CN201904615U - Fault current limiting device based on thyristor controlled series compensation - Google Patents
Fault current limiting device based on thyristor controlled series compensation Download PDFInfo
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- CN201904615U CN201904615U CN2010206880144U CN201020688014U CN201904615U CN 201904615 U CN201904615 U CN 201904615U CN 2010206880144 U CN2010206880144 U CN 2010206880144U CN 201020688014 U CN201020688014 U CN 201020688014U CN 201904615 U CN201904615 U CN 201904615U
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Abstract
The utility model provides a fault current limiting device based on a thyristor controlled series compensation, and belongs to the technical field of flexible AC transmission equipment. The fault current limiting device comprises a metal oxide voltage limiter, a capacitor, parallel inductors, anti-parallel thyristors, a solid-state switch and series current limiting inductors connected in parallel with the switch. The solid-state switch is used for switching between a series compensation mode and a current limiting mode; the device normally runs at a series compensation mode and has a structure completely identical with a thyristor controlled series compensation structure, thereby providing inductive or capacitive reactive power for a line. The fault current limiting device has the advantages that when going wrong, the device can rapidly switch to the current limiting mode to run, thereby effectively limiting short circuit current; and the modification on the original thyristor controlled series compensation device is small, so that the implementation is easy.
Description
Technical field
The utility model relates to a kind of electric power system fault current-limiting apparatus, belongs to the flexible AC transmission equipment technical field.
Background technology
Along with the fast development of industry and improving constantly of people's living standard, party in request grows to even greater heights for the cry of the high-quality quality of power supply.Particularly in recent years, the development of the technological leapfrogging formula of power electronic device, lot of F ACTS device is applied in the electrical network, makes the controllability of electrical network and fail safe greatly improve.Along with the reduction of FACTS apparatus cost, in the near future, will be more competitive than conventional power transmission and distribution scheme.At present, the Power System Shortcuts current values improves constantly, and short trouble is huge to the power system security influence, and higher short circuit current level has become the key factor of restriction operation of power networks and development, and the development of Fault Current Limiting Device becomes the important subject of power industry.
Controllable series compensator (TCSC) can be regulated effects such as circuit trend, inhibition system oscillation, the raising stability of a system as a kind of important FACTS transmission facility, is applicable to the high pressure long distance power transmission.Because adopt power electronic device, it is swift in motion, control easyly, wide application prospect is arranged in electric power system.Because the controlled series compensation device can be controlled its equiva lent impedance according to system's needs, therefore when short trouble took place, control made it be the perception operation, also can reduce fault current levels.This multi-functional, the device of multi objective control will become the development trend of FACTS.
Summary of the invention
Technical problem to be solved of the present utility model provides a kind of Fault Current Limiting Device based on controlled series compensation, moves one-machine-multi-function according to system's needs as series compensation device and Fault Current Limiting Device.
The utility model is for realizing that above-mentioned utility model purpose adopts following technical scheme:
A kind of Fault Current Limiting Device based on controlled series compensation comprises voltage limiter, electric capacity, first inductance, current-limiting inductance, thyristor circuit and solid-state control switch;
One end of wherein said voltage limiter is connected with an end of electric capacity, an end of first inductance respectively;
The other end of described voltage limiter is connected with an end of an end of pressure limiting inductance, solid-state control switch respectively;
The other end of described electric capacity is connected with the other end of the other end of pressure limiting inductance, solid-state control switch, an end of thyristor circuit respectively;
The other end of described first inductance is connected with the other end of thyristor circuit.
Further, the Fault Current Limiting Device based on controlled series compensation of the present utility model, thyristor circuit is made up of two anti-parallel thyristors.
Further, the Fault Current Limiting Device based on controlled series compensation of the present utility model, voltage limiter is a metal oxide pressure-limiting device.The utility model adopts technique scheme to have following beneficial effect:
The utility model relies on the action of solid-state switch that the mode of operation of device is switched, and when solid-state switch was opened, device ran on current-limit mode; When solid-state switch was closed, device ran on string complementary modulus formula, and mode switch is reliable rapidly.
When the utility model runs on string complementary modulus formula, the solid-state switch closure, apparatus structure and just the same based on the series compensation device of thyristor is convenient to theory analysis, also be convenient to put upgrading, calculate the thyristor trigger angle according to the requirement of compensativity at the basic enterprising luggage of TCSC.
When the utility model runs on current-limit mode, can choose suitable current limliting coefficient according to original cut-off current of system and the cut-off current of desiring to reach, calculate the order impedance, draw the relative trigger angle by tabling look-up, finish Current limited Control; By the opening of solid-state switch, seal in current-limiting inductance simultaneously, thereby increase the external equivalent inductive reactance of device, when fault, at utmost reduce short circuit current level.
When being short-circuited fault, the utility model drops into the series connection current-limiting inductance by the switching of solid-state switch, not only relies on controlled series compensation that emotional resistance is provided, and the current limliting level is significantly improved.
