CN104779623B - Electric railway traction substation combined compensation system and compensation method - Google Patents
Electric railway traction substation combined compensation system and compensation method Download PDFInfo
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Abstract
The present invention discloses an electric railway traction substation combined compensation system and an electric railway traction substation combined compensation method. The combined compensation system comprises a public-power-grid power supply bus, at least two traction substations connected to the same power supply path as the public-power-grid power supply bus, railway power conditioners, i.e., RPCs and an upper controller, wherein the RPCs and the upper controller are installed in the traction substations. The electric railway traction substation combined compensation system and the electric railway traction substation combined compensation method have the advantages that the total compensation capacity is obviously reduced, residual capacity compensating reactive power is sufficiently utilized, a power factor of a connecting point is better improved and the compensating effect is more direct and more accurate. With the rapid development of projects in China, such as electric railways, high-speed rails and city subways, the method can have wide application prospect.
Description
Technical field
The present invention relates to a kind of Traction Substation of Electric Railway combined compensation system and compensation method, belong to the quality of power supply
Control technology field.
Background technology
The impact accessing to public electric wire net to reduce electric railway installs railway power adjusting it will usually become in traction
Device is rpc(railway power conditioner) etc. power electronics compensate equipment.Conventional rpc is all based on single
Design for Traction Substation, to reach preferable compensation effect, needs larger place capacity, therefore construction cost and operation to damage
Consumption is all very high.And be all then to be powered by same high voltage substation using multiple traction substations, as long as the negative phase-sequence that ferroelectric produces
Electric current flows into public electric wire net without high voltage substation, and the impact to electrical network is just extremely limited, even if it is dirty to there is certain negative phase-sequence
Dye, is also limited to be arrived in the very little region that constituted of supply line of traction change by high voltage substation.
On the one hand, if carrying out independent compensation to single traction change, the compensation capacity requirement that each traction is become is very high,
And due to haveing such problems as that supply line is uneven and traction becomes self-operating parameter unbalance, even if capacity setting is sufficiently large,
Actually still there is negative-sequence current to flow out traction to become.On the other hand, each traction becomes the negative-sequence current phase place producing is inconsistent,
If can naturally offset a part after confluxing.So by hybrid compensation can adjust each traction become negative-sequence current amplitude and
Phase place is so that the negative-sequence current after confluxing is easier to drop to zero.
Content of the invention
Goal of the invention: the shortcoming based on conventional rpc independent compensation and the advantage of multiple rpc hybrid compensation, existing in order to overcome
Have not enough present in technology, the present invention provides a kind of Traction Substation of Electric Railway joint substantially reducing compensation capacity
Compensation system and compensation method.
Technical scheme: for solving above-mentioned technical problem, the present invention provides a kind of Traction Substation of Electric Railway to combine benefit
Repay system, including public electric wire net power supply buses, at least two tractions being connected under the same supply path of public electric wire net power supply buses
Electric substation, the railway power regulation device installed in traction substation is rpc and top level control device；
Described traction substation adopts scott transformer, and output end is t end and m end, 90 ° of phase, and traction load divides
It is not connected on t end and m end；
The AC of described railway power regulation device is connected to t end and the m end of scott transformer.
Wherein, described top level control device includes detection module, control module, receiver module and human-computer interaction module, described
Detection module includes bearing power detector unit and rpc compensating coefficient detector unit, and bearing power detector unit is connected on each scott
The t end of transformer and m end, rpc compensating coefficient detector unit is connected on the Local Controller of each rpc；Described control module, including
Enter line algorithm according to hybrid compensation method to calculate, generate the server that rpc controller runs reference value；Described receiver module be into
The reception of row communication data and the data communications equipment of communication data format and the conversion of controller data form；Described man-machine interaction
Module include carrying out operational factor show and operating parameter setting input/output device.
