CN107024653A - The on-line measuring device and method of a kind of high voltage DC breaker - Google Patents

The on-line measuring device and method of a kind of high voltage DC breaker Download PDF

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Publication number
CN107024653A
CN107024653A CN201710446926.7A CN201710446926A CN107024653A CN 107024653 A CN107024653 A CN 107024653A CN 201710446926 A CN201710446926 A CN 201710446926A CN 107024653 A CN107024653 A CN 107024653A
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China
Prior art keywords
igbt
branch road
current
voltage
state
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CN201710446926.7A
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CN107024653B (en
Inventor
张茂强
汪涛
李乐乐
陈永奎
李响
刘国伟
文继锋
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3275Fault detection or status indication
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3272Apparatus, systems or circuits therefor
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems

Abstract

The invention discloses a kind of on-line measuring device of high voltage DC breaker and method, the high voltage DC breaker includes on-state branch road and current limliting branch road, the on-state branch road includes the mechanical switch and on-state power semiconductor valve of series connection, the current limliting branch road includes current-limited power semiconductor valve, on-state power semiconductor valve and current-limited power semiconductor valve are equipped with the valve arm of series connection, each valve arm is directly composed in series by M IGBT, M >=2:Each IGBT, which is parallel with, presses buffer circuit, each IGBT is connected with a gate-drive unit GDU for carrying IGBT voltage detecting circuits, all gate-drive unit GDU are connected with online detection and control device, online detection and control device sends control command to gate-drive unit GDU, each gate-drive unit GDU controls corresponding IGBT to be switched on or off and detection information is fed back into online detection and control device according to order, and online detection and control device is additionally operable to detect whether electric current, the electric current of on-state branch road and the mechanical switch of current limliting branch road are abnormal.

