CN106655746A - Buffer circuit suitable for hybrid high-voltage DC breaker bidirectional parallel load commutation switch - Google Patents
Buffer circuit suitable for hybrid high-voltage DC breaker bidirectional parallel load commutation switch Download PDFInfo
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- CN106655746A CN106655746A CN201610917462.9A CN201610917462A CN106655746A CN 106655746 A CN106655746 A CN 106655746A CN 201610917462 A CN201610917462 A CN 201610917462A CN 106655746 A CN106655746 A CN 106655746A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/344—Active dissipative snubbers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention brings forward a buffer circuit structure suitable for a hybrid high-voltage DC breaker bidirectional parallel load commutation switch, and a control policy. The circuit structure comprises capacitors C1p and C1n, insulation gate bipolar transistors T1p and T1n, diodes D1p to D3n and resistors R1p to R2n, wherein the collector electrode and the emitter electrode of the T1p are connected with the cathode and the anode of the D1p; one end of the R1p is connected with the emitter electrode of the T1p, and the other end is connected with a node S2; one end of the C1p is connected with the collector electrode of the T1p, and the other end is connected with the node S2; the R2p and the D2p are connected in parallel; the anode and the cathode of the D2p are connected with the cathode of the D3p and the collector electrode of T1p; the anode of the D3p is connected with a node S1; and another same buffer circuit structure is reversely connected in series between the node S1 and the node S2. The control policy of the circuit comprises control over the T1p and the T1n when a hybrid high-voltage DC breaker is disconnected and connected. The structure and control are simple, and the quick acting property and reliability of the hybrid high-voltage DC breaker are improved.
Description
Technical field
The present invention relates to a kind of be applied to the two-way shunt load commutation switch (load of hybrid high voltage DC breaker
Commutation switch, LCS) buffer circuit, belong to high-voltage dc transmission electrical domain.
Background technology
Flexible DC power transmission (voltage source converter based high based on Power Electronic Technique
Voltage direct current, VSC-HVDC) with its Power Control flexibly, without mutual in bulk power grid the advantages of commutation failure
Achieved with flourishing in terms of connection, point-to-point power transmission, while flexible DC power transmission is also randomness stronger solar energy, wind
Energy etc. develops swift and violent new-energy grid-connected and dissolves there is provided solution.Key of the high voltage DC breaker as direct current transportation
One of technology, while being also direct current network operation, control, the basis of protection.Hybrid high voltage DC breaker because it has can
By property it is high, be swift in motion, low feature be lost, the most practicality in high-voltage direct current.
The structure of hybrid high voltage DC breaker is varied, but its current-carrying branch road is generally by LCS and supper-fast machinery
Switch (ultrafast disconnector, UFD) is composed in series.LCS is used as the normal current-carrying of hybrid high voltage DC breaker
With the key element of the failure change of current, its structure can be divided into the two types such as two-way series and two-way parallel connection.Two-way LCS knots in parallel
Structure can reduce the on-state loss of hybrid high voltage DC breaker compared to the LCS structures of two-way series.Therefore the present invention is based on
The two-way LCS structures in parallel of hybrid high voltage DC breaker launch discussed further.
In Practical Project, hybrid high voltage DC breaker closes a floodgate, and should first close UFD mechanical contacts, before making LCS conductings
There is certain forward voltage drop, to ensure that LCS can triggered as normal conducting；Hybrid high voltage DC breaker separating brake, should first trigger LCS
Cut-off, to ensure that solid-state main switch (main breaker, MB) can triggered as normal conducting.This can all cause the IGBT in LCS to hold
By very big voltage change ratio, therefore LCS two ends must configure the buffer circuit for reducing voltage change ratio, to ensure that LCS is normal
Work.
