CN104218593B - A kind of serial connection capacitor compensating device for power distribution network - Google Patents
A kind of serial connection capacitor compensating device for power distribution network Download PDFInfo
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- CN104218593B CN104218593B CN201410500288.9A CN201410500288A CN104218593B CN 104218593 B CN104218593 B CN 104218593B CN 201410500288 A CN201410500288 A CN 201410500288A CN 104218593 B CN104218593 B CN 104218593B
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- 229910044991 metal oxide Inorganic materials 0.000 description 10
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The present invention provides a kind of serial connection capacitor compensating devices for power distribution network, described device includes the series capacitor group being connect with bypass breaker both ends by disconnecting switch of connecting, earthing switch is connected between the series connection disconnecting switch and the series capacitor group, the series capacitor group is in parallel with concatenated thyristor and damping unit.The serial connection capacitor compensating device is suitable for power distribution network, and main circuit structure is more simplified, reliability higher, and the main circuit structure ensures serial connection capacitor compensating device breakdown maintenance itself and do not cause the power failure of place circuit when replacing.
Description
Technical field
It is in particular to a kind of for power distribution network the present invention relates to a kind of device of series capacitor compensation technical field
Serial connection capacitor compensating device.
Background technology
Serial connection capacitor compensating device is that capacitor group is series in transmission line of alternation current, for compensating AC power line
The part emotional resistance on road, to reach the purpose of increasing the transmission capacity of circuit, the stability for improving system, investment reduction.
In remote, large capacity transmission system, with the increase of transmission distance, the conveying capacity of transmission line of electricity is by more and more
Limitation.Serial connection capacitor compensating device is to solve the problems, such as this, improves one of the important means of transmission line of electricity conveying capacity, has
Very huge economic value, is widely applied in the electric system of countries in the world.
Before the 1980s, most of fixed series capacitors compensation device does not have metal oxide pressure-limiting device, only
The overvoltage of series capacitor group is limited with spark gap.It, only can shadow with the main circuit structure of spark gap when external area error
Quickly throwing again for series capacitor group is rung, this is very unfavorable to the transient stability for improving system.
Since the 1980s, metal oxide pressure-limiting device is introduced, series capacitor group when solving external area error
The problem of quickly throwing again.Super-pressure, system for ultra-high voltage transmission fixed series capacitors compensation device typical main circuit structure such as
Shown in Fig. 1, including bypass isolating switch 10, series connection disconnecting switch 2, earthing switch 3, series capacitor group 4, metal oxide limit
Depressor 11, damping unit 6, spark gap 12, bypass breaker 1, wherein series connection disconnecting switch 2 and earthing switch 3 have interlocking
Relationship.
Serial connection capacitor compensating device is used in power distribution network, is mainly used for the perceptual pressure drop of compensated line, improves voltage
Quality.Such as, the radius of electricity supply of 10kV is usually no more than 15 kilometers usually within 10 kilometers.The modular design of substation should be able to
Ensure that the supply line that most of loads can meet above-mentioned requirements, but also have individual 10kV sometimes can be more than 15 kilometers.It is right
In the 10kV distribution line generally existing voltage problems more than 15 kilometers, voltage matter can be improved with serial connection capacitor compensating device
Amount.
Requirement of the power distribution network to reliability, flexibility etc. is not so good as super-pressure, extra-high voltage grid, but to the economy of equipment
Property and compactedness require higher, more lay particular emphasis on and solve the problems, such as that power distribution network exists with economical and effective scheme.Although such as Fig. 1
Shown in super-pressure, system for ultra-high voltage transmission fixed series capacitors compensation device typical main circuit structure can not repair
The characteristics of changing, being applied directly in the lower power distribution network of voltage class, but do not make full use of and adapt to power distribution network.According to
Power grid is studied for small etc. the requirement of low cost, floor space and proposes to be suitable for power distribution network, consolidating of more simplifying
Where fixed string mends main circuit structure, and the main circuit structure should ensure that string is mended equipment breakdown maintenance itself and should not be caused when replacing
The power failure of circuit is need to solve the problems, such as now.
Accordingly, it is desirable to provide a kind of new serial connection capacitor compensating device for power distribution network.
Invention content
To overcome above-mentioned the deficiencies in the prior art, the present invention to provide a kind of series capacitor compensation dress for power distribution network
It sets.