Description

The on-line measuring device and method of a kind of high voltage DC breaker
Technical field
The present invention relates to a kind of on-line measuring device of high voltage DC breaker and method.
Background technology
With the development and progress of Power Electronic Technique, in high pressure, high-capacity direct current breaker application field, IGBT is special It is the mode that compression joint type IGBT directly connects, with compact conformation, the advantage such as control method is simple is widely used. High voltage DC breaker is the Core equipment for building multiterminal flexible direct current system, it is possible to increase the economy of system operation and reliable Property.
High voltage DC breaker needs to realize that current conversion station is isolated with trouble point in several milliseconds, realizes quick by failure removal Function, typically using IGBT device, particularly crimp type IGBT device is composed in series the on-state branch road of high voltage DC breaker With current limliting branch road.Reliability service for safeguards system to high voltage DC breaker, it is necessary to carry out on-line checking.In detection process In, it should ensure that high voltage DC breaker is in running status, mechanical switch, all IGBT can also be detected, and Trouble point can be rapidly found out, and damages IGBT particular location, reliable data supporting is provided for the maintenance replacing in later stage, The present invention is to be produced based on this consideration.
The content of the invention
In view of the above-mentioned problems, the present invention provides the on-line measuring device and method of a kind of high voltage DC breaker, by right The current detecting of on-state branch road and current limliting branch road, the detection of mechanical switch nodes of locations, IGBT collection are penetrated in high voltage DC breaker The detection of pole tension, judges IGBT is whether there is in two branch roads, mechanical switch is breaking, short circuit, can rapidly find out trouble point, and IGBT particular location is damaged, reliable data supporting is provided for the maintenance replacing in later stage.
To realize above-mentioned technical purpose and the technique effect, the present invention is achieved through the following technical solutions:
A kind of on-line measuring device of high voltage DC breaker, the high voltage DC breaker includes on-state branch road and current limliting Branch road, the on-state branch road includes the mechanical switch and on-state power semiconductor valve of series connection, and the current limliting branch road includes current limliting work( Rate semiconductor valve, on-state power semiconductor valve and current-limited power semiconductor valve are equipped with the valve arm of series connection, and each valve arm is by M IGBT is directly composed in series, M >=2:
Each IGBT, which is parallel with, presses buffer circuit, and each IGBT is connected with a door for carrying IGBT voltage detecting circuits Pole driver element GDU, all gate-drive unit GDU are connected with online detection and control device, and online detection and control device is to gate pole Driver element GDU sends control command, each gate-drive unit GDU according to order control corresponding IGBT be switched on or off and incite somebody to action Detection information feeds back to online detection and control device, and online detection and control device is additionally operable to detect electric current, the on-state branch road of current limliting branch road Electric current and mechanical switch it is whether abnormal.
It is preferred that, press buffer circuit to include the diode D and electric capacity C of series connection, the resistance R1 and R2 of series connection, the one of resistance R1 End positive pole, IGBT colelctor electrode respectively with diode D is connected, and the resistance R1 other end is born with resistance R2, diode D respectively Extremely it is connected, diode D negative pole is connected with electric capacity C, the transmitting of the resistance R2 other end respectively with electric capacity the C other end, IGBT Extremely it is connected.
Accordingly, a kind of online test method of high voltage DC breaker, comprises the following steps:
Step 1, all IGBT for opening current limliting branch road upper flow power semiconductor valve;
All IGBT of on-state power semiconductor valve in step 2, shut-off on-state branch road;
Step 3, time delay Ty, whether judge on-state branch current is 0, if 0, then into step 4;
Step 4, judge whether current limliting branch current is operating current, if so, then entering step 5;
Step 5, judge whether the collection emitter voltage VCE of each IGBT on on-state branch road is more than setting reference value VREF0If, It is no, then judge that the corresponding IGBT of on-state branch road is abnormal;If so, then entering step 6;
Step 6, shut-off mechanical switch, judge whether mechanical switch nodes of locations is normal, if it is not, then judging that on-state branch road is different Often;If so, then entering step 7;
