CN108226728A - A kind of device and method for monitoring transverter and dc bus dielectric level on-line - Google Patents
A kind of device and method for monitoring transverter and dc bus dielectric level on-line Download PDFInfo
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- CN108226728A CN108226728A CN201810091541.8A CN201810091541A CN108226728A CN 108226728 A CN108226728 A CN 108226728A CN 201810091541 A CN201810091541 A CN 201810091541A CN 108226728 A CN108226728 A CN 108226728A
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- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
The present invention provides a kind of device for monitoring transverter and dc bus dielectric level on-line, the alarm unit and detection unit being connected including central processing unit and with central processing unit；Detection unit is also connected with the positive and negative anodes of dc bus, online forward and reverse detection dc bus and the voltage of dc bus positive and negative anodes over the ground under multiple transverter current connection states；Voltage of the central processing unit according to dc bus positive and negative anodes over the ground calculates dc bus positive and negative anodes insulation resistance over the ground and is compared respectively with preset first resistor threshold value, and further exports corresponding control signal according to comparing result；Alarm unit opens alarm to judge that the dielectric level of dc bus or its transverter that is connected is exceeded according to control signal；Or the dielectric level that shutdown is alarmed to judge dc bus or its transverter that is connected is normal.Implement the present invention, dielectric level and the alarm of transverter and dc bus can be monitored on-line in time, ensure the safe and stable operation of entire UPFC.
Description
Technical field
The present invention relates to electrical equipment online supervision technical field more particularly to a kind of on-line monitoring transverter and direct current are female
The device and method of line dielectric level.
Background technology
Survey of Flexible AC Transmission System (FACTS, Flexible AC Transmission System) technology is with Power Electronic Technique
Based on, it is realized with reference to modern control technology and the fast and flexible of original AC transmission system parameter and network structure is controlled, energy
Power network line conveying capacity, enhancing system flexibility is enough substantially improved, has become the important development direction of power grid construction.
THE UPFC (UPFC, Unified Power Flow Controller) is that versatility is most so far
Good FACTS devices, only by the change of control law, are able to or realize shunt compensation, series compensation and phase shift simultaneously
Etc. several different functions.UPFC can be regarded as static synchronous compensator (STATCOM, Static a Synchronous
Compensator) with static synchronous series compensator (SSSC, static series a synchronous
Compensator it) is formed in DC side parallel, it can be simultaneously and quickly active in independent control transmission line of electricity
Power and reactive power, so that UPFC possesses the four quadrant running function that STATCOM, SSSC do not have.UPFC is one
Determine to represent the development trend of Survey of Flexible AC Transmission System Technology in degree, especially while power network safety operation is ensured, greatly
Amplitude improves the utilization ratio of power network resources, overcomes the bottleneck of power transmission and distribution, and that realizes power system resource distributes aspect rationally, will
Play key effect.
In UPFC engineerings, typically by multiple transverters (such as modularization multi-level converter MMC (Modular
Multilevel Converter)) common DC bus composition, multiple transverters are connected, and pass through multiple switch by dc bus
Form flexible and changeable various combination.
However, the dielectric level of transverter and dc bus can directly affect the operational safety of UPFC.For example, direct current is female
Line breaks down (such as earth fault, interpolar failure and disconnection fault) or irregular operating mode occurs (under such as dielectric level
Drop, low-voltage or overvoltage etc.), so as to influence the safe and stable operation of entire UPFC；In another example transverter breaks down (such as
Ground connection, short circuit, exchange are scurried into), failure can travel to dc bus and other transverters, so as to influence the safety of entire UPFC
Stable operation.
Therefore, it in order to avoid the generation of the above situation, needs to monitor the insulation water of transverter and dc bus on-line in time
It is flat.
Invention content
Technical problem to be solved of the embodiment of the present invention is, provides a kind of on-line monitoring transverter and dc bus is exhausted
The device and method of edge level can monitor dielectric level and the alarm of transverter and dc bus on-line in time, ensure entire
The safe and stable operation of UPFC.