Solution is used by realizing above-mentioned purpose：
A kind of serial connection capacitor compensating device for power distribution network thes improvement is that：Described device includes with series connection
The series capacitor group that disconnecting switch is connect with bypass breaker both ends, the series connection disconnecting switch and the series capacitor group
Between connect earthing switch, the series capacitor group is in parallel with concatenated thyristor and damping unit.
Further, the thyristor is anti-parallel thyristor or bidirectional thyristor；The thyristor is used from cooling side
Formula.
Further, the anti-parallel thyristor and the bidirectional thyristor use compression joint type thyristor or welded type crystalline substance lock
Pipe.
Further, series capacitor group side connects the earthing switch or both sides are separately connected the ground connection and open
It closes.
Further, there are mechanical interlocked relationships for the series connection disconnecting switch and the earthing switch；
When the earthing switch closes a floodgate, the series connection disconnecting switch cannot close a floodgate；
When the grounding switch tripping, the operable series connection disconnecting switch of；
Only in the case of the series connection disconnecting switch separating brake, the earthing switch could close a floodgate.
Further, with the earthing switch there are the disconnecting switch of connecting of mechanical interlocked relationship, rear operation is another for first operation
One series connection disconnecting switch.
Further, the enter line side of the serial connection capacitor compensating device installs current transformer, the series capacitor
Group shunt capacitance voltage measurement circuit.
Further, the capacitance voltage measuring loop is voltage transformer or resitstance voltage divider.
Further, the serial connection capacitor compensating device configures arrester.
Further, the plan of establishment of the arrester includes following situations：
A, the arrester is mounted on enter line side and outgoing line side；
B, in enter line side or outgoing line side configuration arrester and series capacitor group lightning arrester connected in parallel；
If C, the configured arrester of enter line side power transmission line, and the arrester meets the serial connection capacitor compensating device limitation
Enter line side arrester is then omitted in the requirement of lightning surge；
If D, the configured arrester of outgoing line side power transmission line, and the arrester meets the serial connection capacitor compensating device limitation
Outgoing line side arrester is then omitted in the requirement of lightning surge.
Further, when the bypass breaker separating brake, the thyristor is latched, when the series connection disconnecting switch is closed a floodgate,
The serial connection capacitor compensating device is input state；
When the bypass breaker closes a floodgate, thyristor locking, when the series connection disconnecting switch separating brake, the series electrical
Container compensation device is to exit state.
Further, the input state and the state that exits carry out the shape that the state of part cooperation is converted or coordinated entirely
State is converted.
Further, the input shape is transformed by the state that exits in the mode of the state conversion of the part cooperation
The method of state is：It is closed the series connection disconnecting switch, disconnects the bypass breaker；
The method for exiting state is transformed by the input state in the mode of the state conversion of the part cooperation
For：It is sequentially completed the conducting thyristor, is closed the bypass breaker, is latched the thyristor, disconnects the series connection isolation
Switch.
Further, by the method for exiting state and being transformed into the input state in the state conversion coordinated entirely
For：It is closed series connection disconnecting switch and ensures, in position is closed, to send the trigger signal of the thyristor；Disconnect the bypass breaker
And delay scheduled time ensures line current from the bypass breaker change of current to the thyristor；It is latched touching for the thyristor
It signals；
Being transformed into the method for exiting state by the input state in the state conversion coordinated entirely is：Conducting institute
Thyristor is stated, the bypass breaker is closed, is latched the thyristor, disconnects the series connection disconnecting switch.
Further, the damping unit is damping reactor of the quality factor less than 30 or damped resistor and damping electricity
The circuit of anti-device parallel connection.
Further, judge that short trouble occurs for power distribution network by the current transformer measured value of enter line side, make
Turn on thyristors and bypass breaker close a floodgate, and the turn on thyristors protects series capacitor, the bypass breaker it is subsequent
Closing protective thyristor.
Further, pass through the measurement of the measured value of current transformer described in enter line side and the capacitance voltage measuring loop
Value determines the capacitance of the series capacitor group, and judges the series capacitance by the variation of the series capacitor group capacitance
The damaged condition of capacitor unit in device group.
Further, when the serial connection capacitor compensating device is input state, the series capacitor group voltage is surveyed
When magnitude and the ratio of capacitance voltage value corresponding to line current measured value are less than or equal to 90%, then judge that short circuit occurs for thyristor
Damage.
