CN105762758A - Direct current side protection method of regeneration energy recovery system - Google Patents
Direct current side protection method of regeneration energy recovery system Download PDFInfo
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- CN105762758A CN105762758A CN201610231883.6A CN201610231883A CN105762758A CN 105762758 A CN105762758 A CN 105762758A CN 201610231883 A CN201610231883 A CN 201610231883A CN 105762758 A CN105762758 A CN 105762758A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/081—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current and depending on the direction
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/18—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to reversal of direct current
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a direct current side protection method of a regeneration energy recovery system. The method comprises the steps of: connecting a direct current switch cabinet with a direct current bus, inverting redundant direct current electric energy of the direct current bus into alternating current electric energy and feeding the alternating current electric energy back to an alternating current system for recycling; and requiring a protection device in the direct current switch cabinet to configure protection functions according to the following requirements: configuring a current quick break protection function, wherein the protected current constant value is identical with a built-in protected current constant value of the regeneration energy recovery system and a time constant value is matched with power supply incoming line protection of the direct current bus; configuring a countercurrent protection function, wherein the countercurrent protection action time should escape the longest fault clearing time of direct current bus feeder protection; and configuring an inter-tripping protection function, namely unitedly tripping an alternating current side circuit breaker of the regeneration energy recovery system when a direct current circuit breaker trips. According to the invention, the regeneration energy recovery system can be protected effectively, the existing protection functions of an underground direct current system are not disturbed, the effective cooperation relationship is formed, the fault in an area is removed reliably and the practical value is high.
Description
Technical field
The present invention relates to the DC side guard method of a kind of regenerated energy recovery system, it is adaptable to the various application needing to install energy feedback type regenerated energy recovery system such as subway, light rail.
Background technology
Fig. 1 is regenerated energy recovery system DC side protection scheme configuration figure.As it can be seen, straight-flow system includes commutation system, dc bus, DC feeder etc..Commutation system, as the power supply of straight-flow system, is changed into direct current energy, it is provided that to straight-flow system after rectified for the electric energy of ac bus process.Commutation system, DC feeder are all connected on dc bus, to realize collecting and distributing of electric energy.Newly-increased regenerated energy recovery system, as a feeder line of dc bus, accesses dc bus by dc circuit breaker.
When underground engines adopts DC source, locomotive requires over contact net and absorbs electric energy from straight-flow system and be converted into mechanical energy when accelerating, and can be electric energy feedback in traction power supply straight-flow system by changes mechanical energy again when locomotive deceleration.The namely regenerated energy of feedback energy during this deceleration.
Because following reason, regenerated energy have to be utilized effectively:
1) in metro operation process, locomotive start and stop are frequent, and reclaiming energy can save the energy in a large number, reduce running cost；
2) if regenerated energy can not reclaim, consume only by resistance heating, bring the temperature rise in subway system, increase the power consumption of air conditioning system.
3) regenerated energy can raise the voltage of dc bus, and the safety of electrical equipment and passenger is formed threat.
Therefore, increasing new subway circuit includes regenerated energy recovery system in construction option.In polytype regenerated energy recovery system, can present formula regenerated energy recovery system by the regenerative electric energy inversion of straight-flow system is feed back in ac power supply system after AC energy, have that construction cost is low, the feature of technology maturation, life cycle length, be most widely used regenerated energy recovery scheme.
Meanwhile, the problem in formula regenerated energy recovery system can bring a lot of protection cooperation when accessing existing ac and dc systems can be presented:
1) can present formula regenerated energy recovery system can be AC energy by direct current energy inversion, can be also direct current energy by AC energy rectification under given conditions simultaneously.The protection equipment of existing straight-flow system is brought very big interference by the switching of both operational modes; such as: when there is no regenerated energy recovery system; dc bus only has this single DC source of commutator; after there is DC bus fault; commutator is excised by existing direct current protecting from dc bus, and namely dc bus is in electroless state；After increasing regenerated energy recovery system, impact due to regenerated energy recovery system fly-wheel diode, built-in support capacitor and current-limiting reactor, after commutator excises from dc bus, regenerative energy system can be always maintained at the electriferous state of dc bus, maintain less fault current, follow-up maintenance and equipment are brought safely hidden danger.