In order to solve the above-mentioned technical problem, an embodiment of the present invention provides a kind of on-line monitoring transverter and dc bus are exhausted
The device of edge level is used for the THE UPFC that multiple transverter common DC bus are formed；During described device includes
Central Processing Unit and the alarm unit being connected with the central processing unit and detection unit；Wherein,
Positive and negative anodes of the detection unit also with the dc bus are connected, female for online forward and reverse detection direct current
The dc bus anode is over the ground and cathode voltage over the ground under line and the multiple transverter current connection state；Wherein, institute
The connection status for stating dc bus and the multiple transverter is in breaking including the dc bus with the multiple transverter
The state that the state opened and the dc bus are on one among the multiple transverter；
The central processing unit, for the dc bus according to the forward and reverse detection of the detection unit with it is described more
The dc bus anode over the ground and cathode voltage over the ground, calculates the dc bus under a transverter current connection state
With dc bus anode described under the multiple transverter current connection state over the ground and cathode insulation resistance over the ground and with it is pre-
If first resistor threshold value compared respectively, and further according to comparing result, export corresponding control signal；
The alarm unit for the corresponding control signal exported according to the central processing unit, opens alarm to sentence
It is exceeded to determine the dielectric level of the dc bus or its transverter that is connected under current connection state；Or shutdown alarm is current to judge
The dielectric level of the dc bus or its transverter that is connected is normal under connection status.
Wherein, the detection unit include first resistor, second resistance, first voltage mutual inductor, second voltage mutual inductor,
First switch and second switch；Wherein,
The first resistor and the first switch form positive test branch, the second resistance and the second switch
Form negative testing branch；Wherein, the open and-shut mode of the first switch and the second switch is different；
One end of the positive test branch is connected and is grounded with one end of the negative testing branch, and the positive survey
The other end of examination branch is connected with one end of the dc bus anode and the first voltage mutual inductor, the negative testing branch
The other end on road is connected with one end of the dc bus cathode and the second voltage mutual inductor；
The other end of the other end of the first voltage mutual inductor and the second voltage mutual inductor with the centre
Reason unit is connected.
Wherein, the alarm unit is formed by relay and alarm lamp or is formed by relay and buzzer.
Wherein, described device further includes tripping control unit, one end of the tripping control unit and the central processing
Unit is connected, and the other end is connected with the multiple transverter, and the dc bus is calculated for the central processing unit
With dc bus anode described under the multiple transverter current connection state over the ground and cathode insulation resistance over the ground is more than pre-
If second resistance threshold value when, identify the transverter that is connected with the dc bus under current connection state and control tripping.
Wherein, the preset first resistor threshold value 1K Ω, the preset second resistance threshold value 10K Ω.
The embodiment of the present invention additionally provides a kind of method for monitoring transverter and dc bus dielectric level on-line, aforementioned
Device on realize, the method includes：
Pass through the online forward and reverse detection dc bus of detection unit and the direct current under multiple transverter current connection states
Busbar anode is over the ground and cathode voltage over the ground；Wherein, the connection status of the dc bus and the multiple transverter includes
The dc bus is in the state disconnected and the dc bus and the multiple transverter with the multiple transverter
Among the state that is on of one；
Central processing unit is according to the forward and reverse dc bus detected of the detection unit and the multiple change of current
Under device current connection state the dc bus anode over the ground and cathode voltage over the ground, calculate the dc bus with it is described
The dc bus anode is over the ground and cathode insulation resistance over the ground and with preset under multiple transverter current connection states
One resistance threshold is compared respectively, and further exports corresponding control signal according to comparing result；
Alarm unit opens alarm to judge that the direct current is female under current connection state according to corresponding control signal
The dielectric level of line or its transverter that is connected is exceeded；Shutdown alarm come judge under current connection state the dc bus or its
The dielectric level of connected transverter is normal.
Wherein, it is described by under the online forward and reverse detection dc bus of detection unit and multiple transverter current connection states
The dc bus anode is over the ground and the step of cathode voltage over the ground specifically includes：
Be closed positive test branch in first switch and disconnect the second switch in negative testing branch, pass through first electricity
Mutual inductor and second voltage mutual inductor are pressed, obtains the positive detection dc bus and the multiple transverter current connection state
Under the dc bus anode over the ground and cathode voltage over the ground；
The first switch in positive test branch and the second switch being closed in negative testing branch are disconnected, passes through the first electricity
Mutual inductor and second voltage mutual inductor are pressed, obtains dc bus described in inverse detection and the multiple transverter current connection state
Under the dc bus anode over the ground and cathode voltage over the ground.