Step 7, initialization:N=1 is made, the lower limit VREF of reference value is set1With the higher limit VREF of reference value2
IGBT in step 8, cut-off current-limiting branch roadN, the IGBT of other series connection still keeps opening state, by T1After time, inspection Survey IGBTNCollection emitter voltage VCENIf, VREF1≤VCEN≤VREF2, then IGBT is judgedNThere is no Damage by Short Circuit;If VCEN< VREF1When, then judge IGBTNDamage;
Step 9, judge N value whether be equal to current-limited power semiconductor valve IGBT total amounts, if being equal to, terminate;Otherwise, Make N value plus 1 and enter step 8.
It is preferred that, in step 8, IGBT on cut-off current-limiting branch roadN T1After duration, GDUNAgain IGBT is openedN, by T2Time, Make IGBTNVoltage recover to normally magnitude of voltage VCESAT, GDUNBy IGBTNDetection information be back to online detection and control Device, online detection and control device record IGBTNParticular location and status information.
The beneficial effects of the invention are as follows:
Using above-mentioned detection device and method, under high voltage DC breaker running status, on-state branch road and limit can detect Flow the IGBT of all series connection on branch road.Online detection and control device records each IGBT status information and particular location in detail, is Follow-up interruption maintenance provides data supporting.
Brief description of the drawings
Fig. 1 is the topological structure schematic diagram of high voltage DC breaker of the present invention;
Fig. 2 is a kind of part-structure schematic diagram of the on-line measuring device of high voltage DC breaker of the invention;
Fig. 3 is high voltage DC breaker online detection and control device of the present invention and detection control object connection diagram;
Fig. 4 is IGBT voltage detecting circuits schematic diagram on GDU of the present invention;
Fig. 5 is online detection and control device control sequential logical schematic of the present invention;
Fig. 6 is a kind of flow chart of the online test method of high voltage DC breaker of the invention;
Fig. 7 is that RCD of the present invention presses buffer circuit figure.
Embodiment
Technical solution of the present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, so that ability The technical staff in domain can be better understood from the present invention and can be practiced, but illustrated embodiment is not as the limit to the present invention It is fixed.
As shown in figs. 1-7, a kind of on-line measuring device of high voltage DC breaker, the high voltage DC breaker is included simultaneously The on-state branch road and current limliting branch road of connection, the on-state branch road include the mechanical switch and on-state power semiconductor valve of series connection, described Current limliting branch road includes current-limited power semiconductor valve, and on-state power semiconductor valve and current-limited power semiconductor valve are equipped with the valve of series connection Arm, each valve arm is directly composed in series by M IGBT, M >=2.During normal work, electric current ICOn-state branch road is flowed through, general, limit The IGBT quantity for flowing branch road is much larger than the IGBT quantity of on-state branch road.
The on-line measuring device of high voltage DC breaker includes pressure buffer circuit RCD, gate-drive unit GDU and online Controller is detected, as shown in Fig. 2 each IGBT is parallel with and presses buffer circuit, each IGBT is connected with one with IGBT electricity The gate-drive unit GDU of pressure detection circuit, all gate-drive unit GDU are connected with online detection and control device, such as, institute Some gate-drive unit GDU are connected by optical-fibre channel with online detection and control device.
Online detection and control device sends control command to gate-drive unit GDU, and each gate-drive unit GDU is according to order Control corresponding IGBT to be switched on or off and detection information is fed back into online detection and control device.As shown in figure 3, on-line checking control Device processed is additionally operable to detect whether electric current, the electric current of on-state branch road and the mechanical switch of current limliting branch road are abnormal.
As shown in fig. 7, one kind presses buffer circuit, include the diode D and electric capacity C of series connection, the resistance R1 and R2 of series connection, Positive pole, the IGBT colelctor electrode of resistance R1 one end respectively with diode D are connected, the resistance R1 other end respectively with resistance R2, Diode D negative pole is connected, and diode D negative pole is connected with electric capacity C, the resistance R2 other end other end respectively with electric capacity C, IGBT emitter stage is connected.