At present the buffer circuit of LCS mainly has RCD (resistance, electric capacity, diode) buffer circuits and the improvement based on RCD slow
Rush circuit.RCD circuit structures are simple, but during hybrid high voltage DC breaker separating brake, current-carrying Zhi Luxiang solid-state masters open
When closing the branch road change of current, buffering electric capacity meeting Jing UFD electric discharges cause UFD breaking currents to increase, and UFD contact disengaging times are elongated, reduce
The quick-action of hybrid high voltage DC breaker；Based on the improvement buffer circuit of RCD, putting for buffering electric capacity Jing UFD is eliminated
Electric branch road, but after causing hybrid high voltage DC breaker separating brake to terminate, residual voltage is higher on buffering electric capacity, reduces mixed
The reliability of multiple divide-shut brake action is carried out in the box-like high voltage DC breaker short time.Therefore, for two-way LCS in parallel, need
Study the more excellent buffer circuit of performance.
The content of the invention
For the problems referred to above, the present invention proposes a kind of suitable for the slow of the two-way LCS in parallel of hybrid high voltage DC breaker
Circuit is rushed, it passes through diode D3p, the D3n being connected between buffering electric capacity and UFD, has blocked buffering electric capacity C1p, C1n Jing
UFD discharges, and improves the quick-action of breaker；By insulated gate bipolar transistor T1p, T1n respectively with small resistor R1p, R1n
It is connected, is to buffer the parallel discharge branch road that electric capacity C1p, C1n define resistance controllable variations, reduces hybrid HVDC and break
Residual voltage on electric capacity is buffered after the device separating brake release of road, the reliability of breaker short time multiple action is improve.
The technical solution used in the present invention is：A kind of delaying suitable for the two-way LCS in parallel of hybrid high voltage DC breaker
Circuit is rushed, its architectural feature is, including the forward and reverse current buffering module of two structure identicals, it is connected in nodes X 1, X2
Between.The buffer module of one of sense of current, including：Buffering electric capacity C1p, insulated gate bipolar transistor T1p, diode
D1p, D2p, D3p, resistance R1p, R2p.Colelctor electrode, the emitter stage of T1p negative electrode respectively with D1p, anode are connected；One end of R1p
It is connected with the emitter stage of T1p, the other end is connected with nodes X 2；One end of C1p is connected with the colelctor electrode of T1p, the other end with and section
Point X2 is connected；R2p is in parallel with D2p；Anode, the negative electrode of D2p negative electrode respectively with D3p, the colelctor electrode of T1 are connected；The anode of D3p
It is connected with nodes X 1.
The control strategy of the buffer circuit is included in the control plan of T1p, T1n when hybrid high voltage DC breaker closes a floodgate
Slightly, the control strategy of T1p, T1n and in hybrid high voltage DC breaker separating brake.Close a floodgate in hybrid dc circuit breaker
When, keep T1p, T1n to be constantly in the state of cut-offfing；During hybrid dc circuit breaker separating brake, the original state of T1p, T1n is to open
Disconnected, the Continuity signal of T1p, T1n separates that signal is synchronous with the contact of UFD, T1p, T1n cut-off signal and MB to cut-off signal same
Step.
Of the invention the characteristics of and advantage are：
Diode D3p, D3n are connected between buffering electric capacity and UFD, have blocked buffering electric capacity C1p, C1n Jing UFD electric discharges,
Improve the quick-action of hybrid high voltage DC breaker；Insulated gate bipolar transistor T1p, T1n respectively with small resistor R1p,
R1n is connected, and is to buffer the parallel discharge branch road that electric capacity C1p, C1n define resistance controllable variations, reduces hybrid high straightening
Residual voltage on electric capacity is buffered after stream breaker open operation release, improve the hybrid high voltage DC breaker short time is carried out
The reliability of multiple divide-shut brake action；The control of insulated gate bipolar transistor T1p, T1n and hybrid high voltage DC breaker
The control of middle UFD, MB combines, and buffer circuit control strategy is simply easily realized.
