Self-shunt excitation system based on parallel multiple current source converters

An excitation system and current-type technology, applied in the direction of controlling the generator through the change of the magnetic field, reducing/preventing power oscillation, etc., can solve the problems of insufficient excitation capacity and expansion of system accidents, and achieve the effect of building pressure and improving reliability

Active Publication Date: 2011-11-30
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 system based on parallel multiple current source converters
  • Self-shunt excitation system based on parallel multiple current source converters
  • Self-shunt excitation system based on parallel multiple current source converters

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Embodiment Construction

[0014] figure 1 Shown is the structure schematic diagram of the present invention, and this system comprises excitation transformer 1 (as figure 2 shown), M current-type converters 2, excitation coils 4 (such as Figure 4 shown); the number of primary windings of the excitation transformer 1 is 1, the number of secondary windings is M, and M≥1; N current-type three-phase fully-controlled bridge circuits 3 based on fully-controlled switching devices (such as image 3 shown) are connected in parallel to form a current-source converter 2, N≥1; the AC ports c of the M current-source converters 2 are connected to the M secondary windings b of the excitation transformer 1 in one-to-one correspondence, and the DC ports They are connected in parallel to form a DC port d, which is connected to the input port e of the excitation coil 4 . The full-control switching device can be an insulated gate bipolar power transistor IGBT, an integrated gate commutation thyristor IGCT, and a turn-...

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Abstract

The invention discloses a self-shunt excitation control system based on parallel multiple current-type converters, including an excitation transformer, an excitation coil and M current-type converters, M≥1; the number of primary windings of the excitation transformer is 1 , the number of secondary windings is M; the AC sides of the M current-source converter groups are respectively connected to the M secondary windings of the excitation transformer in one-to-one correspondence, and the DC sides are connected in parallel to form a DC port connected to the input end of the excitation coil; The type converter is composed of at least one current-type three-phase fully-controlled bridge circuit connected in parallel based on fully-controlled switching devices. The invention can not only provide positive damping for the system through DC excitation, but also adjust the terminal voltage of the synchronous generator to provide positive damping for the system, thereby more effectively suppressing the low-frequency / ultra-low-frequency oscillation of the power system and improving the operation stability of the 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 based on a current-type converter. Background technique [0002] Modern power systems require that the excitation system of synchronous generators can suppress low-frequency / ultra-low-frequency oscillations of 0.1Hz to 3Hz. However, the excitation system of conventional silicon controlled rectifiers only enhances damping by controlling DC excitation, and it is difficult to achieve the purpose of suppressing low-frequency oscillations in a wide range from low-end 0.1Hz to high-end 3Hz. When low-frequency / ultra-low-frequency oscillation occurs in the power grid, the terminal voltage of the synchronous generator will also oscillate with a large low-frequency / ultra-low frequency, so that the terminal voltage may continue to be at a low level for a long time (several seconds). During oscillation, if a short-circuit fault occurs in the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02P9/14
Inventor 毛承雄陆继明王丹娄慧波何丽娜张坤杨嘉伟张锐
Owner HUAZHONG UNIV OF SCI & TECH
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