CN107834539A - A kind of excess load compensation method based on railway electric energy quality comprehensive treatment device - Google Patents

A kind of excess load compensation method based on railway electric energy quality comprehensive treatment device Download PDF

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CN107834539A
CN107834539A CN201710952176.0A CN201710952176A CN107834539A CN 107834539 A CN107834539 A CN 107834539A CN 201710952176 A CN201710952176 A CN 201710952176A CN 107834539 A CN107834539 A CN 107834539A
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load
compensation
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treatment device
electric energy
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江友华
江相伟
刘雪莹
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Shanghai University of Electric Power
University of Shanghai for Science and Technology
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Shanghai University of Electric Power
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The present invention relates to a kind of excess load compensation method based on railway electric energy quality comprehensive treatment device, methods described comprises the following steps：According to the running status of railway electric energy quality comprehensive treatment device, negative phase-sequence degree of unbalancedness is calculated；According to related parameter values of the railway electric energy quality comprehensive treatment device in the state of full remuneration, with reference to negative phase-sequence degree of unbalancedness, optimal compensation point is determined；According to optimal compensation point, excess load offset is determined, realizes that excess load compensates.Compared with prior art, the present invention has the advantages that load compensation to greatest extent can be ensured when the demand of compensation exceedes compensation capacity and keeps network operation stable.