Wherein, it is described to calculate the dc bus and the dc bus under the multiple transverter current connection state
Anode is over the ground and cathode insulation resistance over the ground is realized respectively by the following formula：
In formula (1) and formula (2), R+It is the dc bus anode to ground resistance, R-It is electric over the ground for the dc bus cathode
Resistance, U1a+The dc bus anode voltage-to-ground, U are detected for forward direction1a-It is electric over the ground that the dc bus cathode is detected for forward direction
Pressure, U1b+For dc bus anode voltage-to-ground, U described in inverse detection1b-It is electric over the ground for dc bus cathode described in inverse detection
Pressure.
Wherein, the method further includes：
Treat that the central processing unit calculates the dc bus and institute under the multiple transverter current connection state
Dc bus anode is stated over the ground and when cathode insulation resistance over the ground is more than preset second resistance threshold value, it is single to pass through control of tripping
Member identifies the transverter being connected under current connection state with the dc bus and controls tripping.
Wherein, the preset first resistor threshold value 1K Ω, the preset second resistance threshold value 10K Ω.
Implement the embodiment of the present invention, have the advantages that：
In embodiments of the present invention, the state disconnected is in multiple transverters by online forward and reverse detection dc bus
And among dc bus and multiple transverters in a state that one is on dc bus anode over the ground and cathode over the ground
Voltage, and according to dc bus anode over the ground and cathode voltage over the ground calculates anode over the ground and cathode resistance over the ground,
And further compared and by alarm judge dc bus or its be connected transverter dielectric level it is whether exceeded, so as to
Dielectric level and the alarm of transverter and dc bus can be monitored on-line in time, ensure the safe and stable operation of entire UPFC.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, according to
These attached drawings obtain other attached drawings and still fall within scope of the invention.
Fig. 1 is a kind of knot of device for monitoring transverter and dc bus dielectric level on-line provided in an embodiment of the present invention
Structure schematic diagram；
Fig. 2 is the structure diagram of detection unit in Fig. 1；
Fig. 3 is the equivalent circuit diagram that detection unit is connected with dc bus in Fig. 2；
Fig. 4 is the method for another on-line monitoring transverter that the embodiment of the present invention three provides and dc bus dielectric level
Flow chart.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.
As shown in Figure 1, in the embodiment of the present invention, a kind of on-line monitoring transverter and dc bus dielectric level that provide
Device, be used for the THE UPFC that multiple transverter common DC bus are formed；The device includes central processing list
Member 2 and the alarm unit 3 being connected with central processing unit 2 and detection unit 1；Wherein,
Detection unit 1 is also connected with the positive and negative anodes of dc bus, is changed for online forward and reverse detection dc bus with multiple
Flow under device current connection state dc bus anode over the ground and cathode voltage over the ground；Wherein, dc bus and multiple transverters
Connection status include dc bus and multiple transverters be in the state disconnected and dc bus and multiple transverters it
The state that middle one is on；
Central processing unit 2, for currently being connected with multiple transverters according to the dc bus of 1 forward and reverse detection of detection unit
It connects dc bus anode under state over the ground and cathode voltage over the ground, calculates dc bus and currently connect shape with multiple transverters
Dc bus anode cathode insulation resistance over the ground and is compared over the ground and respectively with preset first resistor threshold value under state, and
Further according to comparing result, corresponding control signal is exported；
Alarm unit 3, for the corresponding control signal exported according to central processing unit 2, it is current to judge to open alarm
The dielectric level of dc bus or its transverter that is connected is exceeded under connection status；Or shutdown alarms to judge under current connection state
The dielectric level of dc bus or its transverter that is connected is normal.
It is understood that alarm unit 3 is formed by relay and alarm lamp or is formed by relay and buzzer, therefore
It can be by light or sound come identification device alarm condition.
Further, as shown in Fig. 2, detection unit 1 includes first resistor R1, second resistance R2, first voltage mutual inductance
Device L1, second voltage mutual inductor L2, first switch S1 and second switch S2；Wherein,
First resistor R1 and first switch S1 forms positive test branch, and second resistance R2 and second switch S2 is formed reversely
Test branch；Wherein, the open and-shut mode of first switch S1 and second switch S2 are different；
One end of positive test branch is connected and is grounded with one end of negative testing branch, and positive test branch is another
End is connected with one end of dc bus anode and first voltage mutual inductor L1, and the other end and the dc bus of negative testing branch are born
Pole and one end of second voltage mutual inductor L2 are connected；
The other end of first voltage mutual inductor L1 and the other end of second voltage mutual inductor L2 with 2 phase of central processing unit
Even.