A kind of Traction Substation of Electric Railway hybrid compensation method, comprises the following steps:
(1) public electric wire net is powered to traction substation by public electric wire net power supply buses, and top level control device online acquisition is each
The power consumption of traction load and each rpc active volume；
(2) inject total negative-sequence current of public electric wire net with public electric wire net power supply buses, that is, the negative-sequence current after confluxing is to mend
Repay target, its real component and idle component are respectively the active difference summation in each stationWith the idle difference summation in each station,
Target Assignment will be compensated to positioned at the different rpc drawing and becoming by compensation method；
(3) rpc near public electric wire net power supply buses is specified to be corrected as terminal rpc, according to tie point itself
Or the negative sequence current value near tie point, by the control targe of terminal rpc, produce local compensation signal, and and top level control
The instruction superposition of device.
Wherein, the compensation method in described step (2) includes two kinds of mode of operations: ratio mode and ordered mode, ratio
Pattern is that total compensation target is proportionally distributed to each rpc, and does not consider each rpc capacity limit；Ordered mode be from away from
Start from the farthest rpc of public electric wire net power supply buses, compensate according to maximum available successively, until needing the total of compensation
Power distribution only finishes.
Wherein, the control targe of terminal rpc described in described step (3) is: the t side control active electric component of negative phase-sequence is
Zero, compensating negative phase-sequence idle component first is zero, and the positive sequence idle component secondly compensating half is zero；M side controls DC voltage
For constant；The positive sequence idle component compensating half is zero.
Inventive principle: present system is made up of it is adaptable to high the railway power regulation device of bottom and top level control device
It is connected to the situation of multiple traction substations under the same public electric wire net power supply buses of pressure electric substation, and draws change and become using scott
Depressor.Each traction becomes internal, installs a rpc, and its AC is connected to two low-pressure ends of transformer respectively.Top level control device
Online acquisition is respectively stood the power of traction load and each rpc active volume, because each traction becomes the negative-sequence current phase place producing being
Inconsistent, if can naturally offset a part after confluxing.So by the unified control targe optimizing each rpc of hybrid compensation
Value, and sends in real time to each bottom rpc, can adjust each traction become the amplitude of negative-sequence current and phase place so that confluxing after
Negative-sequence current be easier to drop to zero.Last rpc has end correction function, can eliminate and there is supply line's imbalance
And the problems such as traction change self-operating parameter unbalance.
Beneficial effect: (1) still adopts conventional rpc on each traction becomes, and is its control targe by top level control
Unification issues, therefore can carry out transformation and upgrade on rpc original base facility, easy to utilize.
(2) according on high-tension side electric parameters, optimize distribution target by top level control device is unified, and what each traction change produced
Negative-sequence current phase place is inconsistent, if can naturally offset a part after confluxing, therefore can significantly decrease total compensation and hold
Amount, and residual capacity compensating reactive power can be made full use of, preferably improve the power factor of tie point.
(3) optimized algorithm can be allocated compensating target according to each rpc residual capacity, and only compensation total capacity being had will
Ask, and respective capacity is had no special requirements, therefore the configuration to capacity and utilization are more reasonable.
(4) last rpc has end correction function, therefore can be from public electric wire net power supply buses the most nearby, directly
Elimination haves such problems as that supply line is uneven and traction becomes self-operating parameter unbalance.
In sum, the present invention has and significantly decreases total compensation capacity, makes full use of residual capacity compensating reactive power, more
Improve well the power factor of tie point, and compensation effect more accurate feature.With China's electric railway, height
The fast development of the projects such as iron, city underground, the method will be gathered around and be had broad application prospects.
Brief description
Fig. 1 is the system construction drawing of the present invention；
Fig. 2 is that the present invention carries out the collocation structure figure of negative sequence compensation using rpc.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is further described.