Description

A kind of excess load compensation method based on railway electric energy quality comprehensive treatment device
Technical field
The present invention relates to the control field of rail traction transformer station, is integrated more particularly, to one kind based on railway electric energy quality The excess load compensation method of controlling device.
Background technology
The power supply of electric railway traction power supply network is reliable and security is that electric locomotive is safe and reliable, economical operation Important leverage.And electric locomotive, as a kind of special electric load, it uses single-phase supplier's formula, when not taking indemnifying measure Inevitably superior power system injection negative-sequence current；Because electric locomotive load is rectification driving and has randomness, Bring the power quality problem severe exacerbation such as idle, harmonic wave, voltage pulsation traction power supply net and its higher level's power train simultaneously The quality of power supply of system.Wherein, the added losses of negative-sequence current increase synchronous motor, reduction transformer contribute, cause relay protection Error action of device etc.；Harmonic current causes generator, transformer, transmission line of electricity added losses, and there may be Harmonics amplification to burn Power equipment；Reactive power deficiency increase transmission line loss, reduces voltage level.Safety to power system and Traction networks can Challenge is brought by power supply.Therefore, it is necessary to take effective control measures, the quality of power supply of traction power supply net is controlled, It is in allowed band, to ensure that power system and Traction networks are securely and reliably powered.
Electric railway negative phase-sequence, harmonic wave and the Reactive-current General Compensation method proposed both at home and abroad at present, which can be divided into, actively administers Two classes are administered with passive.Wherein, the railway power regulator that the main one of which of passive administering method accesses for increase two-phase (Railway Power Conditioner, RPC) and various modification structures.2002, Japan was in the Northeast Shinkansen newly extended Each traction substation is mounted with 20MVA/60kV commercial railway power regulator (railway static power Conditioner, RPCs).RPCs forms back to back structure using two voltage converters (VSC), and DC side shares electricity Hold, AC is tapped in the supply arm of traction substation two.With watt current transfer, reactive-load compensation, stable supply conductor voltage and Filter the functions such as harmonic wave.Operation result shows that for RPC in terms of trailer system supply voltage harmonic improvement is stablized, effect is fine.
But the load of railway locomotive has unstability, mutation electricity can be produced in the case where starting to walk with emergency brake Stream, and in peripheral power equipment aging it can also happen that current break.Existing RPC equipment exceedes self-compensation situation in electric current During maximum can immediately starting protection mechanism so as to completely lose compensation ability, so cause originally with regard to unbalanced power supply network more Add unbalance, great potential safety hazard is brought to upper strata electric power system.
The content of the invention
The purpose of the present invention be provide regarding to the issue above it is a kind of based on the super negative of railway electric energy quality comprehensive treatment device Lotus compensation method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of excess load compensation method based on railway electric energy quality comprehensive treatment device, methods described include following step Suddenly：
1) according to the running status of railway electric energy quality comprehensive treatment device, negative phase-sequence degree of unbalancedness is calculated；
2) related parameter values according to railway electric energy quality comprehensive treatment device in the state of full remuneration, with reference to step 1) Obtained negative phase-sequence degree of unbalancedness, determine optimal compensation point；
3) the optimal compensation point obtained according to step 2), determines excess load offset, realizes that excess load compensates.
Preferably, stating negative phase-sequence degree of unbalancedness is specially：
Wherein, εUFor negative phase-sequence degree of unbalancedness, ε1For both arms current ratio parameter, SLTo be loaded with power capacity amount, SdIt is short for system Appearance of a street amount.
Preferably, the step 2) includes：
21) related parameter values according to railway electric energy quality comprehensive treatment device in the state of full remuneration, it is determined that super negative The functional relation that compensating parameter under lotus compensating coefficient meets；
22) functional relation of compensating parameter, is obtained with reference to step 1) under the excess load compensating coefficient obtained according to step 21) Negative phase-sequence degree of unbalancedness, determine optimal compensation point.
Preferably, the compensating parameter includes active penalty coefficient and offset angle.
Preferably, the functional relation of the compensating parameter satisfaction under the excess load compensating coefficient is specially：
ΔIp+max{ΔIqα,ΔIqβ}=Imax
Wherein, Δ IpFor watt current increment, Δ IqαTo load the reactive current increment on higher α arms, Δ IqβIt is negative Carry the reactive current increment on relatively low β arms, ImaxElectric current is compensated for maximum.
Preferably, the step 22) includes：In the case where compensating parameter meets the functional relation that step 21) obtains, really Surely the negative phase-sequence degree of unbalancedness in step 1) is made to reach the compensating parameter value of minimum value, as optimal compensation point.
Preferably, the step 3) includes：
31) the optimal compensation point obtained according to step 2), is calculated active compensation rate；
32) the optimal compensation point obtained according to step 2), is calculated reactive-load compensation amount；
33) the reactive-load compensation amount that the active compensation rate and step 32) obtained according to step 31) obtains, after calculating compensation Current value, while obtain the sense of current after corresponding compensate.
Preferably, the active compensation rate is specially：
Wherein, IαcTo load the active compensation rate on higher α arms, IβcTo load the active compensation on relatively low β arms Amount, λ0For optimal active penalty coefficient, IαlTo load the supply arm electric current on higher α arms, IβlTo load on relatively low β arms Supply arm electric current.
Preferably, the reactive-load compensation amount is specially：
Wherein, Δ IqαcTo load the reactive-load compensation amount on higher α arms, Δ IqβcIt is idle on relatively low β arms to load Compensation rate, λ0For optimal active penalty coefficient,For optimal compensation angle, IαlTo load the supply arm electric current on higher α arms, IβlTo load the supply arm electric current on relatively low β arms, K IβlWith IαlRatio.
