CN105006831B - Method for controlling AC side voltage of flexible DC power distribution network by energy storage and converter station cooperation - Google Patents
Method for controlling AC side voltage of flexible DC power distribution network by energy storage and converter station cooperation Download PDFInfo
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- CN105006831B CN105006831B CN201510413584.XA CN201510413584A CN105006831B CN 105006831 B CN105006831 B CN 105006831B CN 201510413584 A CN201510413584 A CN 201510413584A CN 105006831 B CN105006831 B CN 105006831B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 53
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 3
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention relates to a method for controlling alternating current side voltage of a flexible direct current power distribution network by matching energy storage with a converter station, and belongs to the technical field of power electronics. The method comprises the following steps: generating a reactive power instruction of a fixed direct-current voltage converter station by a PI (proportional integral) controller according to a difference value between a rated value and an actual measurement value of the alternating-current side voltage of the flexible direct-current power distribution network, and adjusting the alternating-current side voltage of the distribution network by the converter station according to the reactive power instruction; measuring and collecting active power transmitted by a constant direct-current voltage converter station; judging whether the active power exceeds 90% of the capacity of the converter station; if not, the energy storage system operates according to the initial power instruction; if so, an additional power command is given to the energy storage system, the value of the additional power command is 10% of the capacity of the converter station, and the energy storage system operates according to the new power command. The invention fully utilizes the capacity of the energy storage system and the capability of the converter station for quickly adjusting the reactive power, controls the voltage at the alternating current side of the flexible direct current power distribution network at a rated value, ensures the stable operation of the alternating current system, and has good economy and effectiveness.
Description
Technical field
The invention belongs to electric and electronic technical field, coordinate change of current stand control flexible direct current distribution particularly to a kind of energy storage
The method of net AC voltage.
Background technology
Conventional AC power distribution network is faced with power supply capacity deficiency, user requires constantly to the quality of power supply and power supply reliability
Many severe challenges such as raising, distributed power source access.Flexible direct current power distribution network transmit capacity, controllability, the quality of power supply and
The aspects such as power supply reliability possess the performance more excellent than alternating-current system.Flexible direct current power distribution network has obtained widely
Concern and research.Flexible direct current power distribution network passes through voltage source converter incoming transport system, its AC system being coupled etc.
Effect impedance is larger, and capacity of short circuit is less, therefore the voltage of flexible direct current power distribution network and AC system seam can with both it
Between the active power of transmission or the change of reactive power and change.Larger voltage pulsation can produce unfavorable shadow to AC system
Ring, and then have influence on the normal operation of flexible direct current power distribution network.Energy-storage system is contained inside flexible direct current power distribution network, can be by control
The output of energy-storage system processed is changing between flexible direct current power distribution network and AC system the active power of transmission, and then realizes
The constant control of alternating voltage at docking port, but the method the capacity of energy-storage system and peak power output are had very high
Requirement.Because voltage source converter is capable of quick, the flexible control of reactive power, the change of current of control voltage source can be passed through
The reactive power of device is adjusting the alternating voltage of seam, but the reactive power that inverter can improve is subject to inverter capacity
Limit, when the active power of inverter conveying is larger, reactive power is not enough will to lose the ability adjusting alternating voltage.
Content of the invention
The purpose of the present invention is to be directed to when being used alone energy-storage system regulation alternating voltage to energy storage system capacity and output
The higher problem of power requirement, and be used alone during inverter reactive power regulation alternating voltage because inverter capacity limit is led
Cause idle not enough problem, propose a kind of method that energy storage coordinates change of current stand control flexible direct current power distribution network AC voltage, this
Invention takes full advantage of the capacity of energy-storage system and the ability of current conversion station quick regulation reactive power, and flexible direct current power distribution network is handed over
The voltage of stream side controls in rated value it is ensured that the stable operation of AC system, possesses good economy and effectiveness.
