CN103683209A - Identifying method based on high-speed switch type serial compensation system and controller thereof - Google Patents
Identifying method based on high-speed switch type serial compensation system and controller thereof Download PDFInfo
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- CN103683209A CN103683209A CN201310681815.6A CN201310681815A CN103683209A CN 103683209 A CN103683209 A CN 103683209A CN 201310681815 A CN201310681815 A CN 201310681815A CN 103683209 A CN103683209 A CN 103683209A
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Abstract
The invention discloses an identifying method based on a high-speed switch type serial compensation system and a controller thereof. A serial compensation capacitor set, a metal oxide varistor (MOV), a bypass switch, a current limiting resistor and a protecting device are included. The protecting device comprises a high-speed switch, the controller, a current collector and an optical fiber transmission unit. After the current limiting resistor and the high-speed switch are connected in series, the current limiting resistor is connected in parallel with the serial compensation capacitor set, the MOV and the bypass switch, and a parallel output end is connected in series with the current collector, output of the current collector is connected with the controller through the optical fiber transmission unit, and output of the controller is connected with the high-speed switch. A quick vacuum breaker and the controller with the quick identifying technology are matched, the serial compensation capacitor set is quickly subjected to short connecting in about 15ms after short circuiting happens to a circuit, overvoltage duration time is shortened, energy capacity needed by a zinc oxide component is greatly reduced, and the purposes of mounting space saving and manufacturing cost lowering are achieved.
Description
Technical field
The invention relates to the comprehensive protecting technology field of series compensation equipment, particularly relates to the recognition methods based on high-speed switch type series compensation system and controller thereof.
Background technology
At present, along with expanding economy, the rapid growth of power load, the vast outlying district electrical network that accounts for national most of area extends to areas without electricity, the power supply quality of 110KV high-voltage ultralong circuit and middle voltage distribution networks becomes increasingly conspicuous, embody a concentrated reflection of low voltage and voltage fluctuation rate is large, cause the supply power voltage of load side far beyond the quality standard of national regulation, affected the each department people's production and life.Along with the progress of capacitor manufacturing technology and control technique in power system, series capacitor compensation Jiang China obtains developing more fully and application widely.What string benefit played a major role is capacitor group, is equipped with capacitor bank protection equipment.Traditional capacitor protection equipment comprises the equipment such as metal oxide pressure-limiting device (MOV), spark gap, bypass breaker and current-limiting resistance.See accompanying drawing 1.When line short fault, short circuit current must produce high voltage in series capacitor compensation group, and the effect of MOV is exactly the energy that absorbs short circuit current, the overvoltage in limiting capacitance device group.When the limit that the energy absorbing as MOV allows over himself absorbs energy, string is mended control device will start spark gap and bypass breaker, by-pass capacitor group and MOV, thus capacitor group is protected.
Though adopt conventional series compensation device effect good, because of technical sophistication, expensive, bulky, can not get applying widely at 10kV-110kV electrical network.The problem due to spark gap, bypass breaker partial devices structural complexity on the one hand; That zinc oxide is parallel to compensation condenser two ends on the other hand, though can suitably reduce the rated voltage of capacitor, saved to a certain extent installing space and cost, but needed huge can the making to be again cancelled in the large portion of effort doing aspect saving space and cost by capacity of zinc oxide assembly.
Summary of the invention
The invention is in order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of recognition methods based on high-speed switch type series compensation system and controller thereof, take Fast Speed Vacuum Circuit Breaker as basis, quick recognition technology in conjunction with short trouble, can accomplish completely about the 15ms after circuit is short-circuited the quick short circuit of series compensation capacitor, significantly shortened the superpotential duration, thereby made required the greatly reducing by capacity of zinc oxide assembly.This integrated protection comprises controller, Fast Speed Vacuum Circuit Breaker and data acquisition system.