Further, the serial connection capacitor compensating device is transformed into the process for exiting state by the input state
In, have in the 20-100ms times, if the electricity of the capacitance voltage value corresponding to line current measured value and the series capacitor group
Press measured value unequal, then it is assumed that turn on thyristors works, i.e., open circuit breakage does not occur for thyristor；
If the capacitance voltage value corresponding to line current measured value is equal with the voltage measuring value of series capacitor group,
Then judge that thyristor does not turn on, i.e., open circuit breakage occurs for thyristor.
Compared with prior art, the invention has the advantages that：
1, thyristor is used in device provided by the invention, compared with prior art the relatively large metal oxide of middle volume
It is more compact using self cooled thyristor for voltage limiter, be conducive to the rational deployment of device, reduce floor space.
2, use thyristor, the thyristor that can believe by the way that optical fiber is corresponding with controller progress in device provided by the invention
Breath exchange, it is easier to detect, and in the prior art use metal oxide pressure-limiting device damage, then need more complicated instrument and
Mode is checked.
3, when individual thyristors damage in the thyristor valve in the present apparatus, the thyristor of damage, cost are only replaced
It is low, it is easy to maintain；And individual valves are only replaced after individual valve block damages in the metal oxide pressure-limiting device used in the prior art
Therefore piece, is typically only capable to replace entire metal oxide pressure-limiting device, cost phase it is difficult to obtain consistent nonlinear wind vibration
To higher.
4, thyristor protection actuation time detects that turn on thyristors is not more than 100us, response speed substantially from control system
Degree is very fast, close to the response speed of metal oxide pressure-limiting device.
5, it can ensure that replacing capacitor, thyristor etc. sets in device provided by the invention using thyristor and bypass breaker
Circuit where when standby does not have a power failure.
6, the subset that device provided by the invention uses is less, under the premise of reducing a whole set of string benefit cost, wiring
It is greatly simplified, therefore improve the reliability of whole device.
7, the thyristor that self-cooled is used in device provided by the invention, only has several seconds cooling time, can quickly weigh
New input series capacitor, and the cooling time of metal oxide pressure-limiting device needs three to four hours, needs to wait for a few houres
After could put into series capacitor again, be affected to system.
It 8, being capable of maximum limit using the switching of self cooled thyristor cooperation bypass breaker in device provided by the invention
Degree ground reduces the arcing of bypass breaker, shortens the arcing duration, and to reduce the abrasion of bypass breaker, it is disconnected to extend bypass
The service intervals time of road device.
9, it is measured using the capacitance of series capacitor group in device provided by the invention, realization exists to series capacitor group
Line monitoring function detects the capacitance variation of series capacitor group in real time, convenient for the various failures of anticipation series capacitor group, and
The schedule ahead of plan is replaced in repair.
10, the present invention utilizes the correspondence of capacitance voltage measured value and line current measured value in unit state transfer process
Relationship, judges whether thyristor occurs open circuit breakage or Damage by Short Circuit.
Description of the drawings
Fig. 1 is the typical main circuit structure schematic diagram of fixed series compensation；
Fig. 2 is the main circuit structure schematic diagram of the serial connection capacitor compensating device for power distribution network in the present invention；
Fig. 3 is the application main circuit schematic diagram of serial connection capacitor compensating device in the present embodiment；
Reference numeral：1- bypass breakers, 2- series connection disconnecting switch, 3- earthing switches, 4- series capacitor groups, 5- crystalline substance locks
Pipe, 6- damping units, 7- voltage transformers and capacitor discharge circuit, 8- arresters, 9- current transformers, 10- bypass isolation
Switch, 11- metal oxide pressure-limiting devices, 12- spark gaps.
Specific implementation mode
The specific implementation mode of the present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in Fig. 2, Fig. 2 is the main circuit structure signal of the serial connection capacitor compensating device for power distribution network in the present invention
Figure, the present invention provides a kind of serial connection capacitor compensating device, which includes：Bypass breaker 1, disconnecting switch 2 of connecting, connects
Ground switch 3, series capacitor group 4, thyristor 5, damping unit 6.
Series capacitor group 4 is connect by disconnecting switch 2 of connecting with the both ends of bypass breaker 1, and the series connection is kept apart
It closes and connects earthing switch 3 between 2 and the series capacitor group 4, thyristor 5 and damping unit 6 are connected, concatenated thyristor 5
It is in parallel with the series capacitor group 4 with damping unit 6.
4 side of series capacitor group connects earthing switch 3 or both sides are separately connected the earthing switch 3.