2) the internal existing coordination relationship of protection of straight-flow system is complicated; regenerated energy recovery system further increases the difficulty of protection cooperation aspect after accessing; such as: the fixed value adjusting of existing protection scheme is adjusted according to not having regenerated energy system after the meeting; defencive function includes rate of change protection, current quick, mechanical trip protection, reverse current protection etc., and matching relationship is complicated.Increase after joining regenerated energy recovery system; optimal case is under not adjusting existing definite value situation; by the defencive function of the newly-increased regenerative system dc circuit breaker of reasonable disposition, can either effectively protect regenerated energy recovery system, without the existing defencive function of interference subway straight-flow system.
At present; the function ratio being concentrated mainly on all kinds of scheme about the research of regenerated energy recovery system is chosen; or (such as " in Beijing Metro No. 10 line pressure energy feedback type regenerative braking utilization of power device " in the realization of regenerated energy recovery system body equipment; modern city track traffic in January, 2005), after lesser concern system access how with the matching problem of existing protection scheme.
For above-mentioned situation; if able to propose a kind of perfect protection cooperation setting method; the defencive function commonly used in straight-flow system is passed through reasonable disposition; optimization is adjusted; under the premise not adjusting existing DC system protection definite value; realization can present coordinating of formula regenerated energy recovery system defencive function and existing DC system protection function, meets the protection demand of self of regenerated energy recovery system simultaneously, will have good Social and economic benef@.
Summary of the invention
The invention provides a kind of DC side guard method being applicable to present formula regenerated energy recovery system,
A kind of DC side guard method of regenerated energy recovery system; it is characterized in that: DC side chopper three kinds of defencive functions of configuration of described regenerated energy recovery system; jumping protection including current quick, reverse current protection and connection, described three kinds of defencive functions should coordinate with the existing protection of the built-in protection of regenerated energy recovery system and subway straight-flow system；
Described current quick is the fast tripping protection with direction locking, when the sense of current meet permissive condition and the fault current persistent period more than electric current threshold definite value more than delay time definite value time, tripping DC side chopper；
Described reverse current protection function when the sense of current meet counter-current condition and persistent period more than delay time definite value time, tripping DC side chopper；
The described deciliter state jumping defencive function monitoring dc circuit breaker, dc circuit breaker is by after tripping, and connection is jumped the AC of protection tripping regenerated energy recovery system and connected chopper.
As present invention further optimization scheme, in described current quick, direction permissive condition is that DC current flows to regenerated energy recovery system from dc bus；
Electric current threshold definite value Iset1Should be identical with the built-in protection definite value of regenerated energy recovery system, to realize the standby matching relationship with built-in protection；
Delay time definite value Tset1Formula should be metTo realize the standby matching relationship with DC source incoming relay-protection；In formula, TcbMovement time during for dc circuit breaker disjunction fault, IsetmFor the electric current threshold definite value of DC source incoming relay-protection, di/dt is the fault current rate of change in failure process, K1For coefficient of reliability and 1≤K1≤1.5。
As present invention further optimization scheme, in described reverse current protection merit, counter-current condition is that DC current flows to dc bus from regenerated energy recovery system；
Delay time definite value Tset2Formula T should be metset2≥K2×MAX(TL1…TLn)+Tcb, to realize the standby matching relationship with dc bus protection for feed line；
In formula, TLnFor the action delay of nth bar protection for feed line, MAX (TL1…TLn) for the maximum of all protection for feed line action delay times, TcbMovement time during for dc circuit breaker disjunction fault, K2For coefficient of reliability and 1≤K2≤1.5。
The DC side guard method of regenerated energy recovery system provided by the invention realizes following beneficial effects:
1, the defencive function commonly used in straight-flow system is passed through reasonable disposition; optimization is adjusted; under the premise not adjusting existing DC system protection definite value; achieve and can present coordinating of formula regenerated energy recovery system defencive function and existing DC system protection function, decrease fixed value adjusting workload when regenerated energy recovery system puts into.
