Grid connection method of MMC-type light direct-current power transmission system

A power transmission system and light direct current technology, applied in the field of power electronics, can solve problems such as large inrush current, switching failure, and difficult switching between voltage control and current control, and achieve the effects of avoiding overcurrent, reliable power supply, and short pre-synchronization time

Active Publication Date: 2014-05-14
HUNAN UNIV
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Problems solved by technology

[0003] 1. Operation mode switching control adopts dual-mode control technology. PQ current control method is adopted for grid-connected operation, and V/f control method is adopted for island operation. The dual-mode control technology meets the needs of micro-grid operation, but there is a gap between voltage control and current control. Switching is difficult, there is a risk of switching failure, and it is neces...

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  • Grid connection method of MMC-type light direct-current power transmission system
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  • Grid connection method of MMC-type light direct-current power transmission system

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[0021] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are only used to illustrate the present invention, but can not be used to limit the scope of the present invention.

[0022] see figure 1 with figure 2 , respectively show the structural block diagram of the MMC type light direct current transmission system and the operational control algorithm block diagram in the operation mode control method thereof according to an embodiment of the present invention. The MMC light DC transmission system mainly includes MMC, LC filter and circuit breaker. The LC filter is connected in parallel between the MMC and the grid, and the circuit breaker is used to realize the grid connection and disconnection of the MMC. The control link of the system mainly includes a virtual synchronous control unit and a capacitive voltage equalization and classification control unit. Real-t...

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Abstract

The invention discloses a grid connection method of an MMC-type light direct-current power transmission system. A virtual synchronization control method is combined with an MMC so that switching of operation modes of the MMC-type light direct-current power transmission system can be carried out, a special synchronization control circuit is needless, the system can be automatically synchronized with a power grid before grid connection, pre-synchronization time is short, the system can accurately follow frequency of the power grid after grid connection, and friendly grid connection is achieved.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a method for grid connection of an MMC (modular multilevel converter) type light direct current transmission system (HVDC-Light). Background technique [0002] In recent years, with the aggravation of energy and environmental problems, the penetration rate of renewable energy such as solar energy and wind energy in the power system has been increasing. With the improvement of distributed power capacity and voltage level, especially the development of offshore wind power, light direct current transmission has emerged as the times require. As the main circuit of the light DC transmission system, MMC can effectively reduce the harmonic content of the output voltage and realize high-voltage and high-power operation. Distributed power generation has the characteristics of being dispersed and close to the load. If it can realize smooth switching between grid-connected and island-conne...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 帅智康彭斌沈征尹新周猛杨浩莫尚林
Owner HUNAN UNIV
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