Embodiment: as shown in figure 1, high voltage substation connects public electric wire net, its public electric wire net power supply buses same confession circuit
It is connected at least two traction substations under footpath.Traction becomes using scott transformer, three-phase alternating current is become and is pressed into two groups of isolation
Single-phase alternating current, output end is t end and m end, 90 ° of phase.Traction load is connected on t end and m end respectively.In each traction becomes
A rpc is installed in portion, and its AC is connected to t end and the m end of scott transformer.Combined compensation system is controlled by above-mentioned rpc and upper strata
Device composition processed.The power consumption of each traction load of top level control device online acquisition and each rpc capacity, are united by hybrid compensation method
The control targe value of one optimization rpc, and send in real time to each bottom rpc.
Top level control device is as shown in figure 1, include detection module, control module, receiver module and human-computer interaction module.
Detection module is distributed in each traction substation.Detection module includes bearing power detector unit and rpc compensates shape
State detector unit.Bearing power detector unit is connected on t end and the m end of each scott transformer；Rpc compensating coefficient detector unit connects
On the Local Controller of each rpc.Their sampled signal is real-time transmitted to control module.
Control module is located at the control centre on upper strata, and real-time control software runs on a server.Control ring root section
According to the traction power of each tractive transformer t side and m side and the compensating coefficient of rpc, carried out by corresponding Optimization Compensation method
Analytical calculation, generates the operation reference value of each rpc controller.Wherein compensation method includes two kinds of mode of operations: ratio mode
And ordered mode, ratio mode is that total compensation target is proportionally distributed to each rpc, and does not consider each rpc capacity limit；
Ordered mode is from the beginning of the rpc farthest apart from public electric wire net power supply buses, compensates according to maximum available successively, directly
Only it is assigned to the general power needing to compensate.
Receiver module is located at each traction substation, is the equipment of data communication, is substantially carried out the acceptance of communication data, with
And the conversion of communication data format and controller data form, the compensation reference of system controlling unit generation can be sent to
Corresponding rpc controller, runs control targe as it.
Human-computer interaction module operates in certain terminal at top level control center, and connects control ring module.Including can enter
Row operational factor shows the input/output device with operating parameter setting.
Due to compensating always having certain deviation it is impossible to guarantee that the negative-sequence current injecting tie point drops to zero completely.Therefore
Using the actual measurement negative phase-sequence value of tie point as reference quantity it is intended that being rpc-1 from the nearest rpc of public electric wire net power supply buses, carry out this
Ground end correction.The i.e. negative sequence current value according to tie point, produces certain thermal compensation signal, be superimposed upon reception control instruction it
On, the actual negative-sequence current of tie point can be further compensate for zero, power factor improves as far as possible.
The present embodiment comprises the following steps:
(1) public electric wire net is powered to traction substation by public electric wire net power supply buses, and top level control device online acquisition is each
The power consumption of traction load and each rpc active volume；
(2) inject total negative-sequence current of public electric wire net with public electric wire net power supply buses, that is, the negative-sequence current after confluxing is to mend
Repay target, its real component and idle component are respectively the active difference summation in each stationWith the idle difference summation in each station,
Target Assignment will be compensated to positioned at the different rpc drawing and becoming by compensation method；
(3) rpc near public electric wire net power supply buses is specified to be corrected as terminal rpc, according to tie point itself
Or the negative sequence current value near tie point, by the control targe of terminal rpc, produce local compensation signal, and and top level control
The instruction superposition of device.
Wherein, the compensation method in described step (2) includes two kinds of mode of operations: ratio mode and ordered mode, ratio
Pattern is that total compensation target is proportionally distributed to each rpc, and does not consider each rpc capacity limit；Ordered mode be from away from
Start from the farthest rpc of public electric wire net power supply buses, compensate according to maximum available successively, until needing the total of compensation
Power distribution only finishes.
Wherein, the control targe of terminal rpc described in described step (3) is: the t side control active electric component of negative phase-sequence is
Zero, compensating negative phase-sequence idle component first is zero, and the positive sequence idle component secondly compensating half is zero；M side controls DC voltage
For constant；The positive sequence idle component compensating half is zero.