2 have carried out effective cooperation with the built-in protection of regenerated energy recovery system, it is contemplated that back-up protection function when built-in protection is malfunctioning, protection scheme is more reliable.
3, configuration reverse current protection function, due to the impact of the built-in fly-wheel diode of system, support capacitor and current-limiting reactor when solving bus-bar fault, regenerated energy recovery system cannot from dc bus off-the-line, the problem that cause the long-term charging effect maintenance of dc bus.
Accompanying drawing explanation
Fig. 1 is regenerated energy recovery system DC side protection scheme configuration figure.
Detailed description of the invention
Below with reference to accompanying drawing 1, technical scheme is described in detail.
The method requires that the dc circuit breaker being connected with dc bus for regenerated energy recovery system should realize following defencive function:
(1) the current quick function with direction.
This protection specifies that the positive direction of DC current is that dc bus flows to regenerated energy recovery system, now meets direction permissive condition.For K1 and the K2 fault in Fig. 1, it is unsatisfactory for the direction condition of this protection, not in the protection domain of this protection.
The electric current threshold definite value I of this protectionset1Should be identical with the built-in protection definite value of regenerated energy recovery system, to realize the standby matching relationship with built-in protection.Built-in protection is generally current quick, and current ration is adjusted according to the ability to bear of regenerated energy recovery system equipment (such as IGBT module), and delay time is 0ms.Identical with built-in protective current threshold definite value; when there is the internal fault of regenerative system (regenerated energy recovery system); if built-in protection is because of a variety of causes tripping such as sample error, device locking; current quick with direction can be protected in support; on behalf of excision fault, ensure the safety of regenerative system.
The delay time definite value T of this protectionset1Formula should be metTo realize the standby matching relationship with DC source incoming relay-protection.Wherein, TcbMovement time (unit is millisecond) during for dc circuit breaker disjunction fault, IsetmElectric current threshold definite value (unit is ampere) for the big current-release protection (implementing in 60 choppers in Fig. 1) of dc bus electric power incoming line; di/dt is the fault current rate of change (unit is ampere/millisecond) in failure process, K1For coefficient of reliability and 1≤K1≤1.5。
Illustrate for the K3 fault in Fig. 1: after fault occurs, fault current quickly increases, arrive Iset1After definite value threshold, the current quick of 30 choppers starts, through Tset1Time tripping operation outlet, 30 choppers start to excise fault after receiving trip signal, through TcbAfter time, fault is cut.Protecting due to the big current-release of 60 choppers is without delay protection, once fault current reaches its definite value Isetm, outlet of tripping at once.In order to prevent 30 choppers excision K3 faults before 60 circuit breaker trips, Tset1Setting time must be fulfilled forAfter considering certain coefficient of reliability, formula is adjusted to
(2) reverse current protection function.
Reverse current protection specifies that the positive direction of 30 chopper DC currents is that dc bus flows to regenerated energy recovery system, meets adverse current entry condition when the current direction is reversed.The main purpose of reverse current protection is set when being prevent dc bus from breaking down, due to the metering function of regenerated energy recovery system built-in reactor, causes that regenerative system cannot excise from fault bus.
The reason arranging this protection is: should only operate in inverter mode when regenerated energy recovery system is properly functioning, and the sense of current then flowing through 30 choppers should be positive direction；When the sense of current is opposite direction, illustrate that regenerated energy recovery system is operated in rectification mode, now should start reverse current protection, to guarantee that regenerative energy system excises from dc bus.