Preferably, the current value after the compensation is specially：
Wherein, I'αl0To load the current value after being compensated on higher α arms, I'βl0To load on relatively low β arms after compensation Current value, λ0For optimal active penalty coefficient,For optimal compensation angle, IαlTo load the supply arm electricity on higher α arms Stream, IβlTo load the supply arm electric current on relatively low β arms, K IβlWith IαlRatio；
The sense of current after corresponding compensation is respectivelyWith
Compared with prior art, the invention has the advantages that：By in railway electric energy quality comprehensive treatment device Electric current when exceeding self-compensation situation maximum, ask for the optimal result that can currently compensate, realize and railway electric energy quality is integrated The undercompensation of controlling device, by this compensation, on the one hand avoid the protection mechanism caused by current break and open The situation that the dynamic power supply network so as to caused by is unbalance, add the stability of power supply network；On the other hand, it also avoid due to protection machine Frequent starting processed and caused by network load increase situation, save energy resource consumption.
Brief description of the drawings
Fig. 1 is the method flow diagram of the excess load compensation method based on railway electric energy quality comprehensive treatment device；
Fig. 2 is the related three-phase current vector figure of excess load compensation, wherein, (2a) is the three-phase current before excess load compensation Vectogram, (2b) are the watt current vectogram after excess load compensation, and (2c) is the watt current and idle after excess load compensation Current vector figure；
Fig. 3 is the relation schematic diagram of compensating parameter and negative phase-sequence degree of unbalancedness.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to Following embodiments.
As shown in Fig. 2 exceed the maximum compensation power of railway electric energy quality comprehensive treatment device (RPC) in compensation power requirement When, RPC can not be fully compensated, and due to the characteristic of RPC shunt compensations, can now carry out undercompensation, be carried out maximum Compensation output under power, to reduce influence of the locomotive to upper strata electric power system to greatest extent.
If UA,UB,UCBusbar voltage obtains low-pressure side voltage u after V/v transformersα,uβ, two supply arm electric currents are Iαl, Iβl, it is assumed that the load of α arms is higher than β arms, i.e. Iαl≥Iβl, make K=Iβl/Iαl, then 0≤K≤1.Because RPC carries out part compensation, if Active penalty coefficient is λ, then watt current increment Delta IpHave：
λ is more big, and active compensation rate is more, and as λ=1, RPC carries out active full remuneration.α, β two-arm is active after compensation Current amplitude is：
While compensating active, reactive-load compensation is also carried out, if its offset angle isThe then reactive current increment of α, β two-arm It is worth and is：
Then two-arm reactive-load compensation sum is：
Wherein 0 °≤φ≤30 °.Left and right two-arm electric current after compensation meets：
The sense of current of α, β two-arm is respectivelyWith
Based on above-mentioned principle, the present embodiment proposes a kind of excess load based on railway electric energy quality comprehensive treatment device and mended Compensation method, comprise the following steps：
1) according to the running status of railway electric energy quality comprehensive treatment device, negative phase-sequence degree of unbalancedness is calculated；
2) related parameter values according to railway electric energy quality comprehensive treatment device in the state of full remuneration, with reference to step 1) Obtained negative phase-sequence degree of unbalancedness, determine optimal compensation point：
21) related parameter values according to railway electric energy quality comprehensive treatment device in the state of full remuneration are (including active Penalty coefficient and offset angle), determine the functional relation that the compensating parameter under excess load compensating coefficient meets；
22) functional relation of compensating parameter, is obtained with reference to step 1) under the excess load compensating coefficient obtained according to step 21) Negative phase-sequence degree of unbalancedness, determine optimal compensation point, be specially：Meet the feelings for the functional relation that step 21) obtains in compensating parameter Under condition, it is determined that making the negative phase-sequence degree of unbalancedness in step 1) reach the compensating parameter value of minimum value, as optimal compensation point；
3) the optimal compensation point obtained according to step 2), determines excess load offset, realizes that excess load compensates, including：
31) the optimal compensation point obtained according to step 2), is calculated active compensation rate；
32) the optimal compensation point obtained according to step 2), is calculated reactive-load compensation amount；
33) the reactive-load compensation amount that the active compensation rate and step 32) obtained according to step 31) obtains, after calculating compensation Current value, while obtain the sense of current after corresponding compensate.
In the present embodiment, the specific implementation process of above-mentioned steps is as follows：
Negative phase-sequence degree of unbalancedness εUMeet：
Wherein, SLTo be loaded with power capacity amount, SdFor system short circuit capacity.
Convolution (6)~(9), λ andSatisfaction：
As K=1, limiting value lim is takenk→1λ=0；And v=2, do not have to compensation watt current now.As known from the above, εU With λ,Related to K, wherein K is known quantity, and λ,The known quantity maximum with RPC compensates electric current I againmaxCorrelation, so according to Knowable to formula (10), εUWith λ,It is curved functional relation.It meets following formula：
Meet that formula (11) makes εUThe point of minimum value is taken, then is optimal compensation point, wherein λ,Value be then optimal compensation ginseng Number, is set to λ0、As shown in figure 3, according to theoretical algorithm, the variable in above-mentioned formula is analyzed, obtain λ,And εU's Graph of a relation, ImaxThe as peak power line, the minimum ε with shadow surface intersectionUData point is then optimal compensation point, corresponding ginseng Number is exactly optimal compensation parameter, as λ0、Now, RPC active compensation rate is：
α, β arm reactive-load compensation amount is respectively：
Two-arm electric current after compensation meets：
The sense of current is respectivelyWith
Work as Iαl≥IβlThat is during 0≤K≤1, Δ Iqαc＞ Δs Iqβc, formula (12) can be rewritten as：
When α arms watt current is less than or equal to β arms, i.e. Iαl≤IβlWhen, analysis principle is same as described above.

