteristics of adopting the virtual synchronous generator technology naturally; Virtual synchronous generator (VSG) control is introduced into flexible interconnected distribution network to realize seamless switching of parallel / offline operation mode by using its primary frequency modulation, voltage regulation and damping characteristics.

Description

technical field [0001] The invention belongs to the field of power electronic device control, in particular to a method for seamless switching of a virtual synchronous generator based on a DC power distribution center. Background technique [0002] The traditional distribution network is a rigid system. The access and withdrawal of power sources and the transmission of electric energy lack flexibility, resulting in the lack of dynamic flexibility and flexible adjustment characteristics of the distribution network. There are unbalanced loads in various parts of the distribution network and mutual interaction. There is no ability to support each other in power, and it is difficult to meet the requirements of the power distribution system for power quality. [0003] The AC-DC flexible interconnection distribution network adopts the closed-loop connection and closed-loop operation mode, which can effectively solve the problems of lack of flexibility in the connection and exit of...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/24H02J3/36H02J2203/20Y02E60/60
Inventor 谈竹奎徐玉韬谢百明吕黔苏肖永齐雪雯班国邦徐长宝毛时杰袁旭峰高吉普邵振陈明洋黄伟煌刘斌马春雷丁健
Owner GUIZHOU POWER GRID CO LTD
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