A unified DC power flow controller for DC power systems
A DC power flow and power system technology, applied in power transmission and AC networks, etc., can solve the problems of simultaneous active control and limited application occasions, and achieve the effect of improving the dimension of power flow control, enriching application scenarios, and having scalability.
Active Publication Date: 2021-04-02
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
The inter-line DC power flow controllers proposed in Document 1 and Document 2 can only realize the active increase / decrease of the power flow of one line, and the passive decrease / increase of the power flow of the other line, and cannot actively control the power flow of two lines at the same time, which belongs to degeneration The single-increase and single-decrease mode is limited in application occasions, so a new DC power flow controller is needed to ensure the diversity of line power flow control in the DC transmission system
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[0030] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to protection domain of the present invention.
[0031] The composite DC power flow inherits the functions of the series adjustable voltage source and the line-to-line DC power flow controller. At the same time, it can also realize three power flow regulation modes for two lines. It has perfect functions and is called a unified DC power flow controller.
[0032] Such as figure 1 As shown, the unified DC power flow controller of the present invention for DC power system includes a first bypass switch S 1 , the second bypass switch S 2 , the first ...
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The invention provides a unified DC power flow controller for a DC electric power system. The controller comprises a first bypass switch, wherein an eighth diode is connected with a collector electrode of a second IGBT tube and is connected in parallel with a first capacitor, the first capacitor is connected in parallel with the first bypass switch, a second capacitor is connected in parallel witha second bypass switch and a ninth diode, the ninth diode is connected with an emitter electrode of a third diode, and a tenth diode is connected with a collector electrode of a fourth IGBT tube. Thecontroller is advantaged in that power flow of two lines can be actively controlled, the controller is suitable for occasions of multiple power flow control targets, and the power flow control freedom degree of a multi-end DC power transmission system is enhanced.
Description
technical field [0001] The present invention relates to a controller, in particular to a unified DC power flow controller (Unified DC Power Flow Controller, UDCPFC for short) oriented to a DC power system. Background technique [0002] With its remarkable technical advantages, flexible direct current transmission is playing an increasingly important role in large-capacity long-distance power transmission and large-scale renewable energy power generation grid integration. For complex multi-terminal DC transmission systems, the number of DC lines is often greater than the number of converter stations, and there is a lack of active power flow distribution and coordination control capabilities on any line. Scholars proposed to introduce a DC power flow controller into the DC power grid to increase the control dimension of the DC power flow and achieve the goal of controlling the power flow of each line. [0003] The power flow factors in the DC grid are only line resistance and...
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 朱淼徐莉婷钟旭蔡旭
Owner SHANGHAI JIAO TONG UNIV