The delay time definite value T of reverse current protectionset2Formula T should be metset2≥K2×MAX(TL1…TLn)+Tcb, to realize the standby matching relationship with dc bus protection for feed line.Wherein, TLnFor the action delay of nth bar protection for feed line, MAX (TL1…TLn) for the maximum of all protection for feed line action delay times, TcbMovement time during for dc circuit breaker disjunction fault, K2For coefficient of reliability and 1≤K2≤1.5.Illustrating for the K1 fault in Fig. 1: when coming in contact net feeder fault, the uncontrollable rectifier circuit of regenerative energy system can provide electric energy as DC source to trouble point, and the sense of current then flowing through 30 choppers should be opposite direction, and reverse current protection can start.But K1 fault is at the protection domain of 10 choppers, it should preferentially excised by 10 choppers.Therefore the delay time definite value T of reverse current protectionset2Should be greater than the delay time definite value of 10 breaker protections and T movement time of 10 chopper own excision faultscb.Dc bus generally configures a plurality of DC feeder, therefore the delay time definite value T of reverse current protectionset2Should be greater than the maximum delay time MAX (T of all protection for feed lineL1…TLn).After considering coefficient of reliability, formula is Tset2≥K2×MAX(TL1…TLn)+Tcb。
(3) defencive function jumped by connection.
This protection requires that dc circuit breaker is connected chopper by the AC of tripping regenerated energy recovery system while tripping.In Fig. 1, K3 fault illustrates: if only having the band directional current quick-break protection act excision fault of 30 choppers; after 30 chopper trippings, regenerative system is not excised completely, and the uncontrollable rectifier circuit of regenerated energy recovery system still can provide fault current as power supply to K3 trouble point.After increasing connection jumping function, the AC chopper of regenerated energy recovery system is also by tripping, and the alternating current power supply of uncontrollable rectifier circuit is cut, and K3 fault is completely isolated.
Shown in Fig. 1 be one typically railway traction stepdown substation the structure chart can presented after formula regenerated energy recovery system is installed.When underground engines is in brake deceleration operational mode, mechanical energy is fed back into dc bus, shifts DC bus-bar voltage onto.Regenerated energy recovery system constantly monitors DC bus-bar voltage (rated voltage is 1500V), and when voltage is increased to 1750V, regenerative system puts into inverter mode, is AC energy by the electric energy inversion of dc bus, feeds back to ac bus.
Commutation system is connected to dc bus by dc circuit breaker 60.The big current-release protection of 60 choppers is traditionally arranged to be 12000A, and after fault current is more than this definite value, 60 choppers trip at once.The protection domain of this big current-release protection is dc bus, simultaneously can also as the back-up protection of DC feeder (containing contact net feeder line and regenerated energy recovery system feeder line).
Contact net feeder line setting direction rate of change protection, positive direction is that dc bus points to contact net；This protection is mainly used in hiding the interference of locomotive starting current, in order to excise fault in fault early stage.Contact net feeder line is also provided with the protection of big current-release, and its definite value is generally 9000A, and after fault current is more than this definite value, chopper trips at once.
Regenerated energy recovery system has built-in defencive function, adopts current quick-breaking principle, and its current ration is adjusted according to the maximum tolerance of internal system IGBT device.Rule of thumb, its definite value is 2080A, and system power, more than the pulse of locking IGBT control at once after 2080A, is closed inversion function, and sent trip command tripping dc circuit breaker 30 and AC circuit breaker.
In order to realize protecting coordinating of system with the above, dc circuit breaker 30 is according to equipping rules provided by the invention, and relaying configuration is as follows:
1) configuration current quick with direction.This protection specifies that the positive direction of DC current is that dc bus flows to regenerated energy recovery system, now meets direction permissive condition；This protective current threshold fixed value adjusting is 2080A, identical with built-in protective current definite value.In failure process, the rate of change di/dt of fault current is generally less than 400A/ms, and the opening time of 30 dc circuit breakers is generally less than 5ms, and coefficient of reliability takes 1.3, according to formula:Calculating obtains, the time definite value of current quick less than 15.2ms can meet with 60 chopper big current-releases protections coordinate requirement.In order to excise the fault in regenerated energy recovery system more quickly, time delay definite value is actual adjusts as 5ms, as shown in Figure 1.