It is corresponding, as shown in fig. 6, a kind of online test method of high voltage DC breaker, online detection and control device is sent Control command gives IGBT driver element GDU, opens all IGBT on current limliting branch road, is then shut off on on-state power semiconductor valve All IGBT, the electric current I on high voltage DC breaker on-state branch road was flowed through originallyC, it is transferred on current limliting branch road.On-line checking Controller detects the electric current on on-state branch road and current limliting branch road, is on 0, current limliting branch road when detecting the electric current on on-state branch road When electric current is consistent with the operating current of high voltage DC breaker, then each branch road is detected to high voltage DC breaker.Specifically Comprise the following steps:
Step 1, all IGBT for opening current limliting branch road upper flow power semiconductor valve;
All IGBT of on-state power semiconductor valve in step 2, shut-off on-state branch road;
Step 3, time delay Ty, whether judge on-state branch current is 0, if 0, then into step 4;
Step 4, judge whether current limliting branch current is operating current, if so, then entering step 5;
Step 5, the IGBT quantity due to current limliting branch road are much larger than the IGBT of on-state branch road, and electric current I is flowed through in current limliting branch roadC When, voltage difference is produced on each IGBT connected on high voltage DC breaker two ends, i.e. on-state power semiconductor valve, is carried Each IGBT collection emitter voltage, judges on-state on the gate-drive unit GDU detection on-state branch roads of IGBT voltage detecting circuits Whether each IGBT collection emitter voltage VCE is more than setting reference value VREF on branch road0, if it is not, then judging on-state branch road correspondence IGBT it is abnormal;If so, then judging that the IGBT is normal, then into step 6;
Step 6, online detection and control device send control command to mechanical switch, mechanical switch are turned off, by opening machinery The inspection of off position node, judges whether mechanical switch nodes of locations is normal, if it is not, then judging that on-state branch road is abnormal;If so, then Into step 7;
Step 7, initialization:N=1 is made, the lower limit VREF of reference value is set1With the higher limit VREF of reference value2
Step 8, as shown in Figures 4 and 5, online detection and control device sends IGBT of the control command to current limliting branch roadNDriving is single First GDUN, IGBT on cut-off current-limiting branch roadN, the IGBT of other series connection still keeps opening state, by T1After time, this time It is interior, IGBT detection electric currents ICBy IGBTNTurn to and flow into and IGBTNPressure buffer circuit in parallel, makes pressure buffer circuit in T1When Interior constantly charging, voltage is increased to VCEN.Detect IGBTNCollection emitter voltage VCENIf, VREF1≤VCEN≤VREF2, then sentence Disconnected IGBTNThere is no Damage by Short Circuit;If VCEN< VREF1When, then judge IGBTNDamage;
Step 9, judge N value whether be equal to current-limited power semiconductor valve IGBT total amounts, if being equal to, terminate;Otherwise, Make N value plus 1 and enter step 8, until IGBT is detected and finished on all current limliting branch road.
It is preferred that, in step 8, IGBT on cut-off current-limiting branch roadN T1After duration, GDUNAgain IGBT is openedN, by T2Time, Reaffirm IGBTNThe voltage at two ends, works as VCENVoltage is down to IGBT saturation voltage drop VCESAT(i.e. IGBT afterwardsNVoltage recover To normally magnitude of voltage VCESAT), it is believed that IGBTNIn opening state, GDUNBy IGBTNDetection information be back to online inspection Survey controller, online detection and control device record IGBTNParticular location and status information.Online detection and control device is in T2After moment, By time-delay TD(TDCan be for 0), the method further in accordance with foregoing description detects IGBTN+1
The status information that online detection and control device feeds back according to gate-drive unit GDU, judges IGBTNWith the presence or absence of different Often, as included IGBT in status informationNFault message, then judge IGBTNIn the presence of exception, there is no IGBT in such as status informationN's Fault message, then judge IGBTNNormally, and according to detection IGBTNMode, remaining IGBT is detected one by one, all IGBT are recorded Detection status information, exception IGBT particular location etc..
In above-mentioned steps 3, if on-state branch current is not 0, judge that on-state branch road is abnormal.In step 4, if current limliting branch road Electric current is not operating current, then judges that current limliting branch road is abnormal.
Using above-mentioned detection device and method, under high voltage DC breaker running status, on-state branch road and limit can detect Flow the IGBT of all series connection on branch road.Online detection and control device records each IGBT status information and particular location in detail, is Follow-up interruption maintenance provides data supporting.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair The equivalent structure that bright specification and accompanying drawing content are made either equivalent flow conversion or to be directly or indirectly used in other related Technical field, be included within the scope of the present invention.