Fig. 2 can be from which further followed that the equivalent circuit diagram of detection unit 1 shown in Fig. 3 and dc bus, the equivalent circuit
Operation principle be：
R+Dc bus anode is equivalent to ground resistance, R-Dc bus cathode is equivalent to ground resistance, U1 is a certain change of current
Device exports the voltage to dc bus；
By being closed first switch S1, second switch S2 is disconnected, forward direction measures dc bus anode voltage-to-ground U1a+And
Cathode voltage-to-ground U1a-, according to fig. 3
By disconnecting first switch S1, it is closed second switch S2, reverse measuremenet dc bus anode line-to-earth voltage U1b+With
And cathode voltage-to-ground U1b-, according to fig. 3
By both the above simultaneous equations, gained formula below (1) and (2) calculate dc bus positive and negative anodes to ground resistance：
It should be noted that control the on or off state of transverter and dc bus by transformation, can realize pair
The calculating of each transverter and dc bus dielectric level (i.e. dc bus positive and negative anodes are to ground resistance), so as to by central processing
Unit 2 to judge whether transverter and dc bus dielectric level are exceeded by alarm.
If transverter is exceeded serious with dc bus dielectric level, transverter can be controlled to trip by device,
So as to protect the safe and stable operation of entire UPFC, therefore device further includes tripping control unit, and the one of the tripping control unit
End is connected with central processing unit 2, and the other end is connected with multiple transverters, and direct current mother is calculated for central processing unit 2
Dc bus anode is over the ground under line and multiple transverter current connection states and cathode insulation resistance over the ground is more than preset the
During two resistance thresholds, identify the transverter being connected under current connection state with dc bus and control tripping.
In embodiments of the present invention, using first resistor threshold preset for 1K Ω as insulation protection limit value, by second resistance
Threshold preset is 10K Ω as trip protection limit value, according to above-mentioned two limit value, by the first resistor R1 of detection unit 1 and the
Two resistance R2 are set as 20K Ω and meet actual demand.
As shown in figure 4, in the embodiment of the present invention, a kind of on-line monitoring transverter and dc bus dielectric level that provide
Method, aforementioned device realizes on (as depicted in figs. 1 and 2), the method includes：
Step S1, pass through the online forward and reverse detection dc bus of detection unit and institute under multiple transverter current connection states
State dc bus anode over the ground and cathode voltage over the ground；Wherein, the connection shape of the dc bus and the multiple transverter
State include the dc bus and the multiple transverter be in disconnection state and the dc bus with it is the multiple
The state that one is among transverter；
Detailed process is, the first switch being closed in positive test branch and what is disconnected in negative testing branch second open
It closes, by first voltage mutual inductor and second voltage mutual inductor, obtains the positive detection dc bus and the multiple change of current
The dc bus anode is over the ground and cathode voltage over the ground under device current connection state；
The first switch in positive test branch and the second switch being closed in negative testing branch are disconnected, passes through the first electricity
Mutual inductor and second voltage mutual inductor are pressed, obtains dc bus described in inverse detection and the multiple transverter current connection state
Under the dc bus anode over the ground and cathode voltage over the ground.
Step S2, central processing unit according to the forward and reverse dc bus detected of the detection unit with it is described more
The dc bus anode over the ground and cathode voltage over the ground, calculates the dc bus under a transverter current connection state
With dc bus anode described under the multiple transverter current connection state over the ground and cathode insulation resistance over the ground and with it is pre-
If first resistor threshold value compared respectively, and further according to comparing result, export corresponding control signal；
Detailed process is, by formula below (1) and (2), calculates dc bus anode to ground resistance and cathode over the ground
Resistance：
In formula (1) and formula (2), R+It is the dc bus anode to ground resistance, R-It is electric over the ground for the dc bus cathode
Resistance, U1a+The dc bus anode voltage-to-ground, U are detected for forward direction1a-It is electric over the ground that the dc bus cathode is detected for forward direction
Pressure, U1b+For dc bus anode voltage-to-ground, U described in inverse detection1b-It is electric over the ground for dc bus cathode described in inverse detection
Pressure.
Continue the dc bus anode that will be calculated to ground resistance and cathode to ground resistance and preset first resistor threshold
Value is compared respectively, if any be more than first resistor threshold value to ground resistance, exports first control signal so that alarm is single
Member can alarm；It is on the contrary then export second control signal so that alarm unit restores normal.