2) reverse current protection function.This protection specifies that the positive direction of DC current is that dc bus flows to regenerated energy recovery system, meets adverse current entry condition when the current direction is reversed；In order to increase the susceptiveness of protection, high resistance earthing fault still being had to good judgement, the adverse current electric current fixed value adjusting of this protection is 100A；Contact net feeder line is provided with rate of change protection and the protection of big current-release, and the action delay of its wall scroll protection for feed line is not more than 5ms, and the opening time of dc circuit breaker is generally less than 5ms, and coefficient of reliability takes 1.3, according to formula Tset2≥K2×MAX(TL1…TLn)+TcbCalculating obtains, and the delay time definite value of this protection should be greater than 11.5ms, actual adjusts as 12ms, as shown in Figure 1.
3) defencive function jumped by connection.This protection requires that dc circuit breaker is connected chopper by the AC of tripping regenerated energy recovery system while tripping.
Above case study on implementation is only the technological thought that the present invention is described, it is impossible to limits protection scope of the present invention, every technological thought proposed according to the present invention, any change done on technical scheme basis with this, each falls within scope.
Claims (3)
1. the DC side guard method of a regenerated energy recovery system; it is characterized in that: DC side chopper three kinds of defencive functions of configuration of described regenerated energy recovery system; jumping protection including current quick, reverse current protection and connection, described three kinds of defencive functions should coordinate with the existing protection of the built-in protection of regenerated energy recovery system and subway straight-flow system；
Described current quick is the fast tripping protection with direction locking, when the sense of current meet permissive condition and the fault current persistent period more than electric current threshold definite value more than delay time definite value time, tripping DC side chopper；
Described reverse current protection function when the sense of current meet counter-current condition and persistent period more than delay time definite value time, tripping DC side chopper；
The described deciliter state jumping defencive function monitoring dc circuit breaker, dc circuit breaker is by after tripping, and connection is jumped the AC of protection tripping regenerated energy recovery system and connected chopper.
2. the DC side guard method of regenerated energy recovery system as claimed in claim 1, it is characterised in that: in described current quick, direction permissive condition is that DC current flows to regenerated energy recovery system from dc bus；
Electric current threshold definite value Iset1Should be identical with the built-in protection definite value of regenerated energy recovery system, to realize the standby matching relationship with built-in protection；
Delay time definite value Tset1Formula should be metTo realize the standby matching relationship with DC source incoming relay-protection；In formula, TcbMovement time during for dc circuit breaker disjunction fault, IsetmFor the electric current threshold definite value of DC source incoming relay-protection, di/dt is the fault current rate of change in failure process, K1For coefficient of reliability and 1≤K1≤1.5。
3. the DC side guard method of regenerated energy recovery system as claimed in claim 1, it is characterised in that: in described reverse current protection merit, counter-current condition is that DC current flows to dc bus from regenerated energy recovery system；
Delay time definite value Tset2Formula T should be metset2≥K2×MAX(TL1…TLn)+Tcb, to realize the standby matching relationship with dc bus protection for feed line；
In formula, TLnFor the action delay of nth bar protection for feed line, MAX (TL1…TLn) for the maximum of all protection for feed line action delay times, TcbMovement time during for dc circuit breaker disjunction fault, K2For coefficient of reliability and 1≤K2≤1.5。
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| CN201610231883.6A CN105762758B (en) | 2016-04-14 | 2016-04-14 | A kind of DC side guard method for regenerating energy-recuperation system |
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| CN111614067A (en) * | 2020-06-08 | 2020-09-01 | 广州市扬新技术研究有限责任公司 | Direct current traction pilot protection system and method based on optical fiber communication |
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| CN106921147A (en) * | 2017-03-30 | 2017-07-04 | 北京交通大学长三角研究院 | The incoming line switch cabinet protection device and its method of urban track traffic traction substation |
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| CN111614067A (en) * | 2020-06-08 | 2020-09-01 | 广州市扬新技术研究有限责任公司 | Direct current traction pilot protection system and method based on optical fiber communication |
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