CN2899236Y - Unified current controller with short-circuit current-limiting function - Google Patents
Unified current controller with short-circuit current-limiting function Download PDFInfo
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- CN2899236Y CN2899236Y CN200620069650.2U CN200620069650U CN2899236Y CN 2899236 Y CN2899236 Y CN 2899236Y CN 200620069650 U CN200620069650 U CN 200620069650U CN 2899236 Y CN2899236 Y CN 2899236Y
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Abstract
The utility model discloses an unified current controller with short-circuit current-limiting function, which comprises a series coupled transformer 1, a voltage source reverser 2, an energy storage capacitor 3, a voltage source reverser 4, an output filter 5, an output filter 6, a signal inspecting circuit 7, a control circuit 8, a driven circuit 9, a parallel coupled transformer 10, and which is characterized in that the series coupled transformer 1 is a changeable resistance transformer with the current magnetic saturation. The utility model can realize current control under the normal conditions, and can limit the increase of the short-circuit current automatically and effectively under the occurrence of short circuit fault, therefore saving a set of short-circuit current-limiting device, saving the investment, improving the reliability of the unified current controller, furthermore improving the UPFC function of the unified current controller and enhancing the coordination of functions.
Description
Technical field
The utility model is a kind of alternating voltage electric power system that is applied to, under the normal situation of system, system is carried out controls such as voltage-regulation, series compensation and phase shift, under the situation that has short trouble to take place, to the device that short-circuit current and climbing thereof limit, belong to the technical field that exchanges the flexible transmission technology.Be the flexible AC transmission equipment of a class specifically based on variable impedance transformer and THE UPFC---have the THE UPFC of short circuit current limitation function.
Background technology
The increase day by day of electric power system scale, short circuit current numerical value also increase thereupon, and short trouble is also increasing to the harm of system.Based on the solid-state short-circuit fault current limiter of the bridge-type of power electronic technology after detecting short trouble and taking place; impedance parameter by quick change faulty line; short circuit current is limited in the level of permission,, has become one of key element of flexible AC transmitting system with the protection power equipment.Flow restricter is a kind of large-capacity power device, volume, weight, cost are bigger, but reason because of its function, special flow restricter only works in the short time at the utmost point that short trouble takes place, under the normal condition that accounts for most running times, flow restricter is in " preparation " state, and utilization rate of equipment and installations is very low, is a kind of waste to a certain extent.
THE UPFC UPFC (Unified Power Flow Controller) is the best FACTS device of versatility up to now, has comprised all functions such as voltage-regulation, series compensation and phase shift.It comprises two voltage source inverters that connect by the public direct-current end.One of them voltage source inverter is connected in parallel by coupling transformer and transmission line, claims synchronous shunt compensator; Another voltage source inverter inserts transmission line by a coupling transformer series connection, claims synchronous series compensator.Series compensator provides a voltage vector Vc who connects with transmission line, and its amplitude excursion is 0-Vc, and the phase angle change scope is 0 ° to 360 °, can regulate line current by series compensation voltage.Synchronous compensator in parallel can offset current, thereby regulates the compensation point line voltage distribution.Because the series compensator of THE UPFC inserts electrical network by a coupling transformer series connection, inject the controllable voltage Vc of a series connection to circuit, amplitude and phase place by control voltage Vc, can regulate line voltage distribution and electric current in continuously smooth ground, so, on circuit topology and control principle, it is the potentiality with short circuit current restriction.If design a kind of THE UPFC with short circuit current limitation function, under the normal situation of system, be used for realizing trend control, and when short trouble takes place, can be automatically, the rising of limiting short-circuit current effectively, just can save the special short circuit current limitation device of a cover, not only can reduce investment outlay, can also improve the reliability of THE UPFC, further strengthen the function of THE UPFC UPFC, and improve the harmony of its function.
Under such thinking and background, the utility model proposes a kind of THE UPFC UPFC just with short circuit current limitation function.