The present invention proposes a kind of method that energy storage coordinates change of current stand control flexible direct current power distribution network AC voltage, its feature
It is to comprise the following steps：
(1) by the rated value of flexible direct current power distribution network AC voltage and actual measured value difference therebetween through PI
Controller generates the reactive power instruction Q determining DC voltage current conversion stationref；Determine DC voltage current conversion station to refer to according to this reactive power
Order runs, and adjusts distribution AC voltage；
(2) (limited by current conversion station capacity, the reactive power instruction in step (1) may exceed the fortune of reactive power
Line range, the active power that this scope is transmitted with current conversion station is relevant.) by fixed straight in actual measurement collection flexible direct current power distribution network
The active-power P of stream voltage commutation station transmission；
(3) judge whether the active-power P determining DC voltage current conversion station exceedes the 90% of current conversion station capacity S；If P<90%*
S, then execution step (4)；If P >=90%*S, execution step (5)；
(4) energy-storage system instructs P according to initial powerbattrefRun；
(5) increase a secondary power on the basis of the initial power instruction of energy-storage system and instruct Δ Pbattref, Δ
Pbattref=10%*S, obtains the new power instruction P of energy-storage systembattref+ΔPbattref；Energy-storage system is according to power instruction
Pbattref+ΔPbattrefRun；Wait the next sampling period to arrive, go to step (2).(increase Δ PbattrefAfterwards, determine direct current
The active-power P at voltage commutation station will be reduced within the 90% of current conversion station capacity, determines DC voltage current conversion station reactive power
Range of operation expand, the reactive power instruction generating in step (1) can guarantee the fortune in reactive power under any circumstance
Within line range, current conversion station can be achieved with the constant control of alternating voltage by this reactive power instruction operation.)
The present invention proposes to control to adjust the friendship of flexible direct current power distribution network using the idle coordination that energy-storage system coordinates current conversion station
Stream side voltage, when determine voltage commutation station have power exceed current conversion station capacity 90% when, in the original power of energy-storage system
One additional power instruction is increased on instruction basis, this value is the 10% of current conversion station capacity, and the active power of current conversion station will
Within being reduced to the 90% of capacity, the reactive power being provided that abundance to be realized the constant control of alternating voltage by current conversion station.This
Invention takes full advantage of the capacity of energy-storage system and the ability of current conversion station quick regulation reactive power, and flexible direct current power distribution network is handed over
The voltage of stream side controls in rated value it is ensured that the stable operation of AC system possesses good economy and effectiveness.
Brief description
Fig. 1 coordinates the control principle drawing of change of current stand control flexible direct current power distribution network AC voltage method for energy storage；
Fig. 2 is the active power oscillogram determining DC voltage current conversion station；
Fig. 3 is the reactive power oscillogram determining DC voltage current conversion station；
Fig. 4 is to determine DC voltage current conversion station AC voltage oscillogram.
Specific embodiment
The method that a kind of energy storage proposed by the present invention coordinates change of current stand control flexible direct current power distribution network AC voltage, it is special
Levy and be to comprise the following steps：
(1) by the rated value of flexible direct current power distribution network AC voltage and actual measured value difference therebetween through PI
Controller generates the reactive power instruction Q determining DC voltage current conversion stationref；Determine DC voltage current conversion station to refer to according to this reactive power
Order runs, and adjusts distribution AC voltage；
(2) (limited by current conversion station capacity, the reactive power instruction in step (1) may exceed the fortune of reactive power
Line range, the active power that this scope is transmitted with current conversion station is relevant.) by fixed straight in actual measurement collection flexible direct current power distribution network
The active-power P of stream voltage commutation station transmission；
(3) judge whether the active-power P determining DC voltage current conversion station exceedes the 90% of current conversion station capacity S；If P<90%*
S, then execution step (4)；If P >=90%*S, execution step (5)；
(4) energy-storage system instructs P according to initial powerbattrefRun；
(5) increase a secondary power on the basis of the initial power instruction of energy-storage system and instruct Δ Pbattref, Δ
Pbattref=10%*S, obtains the new power instruction P of energy-storage systembattref+ΔPbattref；Energy-storage system is according to power instruction
Pbattref+ΔPbattrefRun；Wait the next sampling period to arrive, go to step (2).(increase Δ PbattrefAfterwards, determine direct current
The active-power P at voltage commutation station will be reduced within the 90% of current conversion station capacity, determines DC voltage current conversion station reactive power
Range of operation expand, the reactive power instruction generating in step (1) can guarantee the fortune in reactive power under any circumstance
Within line range, current conversion station can be achieved with the constant control of alternating voltage by this reactive power instruction operation.)
The control principle of the inventive method is as shown in figure 1, rated value 10kV by flexible direct current power distribution network AC voltage
With actual measured value VacTherebetween difference obtains the reactive power instruction determining DC voltage current conversion station through PI controller
Qref, current conversion station is by this reactive power instruction operation scalable distribution AC voltage.If the instruction of this reactive power exceeds current conversion station
The range of operation of reactive power, AC voltage will not enable constant control.The range of operation of reactive power is subject to current conversion station
Capacity restriction, relevant with active power, in the case that current conversion station capacity is certain, active power is less, reactive power
Range of operation is bigger.Therefore reduce the active power of current conversion station output by changing the output of energy-storage system, thus
Increase the range of operation of reactive power.When the active power of current conversion station is within the 90% of current conversion station capacity, realize alternating current
The reactive power instruction of pressure constant control can exceed the range of operation of reactive power in no instance.Right in therefore Fig. 1
The active-power P determining DC voltage current conversion station measures and judges whether to exceed the 90% of current conversion station capacity, if exceeding, to storage
Can the additional power instruction Δ P of system onebattref, this instruction is the 10% of current conversion station capacity, and energy-storage system presses new power
Instruction Pbattref+ΔPbattrefAfter operation, within the active power of current conversion station will be reduced to the 90% of capacity.