Description of the drawings
Fig. 1 is a kind of buffer circuit structure figure suitable for the two-way LCS in parallel of hybrid high voltage DC breaker of the present invention.
Fig. 2 is control strategy flow chart of the present invention in hybrid high voltage DC breaker separating brake.
Fig. 3 is the equivalent circuit using the hybrid high voltage DC breaker of the present invention when closing a floodgate.
Fig. 4 is the equivalent circuit using the hybrid high voltage DC breaker of the present invention in separating brake
Fig. 5 is a certain case history of the hybrid high voltage DC breaker using the present invention
Fig. 6 is to adopt the hybrid high voltage DC breaker of the invention UFD current curves in single separating brake.
Fig. 7 is that electric capacity and LCS are buffered in short time multiple action using the hybrid high voltage DC breaker of the present invention
Voltage curve.
Specific embodiment
Technical scheme is further described with reference to the accompanying drawings and examples.It is important to point out that this
Embodiment is served only for being further described the present invention, it is impossible to be interpreted as limiting the scope of the invention, the field
Person skilled in the art can make some nonessential modifications and adaptations according to the content of foregoing invention.
A kind of structure suitable for the two-way LCS buffer circuits in parallel of hybrid high voltage DC breaker proposed by the present invention,
As shown in Figure 1.The current capacity two-way to ensure hybrid high voltage DC breaker division, the present invention includes that two structures are identical
Forward and reverse current buffering module, be connected between nodes X 1, X2.The buffer module of one of sense of current, including：It is slow
Rush electric capacity C1p, insulated gate bipolar transistor T1p, diode D1p, D2p, D3p, resistance R1p, R2p.The colelctor electrode of T1p, send out
Emitter-base bandgap grading negative electrode respectively with D1p, anode are connected；One end of R1p is connected with the emitter stage of T1p, and the other end is connected with nodes X 2；
One end of C1p is connected with the colelctor electrode of T1p, the other end with and nodes X 2 be connected；R2p is in parallel with D2p；The anode of D2p, negative electrode point
The colelctor electrode of negative electrode, T1 not with D3p is connected；The anode of D3p is connected with nodes X 1.
The present invention proposes a kind of control plan suitable for the two-way LCS buffer circuits in parallel of hybrid high voltage DC breaker
Slightly, the control strategy of T1p, T1n when hybrid high voltage DC breaker closes a floodgate is included in, and in the open circuit of hybrid HVDC
The control strategy of T1p, T1n during device separating brake.When hybrid high voltage DC breaker closes a floodgate, only T1p, T1n need to be kept to locate always
In the state of cut-offfing.And in hybrid high voltage DC breaker separating brake, the original state of T1p, T1n is to cut-off, T1p, T1n
Continuity signal separate that signal is synchronous with the contact of UFD, T1p, T1n cut-off signal and MB to cut-off signal synchronous, control plan
Slightly flow chart is as shown in Figure 3.It should be noted that starting to separating brake to terminate from separating brake, hybrid high voltage DC breaker is completed once
Separating brake action.To be all the existing control circuit institute of hybrid high voltage DC breaker required for all of decision logic in figure, therefore T1p,
The control of T1n only need to be slightly modified to the existing control circuit of hybrid high voltage DC breaker.
During electric current forward and reverse because of hybrid high voltage DC breaker division, forward and reverse buffer current module operation principle phase
Together.Therefore only its operation principle is analyzed by taking one direction current buffering module as an example.
When hybrid high voltage DC breaker closes a floodgate, equivalent circuit is as shown in Figure 3.Its breaker in middle S1, S2 represent respectively LCS
With UFD, inductance Ls represents the current-limiting reactor of hybrid high voltage DC breaker, and Udc and Rl represents respectively dc source and straight
Stream load.