Claims (10)

  1. A kind of 1. excess load compensation method based on railway electric energy quality comprehensive treatment device, it is characterised in that methods described bag Include the following steps：
    1) according to the running status of railway electric energy quality comprehensive treatment device, negative phase-sequence degree of unbalancedness is calculated；
    2) related parameter values according to railway electric energy quality comprehensive treatment device in the state of full remuneration, are obtained with reference to step 1) Negative phase-sequence degree of unbalancedness, determine optimal compensation point；
    3) the optimal compensation point obtained according to step 2), determines excess load offset, realizes that excess load compensates.
  2. 2. the excess load compensation method according to claim 1 based on railway electric energy quality comprehensive treatment device, its feature It is, the negative phase-sequence degree of unbalancedness is specially：
    <mrow> <msub> <mi>&amp;epsiv;</mi> <mi>U</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&amp;epsiv;</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>S</mi> <mi>L</mi> </msub> </mrow> <msub> <mi>S</mi> <mi>d</mi> </msub> </mfrac> </mrow>
    Wherein, εUFor negative phase-sequence degree of unbalancedness, ε1For both arms current ratio parameter, SLTo be loaded with power capacity amount, SdHold for system short-circuit Amount.
  3. 3. the excess load compensation method according to claim 1 based on railway electric energy quality comprehensive treatment device, its feature It is, the step 2) includes：
    21) related parameter values according to railway electric energy quality comprehensive treatment device in the state of full remuneration, determine that excess load is mended Repay the functional relation that the compensating parameter under state meets；
    22) functional relation of compensating parameter under the excess load compensating coefficient obtained according to step 21), obtained with reference to step 1) negative Sequence degree of unbalancedness, determine optimal compensation point.
  4. 4. the excess load compensation method according to claim 3 based on railway electric energy quality comprehensive treatment device, its feature It is, the compensating parameter includes active penalty coefficient and offset angle.
  5. 5. the excess load compensation method according to claim 3 based on railway electric energy quality comprehensive treatment device, its feature It is, the functional relation that the compensating parameter under the excess load compensating coefficient meets is specially：
    ΔIp+max{ΔIqα,ΔIqβ}=Imax
    Wherein, Δ IpFor watt current increment, Δ IqαTo load the reactive current increment on higher α arms, Δ IqβFor load compared with Reactive current increment on low β arms, ImaxElectric current is compensated for maximum.
  6. 6. the excess load compensation method according to claim 3 based on railway electric energy quality comprehensive treatment device, its feature It is, the step 22) includes：In the case where compensating parameter meets the functional relation that step 21) obtains, it is determined that making step 1) In negative phase-sequence degree of unbalancedness reach the compensating parameter value of minimum value, as optimal compensation point.
  7. 7. the excess load compensation method according to claim 1 based on railway electric energy quality comprehensive treatment device, its feature It is, the step 3) includes：
    31) the optimal compensation point obtained according to step 2), is calculated active compensation rate；
    32) the optimal compensation point obtained according to step 2), is calculated reactive-load compensation amount；
    33) the reactive-load compensation amount that the active compensation rate and step 32) obtained according to step 31) obtains, the electric current after compensation is calculated Value, while obtain the sense of current after corresponding compensate.
  8. 8. the excess load compensation method according to claim 7 based on railway electric energy quality comprehensive treatment device, its feature It is, the active compensation rate is specially：
    <mrow> <msub> <mi>I</mi> <mrow> <mi>&amp;alpha;</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mrow> <mi>&amp;beta;</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <msub> <mi>&amp;lambda;</mi> <mn>0</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>I</mi> <mrow> <mi>&amp;alpha;</mi> <mi>l</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>I</mi> <mrow> <mi>&amp;beta;</mi> <mi>l</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow>
    Wherein, IαcTo load the active compensation rate on higher α arms, IβcTo load the active compensation rate on relatively low β arms, λ0For Optimal active penalty coefficient, IαlTo load the supply arm electric current on higher α arms, IβlTo load the supply arm on relatively low β arms Electric current.
  9. 9. the excess load compensation method according to claim 7 based on railway electric energy quality comprehensive treatment device, its feature It is, the reactive-load compensation amount is specially：
    Wherein, Δ IqαcTo load the reactive-load compensation amount on higher α arms, Δ IqβcTo load the reactive-load compensation on relatively low β arms Amount, λ0For optimal active penalty coefficient,For optimal compensation angle, IαlTo load the supply arm electric current on higher α arms, IβlFor Load the supply arm electric current on relatively low β arms, K IβlWith IαlRatio.
  10. 10. the excess load compensation method according to claim 7 based on railway electric energy quality comprehensive treatment device, its feature It is, the current value after the compensation is specially：
    Wherein, I'αl0To load the current value after being compensated on higher α arms, I'βl0To load the electricity after being compensated on relatively low β arms Flow valuve, λ0For optimal active penalty coefficient,For optimal compensation angle, IαlTo load the supply arm electric current on higher α arms, Iβl To load the supply arm electric current on relatively low β arms, K IβlWith IαlRatio；
    The sense of current after corresponding compensation is respectivelyWith
CN201710952176.0A 2017-10-13 2017-10-13 A kind of excess load compensation method based on railway electric energy quality comprehensive treatment device Pending CN107834539A (en)

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CN114024338B (en) * 2021-11-25 2024-01-19 华北电力大学 Large-scale wind power collection grid split-phase power flow optimization method and system

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