Claims (7)

1. a kind of on-line measuring device of high voltage DC breaker, the high voltage DC breaker includes on-state branch road and current limliting branch Road, the on-state branch road includes the mechanical switch and on-state power semiconductor valve of series connection, and the current limliting branch road includes current-limited power Semiconductor valve, on-state power semiconductor valve and current-limited power semiconductor valve are equipped with the valve arm of series connection, and each valve arm is by M IGBT Directly it is composed in series, M >=2, it is characterised in that:Each IGBT, which is parallel with, presses buffer circuit, and each IGBT is connected with a band There are gate-drive the unit GDU, all gate-drive unit GDU and online detection and control device phase of IGBT voltage detecting circuits Even, online detection and control device sends control command to gate-drive unit GDU, and each gate-drive unit GDU is according to order control Corresponding IGBT is switched on or off and detection information is fed back into online detection and control device, and online detection and control device is additionally operable to detection Whether electric current, the electric current of on-state branch road and the mechanical switch of current limliting branch road are abnormal.
2. the on-line measuring device of a kind of high voltage DC breaker according to claim 1, it is characterised in that pressure is buffered Circuit includes the diode D and electric capacity C of series connection, the resistance R1 and R2 of series connection, resistance R1 one end respectively with diode D just Pole, IGBT colelctor electrode are connected, and the negative pole of the resistance R1 other end respectively with resistance R2, diode D is connected, and diode D's bears Pole is connected with electric capacity C, and the other end, the IGBT emitter stage of the resistance R2 other end respectively with electric capacity C are connected.
3. a kind of on-line measuring device of high voltage DC breaker according to claim 1, it is characterised in that all doors Pole driver element GDU is connected by optical-fibre channel with online detection and control device.
4. a kind of online test method of high voltage DC breaker, it is characterised in that comprise the following steps:
Step 1, all IGBT for opening current limliting branch road upper flow power semiconductor valve;
All IGBT of on-state power semiconductor valve in step 2, shut-off on-state branch road;
Step 3, time delay Ty, whether judge on-state branch current is 0, if 0, then into step 4;
Step 4, judge whether current limliting branch current is operating current, if so, then entering step 5;
Step 5, judge whether the collection emitter voltage VCE of each IGBT on on-state branch road is more than setting reference value VREF0, if it is not, then Judge that the corresponding IGBT of on-state branch road is abnormal;If so, then entering step 6;
Step 6, shut-off mechanical switch, judge whether mechanical switch nodes of locations is normal, if it is not, then judging that on-state branch road is abnormal; If so, then entering step 7;
Step 7, initialization:N=1 is made, the lower limit VREF of reference value is set1With the higher limit VREF of reference value2
IGBT in step 8, cut-off current-limiting branch roadN, the IGBT of other series connection still keeps opening state, by T1After time, detection IGBTNCollection emitter voltage VCENIf, VREF1≤VCEN≤VREF2, then IGBT is judgedNThere is no Damage by Short Circuit;If VCEN< VREF1 When, then judge IGBTNDamage;
Step 9, judge N value whether be equal to current-limited power semiconductor valve IGBT total amounts, if being equal to, terminate;Otherwise, N is made Value add 1 and enter step 8.
5. the online test method of a kind of high voltage DC breaker according to claim 4, it is characterised in that in step 8, IGBT on cut-off current-limiting branch roadN T1After duration, GDUNAgain IGBT is openedN, by T2Time, make IGBTNVoltage recover to just Normal turn-on voltage VCESAT, GDUNBy IGBTNDetection information be back to online detection and control device, online detection and control device record IGBTNParticular location and status information.
6. the online test method of a kind of high voltage DC breaker according to claim 4, it is characterised in that in step 3, If on-state branch current is not 0, judge that on-state branch road is abnormal.
7. the online test method of a kind of high voltage DC breaker according to claim 4, it is characterised in that in step 4, If current limliting branch current is not operating current, judge that current limliting branch road is abnormal.
CN201710446926.7A 2017-06-14 2017-06-14 A kind of on-line measuring device and method of high voltage DC breaker Active CN107024653B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101888229A (en) * 2010-05-25 2010-11-17 中国电力科学研究院 Novel IGBT high-pressure series valve controlling and monitoring system
CN102045049A (en) * 2010-10-18 2011-05-04 中国电力科学研究院 Novel IGBT high-voltage series valve control and monitoring system
CN102931822A (en) * 2012-11-16 2013-02-13 清华大学 Main circuit pulse based active voltage-equalizing device for high voltage IGBTs (Insulated Gate Bipolar Transistors) in series connection
CN103066809A (en) * 2012-12-06 2013-04-24 国网智能电网研究院 Improved residual current device (RCD) buffer circuit applied to direct tandem type insulated gate bipolar translator (IGBT)
CN203164375U (en) * 2013-02-20 2013-08-28 国网智能电网研究院 Impulse testing apparatus of IGBT direct series valve
CN103715874A (en) * 2012-10-09 2014-04-09 富士电机株式会社 Gate driving circuit having a fault detecting circuit for a semiconductor switching device
CN105807214A (en) * 2014-12-29 2016-07-27 国家电网公司 Breaking test device and test method for high-voltage direct current breaker

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101888229A (en) * 2010-05-25 2010-11-17 中国电力科学研究院 Novel IGBT high-pressure series valve controlling and monitoring system
CN102045049A (en) * 2010-10-18 2011-05-04 中国电力科学研究院 Novel IGBT high-voltage series valve control and monitoring system
CN103715874A (en) * 2012-10-09 2014-04-09 富士电机株式会社 Gate driving circuit having a fault detecting circuit for a semiconductor switching device
CN102931822A (en) * 2012-11-16 2013-02-13 清华大学 Main circuit pulse based active voltage-equalizing device for high voltage IGBTs (Insulated Gate Bipolar Transistors) in series connection
CN103066809A (en) * 2012-12-06 2013-04-24 国网智能电网研究院 Improved residual current device (RCD) buffer circuit applied to direct tandem type insulated gate bipolar translator (IGBT)
CN203164375U (en) * 2013-02-20 2013-08-28 国网智能电网研究院 Impulse testing apparatus of IGBT direct series valve
CN105807214A (en) * 2014-12-29 2016-07-27 国家电网公司 Breaking test device and test method for high-voltage direct current breaker

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