Assume buffering electric capacity C1p without initial voltage.In t0=0s moment, switch S2 closures, dc circuit breaker feed motion
Start, then t0～t1 periods, can obtain circuit equation is：
In formula：vC0For t0～t1 period electric capacity C1p voltages；i0Inductance L is flowed through for t0～t1 periodsSElectric current.
In t1 moment, switch S1 closures, dc circuit breaker completes feed motion, then after the t1 moment, for buffer circuit,
Circuit equation can be obtained is：
In formula：vC1For electric capacity C1p voltages after the t1 moment.
During hybrid high voltage DC breaker separating brake, equivalent circuit is as shown in Figure 4.Wherein S1, S2, Ls, Udc, Rl and conjunction
Identical during lock, switch S3 represents MB, and inductance Lm represents the stray inductance of UFD and MB, and Rm represents the resistance of MB, switch S and resistance
Rf represents earth fault.
Buffering electric capacity C1p is assumed without initial voltage, before the t0=0s moment, long-time is closed for switch S1, S2.In t0
Suddenly there is earth fault (switching S to close at the t0 moment) in=0s moment, system, can obtain circuit equation is：
In formula：i0The electric current of inductance Ls is flowed through for t0～t1 periods.
At the t1 moment, protection act, dc circuit breaker starts separating brake action, and switch S1 disconnects.Then t1～t2 periods, can obtain
Circuit equation is：
In formula：i1The electric current of inductance Ls is flowed through for t1～t2 periods；vC1For t1～t2 period electric capacity C1p voltages.
At the t2 moment, switch S3 closures, fault current is shifted by current-carrying Zhi Luxiang MB branch roads.Then t2～t3 periods, can obtain
Circuit equation is：
In formula：i2The electric current of inductance Ls is flowed through for t2～t3 periods；i21The electric current of inductance Ls is flowed through for t2～t3 periods；vC2
For t2～t3 period electric capacity C1p voltages.
At the t3 moment, current-carrying branch current is reduced to zero, and switch S2 begins breaking, T1p closures, then after the t3 moment, for
Buffer circuit, can obtain circuit equation is：
In formula：vC2For electric capacity C after the t3 momentSVoltage.
Embodiment：
Below so that the hybrid high voltage DC breaker using the present invention is applied to simple straight system as an example, this is illustrated
Bright specific embodiment.The straight-flow system of one simple 320kV/2kA is as shown in figure 5, in parallel with two-way to illustrate the invention
The concrete annexation of LCS, only depicts in detail the concrete structure of two-way LCS in parallel in figure, to the open circuit of hybrid HVDC
Remaining element is simplified in device.Assume that hybrid high voltage DC breaker is closed a floodgate at the 0.02s moment, system after combined floodgate
Normal operation；During 0.1s there is permanent DC Line Fault in etching system, and hybrid high voltage DC breaker is detected after DC Line Fault
Separating brake is carried out, after failure removal 0.06s, hybrid primary cut-out closes a floodgate again, detect direct current event after closing success again
Barrier, hybrid high voltage DC breaker also needs to carry out second separating brake.
In this example, the parameter of buffer circuit such as following table.
During hybrid high voltage DC breaker single separating brake, the electric current of UFD is as shown in Figure 6.As seen from the figure, using the present invention
Hybrid high voltage DC breaker because of the presence of diode D1, D2, blocked the discharge paths of buffering electric capacity C1 Jing UFD,
In commutation course, UFD electric currents are just almost unanimously maintained at zero after being reduced to zero, it is ensured that the Zero current disjunction of UFD, improve mixed
The quick-action of box-like high voltage DC breaker.
During the multiple action of hybrid high voltage DC breaker short time, voltage curve such as Fig. 7 institutes of electric capacity and LCS are buffered
Show.Should first illustrate, in breaker separating brake twice, the initial voltage that electric capacity is buffered in two kinds of buffer circuits is all zero, therefore LCS
The voltage at two ends is all change of starting from scratch, as long as reasonably selecting the size of buffering electric capacity, just the IGBT in LCS can be played
Preferable buffer protection function.In breaker reclosing, the present invention by the control to T1p, T1n and parallel resistance R1p,
The reasonable selection of R1n resistances, buffers electric capacity and has just discharged completely before first disjunction is completed in breaker, therefore in reclosing
When, the voltage on LCS is also started from scratch change, it is ensured that the reliability of the multiple action of breaker.