For solving the problems of the technologies described above, the technical scheme that the invention adopts is: based on high-speed switch type series compensation system, comprise series capacitor compensation group, metal oxide pressure-limiting device MOV, by-pass switch, current-limiting resistance and protective device, described protective device comprises high-speed switch, controller, current collector and Optical Fiber Transmission unit, after the series connection of described current-limiting resistance and described high-speed switch respectively with described series capacitor compensation group, described metal oxide pressure-limiting device MOV and described by-pass switch are in parallel, described series capacitor compensation group, the output in parallel of described metal oxide pressure-limiting device MOV and described by-pass switch is connected with described current collector, and the output of described current collector is connected with described controller by described Optical Fiber Transmission unit, the output of described controller is connected with described high-speed switch.
Further, described high-speed switch 5 is 10kV Fast Speed Vacuum Circuit Breaker.
The recognition methods of the described controller based on high-speed switch type series compensation system, comprises the steps:
(1) set sample rate current set point Is and current setting value rate of change Ks,
(2) by described current collector collection by the current instantaneous value Ih of the line current of described series capacitor compensation group, calculate the current instantaneous value rate of change Kh of line current instantaneous value,
(3) compare current setting value Is and current instantaneous value Ih, compare current setting value rate of change Ks and current instantaneous value rate of change Kh, as current setting value Is> current instantaneous value Ih, and during current setting value rate of change Ks> current instantaneous value rate of change Kh, described controller sends reclosing command to described high-speed switch, otherwise, again enter and remake judgement next time after step (2).
Advantage and good effect that the invention has are: the recognition methods based on high-speed switch type series compensation system and controller thereof, adopt Fast Speed Vacuum Circuit Breaker to substitute traditional spark gap and closing time is had to the harsh bypass breaker requiring, coordinate with having utilized the controller of quick recognition technology exploitation simultaneously, can accomplish about the 15ms after circuit is short-circuited the quick short circuit of series compensation capacitor group, significantly shortened the superpotential duration, thereby made required the greatly reducing by capacity of zinc oxide assembly.Reach generally the object of having saved installing space and having reduced cost.
Accompanying drawing explanation
Fig. 1 is traditional series compensation system primary system composition diagram;
Fig. 2 is the primary system composition diagram of the invention;
Fig. 3 is controller Fast Recognition Algorithm schematic diagram;
Fig. 4 is controller recognition methods logic diagram.
In figure:
1, series capacitor compensation group 2, metal oxide pressure-limiting device MOV 3, by-pass switch
4, current-limiting resistance 5, high-speed switch 6, current collector
7, Optical Fiber Transmission unit 8, spark gap 9, bypass breaker
Embodiment
Based on high-speed switch type series compensation system, comprise series capacitor compensation group 1, metal oxide pressure-limiting device MOV2, by-pass switch 3, current-limiting resistance 4 and protective device, described protective device comprises high-speed switch 5, controller, current collector 6 and Optical Fiber Transmission unit 7, after 5 series connection of described current-limiting resistance 4 and described high-speed switch respectively with described series capacitor compensation group 1, described metal oxide pressure-limiting device MOV2 and 3 parallel connections of described by-pass switch, described series capacitor compensation group 1, the output in parallel of described metal oxide pressure-limiting device MOV2 and described by-pass switch 3 is connected with described current collector 6, and the output of described current collector 6 is connected with described controller by described Optical Fiber Transmission unit 7, the output of described controller is connected with described high-speed switch 5.
Described high-speed switch 5 is 10kV Fast Speed Vacuum Circuit Breaker.
The recognition methods of the described controller based on high-speed switch type series compensation system, comprises the steps:
(1) set sample rate current set point Is and current setting value rate of change Ks,
(2) by described current collector 6, gather by the current instantaneous value Ih of the line current of described series capacitor compensation group 1, calculate the current instantaneous value rate of change Kh of line current instantaneous value,
(3) compare current setting value Is and current instantaneous value Ih, compare current setting value rate of change Ks and current instantaneous value rate of change Kh, as current setting value Is> current instantaneous value Ih, and during current setting value rate of change Ks> current instantaneous value rate of change Kh, described controller sends reclosing command to described high-speed switch 5, otherwise, again enter and remake judgement next time after step (2).