The theory deduction process of hybrid compensation method is as follows:
1st, hybrid compensation method principle
Taking under same public electric wire net power supply buses supply path, be connected to three scott tractive transformers as a example analyze, false
If scott tractive transformer high side voltage three-phase equilibrium, three scott transformer parameters are identical, and the no-load voltage ratio of its m side is, and ignore line impedance it is believed that system model is ideal model.
With the three-phase current at higher level's transformer outlet as reference, the three-phase that higher level's transformer is supplied to three traction changes is total
Electric current is:
(1)
WhereinIt is respectively three scott tractive transformer high-pressure side three-phase currents.Then connect according to scott transformer
Line principle can obtain:
(2)
On this basis use symmetrical component method can in the hope of the total sequence current conditions at higher level's transformer outlet it may be assumed that
(3)
Only consideration negative-sequence current situation:
(4)
Can obtain:
(5)
WhereinWithIt is respectively the load of i-th (i=1,2,3) platform scott transformer t side and m side.
Formula (5) is brought into (4) can obtain:
(6)
As can be seen from the above equation, total negative phase-sequence electricity that three scott tractive transformers produce at higher level's transformer outlet
Stream is the superposition of each scott high voltage side of transformer negative-sequence current.Simultaneously it can be seen that the total negative phase-sequence of injection higher level's transformer is electric
Stream is related to the gross spread of multiple scott transformer t sides and m lateral load.Equally, total negative-sequence current can also be divided into two phases
Mutually vertical component: real component and idle component.Compensation to negative-sequence current real component and idle component is exactly to negative phase-sequence
The compensation of electric current.Due to:
(7)
So to inject the total negative-sequence current of higher level's transformer as reference, carrying out to three scott traction transformer systems
During the hybrid compensation of negative-sequence current, as long as the power of scott transformer t side and m side meets formula (8) after making to compensate, then inject
Total negative-sequence current of higher level's transformer is 0.
,(8)
Compensation principle according to rpc (adjusting active power, compensating power difference) is it is known that total compensation quantity of power
For:
；(9)
Minimum capacity required for then understanding,
(10)
Understand the minimum capacity required when carrying out single scott tractive transformer negative sequence compensation,
(11)
Due to,It is possible to obtain:
(12)
As can be seen from the above equation, independently carry out negative sequence compensation with single scott tractive transformer compared with it is considered to multiple transformation
The device hybrid compensation rpc capacity required when reaching identical compensation effect is less.
Meanwhile, according to derivation it is found that when being compensated to multiple scott tractive transformers using rpc, having
Body carries out negative sequence compensation under which tractive transformer, and compensation rate is how many, and these affect less on the result of hybrid compensation.Only
Meeting the negative phase-sequence that whole system compensation rate allows for injecting the total synthesis of higher level's transformer for formula (9) is 0, realizes many
The hybrid compensation of individual tractive transformer.
Consider system side power factor problem after negative phase-sequence full remuneration, due to completing negative phase-sequence with hybrid compensation method
After full remuneration, although each scott tractive transformer t side is not necessarily identical with the load of m side, three scott lead
The total t side drawing the system of transformer composition is identical with the power of m side.Therefore, the synthesis injecting higher level's transformer after compensation is born
Sequence electric current is 0, now the as total three-phase current of the synthesis forward-order current of injection higher level's transformer:
(13)
Two orthogonal components: real component and idle point can also be divided into by the total forward-order current of formula (13)
Amount.Negative phase-sequence is the compensation to power factor to the compensation of the positive sequence reactive component of current after being fully compensated.Now higher level's transformer
The general power of low-pressure side is:
(14)
If now compensating to the idle component of forward-order current, improve power factor.In the 2nd scott traction voltage transformation
The t side of device and m side compensate simultaneouslyReactive power, after compensation, system side power is:
(15)
By above formula it is found that compensating the idle component of forward-order current under any scott tractive transformer, that is, in t
Side and m side compensate identical reactive power it is possible to reduce the reactive power from Systemic absorption simultaneously, improve power factor, and
Negative-sequence current is not affected.
