CN107024653B - A kind of on-line measuring device and method of high voltage DC breaker - Google Patents
A kind of on-line measuring device and method of high voltage DC breaker Download PDFInfo
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- CN107024653B CN107024653B CN201710446926.7A CN201710446926A CN107024653B CN 107024653 B CN107024653 B CN 107024653B CN 201710446926 A CN201710446926 A CN 201710446926A CN 107024653 B CN107024653 B CN 107024653B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised 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
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- Testing Of Individual Semiconductor Devices (AREA)
Abstract
The invention discloses a kind of on-line measuring device of high voltage DC breaker and methods, the high voltage DC breaker includes on-state branch and current limliting branch, the on-state branch includes concatenated mechanical switch and on-state power semiconductor valve, the current limliting branch includes current-limited power semiconductor valve, on-state power semiconductor valve and current-limited power semiconductor valve are equipped with concatenated valve arm, each valve arm is directly composed in series by M IGBT, M >=2: each IGBT is parallel with pressure buffer circuit, each IGBT is connected with the gate-drive unit GDU for having IGBT voltage detecting circuit, all gate-drive unit GDU are connected with online detection and control device, online detection and control device issues control command to gate-drive unit GDU, each gate-drive unit GDU controls corresponding IGB according to order T, which is switched on or off and will test information, feeds back to online detection and control device, and whether online detection and control device is also used to detect the electric current of current limliting branch, the electric current of on-state branch and mechanical switch abnormal.
Description
Technical field
The present invention relates to a kind of on-line measuring device of high voltage DC breaker and methods.
Background technique
With the development of power electronics technology and progressive, in high pressure, high-capacity direct current breaker application field, IGBT is special
It is the directly concatenated mode of compression joint type IGBT, has compact-sized, the advantages such as control method is simple is widely used.
High voltage DC breaker is the Core equipment for constructing multiterminal flexible direct current system, can be improved the economy of system operation and reliable
Property.
High voltage DC breaker is needed to realize that converter station is isolated with fault point in several milliseconds, be realized quickly by failure removal
Function, the on-state branch of high voltage DC breaker is generally composed in series using IGBT device, especially crimp type IGBT device
With current limliting branch.For the reliability service of safeguards system, need to carry out on-line checking to high voltage DC breaker.In detection process
In, it should guarantee that high voltage DC breaker is in operating status, also want to detect mechanical switch, all IGBT, and
Fault point, and the specific location of damage IGBT can be rapidly found out, provides reliable data supporting for the maintenance replacement in later period,
The present invention is to be considered based on this and generated.
Summary 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 and current limliting branch, the detection of mechanical switch nodes of locations, IGBT collection are penetrated in high voltage DC breaker
The detection of pole tension, judge in two branches whether there is or not IGBT, mechanical switch open circuit, short circuit, fault point can be rapidly found out, and
The specific location of IGBT is damaged, provides reliable data supporting for the maintenance replacement in later period.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme:
A kind of on-line measuring device of high voltage DC breaker, the high voltage DC breaker include on-state branch and current limliting
Branch, the on-state branch include concatenated mechanical switch and on-state power semiconductor valve, and the current limliting branch includes current limliting function
Rate semiconductor valve, on-state power semiconductor valve and current-limited power semiconductor valve are equipped with concatenated valve arm, and each valve arm is by M
IGBT is directly composed in series, M >=2:
Each IGBT is parallel with pressure buffer circuit, and each IGBT is connected with the door for having IGBT voltage detecting circuit
Pole driving unit GDU, all gate-drive unit GDU are connected with online detection and control device, and online detection and control device is to gate pole
Driving unit GDU issues 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 also used to detect the electric current of current limliting branch, on-state branch
Electric current and mechanical switch it is whether abnormal.
It is preferred that pressure buffer circuit includes concatenated diode D and capacitor C, concatenated resistance R1 and R2, the one of resistance R1
End be connected respectively with the collector of the anode of diode D, IGBT, the other end of resistance R1 respectively with resistance R2, diode D bear
Extremely it is connected, the cathode of diode D is connected with capacitor C, the transmitting with the other end, IGBT of capacitor C respectively of the other end of resistance R2
Extremely it is connected.
