Topological structure and control method of improved SEN transformer

A control method and transformer technology, applied in the direction of AC network voltage adjustment, etc., to achieve continuous voltage adjustment, solve switching oscillation problems, and improve compensation accuracy

Active Publication Date: 2014-04-02
WUHAN UNIV
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Problems solved by technology

[0007] Aiming at the shortcomings of existing SEN transformers, the present invention provides a topology structure of an improved SEN transformer that can realize continuous voltage adjustment, improve compensation accuracy, avoid switching oscillation problems, and regulate power flow distribution of transmission lines. and control method

Method used

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  • Topological structure and control method of improved SEN transformer
  • Topological structure and control method of improved SEN transformer
  • Topological structure and control method of improved SEN transformer

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Embodiment Construction

[0034] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0035] See figure 1 , the improved SEN transformer of the present invention is composed of a large-capacity ST and a small-capacity UPFC in series, and the parallel converter VSC1 of the UPFC is connected in parallel to the equivalent head-end voltage of the transmission system of the distribution network place. The head end and end power supply voltages of the distribution network transmission system are The internal impedance of the head end and the end power supply is X s 、X r ; The equivalent head-end voltage after compensation of the improved SEN transformer is The equivalent terminal voltage is The impedance of the transmission line is equivalent to X L , ignoring the line resistance.

[0036] ST and UPFC work together to adjust the power flow of the transmission system of the distribution network. The parallel converter VSC1 ...

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Abstract

The invention discloses a topological structure and a control method of an improved SEN transformer. The topological structure of the improved SEN transformer consists of an SEN transformer and a unified power flow controller connected in series, wherein the SEN transformer is connected with an electric transmission line in series; a parallel connection variator VSC1 of the unified power flow controller is connected with the equivalent head end of a power distribution network transmission system in parallel; a parallel connection variator VSC2 of the unified power flow controller is connected with the equivalent tail end of the power distribution network transmission system in parallel. 360-degree discrete adjustable series connection voltage is realized through controlling a common on-load tap changer by the SEN transformer; 360-degree continuous adjustable series connection voltage is realized through controlling an electronic power switch by the unified power flow controller. The topological structure and the control method of the improved SEN transformer have the advantages that the voltage is continuously adjustable, the compensation accuracy is high, the switching vibration problem is avoided, and the like, and can be used for regulating and controlling the electric transmission line power flow distribution.

Description

technical field [0001] The invention belongs to the technical field of flexible alternating current transmission systems, and in particular relates to a topology structure and a control method of an improved SEN transformer. Background technique [0002] With the intensification of global economic integration, the power industry is facing more and more challenges from all walks of life. The increasing demand for industrial electricity and the increasing pressure on the environment and energy are driving the power system to develop in a stronger, more efficient and cleaner direction. However, some large power outages in recent years show that the transmission efficiency of the power system and the safe and stable operation of the power system are particularly important issues that need to be solved. At present, the production, transmission and distribution of electric energy in the world are still dominated by centralized power generation, long-distance power transmission an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12
Inventor 袁佳歆陈立费雯丽曾雯珺周攀赵震陈柏超田翠华
Owner WUHAN UNIV
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