The utility model content
The composition of THE UPFC UPFC as shown in Figure 1, by control Vc, make its when short trouble takes place and supply voltage anti-phase, short circuit current is reduced to some extent, but because that the amplitude of Vc is compared with the supply voltage amplitude is very little, metering function is very little, improves the Vc amplitude, the capacity of the voltage source inverter of series compensation part among the THE UPFC UPFC and the capacity of energy-storage travelling wave tube need be improved a lot, in fact be unrealistic, uneconomic.
If the coupling transformer of series compensation part adopts special design, make at line current during greater than nominal load current, the magnetic circuit of coupling transformer enters the zone of saturation, thereby the leakage flux of coupling transformer and leakage inductance are increased greatly, when the leakage inductance of coupling transformer is enough big, THE UPFC UPFC has just had the current-limiting function under the short trouble state, can strengthen the function of THE UPFC so greatly, improve its reliability, have very important learning value and using value.Suppose that the line impedance before the short dot is Z
1, supply voltage is Vs, and the output voltage of the series compensator of THE UPFC is Vc, and the leakage inductance of series compensation part coupling transformer is L
1, then the numerical value of short circuit current is:
Line impedance Z wherein
1Numerical value very little, can ignore, the amplitude of the phasor difference of supply voltage and compensator output voltage is near the amplitude of supply voltage, so, under the given situation of supply voltage, the mainly leakage inductance decision after saturated of the size of short circuit current by the magnetic circuit of series coupled transformer.
The purpose of this utility model provides a kind of THE UPFC with short circuit current limitation function, strengthen the function of existing THE UPFC UPFC, the potential short circuit current limitation function of exploitation THE UPFC UPFC, the reliability and the functional harmony of raising whole system.
The utlity model has the THE UPFC of short circuit current limitation function, form by series coupled transformer 1, voltage source inverter 2, energy storage capacitor 3, voltage source inverter 4, output filter 5, output filter 6, signal deteching circuit 7, control circuit 8, drive circuit 9, parallel coupled transformer 10; Wherein, storage capacitor 3 is connected on the public direct-current input side of voltage source inverter 2 and voltage source inverter 4; After interchange output process filter 5 filtering of voltage source inverter 2, be added in the former limit of series coupled transformer 1; The interchange of voltage source inverter 4 output through output filter 6 filtering after, be added in the former limit of parallel coupled transformer 10, the secondary of parallel coupled transformer 10 and be connected in AC power and load between circuit on; After signal deteching circuit 7 detects system power and voltage, give control circuit 8, produce and to be used for the multichannel pulse-width signal of driving voltage source inventer 2 and voltage source inverter 4, give drive circuit (9); Drive circuit (9) output connects piezoelectric voltage type inverter (2) and voltage source inverter 4; The variable impedance transformer of described series coupled transformer 1 for having overcurrent magnetic circuit saturation characteristic.
Described variable impedance transformer (1), voltage source inverter (2), voltage source inverter (4), output filter (5), output filter (6) and electric current injection transformer (7) with overcurrent magnetic circuit saturation characteristic is single-phase or is three mutually.
The utility model tool is under the normal situation of system, be used for realizing trend control, and when short trouble takes place, can be automatically, the rising of limiting short-circuit current effectively, just can save the special short circuit current limitation device of a cover, not only can reduce investment outlay, can also improve the reliability of THE UPFC, further strengthen the function of THE UPFC UPFC, and improve the harmony of its function.
Description of drawings
Fig. 1, for the utlity model has the THE UPFC schematic diagram of short circuit current limitation function;
Fig. 2, be the flow chart of control circuit work;
Fig. 3, be the control circuit schematic diagram.