The series connection disconnecting switch 2 and the earthing switch 3 specifically include following situations there are mechanical interlocked relationship：
When the earthing switch 3 closes a floodgate, the series connection disconnecting switch 2 cannot close a floodgate；
When 3 separating brake of earthing switch, the just operable series connection disconnecting switch 2；
Only in the case of series connection 2 separating brake of disconnecting switch, the earthing switch 3 could close a floodgate.
There are the disconnecting switch of connecting of mechanical interlocked relationship with the earthing switch for priority service, operate another string afterwards
Join disconnecting switch.
Bypass breaker 1 uses air-break or air switch, need to meet following requirements：
1, the corresponding load current of circuit where power distribution network should be able to be cut-off；
2, the corresponding short circuit current of circuit where power distribution network should be able to be born；
3, there should be the corresponding short circuit current making capability of circuit where power distribution network；
4, the connecting-disconnecting function of the corresponding short circuit current of circuit where can not having power distribution network.
Since the line-breaker of place circuit is responsible for cut-offfing short circuit current, bypass breaker 1 can not have short circuit current
Connecting-disconnecting function.
Thyristor 5 uses anti-parallel thyristor or bidirectional thyristor.Anti-parallel thyristor uses compression joint type thyristor or weldering
Connect formula thyristor；Bidirectional thyristor uses compression joint type thyristor or welded type thyristor.
Thyristor 5 damages Analysis of Countermeasure：Thyristor damage is commonly divided into two states, and one is short-circuit conditions, compression joint type
It is typically short-circuit when thyristor damages；Second is that open circuit situation is typically opened a way when welded type thyristor damages.
Serial connection capacitor compensating device provided by the invention includes two states：Input state and exit state.
When the bypass breaker separating brake, the thyristor is latched, when the series connection disconnecting switch is closed a floodgate, the series electrical
Container compensation device is input state.
When the bypass breaker closes a floodgate, thyristor locking, when the series connection disconnecting switch separating brake, the series electrical
Container compensation device is to exit state.
It the input state of serial connection capacitor compensating device provided by the invention and exits the strategy that state is converted and includes：
The state conversion of part cooperation or the state conversion coordinated entirely.
The state of part cooperation, which is converted, includes：
It is by exiting the method that state is transformed into input state：It closes a floodgate the series connection disconnecting switch, bypass described in separating brake is disconnected
Road device；
The method for being transformed into the state of exiting by input state is：The thyristor is first connected, close a floodgate the bypass breaker,
It is latched the thyristor again, disconnecting switch of connecting described in separating brake.
The state coordinated entirely is converted：
It is by exiting the method that state is transformed into input state：Series connection disconnecting switch closes a floodgate and ensures, in position is closed, to send
The trigger signal of the thyristor, then simultaneously delay scheduled time ensures line current from the bypass to bypass breaker described in separating brake
The breaker change of current is to the thyristor, then is latched the trigger signal of the thyristor；
The method for being transformed into the state of exiting by input state is：The thyristor is first connected, close a floodgate the bypass breaker,
It is latched the thyristor again, disconnecting switch of connecting described in separating brake.
In above two switching strategy, thyristor 5 is served only for the state conversion of auxiliary serial connection capacitor compensating device, brilliant
The time of 5 constant conduction of brake tube is shorter, and therefore, self cooled radiating mode can be used in thyristor 5, with the side such as water cooling, air-cooled
Formula is compared using relatively easy reliable from cooling.
1 separating brake of bypass breaker, line current flow through serial connection capacitor compensating device, and such as series capacitor group 4 is still at this time
It is shorted, then can determine whether that thyristor 5 generates Damage by Short Circuit.
When serial connection capacitor compensating device is input state, the voltage measuring value of series capacitor group is significantly less than circuit
Voltage value corresponding to current measurement value, then judging may thyristor generation Damage by Short Circuit.
It should be noted that：1, it is right to be significantly less than line current measured value institute for the voltage measuring value of above-mentioned series capacitor group
The voltage value answered refers to other than error range；Such as：Set voltage measuring value the line is busy the road current measurement value of series capacitor group
Corresponding voltage value ratio is less than or equal to 90%, then judges that Damage by Short Circuit occurs for thyristor.Specific error range can be according to reality
Depending on the situation of border.