Correspondingly, a kind of online test method of high voltage DC breaker, includes the following steps:
Step 1, all IGBT for opening current limliting branch upper flow power semiconductor valve；
Step 2, all IGBT for turning off on-state branch road on-state power semiconductor valve；
Step 3, delay time Ty, judge whether on-state branch current is 0, if 0, then enters step 4；
Step 4 judges whether current limliting branch current is operating current, if so, entering step 5；
Step 5 judges whether the collection emitter voltage VCE of the on-state branch each IGBT in road is greater than setting reference value VREF0If
It is no, then judge that the corresponding IGBT of on-state branch is abnormal；If so, entering step 6；
Whether normal step 6, shutdown mechanical switch, judge mechanical switch nodes of locations, if it is not, then judging that on-state branch is different
Often；If so, entering step 7；
Step 7, initialization: N=1 is enabled, the lower limit value VREF of reference value is set1With the upper limit value VREF of reference value2；
Step 8, cut-off current-limiting branch road IGBTN, other concatenated IGBT still keep opening state, by T1After time, inspection
Survey IGBTNCollection emitter voltage VCENIf VREF1≤VCEN≤VREF2, then judge IGBTNThere is no Damage by Short Circuit；If VCEN<
VREF1When, then judge IGBTNIt has damaged；
Step 9 judges whether the value of N is equal to the IGBT total amount of current-limited power semiconductor valve and terminates if being equal to；Otherwise,
It enables the value of N add 1 and enters step 8.
It is preferred that in step 8, cut-off current-limiting branch road IGBTN T1After duration, GDUNAgain IGBT is openedN, by T2Time,
Make IGBTNVoltage restore to normally voltage value VCESAT, GDUNBy IGBTNDetection information be back to online detection and control
Device, online detection and control device record IGBTNSpecific location and status information.
The beneficial effects of the present invention are:
Using above-mentioned detection device and method, under high voltage DC breaker operating status, on-state branch and limit can detect
Flow all concatenated IGBT in branch road.Online detection and control device records the status information and specific location of each IGBT in detail, is
Subsequent interruption maintenance provides data supporting.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of high voltage DC breaker of the present invention；
Fig. 2 is a kind of partial structure diagram of the on-line measuring device of high voltage DC breaker of the present invention；
Fig. 3 is high voltage DC breaker online detection and control device of the present invention and detection control object connection schematic diagram；
Fig. 4 is IGBT voltage detecting circuit 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 present invention；
Fig. 7 is that RCD of the present invention presses buffer circuit figure.
Specific embodiment
Technical solution of the present invention is described in further detail with specific embodiment with reference to the accompanying drawing, so that ability
The technical staff in domain can better understand the present invention and can be practiced, but illustrated embodiment is not as to limit of the 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 include simultaneously
The on-state branch and current limliting branch of connection, the on-state branch include concatenated mechanical switch and on-state power semiconductor valve, described
Current limliting branch includes current-limited power semiconductor valve, and on-state power semiconductor valve and current-limited power semiconductor valve are equipped with concatenated valve
Arm, each valve arm are directly composed in series by M IGBT, M >=2.When normal work, electric current ICOn-state branch is flowed through, in general, limit
The IGBT quantity for flowing branch is much larger than the IGBT quantity of on-state branch.
The on-line measuring device of high voltage DC breaker is including pressure buffer circuit RCD, gate-drive unit GDU and online
Controller is detected, as shown in Fig. 2, each IGBT is parallel with pressure buffer circuit, each IGBT is connected with one with IGBT electricity
The gate-drive unit GDU of detection circuit is pressed, all gate-drive unit GDU are connected with online detection and control device, for example, institute
Some gate-drive unit GDU are connected by optical-fibre channel with online detection and control device.
Online detection and control device issues control command to gate-drive unit GDU, and each gate-drive unit GDU is according to order
It controls corresponding IGBT and is switched on or off and will test information and feed back to online detection and control device.As shown in figure 3, on-line checking control
Whether device processed is also used to detect the electric current of current limliting branch, the electric current of on-state branch and mechanical switch abnormal.
As shown in fig. 7, a kind of press buffer circuit, including concatenated diode D and capacitor C, concatenated resistance R1 and R2,
One end of resistance R1 is connected with the collector of the anode of diode D, IGBT respectively, the other end of resistance R1 respectively with resistance R2,
The cathode of diode D is connected, and the cathode of diode D is connected with capacitor C, the other end of resistance R2 respectively with the other end of capacitor C,
The emitter of IGBT is connected.