Embodiment
The inventive method is directed to the hand in hand flexible direct current distribution network system of structure of two ends and illustrates.Current conversion station
Capacity S=15MVA, the 90% of current conversion station capacity is 13.5MW；AC line voltage virtual value control targe is 10kV；Energy storage
System initial power instructs Pbattref=0, Δ Pbattref=1.5MW；System operation time is 24h.
Press step according to method proposed by the present invention to run, the result obtaining is described as follows：Fig. 2 waveform shows, 12:00
To 16:Between 00, current conversion station initially has power more than 13.5MW, after method proposed by the present invention, by energy storage system
After unified additional power instruction 1.5MW, the active power of current conversion station drop to 13.5MW (the 90% of current conversion station capacity) with
Interior, when follow-up active power is more than 13.5MW, apply method proposed by the invention, the active power of current conversion station is same
Within dropping to 13.5MW (the 90% of current conversion station capacity).Fig. 3 waveform shows that the reactive power that current conversion station provides is transported at it all the time
Within line range, after Fig. 4 waveform shows the method adopting using the present invention, AC voltage can be by constant control in rated value
10kV.
Claims (1)
1. a kind of energy storage coordinates the method for change of current stand control flexible direct current power distribution network AC voltage it is characterised in that the method
Comprise the following steps：
(1) by the rated value of flexible direct current power distribution network AC voltage and actual measured value difference therebetween through PI control
Device generates the reactive power instruction Q determining DC voltage current conversion stationref；Determine DC voltage current conversion station and instruct fortune according to this reactive power
OK, adjust power distribution network AC voltage；
(2) determine the active-power P of DC voltage current conversion station transmission in the flexible direct current power distribution network of measurement collection in real time；
(3) judge whether the active-power P determining DC voltage current conversion station exceedes the 90% of current conversion station capacity S；If P<90%*S, then
Execution step (4)；If P >=90%*S, execution step (5)；
(4) energy-storage system instructs P according to initial powerbattrefRun；
(5) initial power in energy-storage system instructs PbattrefOn the basis of increase secondary power and instruct Δ Pbattref, Δ
Pbattref=10%*S, obtains the new power instruction P of energy-storage systembattref+ΔPbattref；Energy-storage system is according to power instruction
Pbattref+ΔPbattrefRun；Wait the next sampling period to arrive, go to step (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510413584.XA CN105006831B (en) | 2015-07-14 | 2015-07-14 | Method for controlling AC side voltage of flexible DC power distribution network by energy storage and converter station cooperation |
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| CN201510413584.XA CN105006831B (en) | 2015-07-14 | 2015-07-14 | Method for controlling AC side voltage of flexible DC power distribution network by energy storage and converter station cooperation |
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| CN105006831A CN105006831A (en) | 2015-10-28 |
| CN105006831B true CN105006831B (en) | 2017-03-01 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106469913B (en) * | 2016-09-26 | 2019-05-21 | 深圳供电局有限公司 | Method for stabilizing power fluctuation of flexible direct current power distribution network |
| CN107124010B (en) * | 2017-04-27 | 2020-11-06 | 上海交通大学 | Control method for network deviation response index of flexible direct current power distribution network |
| CN109818376B (en) * | 2017-11-20 | 2022-07-22 | 国网江苏省电力公司徐州供电公司 | Active power control method for power supply system of flexible distribution network |
| WO2022142812A1 (en) * | 2020-12-31 | 2022-07-07 | 中国长江三峡集团有限公司 | Multi-end offshore wind power flexible direct current and energy storage cooperative grid-connected system and control method thereof |
Citations (2)
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| CN103368170A (en) * | 2013-06-26 | 2013-10-23 | 许继集团有限公司 | Converter and control method of multi-end soft direct current power transmission system |
| CN104734189A (en) * | 2015-03-27 | 2015-06-24 | 武汉大学 | Wind power dispersion and integration droop control method based on VSC-HVDC |
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| CN103368170A (en) * | 2013-06-26 | 2013-10-23 | 许继集团有限公司 | Converter and control method of multi-end soft direct current power transmission system |
| CN104734189A (en) * | 2015-03-27 | 2015-06-24 | 武汉大学 | Wind power dispersion and integration droop control method based on VSC-HVDC |
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