As shown in Figure 1, traditional series compensation system comprises the equipment such as series capacitor compensation group 1, metal oxide pressure-limiting device MOV2, spark gap 8, by-pass switch 3, bypass breaker 9 and current-limiting resistance 4.When line short fault; short circuit current must produce high voltage in series capacitor compensation group 1; the effect of metal oxide pressure-limiting device MOV2 is exactly the energy that absorbs short circuit current; overvoltage in restriction series capacitor compensation group 1; when the limit that the energy absorbing as metal oxide pressure-limiting device MOV2 allows over himself absorbs energy; string is mended control device will start spark gap 8 and bypass breaker 9 protection series capacitor compensation group 1 and metal oxide pressure-limiting device MOV2, thereby capacitor group is protected.Finite capacity due to spark gap 8, string is mended control device must start bypass breaker 9 spark gap 8 short circuits when starting spark gap 8 simultaneously, be subject to the start-up time of spark gap 8 impact of ambient temperature, humidity and mechanical processing technique etc. very big, the intrinsic operate time that adds current by-pass switch 3 is slower (at least 30ms) all, arranging that this makes that the energy threshold of metal oxide pressure-limiting device MOV2 will try one's best is higher, avoids the situation self burning out to occur.This is just on all having produced passive impact in the space of installing and cost.
As shown in Figure 2, the integrated protection after improvement as the execution unit of controlling series compensation capacitor switching, replaces controllable spark gap 8 and the 110kV bypass breaker 9 of traditional series compensation device by 10kV Fast Speed Vacuum Circuit Breaker.Current collector 6 is installed on the line, and the current signal on 6 pairs of circuits of described current collector gathers, and sends data to described controller by described Optical Fiber Transmission unit 7.Described controller is stored, calculates and judge image data.The recognition methods of described controller comprises the steps: (1) setting sample rate current set point Is and current setting value rate of change Ks, (2) by described current collector 6, gather by the current instantaneous value Ih of the line current of described series capacitor compensation group 1, calculate the current instantaneous value rate of change Kh of line current instantaneous value, (3) compare current setting value Is and current instantaneous value Ih, compare current setting value rate of change Ks and current instantaneous value rate of change Kh, as current setting value Is> current instantaneous value Ih, and during current setting value rate of change Ks> current instantaneous value rate of change Kh, described controller sends reclosing command to described high-speed switch 5, otherwise, after again entering step (2), remake judgement next time.As shown in Figure 3; when judgment result is that as current setting value Is> current instantaneous value Ih; and during current setting value rate of change Ks> current instantaneous value rate of change Kh; described controller sends reclosing command to Fast Speed Vacuum Circuit Breaker in 3ms; Fast Speed Vacuum Circuit Breaker is closed a floodgate in 10ms left and right; thereby by 1 parallel connection of series capacitor compensation group, series capacitor compensation group 1 and metal oxide pressure-limiting device MOV2 assembly have been protected.
Fig. 4 is described controller recognition methods logic diagram; 6 pairs of circuits of described current collector power on, and stream gathers and transfer to described controller by described Optical Fiber Transmission unit 7; described controller carries out fault judgement by Fast Recognition Algorithm; if the fault of being judged as; described controller sends reclosing command to described Fast Speed Vacuum Circuit Breaker in 3ms; described Fast Speed Vacuum Circuit Breaker is closed a floodgate in 10ms left and right; thereby by 1 parallel connection of series capacitor compensation group, series capacitor compensation group 1 and metal oxide pressure-limiting device MOV2 assembly have been protected.From find short circuit current to, comprehensive protector can significantly shorten the superpotential duration in 15ms left and right by the quick short circuit of series capacitor compensation group 1, thereby the required energy capacity of metal oxide pressure-limiting device MOV2 assembly is greatly reduced.
Above the embodiment of the invention is had been described in detail, but described content is only the preferred embodiment of the invention, can not be considered to for limiting practical range of the present invention.All equalization variations of doing according to the invention scope and improvement etc., within all should still belonging to this patent covering scope.