Corresponding, as shown in fig. 6, a kind of online test method of high voltage DC breaker, online detection and control device is issued
Control command gives IGBT driving unit GDU, opens all IGBT of current limliting branch road, is then shut off on on-state power semiconductor valve
All IGBT, flowed through the electric current I of high voltage DC breaker on-state branch road originallyC, it is transferred to current limliting branch road.On-line checking
Controller detect on-state branch and current limliting branch road electric current, when detect on-state branch road electric current be 0, current limliting branch road
When electric current is consistent with the operating current of high voltage DC breaker, then each branch of high voltage DC breaker is detected.Specifically
Include the following steps:
Step 1, all IGBT for opening current limliting branch upper flow power semiconductor valve；
Step 2, all IGBT for turning off on-state branch road on-state power semiconductor valve；
Step 3, delay time Ty, judge whether on-state branch current is 0, if 0, then enters step 4；
Step 4 judges whether current limliting branch current is operating current, if so, entering step 5；
Step 5, due to current limliting branch IGBT quantity be much larger than on-state branch IGBT, flow through electric current I in current limliting branchC
When, at high voltage DC breaker both ends, i.e., voltage difference is generated on concatenated each IGBT on on-state power semiconductor valve, had
The collection emitter voltage of the gate-drive unit GDU detection on-state branch each IGBT in road of IGBT voltage detecting circuit, judges on-state
Whether the collection emitter voltage VCE of each IGBT in branch road is greater than setting reference value VREF0, if it is not, then judging that on-state branch is corresponding
IGBT it is abnormal；If so, judging that the IGBT is normal, then 6 are entered step；
Step 6, online detection and control device issue control command to mechanical switch, mechanical switch are turned off, by opening machinery
Whether normal the inspection of off position node judges mechanical switch nodes of locations, if it is not, then judging that on-state branch is abnormal；If so,
Enter step 7；
Step 7, initialization: N=1 is enabled, the lower limit value VREF of reference value is set1With the upper limit value VREF of reference value2；
Step 8, as shown in Figures 4 and 5, IGBT of the online detection and control device sending control command to current limliting branchNDriving is single
First GDUN, cut-off current-limiting branch road IGBTN, other concatenated IGBT still keep opening state, by T1After time, this time
Interior, IGBT detects electric current ICBy IGBTNTurn to inflow and IGBTNPressure buffer circuit in parallel makes pressure buffer circuit in T1When
Interior continuous charging, voltage are 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 IGBTNIt has damaged；
Step 9 judges whether the value of N is equal to the IGBT total amount of current-limited power semiconductor valve and terminates if being equal to；Otherwise,
It enables the value of N add 1 and enters step 8, until all current limliting branch road IGBT are detected and finished.
It is preferred that in step 8, cut-off current-limiting branch road IGBTN T1After duration, GDUNAgain IGBT is openedN, by T2Time,
Reaffirm IGBTNThe voltage at both ends, works as VCENVoltage is down to the saturation voltage drop VCE of IGBTSAT(i.e. IGBT afterwardsNVoltage restore
To normally voltage value VCESAT), it is believed that IGBTNIn opening state, GDUNBy IGBTNDetection information be back to online inspection
Controller is surveyed, online detection and control device records IGBTNSpecific location and status information.Online detection and control device is in T2After moment,
By time-delay TD(TDIt can be 0), to detect IGBT further in accordance with the method for foregoing descriptionN+1。
The status information that online detection and control device is fed 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 IGBTNThere are exceptions, as not having IGBT in status informationN's
Fault message then judges IGBTNNormally, and according to detection IGBTNMode, detect remaining IGBT one by one, record all IGBT
Detecting state information, the specific location of exception IGBT etc..
In above-mentioned steps 3, if on-state branch current is not 0, judge that on-state branch is abnormal.In step 4, if current limliting branch
Electric current is not operating current, then judges that current limliting branch is abnormal.
Using above-mentioned detection device and method, under high voltage DC breaker operating status, on-state branch and limit can detect
Flow all concatenated IGBT in branch road.Online detection and control device records the status information and specific location of each IGBT in detail, is
Subsequent interruption maintenance provides data supporting.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure made by bright specification and accompanying drawing content perhaps equivalent process transformation or be directly or indirectly used in other correlation
Technical field, be included within the scope of the present invention.