Claims (10)
1. it is a kind of to be applied to two-way shunt load commutation switch (the load commutation of hybrid high voltage DC breaker
Switch, LCS) buffer circuit, it is characterised in that include：Buffering electric capacity C1p, insulated gate bipolar transistor T1p, two poles
Pipe D1p, D2p, D3p, resistance R1p, R2p.Colelctor electrode, the emitter stage of T1p negative electrode respectively with D1p, anode are connected；The one of R1p
End is connected with the emitter stage of T1p, and the other end is connected with node S2；One end of C1p is connected with the colelctor electrode of T1p, the other end with section
Point S2 is connected；R2p is in parallel with D2p；Anode, the negative electrode of D2p negative electrode respectively with D3p, the colelctor electrode of T1p are connected；The anode of D3p
It is connected with node S1.The branch road that wherein T1p, D1p, R1p are constituted is referred to as positive parallel connection controlled discharge branch road.
2. buffer circuit according to claim 1, it is characterised in that when hybrid high voltage DC breaker closes a floodgate：
1) T1p is constantly in the state of cut-offfing, and positive parallel connection controlled discharge branch road is in big resistance；
2) after the contact closure of supper-fast mechanical switch (ultrafast disconnector, UFD), C1p passes through diode
D3p, D2p charge；
3) after LCS conductings, C1p is discharged by resistance R2p and LCS.
3. buffer circuit according to claim 1, it is characterised in that during hybrid high voltage DC breaker separating brake：
1) before LCS cut-offs, in state of cut-offfing, positive parallel connection controlled discharge branch road is in big resistance to T1p；
2) after LCS cut-offs, C1p is charged by diode D3p, D2p；
3) when UFD contacts are initially separated, T1p conductings, positive parallel connection controlled discharge branch road is in little resistance, while diode D3p
The electric discharge of blocking C1p Jing UFD, C1p is by positive parallel connection controlled discharge branch road electric discharge；
4) after solid-state main switch (main breaker, MB) cut-offs, T1p cut-offs, and positive parallel connection controlled discharge branch road is in big resistance
Value.
4. a kind of buffer circuit suitable for the two-way LCS in parallel of hybrid high voltage DC breaker, it is characterised in that include：It is slow
Rush electric capacity C1n, insulated gate bipolar transistor T1n, diode D1n, D2n, D3n, resistance R1n, R2n.The colelctor electrode of T1n, send out
Emitter-base bandgap grading negative electrode respectively with D1n, anode are connected；One end of R1n is connected with the emitter stage of T1n, the anode phase of the other end and D3n
Even；One end of C1n is connected with the colelctor electrode of T1n, the anode of the other end and D3n；R2n is in parallel with D2n；The anode of D2n, negative electrode point
It is not connected with the colelctor electrode of node S2, T1；The negative electrode of D3n is connected with S1.The branch road that wherein T1n, D1n, R1n are constituted is referred to as reverse
Controlled discharge branch road in parallel.
5. buffer circuit according to claim 4, it is characterised in that when hybrid high voltage DC breaker closes a floodgate：
1) T1n is constantly in the state of cut-offfing, and reverse parallel connection controlled discharge branch road is in big resistance；
2) after UFD mechanical contacts closure, C1n is charged by diode D3n, D2n；
3) after LCS conductings, C1n is discharged by resistance R2n and LCS.
