A DC Power Flow Control Method Based on mmc Converter Station

A technology of DC power transmission and power flow control, applied in the field of DC power transmission and DC power flow control, can solve the problem of many switching devices, achieve the effect of less switching devices, simple structure, improved control ability and

Active Publication Date: 2016-09-14
无锡中汇汽车电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the circuit structure of these two schemes requires an external power supply to provide power for the adjustable voltage source or absorb its power, and a low-frequency high-voltage isolation transformer is required for voltage isolation, and more switching devices are required.

Method used

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  • A DC Power Flow Control Method Based on mmc Converter Station
  • A DC Power Flow Control Method Based on mmc Converter Station
  • A DC Power Flow Control Method Based on mmc Converter Station

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Embodiment Construction

[0023] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0024] The present invention is applicable to a multi-terminal (three-terminal and more than three-terminal) high-voltage direct current transmission system based on an MMC converter station. The following only takes a three-terminal direct current transmission system, one adjustable voltage source and one fixed voltage source as an example to describe in detail.

[0025] The three-terminal DC power transmission system including the DC power flow control method of the present invention is as follows: Figure 3-1 , Figure 3-2 As shown, MMC3 operates in constant DC voltage mode, MMC1 and MMC2 operate in constant power mode, and takes power from a sub-module capacitor of MMC3 as a fixed voltage source V y , the adjustable voltage source V is connected in series in Line3 through the isolated DC / DC converter x . like figure 2 As shown, the ...

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Abstract

The invention discloses a direct-current transmission current control method based on an MMC converter station. The method comprises the steps that N adjustable voltage sources and N fixed voltage sources are involved; the adjustable voltage sources are connected with a certain power transmission line or some power transmission lines in series, and the fixed voltage sources are capacitors of a certain sub-module or some sub-modules of the MMC converter station; the fixed voltage sources and the adjustable voltage sources are connected through an isolating DC / DC converter; the positive and negative polarity of the output end of the isolating DC / DC converter can be adjusted, and power can flow in two directions. A mode of connecting a bi-directional half-bridge circuit and an H-bridge circuit in series is adopted in the isolating DC / DC converter, currents of a certain power transmission line can be kept to be stabilized at a given value, and therefore the effects of controlling the currents and preventing overcurrents of the power transmission lines can be achieved. According to the direct-current transmission current control method, the circuit structure is simple, the number of switching devices is small, and a low-frequency isolating transformer and an external power source are not needed.

Description

technical field [0001] The invention relates to a DC power flow control method, which belongs to the technical field of power electronics and is mainly used in DC power transmission occasions. Background technique [0002] The multi-terminal direct current transmission system is a direct current transmission system consisting of three or more converter stations connected in series, parallel or hybrid. It can realize multi-source power supply and multi-drop power reception. The operation of the system is more economical and flexible, and it is one of the effective technical means to solve the problems of large-scale renewable energy grid integration, large-capacity long-distance power transmission and shortage of transmission corridors that my country is currently facing. Compared with the traditional current source converter, the voltage source converter (voltage source converter, VSC) reverses the direction of the DC current while the polarity of the current and voltage rema...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02M3/28
CPCY02E60/60
Inventor 陈武吴小刚刘斌吴鸿亮
Owner 无锡中汇汽车电子科技有限公司
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