Step S3, alarm unit opens alarm to judge institute under current connection state according to corresponding control signal
The dielectric level for stating dc bus or its transverter that is connected is exceeded；Or shutdown alarms to judge the direct current under current connection state
The dielectric level of busbar or its transverter that is connected is normal.
Detailed process is that alarm unit judges described straight under current connection state according to first control signal unlatching alarm
The dielectric level for flowing busbar or its transverter that is connected is exceeded, conversely, turning off alarm according to second control signal to judge currently to connect
It is normal to connect the dielectric level of the dc bus or its transverter that is connected under state.
Further, in order to avoid transverter and the exceeded safety for seriously affecting entire UPFC of dc bus dielectric level
Stable operation then can control transverter to trip by device, therefore the method further includes：
Treat that the central processing unit calculates the dc bus and institute under the multiple transverter current connection state
Dc bus anode is stated over the ground and when cathode insulation resistance over the ground is more than preset second resistance threshold value, it is single to pass through control of tripping
Member identifies the transverter being connected under current connection state with the dc bus and controls tripping.
In embodiments of the present invention, using first resistor threshold preset for 1K Ω as insulation protection limit value, by second resistance
Threshold preset is 10K Ω as trip protection limit value.
Implement the embodiment of the present invention, have the advantages that：
In embodiments of the present invention, the state disconnected is in multiple transverters by online forward and reverse detection dc bus
And among dc bus and multiple transverters in a state that one is on dc bus anode over the ground and cathode over the ground
Voltage, and according to dc bus anode over the ground and cathode voltage over the ground calculates anode over the ground and cathode resistance over the ground,
And further compared and by alarm judge dc bus or its be connected transverter dielectric level it is whether exceeded, so as to
Dielectric level and the alarm of transverter and dc bus can be monitored on-line in time, ensure the safe and stable operation of entire UPFC.
One of ordinary skill in the art will appreciate that all or part of the steps of the method in the foregoing embodiments are can be with
Relevant hardware is instructed to complete by program, the program can be stored in a computer read/write memory medium,
The storage medium, such as ROM/RAM, disk, CD.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent variations made according to the claims of the present invention, is still within the scope of the present invention.
Claims (10)
1. a kind of device for monitoring transverter and dc bus dielectric level on-line, which is characterized in that it is used for multiple transverters
In the THE UPFC that common DC bus is formed；Described device include central processing unit and with the central processing
The connected alarm unit of unit and detection unit；Wherein,
Positive and negative anodes of the detection unit also with the dc bus are connected, for online forward and reverse detection dc bus with
The dc bus anode is over the ground and cathode voltage over the ground under the multiple transverter current connection state；Wherein, it is described straight
The connection status of stream busbar and the multiple transverter includes the dc bus and is in what is disconnected with the multiple transverter
The state that state and the dc bus are on one among the multiple transverter；
The central processing unit, for being changed according to the dc bus of the forward and reverse detection of the detection unit with the multiple
It flows under device current connection state the dc bus anode over the ground and cathode voltage over the ground, calculates the dc bus and institute
State the dc bus anode under multiple transverter current connection states over the ground and cathode insulation resistance over the ground and with it is preset
First resistor threshold value is compared respectively, and further exports corresponding control signal according to comparing result；
The alarm unit for the corresponding control signal exported according to the central processing unit, opens alarm to judge to work as
The dielectric level of the dc bus or its transverter that is connected is exceeded under preceding connection status；Or shutdown alarms to judge currently to connect
The dielectric level of the dc bus or its transverter that is connected is normal under state.
2. device as described in claim 1, which is characterized in that the detection unit includes first resistor, second resistance, first
Voltage transformer, second voltage mutual inductor, first switch and second switch；Wherein,
The first resistor and the first switch form positive test branch, and the second resistance is formed with the second switch
Negative testing branch；Wherein, the open and-shut mode of the first switch and the second switch is different；
One end of the positive test branch is connected and is grounded with one end of the negative testing branch, and the positive test branch
The other end on road is connected with one end of the dc bus anode and the first voltage mutual inductor, the negative testing branch
The other end is connected with one end of the dc bus cathode and the second voltage mutual inductor；
The other end of the other end of the first voltage mutual inductor and the second voltage mutual inductor with the central processing list
Member is connected.
3. device as claimed in claim 2, which is characterized in that the alarm unit formed by relay and alarm lamp or by after
Electric appliance and buzzer are formed.
