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Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors

A series structure and converter technology, applied in the direction of controlling generators through magnetic field changes, can solve the problems of system accident expansion and insufficient excitation capacity, and achieve the effect of simple control method, fast control speed, and small AC and DC harmonics.

Active Publication Date: 2014-08-27
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Once the excitation capacity is insufficient, it will inevitably lead to the expansion of system accidents

Method used

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  • Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors

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Embodiment Construction

[0012] The present invention is described in more detail below by means of examples, but the following examples are only illustrative, and the protection scope of the present invention is not limited by these examples.

[0013] Such as figure 1 As shown, the system provided by the present invention includes an excitation transformer 1, a current-mode converter 2 and an excitation coil 4; the current-mode converter 2 is connected in series by three current-mode single-phase fully-controlled bridge circuits 3 based on fully-controlled switching devices The circuit 3 is composed of a single-phase full-bridge rectifier circuit and its DC side parallel switch circuit; the AC side c of the current source converter 2 is connected with the secondary winding b of the excitation transformer 1 in one-to-one correspondence, and the DC side d is connected to the secondary winding b of the excitation transformer 1. The input terminal e of the excitation coil is connected. The output end of...

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Abstract

The invention provides a self shunt excitation control system of a series structure of three current-mode single-phase bridge-type convertors. The system comprises an exciting transformer, a current-mode converter and an excitation coil, wherein the current-mode converter is formed by series connection of three current-mode single-phase bridge circuits based on a fully controlled switching device; and the alternating current side of the current-mode converter is respectively connected with a secondary winding of the exciting transformer in the manner of one-to-one correspondence, and the direct current side of the current-mode converter is connected with the input end of the excitation coil. The self shunt excitation control system can provide positive damping for a system through direct current excitation, and can also provide positive damping for the system by regulating the terminal voltage of a synchronous generator, thereby more effectively restraining low frequency / ultra low frequency oscillation of the electric power system, and improving the operational stability of the electric power system.

Description

technical field [0001] The invention relates to the field of excitation control systems, in particular to a self-shunt excitation control system with a series structure of current-type three-phase bridge converters. Background technique [0002] The safe and stable operation of the power system is closely related to the national economy. Among them, excitation control has become one of the important means to improve the stable operation of the power system. An excellent excitation system can effectively ensure the voltage quality and improve the stability of the power system operation. With the development of grid capacity and scale, the requirements for the reliability and dynamic performance of excitation control are getting higher and higher. The self-shunt excitation system of synchronous generator has become the main method of excitation control at home and abroad because of its unique advantages. [0003] Modern power systems require that the excitation system of sync...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/30
Inventor 王丹杨嘉伟何金平张坤周彬倩陆继明毛承雄
Owner HUAZHONG UNIV OF SCI & TECH
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