Claims (6)
1. a kind of on-line measuring device of high voltage DC breaker, the high voltage DC breaker includes on-state branch and current limliting branch
Road, the on-state branch include concatenated mechanical switch and on-state power semiconductor valve, and the current limliting branch includes current-limited power
Semiconductor valve, on-state power semiconductor valve and current-limited power semiconductor valve are equipped with concatenated valve arm, and each valve arm is by M IGBT
It is directly composed in series, M >=2, it is characterised in that:
Each IGBT is parallel with pressure buffer circuit, and each IGBT is connected with the gate pole with IGBT voltage detecting circuit and drives
Moving cell GDU, all gate-drive unit GDU are connected with online detection and control device, and online detection and control device is to gate-drive
Unit GDU issues control command, and each gate-drive unit GDU is switched on or off and will test according to the corresponding IGBT of order control
Information feeds back to online detection and control device, and online detection and control device is also used to detect the electricity of the electric current of current limliting branch, on-state branch
Whether stream and mechanical switch are abnormal；
Pressure buffer circuit includes concatenated diode D and capacitor C, concatenated resistance R1 and R2, one end of resistance R1 respectively with
The anode of diode D, the collector of IGBT are connected, and the other end of resistance R1 is connected with the cathode of resistance R2, diode D respectively,
The cathode of diode D is connected with capacitor C, and the other end of resistance R2 is connected with the emitter of the other end of capacitor C, IGBT respectively.
2. a kind of on-line measuring device of high voltage DC breaker according to claim 1, which is characterized in that all doors
Pole driving unit GDU is connected by optical-fibre channel with online detection and control device.
3. the detection method of the on-line measuring device based on high voltage DC breaker described in claim 1, which is characterized in that packet
Include following steps:
Step 1, all IGBT for opening current limliting branch upper flow power semiconductor valve；
Step 2, all IGBT for turning off on-state branch road on-state power semiconductor valve；
Step 3, delay time Ty, judge whether on-state branch current is 0, if 0, then enters step 4；
Step 4 judges whether current limliting branch current is operating current, if so, entering step 5；
Step 5 judges whether the collection emitter voltage VCE of the on-state branch each IGBT in road is greater than setting reference value VREF0, if it is not, then
Judge that the corresponding IGBT of on-state branch is abnormal；If so, entering step 6；
Whether normal step 6, shutdown mechanical switch, judge mechanical switch nodes of locations, if it is not, then judging that on-state branch is abnormal；
If so, entering step 7；
Step 7, initialization: N=1 is enabled, the lower limit value VREF of reference value is set1With the upper limit value VREF of reference value2；
Step 8, cut-off current-limiting branch road IGBTN, other concatenated IGBT still keep opening state, by T1After time, detection
IGBTNCollection emitter voltage VCENIf VREF1≤VCEN≤VREF2, then judge IGBTNThere is no Damage by Short Circuit；If VCEN< VREF1
When, then judge IGBTNIt has damaged；
Step 9 judges whether the value of N is equal to the IGBT total amount of current-limited power semiconductor valve and terminates if being equal to；Otherwise, N is enabled
Value add 1 and enter step 8.
4. the detection method of the on-line measuring device of high voltage DC breaker according to claim 3, which is characterized in that step
In rapid 8, cut-off current-limiting branch road IGBTN T1After duration, GDUNAgain IGBT is openedN, by T2Time makes IGBTNVoltage it is extensive
Again to normally voltage value VCESAT, GDUNBy IGBTNDetection information be back to online detection and control device, online detection and control
Device records IGBTNSpecific location and status information.
5. the detection method of the on-line measuring device of high voltage DC breaker according to claim 3, which is characterized in that step
In rapid 3, if on-state branch current is not 0, judge that on-state branch is abnormal.
6. the detection method of the on-line measuring device of high voltage DC breaker according to claim 3, which is characterized in that step
In rapid 4, if current limliting branch current is not operating current, judge that current limliting branch is abnormal.
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| CN201710446926.7A CN107024653B (en) | 2017-06-14 | 2017-06-14 | A kind of on-line measuring device and method of high voltage DC breaker |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109633223B (en) * | 2019-01-31 | 2024-01-30 | 深圳芯能半导体技术有限公司 | Saturation voltage drop measuring circuit of high-voltage IGBT device |
| CN111756359B (en) * | 2020-07-23 | 2023-05-19 | 天津大学 | Hybrid DC circuit breaker with multichannel gating function |
| CN113991602B (en) * | 2021-10-19 | 2023-03-24 | 南京航空航天大学 | Parameter design method for soft turn-off driving circuit of solid-state direct-current circuit breaker |
| CN115166495A (en) * | 2022-06-13 | 2022-10-11 | 国网北京市电力公司 | Fault detection method and device of direct current circuit breaker |
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