6. buffer circuit according to claim 4, it is characterised in that during hybrid high voltage DC breaker separating brake：
1) before LCS cut-offs, in state of cut-offfing, reverse parallel connection controlled discharge branch road is in big resistance to T1n；
2) after LCS cut-offs, C1n is charged by diode D3n, D2n；
3) when UFD contacts are initially separated, T1n conductings, reverse parallel connection controlled discharge branch road is in little resistance, while diode D3n
The electric discharge of blocking C1n Jing UFD, C1n is discharged by reverse parallel connection controlled discharge branch road；
4) after MB cut-offs, T1n cut-offs, and reverse parallel connection controlled discharge branch road is in big resistance.
7. a kind of buffer circuit suitable for the two-way LCS in parallel of hybrid high voltage DC breaker, including positive buffer circuit and
Reverse buffer circuit, it is characterised in that described positive buffer circuit is included described in claim 1-3 any one, described
Reversely buffer circuit includes that two buffer modules are connected between node S1, S2 described in claim 4-6 any one.When
DC current direction from S1 flow to S2 when, positive buffer circuit works；When direct current direction flows to S1 from S2, reversely buffering is electric
Work on road.So that being applied to the DC network of the two-way change of electric current using the mixed DC breaker of this technology.
8. a kind of buffer circuit suitable for the two-way LCS in parallel of hybrid high voltage DC breaker, its control strategy is characterised by,
When hybrid dc circuit breaker closes a floodgate, any Trig control signal is not sent to T1p, T1n, keep its state to cut-off.
9. a kind of buffer circuit suitable for the two-way LCS in parallel of hybrid high voltage DC breaker, its control strategy is characterised by,
During hybrid dc circuit breaker separating brake, to cut-off, the Continuity signal of T1p, T1n and the contact of UFD divide the original state of T1p, T1n
From signal synchronization, T1p, T1n cut-off signal and MB to cut-off signal synchronous, it is desirable to protect control strategy as shown in Figure 2.
10. a kind of buffer circuit suitable for the two-way LCS in parallel of hybrid high voltage DC breaker, its control strategy feature exists
In, including the control strategy when hybrid high voltage DC breaker closes a floodgate described in claim 8, and claim 9 institute
The control strategy in hybrid high voltage DC breaker separating brake stated, and the control strategy is used in positive buffer circuit simultaneously
With reverse buffer circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610917462.9A CN106655746B (en) | 2016-10-21 | 2016-10-21 | A kind of buffer circuit suitable for the two-way shunt load commutation switch of hybrid high voltage DC breaker |
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| CN201610917462.9A CN106655746B (en) | 2016-10-21 | 2016-10-21 | A kind of buffer circuit suitable for the two-way shunt load commutation switch of hybrid high voltage DC breaker |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107819460A (en) * | 2017-10-25 | 2018-03-20 | 清华大学 | A kind of composite switch based on coupling negative pressure circuit |
| CN107846211A (en) * | 2017-10-25 | 2018-03-27 | 清华大学 | The composite switch of primary path inline solid state switch |
| CN107896101A (en) * | 2017-10-25 | 2018-04-10 | 清华大学 | A kind of composite switch based on coupling negative pressure circuit |
| CN109687386A (en) * | 2019-02-02 | 2019-04-26 | 四川大学 | Hybrid dc circuit breaker with reclosing ability buffers branch |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107819460A (en) * | 2017-10-25 | 2018-03-20 | 清华大学 | A kind of composite switch based on coupling negative pressure circuit |
| CN107846211A (en) * | 2017-10-25 | 2018-03-27 | 清华大学 | The composite switch of primary path inline solid state switch |
| CN107896101A (en) * | 2017-10-25 | 2018-04-10 | 清华大学 | A kind of composite switch based on coupling negative pressure circuit |
| CN109687386A (en) * | 2019-02-02 | 2019-04-26 | 四川大学 | Hybrid dc circuit breaker with reclosing ability buffers branch |
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| Publication number | Publication date |
|---|---|
| CN106655746B (en) | 2019-12-03 |
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