For example, the capacitance voltage value corresponding to line current measured value is 100V, the voltage measuring value of series capacitor group
For 98V, then the error of 2V, it is believed that thyristor fault-free；If the voltage measuring value of series capacitor group is 70V, hence it is evident that be less than line
Capacitance voltage value corresponding to the current measurement value of road, it is believed that Damage by Short Circuit occurs for thyristor, is judging thyristor generation short circuit damage
Combined use environment etc. is needed to be further examined thyristor after bad.
2, it is one of fault condition that Damage by Short Circuit, which occurs, for thyristor, it is also possible to other failures, therefore, in practical application
In, need combined use environment etc. to be further examined thyristor after judging that Damage by Short Circuit occurs for thyristor.
Serial connection capacitor compensating device is transformed by input state and is exited in state procedure, has a bit of time (such as：1 to 3
Between a frequency cycle, i.e. between 20-60ms) in, if corresponding line current measured value does not obtain series capacitor group electricity
Capacitance voltage corresponding to appearance capacitance, but the capacitance voltage of smaller (such as less than 100V) then can determine whether out that thyristor 5 is connected
It works, open circuit breakage does not occur；If corresponding line current measured value obtains corresponding to series capacitor group capacitor's capacity
Capacitance voltage, rather than the capacitance voltage of smaller (such as less than 100V) then can determine whether out that thyristor 5 is not turned on, and can
Can be that open circuit breakage occurs.
It should be noted that：1, above-mentioned corresponding capacitance voltage value is in error range；If that is, line current measured value phase
The capacitance voltage answered accounts for the capacitance voltage ratio corresponding to series capacitor group capacitor's capacity and is less than or equal to 95%, then it is assumed that circuit
Capacitance voltage corresponding to electric current is smaller capacitance voltage.Specific error range can be depending on actual conditions.
Such as：Ideal corresponding capacitance voltage is 10V, and the capacitance voltage measured is 9.8V, then it also hold that 9.8V
Voltage be correct capacitance voltage value.
2, above-mentioned generation open circuit breakage is one kind of fault condition, it is also possible to other failures, therefore, in practical application
In, after judging that Damage by Short Circuit occurs for thyristor, environment etc. need to be used in combination, thyristor is further examined.
Damping unit uses damping reactor of the quality factor less than 30 or uses damped resistor and damping reactor simultaneously
The circuit of connection.
In another embodiment, serial connection capacitor compensating device configures arrester；The enter line side of serial connection capacitor compensating device
Current transformer, the series capacitor group shunt capacitance voltage measurement circuit are installed.
Capacitance voltage measuring loop uses voltage transformer or resitstance voltage divider.Voltage transformer and resitstance voltage divider all may be used
To also serve as capacitor set discharge circuit, for this angle, the two is identical.In view of voltage transformer also has electricity
Gas buffer action, and resitstance voltage divider is acted on without electrical isolation, therefore, under normal circumstances, it should preferred voltage mutual inductor
Scheme.
Above-mentioned lightning rod is installed as follows；
1, an arrester is respectively configured in enter line side and outgoing line side；
2, an arrester is configured in connection side or outgoing line side, increases the arrester of one and series capacitor group parallel connection；
3, configured arrester such as near enter line side power transmission line, and the arrester disclosure satisfy that serial connection capacitor compensating device
The requirement for limiting lightning surge, then can omit enter line side arrester.
4, configured arrester such as near outgoing line side power transmission line, and the arrester disclosure satisfy that serial connection capacitor compensating device
The requirement for limiting lightning surge, then can omit outgoing line side arrester.
As shown in figure 3, Fig. 3 is the application main circuit structure schematic diagram of serial connection capacitor compensating device in the present embodiment；This
In embodiment, select voltage transformer as capacitance voltage measuring loop.Serial connection capacitor compensating device configure arrester, into
Line side and outgoing line side respectively configure an arrester.The enter line side of serial connection capacitor compensating device installs current transformer.
In the present embodiment, also it can be further added by one under the premise of the side of enter line side or outgoing line side configures an arrester
Arrester a and that series capacitor group 4 is in parallel.If configured arrester near the power transmission line of enter line side, and by calculating school
After core, which disclosure satisfy that the requirement of limitation lightning surge, then the arrester 8 of enter line side can omit in Fig. 3.If outlet
Configured arrester near the power transmission line of side, and after calculating and checking, which disclosure satisfy that limitation lightning surge
Requirement, then the arrester 8 of outgoing line side can omit in Fig. 3.