Claims (3)
1. based on high-speed switch type series compensation system, it is characterized in that: comprise series capacitor compensation group (1), metal oxide pressure-limiting device MOV(2), by-pass switch (3), current-limiting resistance (4) and protective device, described protective device comprises high-speed switch (5), controller, current collector (6) and Optical Fiber Transmission unit (7), after the series connection of described current-limiting resistance (4) and described high-speed switch (5) respectively with described series capacitor compensation group (1), described metal oxide pressure-limiting device MOV(2) and described by-pass switch (3) parallel connection, described series capacitor compensation group (1), described metal oxide pressure-limiting device MOV(2) and the output in parallel of described by-pass switch (3) connect with described current collector (6), and the output of described current collector (6) is connected with described controller by described Optical Fiber Transmission unit (7), the output of described controller is connected with described high-speed switch (5).
2. according to claim 1 based on high-speed switch type series compensation system, it is characterized in that: described high-speed switch (5) is 10kV Fast Speed Vacuum Circuit Breaker.
3. the recognition methods of the controller based on high-speed switch type series compensation system according to claim 1 and 2, is characterized in that: comprise the steps:
(1) set sample rate current set point Is and current setting value rate of change Ks,
(2) by described current collector (6), gather by the current instantaneous value Ih of the line current of described series capacitor compensation group (1), calculate the current instantaneous value rate of change Kh of line current instantaneous value,
(3) compare current setting value Is and current instantaneous value Ih, compare current setting value rate of change Ks and current instantaneous value rate of change Kh, as current setting value Is> current instantaneous value Ih, and during current setting value rate of change Ks> current instantaneous value rate of change Kh, described controller sends reclosing command to described high-speed switch (5), otherwise, again enter and remake judgement next time after step (2).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098726A (en) * | 2015-09-15 | 2015-11-25 | 李梦菲 | Overvoltage rapid protection circuit and method for series capacitor of power system |
| CN105226657A (en) * | 2015-10-26 | 2016-01-06 | 国网上海市电力公司 | A kind of series-parallel comprehensive compensation arrangement administered for power distribution network low-voltage |
| CN106207949A (en) * | 2016-08-23 | 2016-12-07 | 温新正 | A kind of method protecting charging current limiter resistance |
| CN108134395A (en) * | 2017-12-08 | 2018-06-08 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of string mends damping reactor method for detecting abnormality |
| CN108134396A (en) * | 2017-12-08 | 2018-06-08 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of series compensation damping circuit method for detecting abnormality |
| CN109327022A (en) * | 2017-08-01 | 2019-02-12 | 费希尔-罗斯蒙特系统公司 | The method and apparatus of surge protection for dcs component |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098726A (en) * | 2015-09-15 | 2015-11-25 | 李梦菲 | Overvoltage rapid protection circuit and method for series capacitor of power system |
| CN105098726B (en) * | 2015-09-15 | 2018-01-05 | 李梦菲 | A kind of power system series capacitor overvoltage fast protection method |
| CN105226657A (en) * | 2015-10-26 | 2016-01-06 | 国网上海市电力公司 | A kind of series-parallel comprehensive compensation arrangement administered for power distribution network low-voltage |
| CN105226657B (en) * | 2015-10-26 | 2018-09-21 | 国网上海市电力公司 | A kind of series-parallel comprehensive compensation device administered for power distribution network low-voltage |
| CN106207949A (en) * | 2016-08-23 | 2016-12-07 | 温新正 | A kind of method protecting charging current limiter resistance |
| CN109327022A (en) * | 2017-08-01 | 2019-02-12 | 费希尔-罗斯蒙特系统公司 | The method and apparatus of surge protection for dcs component |
| CN109327022B (en) * | 2017-08-01 | 2023-11-07 | 费希尔-罗斯蒙特系统公司 | Method and apparatus for surge protection of distributed control system components |
| CN108134395A (en) * | 2017-12-08 | 2018-06-08 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of string mends damping reactor method for detecting abnormality |
| CN108134396A (en) * | 2017-12-08 | 2018-06-08 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of series compensation damping circuit method for detecting abnormality |
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