Only consider negative sequence compensation problem in the analysis of hybrid compensation, the real component including negative-sequence current and idle point
Amount.After completing negative sequence compensation, the compensation of forward-order current idle component is realized with in-place reactive power compensation device (as tsc etc.), and
In-situ compensation device capacity is sufficiently large, and after disclosure satisfy that compensation, power factor is 1.
2nd, the system optimizing control compensating
Analyzed from above, the total real component of negative-sequence current of injection higher level's transformer and idle component are respectively as follows:
(1) real component: the summation of scott tractive transformer t side and the active difference in m side；(2) idle component: the total nothing in both sides
Work difference volume.And in hybrid compensation, the compensation of the compensation of negative-sequence current real component and idle component can be disperseed
Complete under different tractive transformers, this does not produce impact to compensation result.Wherein, the compensation of negative-sequence current real component
For the balance adjustment of t side and m side active power, the compensation of negative-sequence current idle component is the difference benefit of t side and m side reactive power
Repay.Therefore invention devises two kinds of mode of operations: ratio mode and ordered mode.
Ratio mode refers to that the total power needing to compensate is proportionately distributed to each scott tractive transformer negative phase-sequence mends
Repay compensating system, do not consider further that the compensation capacity of single rpc limits.
With the negative-sequence current of injection higher level's transformer for compensating target, (just do not considering the reactive power of adjustment power factor
The idle component of sequence electric current) when compensating, total compensation rate is the minimum compensation capacity shown in formula (10).It is thus desirable to adjust
Total active power and the reactive power compensating are respectively as follows:
(16)
(17)
Assume that the active power proportion that each scott transformer needs are adjusted is(), then they need
Active power to be compensated and reactive power are:
(18)
(19)
The situation preferential due to considering negative sequence compensation, the therefore purpose of reactive-load compensation is the same with active regulation, is to adjust
Whole both sides power-balance, that is, compensate the idle component of negative-sequence current.In formula (19) if in, then the idle work(to m side
Rate compensates, and compensation rate is, conversely, reactive-load compensation is carried out to t side.If after compensation, rpc capacity also has residue, more right
Both sides reactive power compensates simultaneously, that is, compensate the idle component of forward-order current, and the compensation carrying out power factor improves.
But it is considered to during rpc capacity limitation problem, this allocation strategy shows irrationality it is impossible to enough make full use of rpc
Capacity compensate.For these reasons, devise sequence compensation method herein again.
Ordered mode refers to from the beginning of the scott transformer farthest apart from higher level's transformer, successively according to parallel connection therewith
The maximal regulated capacity of electric energy regulator rpc coordinates compensation.Assume that No. 3 scott transformer system of distance sides are farthest,
No. 3 rpc capacity in parallel complete the negative sequence compensation of whole system enough therewith, then complete to compensate using No. 3 rpc, and No. 2 and 1
Number not input compensation.If only putting into No. 3 rpc can not complete to compensate, first by No. 3 rpc with maximum compensation rate input compensation, then
No. 2 rpc are come into operation, if negative sequence compensation can be completed, No. 1 rpc not input compensation, otherwise by No. 1 rpc input compensation.
Obtain more preferable negative sequence compensation effect for making full use of rpc compensation capacity, need to consider active point of negative-sequence current
Amount compensates the priority issues and idle component compensation between.Combine consideration each side factor, adjust from active power balance
Preferential coordination strategy.And be with reference to it is considered to mend completely in system side negative-sequence current with higher level's step down side power factor
Carry out the compensation of forward-order current idle component after repaying, improve power factor.