Current transformer 9 is used to measure the electric current for flowing into serial connection capacitor compensating device, is various controls and Preservation tactics
Realization corresponding input quantity is provided.
By the current transformer measured value of enter line side judge power distribution network occur short trouble, order turn on thyristors and
Bypass breaker closes a floodgate, and the fast conducting of thyristor can protect series capacitor, the subsequent combined floodgate of bypass breaker that can protect
Protect thyristor.
Using the measurement result of current transformer 9 and voltage transformer 7, the capacitance that can estimate series capacitor group 4 holds
Value, and the operating status of assessment series capacitor group 4 can be gone according to the variation of 4 capacitance of series capacitor group, that is, pass through series electrical
The variation of container group capacitance judges the damaged condition of capacitor unit in the series capacitor group.
Include the capacitor unit of several series connection or/and parallel connection in series capacitor group, capacitor unit includes multiple
Capacitor element, damaged condition indicate that the capacitor element damaged in capacitor unit accounts for the total parts number of series capacitor group
Percentage.
For example, a capacitor unit includes 100 capacitor elements, if one capacitor element of damage, then it is assumed that damage
Bad degree is 1 percent, if damage ten, then it is assumed that damaged condition is 10.
Finally it should be noted that:Above example is merely to illustrate the technical solution of the application rather than to its protection domain
Limitation, although the application is described in detail with reference to above-described embodiment, those of ordinary skill in the art should
Understand:Those skilled in the art read the specific implementation mode of application can still be carried out after the application various changes, modification or
Person's equivalent replacement, but these changes, modification or equivalent replacement, are applying within pending claims.
Claims (7)
1. a kind of serial connection capacitor compensating device for power distribution network, it is characterised in that；
A kind of serial connection capacitor compensating device for power distribution network, it is characterised in that：Described device includes with series connection disconnecting switch
The series capacitor group being connect with bypass breaker both ends connects between the series connection disconnecting switch and the series capacitor group
Earthing switch, the series capacitor group are in parallel with concatenated thyristor and damping unit；
The thyristor is anti-parallel thyristor or bidirectional thyristor；The thyristor is used from the type of cooling；
The anti-parallel thyristor and the bidirectional thyristor use compression joint type thyristor or welded type thyristor；
Series capacitor group side connects the earthing switch or both sides are separately connected the earthing switch；
There are mechanical interlocked relationships for the series connection disconnecting switch and the earthing switch；
When the earthing switch closes a floodgate, the series connection disconnecting switch cannot close a floodgate；
When the grounding switch tripping, the operable series connection disconnecting switch of；
Only in the case of the series connection disconnecting switch separating brake, the earthing switch could close a floodgate；
There are the disconnecting switch of connecting of mechanical interlocked relationship with the earthing switch for first operation, operate another series connection afterwards and keep apart
It closes；
The bypass breaker separating brake, the thyristor locking, when the series connection disconnecting switch is closed a floodgate, the series capacitor is mended
It is input state to repay device；
The bypass breaker closes a floodgate, the thyristor locking, when the series connection disconnecting switch separating brake, the series capacitor benefit
It is to exit state to repay device；
The input state and the state conversion for exiting state and carrying out the state conversion of part cooperation or coordinating entirely；
It is exited the method that state is transformed into the input state by described in the mode of the state conversion of part cooperation and is：It closes
The series connection disconnecting switch is closed, the bypass breaker is disconnected, is latched the thyristor, disconnects the series connection disconnecting switch；
The enter line side of the serial connection capacitor compensating device installs current transformer, the series capacitor group shunt capacitance voltage
Measuring loop；
The capacitance voltage measuring loop is voltage transformer or resitstance voltage divider；
The serial connection capacitor compensating device configures arrester；
The plan of establishment of the arrester includes following situations：
A, the arrester is mounted on enter line side and outgoing line side；
B, in enter line side or outgoing line side configuration arrester and series capacitor group lightning arrester connected in parallel；
If C, the configured arrester of enter line side power transmission line, and the arrester meets the serial connection capacitor compensating device limitation thunder and lightning
Enter line side arrester is then omitted in the requirement of overvoltage；
If D, the configured arrester of outgoing line side power transmission line, and the arrester meets the serial connection capacitor compensating device limitation thunder and lightning
Outgoing line side arrester is then omitted in the requirement of overvoltage.