Fig. 4, the THE UPFC schematic diagram that has the short circuit current limitation function for the utility model three-phase.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Embodiment 1: as shown in Figure 1, THE UPFC with short circuit current limitation function comprises compositions such as series coupled transformer 1 with overcurrent magnetic circuit saturation characteristic, voltage source inverter 2, energy storage capacitor 3, voltage source inverter 4, output filter 5, output filter 6, signal deteching circuit 7, control circuit 8, drive circuit 9, parallel coupled transformer 10.Its composition frame chart as shown in Figure 1.Wherein, storage capacitor 3 is connected on the public direct-current input side of voltage source inverter 2 and voltage source inverter 4; After interchange output process filter 5 filtering of voltage source inverter 2, be added in the former limit of series coupled transformer 1 with overcurrent magnetic circuit saturation characteristic; The interchange of voltage source inverter 4 output through output filter 6 filtering after, be added in the former limit of parallel coupled transformer 10, the secondary of parallel coupled transformer 10 and be connected in AC power and load between circuit on; After signal deteching circuit 7 detects system power and voltage, give control circuit 8, the composition frame chart of control circuit 8 as shown in Figure 3, being one is the information gathering and the treatment circuit unit at center with DSP or one chip microcomputer, its input variable is to come the voltage detection signal and the current detection signal of self-detection circuit, according to line voltage distribution, line current and phase difference thereof, calculate the reactive power in the circuit, calculate the amplitude and the phase place of the electric current of the phase place of the bucking voltage that needs produce and amplitude and needs compensation according to the reactive power in the circuit, and then produce and to be used for the multichannel pulse-width signal of driving voltage source inventer 2 and voltage source inverter 4, give drive circuit 9.The effect of drive circuit 9 is power amplification and the isolation that realize signal, and it is output as the required drive signal of switching tube in voltage source inverter 2 and the voltage source inverter 4, connects voltage source inverter 2 and 4.These characteristics with THE UPFC of short circuit current limitation function are, under the normal situation of system, the magnetic circuit of series coupled transformer 1 is unsaturated, and leakage inductance is very little, this THE UPFC be used for to system carry out voltage, current compensation and and then the trend of control system; When short trouble takes place, load impedance becomes suddenly near zero, the output voltage of series compensator also has little time to change in the THE UPFC, the phasor difference of the output voltage V c of the series compensator of supply voltage Vs and THE UPFC is added on the leakage inductance and secondary winding of line impedance, series coupled transformer, after electric current surpasses the circuit rated current of setting, transformer magnetic circuit is saturated, and leakage inductance increases, and plays the effect of limiting short-circuit current.
Embodiment 2, for having the three-phase THE UPFC UPFC of short circuit current limitation function, Fig. 4 is its main circuit diagram, substantially the same manner as Example 1, different is that wherein the variable impedance transformer 1 with overcurrent magnetic circuit saturation characteristic, voltage source inverter 2, voltage source inverter 4, output filter 5, output filter 6 and electric current injection transformer 7 are three-phase.
Claims (3)
1, a kind of THE UPFC with short circuit current limitation function is made up of series coupled transformer (1), voltage source inverter (2), energy storage capacitor (3), voltage source inverter (4), output filter (5), output filter (6), signal deteching circuit (7), control circuit (8), drive circuit (9), parallel coupled transformer (10); Wherein, storage capacitor (3) is connected on the public direct-current input side of voltage source inverter (2) and voltage source inverter (4); After interchange output process filter (5) filtering of voltage source inverter (2), be added in the former limit of series coupled transformer (1); The interchange of voltage source inverter (4) output through output filter (6) filtering after, be added in the former limit of parallel coupled transformer (10), the secondary of parallel coupled transformer (10) and be connected in AC power and load between circuit on; After signal deteching circuit (7) detects system power and voltage, give control circuit (8), produce and to be used for the multichannel pulse-width signal of driving voltage source inventer (2) and voltage source inverter (4), give drive circuit (9); Drive circuit (9) output connects piezoelectric voltage type inverter (2) and voltage source inverter (4); It is characterized in that: the variable impedance transformer of described series coupled transformer (1) for having overcurrent magnetic circuit saturation characteristic.
2, according to the described THE UPFC with short circuit current limitation function of claim 1, it is characterized in that: described variable impedance transformer (1), voltage source inverter (2), voltage source inverter (4), output filter (5), output filter (6) and electric current injection transformer (7) with overcurrent magnetic circuit saturation characteristic is single-phase.