Description of drawings:
Fig. 1 is an electrical structure diagram of the present utility model.
Fig. 2 is the equivalent schematic of the utility model wiring in electric power system.
Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
With reference to Fig. 1, comprise metal oxide pressure-limiting device MOV, capacitor C, shunt inductance based on the Fault Current Limiting Device of controlled series compensation
, the series connection current-limiting inductance
, two anti-parallel thyristors and solid-state control switch K form, and wherein, metal oxide pressure-limiting device MOV is used for the device overvoltage protection, and solid-state switch K is used for device and switches between string complementary modulus formula and current-limit mode.The utility model relies on the action of solid-state switch that the mode of operation of device is switched, and when solid-state switch was opened, device ran on current-limit mode; When solid-state switch was closed, device ran on string complementary modulus formula, and mode switch is reliable rapidly.Under the normal condition, device runs on string complementary modulus formula, improves the circuit transmission power, and during fault, device switches to the current-limit mode operation immediately, reduces the line short circuit current level.
With reference to Fig. 2, device is connected in the transmission system, and by the control of thyristor trigger angle, device externally equivalence is perception or capacitive, generally speaking, in order to improve the ultra-high-tension power transmission line transmission power, installs the external impedance that presents and regulates in the capacitive scope.If in the extra high voltage network, terminal voltage is higher, also device can be installed in line end, will install the external impedance that presents simultaneously and regulate in perceptual scope.This device can be mended device or fault current limiter use as string according to system's needs.Device normally runs on string complementary modulus formula, according to detected line current, judging has fault-free to take place, when detecting system power when being worth greater than certain, solid-state switch K disconnects immediately, seals in current-limiting inductance, simultaneously by control anti-parallel thyristor trigger angle, make string mend device and approach pure perception operation, thereby level can be born by the short circuit current system of being reduced to.Embody the plant failure current limiting capacity with the current limliting coefficient, and, define the current limliting coefficient as the standard that component parameters is chosen:
(1) in the formula,
Be the external equivalent reactance of device,
Be line impedance,
With
Be respectively string and mend input front and back system short-circuit levels of current, as can be seen,
By regulating the thyristor trigger angle
, have
Then FCL order impedance can be represented with following formula,
As seen, the current limliting coefficient is chosen big more, and the current limitation effect of FCL is obvious more.Choose suitable current limliting coefficient according to the system short-circuit levels of current of desiring to reach, calculate the order impedance after, tabling look-up draws trigger angle, thus the Current limited Control of finishing device.
Claims (3)
1. the Fault Current Limiting Device based on controlled series compensation is characterized in that: comprise voltage limiter, electric capacity, first inductance, current-limiting inductance, thyristor circuit and solid-state control switch;
One end of wherein said voltage limiter is connected with an end of electric capacity, an end of first inductance respectively;
The other end of described voltage limiter is connected with an end of an end of pressure limiting inductance, solid-state control switch respectively;
The other end of described electric capacity is connected with the other end of the other end of pressure limiting inductance, solid-state control switch, an end of thyristor circuit respectively;
The other end of described first inductance is connected with the other end of thyristor circuit.
2. the Fault Current Limiting Device based on controlled series compensation according to claim 1 is characterized in that: described thyristor circuit is made up of two anti-parallel thyristors.
3. the Fault Current Limiting Device based on controlled series compensation according to claim 1 is characterized in that: described voltage limiter is a metal oxide pressure-limiting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206880144U CN201904615U (en) | 2010-12-30 | 2010-12-30 | Fault current limiting device based on thyristor controlled series compensation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206880144U CN201904615U (en) | 2010-12-30 | 2010-12-30 | Fault current limiting device based on thyristor controlled series compensation |
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| Publication Number | Publication Date |
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| CN201904615U true CN201904615U (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206880144U Expired - Fee Related CN201904615U (en) | 2010-12-30 | 2010-12-30 | Fault current limiting device based on thyristor controlled series compensation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035196A (en) * | 2010-12-30 | 2011-04-27 | 东南大学 | Thyristor controlled series compensator-based fault current limiting device |
| CN105790227A (en) * | 2016-04-20 | 2016-07-20 | 安徽伊格瑞德电气设备有限公司 | Series compensation zero-loss current limiting integrated system |
| CN109586260A (en) * | 2018-10-30 | 2019-04-05 | 华北电力大学 | A kind of resistance sense type capacitor commutation blended learning and its control method |
-
2010
- 2010-12-30 CN CN2010206880144U patent/CN201904615U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035196A (en) * | 2010-12-30 | 2011-04-27 | 东南大学 | Thyristor controlled series compensator-based fault current limiting device |
| CN105790227A (en) * | 2016-04-20 | 2016-07-20 | 安徽伊格瑞德电气设备有限公司 | Series compensation zero-loss current limiting integrated system |
| CN109586260A (en) * | 2018-10-30 | 2019-04-05 | 华北电力大学 | A kind of resistance sense type capacitor commutation blended learning and its control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110720 Termination date: 20121230 |