Specific coordinated allocation strategy is: starts distribution of compensation power from the rpc apart from tie point farthest, preferential regulation
The active power balance of whole system, the reactive power vacancy that next carries out both sides compensates, the base finally completing in negative sequence compensation
The compensation of forward-order current idle component is carried out on plinth, improves power factor.The compensation of the idle component of forward-order current is with the spot no
Reactive power compensation installations complete, and think that reactive power compensator (as tsc etc.) on the spot disclosure satisfy that requirement simultaneously.Finally so that injection is public
The negative-sequence current of common-battery net is 0, and power factor is 1.
3rd, end correction method
In practical situations both, two traction change direct ranges are larger, and line impedance can not be ignored, and these all can be to negative
Sequence compensates and impacts.It is noted that the electric current of tie point can be decomposed into real component and idle component, both are mutually
Vertically.
(20)
(21)
Wherein
(22)
By formula (20), (21) and (22) are as can be seen that carrying out reactive-load compensation time-division two parts to scott transformer, right
The compensation of negative phase-sequence idle component is to compensate negative-sequence current, and the compensation to positive sequence idle component on the basis of completing negative sequence compensation is
In order to improve power factor.So controlling by this method from the nearest rpc of public electric wire net power supply buses it is possible to direct control
Tie point processed injects the negative-sequence current of public electric wire net and the reactive power absorbing from public electric wire net.Compensate more direct, play
The effect of whole end correction.
Above example technological thought only to illustrate the invention it is impossible to protection scope of the present invention is limited with this, everything
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, each fall within the protection of the present invention
Within the scope of.
Claims (3)
1. a kind of Traction Substation of Electric Railway hybrid compensation method it is characterised in that: comprise the following steps:
(1) public electric wire net is powered to traction substation by public electric wire net power supply buses, and top level control device online acquisition is respectively drawn
The power consumption of load and each rpc active volume；
(2) inject total negative-sequence current of public electric wire net with public electric wire net power supply buses, that is, the negative-sequence current after confluxing is to compensate mesh
Mark, its real component and idle component are respectively the active difference summation ∑ △ p in each stationiWith the idle difference summation ∑ △ q in each stationi, lead to
Overcompensation method will compensate Target Assignment to positioned at the different rpc drawing and becoming；
(3) rpc near public electric wire net public electric wire net power supply buses is specified to be corrected as terminal rpc, according to tie point
Negative sequence current value or near tie point in itself, by the control targe of terminal rpc, produces local compensation signal, and and upper strata
The instruction superposition of controller.
2. a kind of Traction Substation of Electric Railway hybrid compensation method according to claim 1 it is characterised in that: described
Compensation method in step (2) includes two kinds of mode of operations: ratio mode and ordered mode, and ratio mode is by total compensation mesh
Mark proportionally distributes to each rpc, and does not consider each rpc capacity limit；Ordered mode is from apart from public electric wire net power supply buses
Farthest rpc starts, and compensates according to maximum available successively, till the general power until needing to compensate is assigned.
3. a kind of Traction Substation of Electric Railway hybrid compensation method according to claim 1 it is characterised in that: described
The control targe of terminal rpc described in step (3) is: it is zero that t side controls negative sequence active component, compensates idle point of negative phase-sequence first
Amount is zero, and the positive sequence idle component secondly compensating half is zero；It is constant that m side controls DC voltage；Compensate the positive sequence of half
Idle component is zero.
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| CN106026142B (en) * | 2016-07-21 | 2018-11-02 | 广东电网有限责任公司惠州供电局 | three-phase load unbalance compensation method and system |
| WO2020024505A1 (en) * | 2018-08-02 | 2020-02-06 | 北京千驷驭电气有限公司 | Decentralized reactive power compensation method and system for urban rail transit |
| CN109066737B (en) * | 2018-09-12 | 2024-01-09 | 西南交通大学 | Negative sequence compensation device and method for traction-compensation transformer |
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