3, according to the described THE UPFC with short circuit current limitation function of claim 1, it is characterized in that: described variable impedance transformer (1), voltage source inverter (2), voltage source inverter (4), output filter (5), output filter (6) and electric current injection transformer (7) with overcurrent magnetic circuit saturation characteristic is three-phase.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200620069650.2U CN2899236Y (en) | 2006-02-27 | 2006-02-27 | Unified current controller with short-circuit current-limiting function |
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| CN200620069650.2U CN2899236Y (en) | 2006-02-27 | 2006-02-27 | Unified current controller with short-circuit current-limiting function |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832612A (en) * | 2012-08-29 | 2012-12-19 | 华中科技大学 | Hybrid power quality conditioner for direct current power system |
| CN103490395A (en) * | 2013-09-09 | 2014-01-01 | 西安交通大学 | Method for limiting line short-circuit currents by using twin-core controllable phase shifter |
| CN104600707A (en) * | 2015-01-12 | 2015-05-06 | 国家电网公司 | Current limiting type UPFC system design method |
| CN105207208A (en) * | 2015-09-21 | 2015-12-30 | 山东科汇电力自动化股份有限公司 | Circuit achieving power flow control and small current ground fault active compensation arc suppression simultaneously |
| CN105226658A (en) * | 2015-11-13 | 2016-01-06 | 四川英杰电气股份有限公司 | A kind of Active Power Filter-APF and peak current method for limiting thereof |
| TWI646755B (en) * | 2018-04-03 | 2019-01-01 | 茂達電子股份有限公司 | Charging device with fast transient response and control method thereof |
| CN112710931A (en) * | 2020-12-16 | 2021-04-27 | 国网江苏省电力有限公司检修分公司 | Method and system for detecting earth leakage current of secondary side long-distance cable pair of alternating current system |
-
2006
- 2006-02-27 CN CN200620069650.2U patent/CN2899236Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832612A (en) * | 2012-08-29 | 2012-12-19 | 华中科技大学 | Hybrid power quality conditioner for direct current power system |
| CN102832612B (en) * | 2012-08-29 | 2014-10-29 | 华中科技大学 | Hybrid power quality conditioner for direct current power system |
| CN103490395A (en) * | 2013-09-09 | 2014-01-01 | 西安交通大学 | Method for limiting line short-circuit currents by using twin-core controllable phase shifter |
| CN103490395B (en) * | 2013-09-09 | 2016-02-24 | 西安交通大学 | Twin-core controllable phase shifter is utilized to limit the method for line short circuit current |
| CN104600707A (en) * | 2015-01-12 | 2015-05-06 | 国家电网公司 | Current limiting type UPFC system design method |
| CN105207208A (en) * | 2015-09-21 | 2015-12-30 | 山东科汇电力自动化股份有限公司 | Circuit achieving power flow control and small current ground fault active compensation arc suppression simultaneously |
| CN105207208B (en) * | 2015-09-21 | 2018-07-06 | 山东科汇电力自动化股份有限公司 | Realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc simultaneously |
| CN105226658A (en) * | 2015-11-13 | 2016-01-06 | 四川英杰电气股份有限公司 | A kind of Active Power Filter-APF and peak current method for limiting thereof |
| CN105226658B (en) * | 2015-11-13 | 2017-06-27 | 四川英杰电气股份有限公司 | A kind of Active Power Filter-APF and its peak point current method for limiting |
| TWI646755B (en) * | 2018-04-03 | 2019-01-01 | 茂達電子股份有限公司 | Charging device with fast transient response and control method thereof |
| CN112710931A (en) * | 2020-12-16 | 2021-04-27 | 国网江苏省电力有限公司检修分公司 | Method and system for detecting earth leakage current of secondary side long-distance cable pair of alternating current system |
| CN112710931B (en) * | 2020-12-16 | 2022-09-09 | 国网江苏省电力有限公司检修分公司 | Method and system for detecting earth leakage current of secondary side long-distance cable pair of alternating current system |
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