2. a kind of serial connection capacitor compensating device for power distribution network as described in claim 1, it is characterised in that：It is described to match entirely
It is exited the method that state is transformed into the input state by described in the state conversion of conjunction and is：It is closed series connection disconnecting switch and ensures
In position is closed, the trigger signal of the thyristor is sent；It disconnects the bypass breaker and delay scheduled time ensures line electricity
Stream is from the bypass breaker change of current to the thyristor；It is latched the trigger signal of the thyristor；
Being transformed into the method for exiting state by the input state in the state conversion coordinated entirely is：The crystalline substance is connected
Brake tube is closed the bypass breaker, is latched the thyristor, disconnects the series connection disconnecting switch.
3. a kind of serial connection capacitor compensating device for power distribution network as described in claim 1, it is characterised in that：The damping
Device is the quality factor circuit in parallel with damping reactor less than 30 damping reactor or damped resistor.
4. a kind of serial connection capacitor compensating device for power distribution network as described in claim 1, it is characterised in that：Pass through inlet wire
The current transformer measured value of side judges that short trouble occurs for power distribution network, and turn on thyristors and bypass breaker is made to close
Lock, the turn on thyristors protect series capacitor, the subsequent closing protective thyristor of the bypass breaker.
5. a kind of serial connection capacitor compensating device for power distribution network as described in claim 1, it is characterised in that：Pass through inlet wire
The measured value of current transformer described in side and the measured value of the capacitance voltage measuring loop determine the series capacitor group
Capacitance, and judge by the variation of the series capacitor group capacitance damage journey of capacitor unit in the series capacitor group
Degree.
6. a kind of serial connection capacitor compensating device for power distribution network as described in claim 1 or 2 is any, it is characterised in that：
When the serial connection capacitor compensating device is input state, the series capacitor group voltage measuring value is measured with line current
When the ratio of the corresponding capacitance voltage value of value is less than or equal to 90%, then judge that Damage by Short Circuit occurs for thyristor.
7. a kind of serial connection capacitor compensating device for power distribution network as described in claim 1 or 2 is any, it is characterised in that：
The serial connection capacitor compensating device by the input state be transformed into it is described exit state during, have the 20-100ms times
It is interior, if the capacitance voltage value and the voltage measuring value of the series capacitor group corresponding to line current measured value are unequal,
Think that turn on thyristors works, i.e., open circuit breakage does not occur for thyristor；If the capacitance electricity corresponding to line current measured value
Pressure value is equal with the voltage measuring value of series capacitor group, then judges that thyristor does not turn on, i.e., open circuit damage occurs for thyristor
It is bad.
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| CN105811442B (en) * | 2015-09-14 | 2019-01-29 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of electrification access device of Mobile energy storage system grid connection 10kV route |
| CN105633978B (en) * | 2016-03-21 | 2017-12-05 | 重庆朗天通讯股份有限公司 | A kind of intelligent series compensation device of distribution network |
| CN107578947B (en) * | 2017-10-17 | 2019-10-25 | 国网江苏省电力公司南通供电公司 | Shunt capacitor group switching high-voltage intelligent circuit breaker |
| CN110021927A (en) * | 2018-01-09 | 2019-07-16 | 江苏南瑞泰事达电气有限公司 | A kind of the control guard method and system of power distribution network serial connection capacitor compensating device |
| CN109921432B (en) * | 2019-04-18 | 2021-01-05 | 国网陕西省电力公司电力科学研究院 | Comprehensive reactive power voltage regulation compensation device for power distribution network with tail end concentrated loads |
| CN114614455B (en) * | 2022-04-29 | 2023-10-03 | 国网陕西省电力有限公司电力科学研究院 | DC circuit breaker for multi-capacitance grading transfer current |
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| CN201805235U (en) * | 2010-09-20 | 2011-04-20 | 中电普瑞科技有限公司 | Extra/ultra-high voltage series capacitor compensating device having current transfer branch circuit |
| CN102386775B (en) * | 2011-10-19 | 2015-07-08 | 中电普瑞科技有限公司 | Control method of controllable series compensation device based on parallel connection of double TCR (Thyristor Controlled Reactor) branch circuits |
| CN102790387B (en) * | 2012-07-31 | 2015-07-22 | 许继电气股份有限公司 | Protection device and series compensation system for metal oxide varistor in series compensation |
| CN204118750U (en) * | 2014-09-26 | 2015-01-21 | 国家电网公司 | A kind of serial connection capacitor compensating device for power distribution network |
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