4. device as claimed in claim 3, which is characterized in that described device further includes tripping control unit, the tripping control
One end of unit processed is connected with the central processing unit, and the other end is connected with the multiple transverter, for the center
Processing unit calculates under the dc bus and the multiple transverter current connection state the dc bus anode over the ground
And the insulation resistance of cathode over the ground be more than preset second resistance threshold value when, identify current connection state under with the dc bus
Connected transverter simultaneously controls tripping.
5. device as claimed in claim 4, which is characterized in that the preset first resistor threshold value 1K Ω, it is described preset
Second resistance threshold value 10K Ω.
A kind of 6. method for monitoring transverter and dc bus dielectric level on-line, which is characterized in that it is in such as claim 5 institute
It is realized on the device stated, the method includes：
Pass through the online forward and reverse detection dc bus of detection unit and the dc bus under multiple transverter current connection states
Anode is over the ground and cathode voltage over the ground；Wherein, the connection status of the dc bus and the multiple transverter includes described
Dc bus is in the multiple transverter among the state disconnected and the dc bus and the multiple transverter
The state that one is on；
Central processing unit is worked as according to the forward and reverse dc bus detected of the detection unit and the multiple transverter
Under preceding connection status the dc bus anode over the ground and cathode voltage over the ground, calculate the dc bus with it is the multiple
Under transverter current connection state the dc bus anode over the ground and cathode insulation resistance over the ground and with the preset first electricity
Resistance threshold value is compared respectively, and further exports corresponding control signal according to comparing result；
Alarm unit according to corresponding control signal, open alarm judge under current connection state the dc bus or
The dielectric level of its transverter that is connected is exceeded；Shutdown alarm come judge under current connection state the dc bus or its be connected
The dielectric level of transverter is normal.
7. method as claimed in claim 6, which is characterized in that described to pass through detection unit forward and reverse detection dc bus online
With dc bus anode described under multiple transverter current connection states over the ground and the step of cathode voltage over the ground specifically includes：
Be closed positive test branch in first switch and disconnect the second switch in negative testing branch, it is mutual by first voltage
Sensor and second voltage mutual inductor obtain the positive detection dc bus and institute under the multiple transverter current connection state
State dc bus anode over the ground and cathode voltage over the ground；
The first switch in positive test branch and the second switch being closed in negative testing branch are disconnected, it is mutual by first voltage
Sensor and second voltage mutual inductor obtain dc bus described in inverse detection and institute under the multiple transverter current connection state
State dc bus anode over the ground and cathode voltage over the ground.
8. the method for claim 7, which is characterized in that described to calculate the dc bus and the multiple transverter
The dc bus anode is over the ground under current connection state and cathode insulation resistance over the ground is realized respectively by the following formula：
In formula (1) and formula (2), R+It is the dc bus anode to ground resistance, R-It is the dc bus cathode to ground resistance,
U1a+The dc bus anode voltage-to-ground, U are detected for forward direction1a-The dc bus cathode voltage-to-ground is detected for forward direction,
U1b+For dc bus anode voltage-to-ground, U described in inverse detection1b-For dc bus cathode voltage-to-ground described in inverse detection.
9. method as claimed in claim 8, which is characterized in that the method further includes：
It is described straight under the dc bus and the multiple transverter current connection state to treat that the central processing unit calculates
Busbar anode is flowed over the ground and when cathode insulation resistance over the ground is more than preset second resistance threshold value, is passed through the control unit that trips and is known
The transverter that is connected under other current connection state with the dc bus simultaneously controls tripping.
10. method as claimed in claim 9, which is characterized in that the preset first resistor threshold value 1K Ω, it is described preset
Second resistance threshold value 10K Ω.
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| CN201810091541.8A CN108226728A (en) | 2018-01-30 | 2018-01-30 | A kind of device and method for monitoring transverter and dc bus dielectric level on-line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470990A (en) * | 2018-10-25 | 2019-03-15 | 南京南瑞继保电气有限公司 | A kind of route variable quantity fault direction judgment method and device adapting to UPFC access |
| CN112924829A (en) * | 2021-02-26 | 2021-06-08 | 科世达(上海)智能设备有限公司 | Insulation detection device |
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| CN109470990B (en) * | 2018-10-25 | 2020-12-18 | 南京南瑞继保电气有限公司 | Line variation fault direction judgment method and device suitable for UPFC access |
| CN112924829A (en) * | 2021-02-26 | 2021-06-08 | 科世达(上海)智能设备有限公司 | Insulation detection device |
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