CN105958622B - A kind of related direct current network busbar voltage auxiliary control method of state-of-charge - Google Patents
A kind of related direct current network busbar voltage auxiliary control method of state-of-charge Download PDFInfo
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- CN105958622B CN105958622B CN201610383854.1A CN201610383854A CN105958622B CN 105958622 B CN105958622 B CN 105958622B CN 201610383854 A CN201610383854 A CN 201610383854A CN 105958622 B CN105958622 B CN 105958622B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000004146 energy storage Methods 0.000 claims abstract description 58
- 230000001934 delay Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000011217 control strategy Methods 0.000 abstract description 4
- 230000033228 biological regulation Effects 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
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Classifications
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to operation and control of electric power system technical field, the related direct current network busbar voltage auxiliary control method of more particularly to a kind of state-of-charge, voltage control can selectively be carried out according to the state-of-charge SOC of battery energy storage device itself, the state-of-charge SOC of each battery energy storage device is introduced into control flow, by calculating whether each battery energy storage device puts into voltage control and ordering in launching and power output, the power output for distributing each battery energy storage device automatically is realized, and the whole-process automatic completion of control strategy communicates independent of between device.
Description
Technical field
The present invention relates to operation and control of electric power system technical field, the related direct current of more particularly to a kind of state-of-charge
Net busbar voltage auxiliary control method.
Background technology
As traditional fossil energy is increasingly exhausted, Global climate change and problem of environmental pollution getting worse, in order to meet
The growing energy demand of human society, mitigate environmental pressure, it would be highly desirable to exploitation cleaning, low-carbon, sustainable green energy resource, together
Shi Shixian electric energy substitutes, and reduces the consumption to fossil energy.The regenerative resource rich reserves such as solar energy, wind energy, are preferable
Alternative energy source, can be developed by way of distributed power generation, have be not easy to be limited to by region, transformation efficiency is high and is advantageous to
Resource such as makes full use of at the advantage, can improve energy supply reliability.The popularization of electric automobile can effectively reduce consumption of petroleum, lead to
Crossing V2G technologies makes batteries of electric automobile interactive with power network, participates in power network regulation as battery energy storage device, being favorably improved can be again
Raw energy utilization rate and economic power system.So distributed power source and electric automobile have obtained national governments and industrial quarters in recent years
Promotion energetically, quickly grow.Direct current network is one of following power distribution network development new direction, in recent years by the extensive of academia
Concern, and have demonstration project input application.One of advantage of direct current network is exactly flexible open, eliminates dc source and charge and discharge
The inversion link of electric installation access, is greatly reduced distributed power generation networking cost, can adapt to its a large amount of access.
At present, the operation control technology of direct current network still research and development the stage, voltage control aspect mainly study
How between each controllable power source reasonable distribution power, realize Network Voltage Stability.Has DC voltage error method plan at present
Slightly, DC voltage slop control strategy and voltage deviation slop control strategy etc., multiple AC/DC current conversion stations can be achieved and participate in multiterminal
Direct-current transmission voltage controls, and has the advantages of master-slave swap and power distribution can be achieved independent of communication between current conversion station.For
Distributed power source and electric automobile access direct current network, generally comprise an AC/DC transverter, some battery energy storage devices (specially
With energy storage device or bidirectional electric automobile charge and discharge device) and some uncontrolled distributed power generation units.Wherein, battery stores up
The state-of-charge SOC of energy device itself is an important factor for influenceing voltage deviation threshold and input delay.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of related direct current network busbar voltage auxiliary of state-of-charge
Control method, voltage control can be selectively carried out according to the state-of-charge SOC of battery energy storage device itself, and can be certainly
The power output of dynamic each battery energy storage device of distribution, and the whole-process automatic completion of control strategy communicates independent of between device.
The technical scheme is that：
The related direct current network busbar voltage auxiliary control method of a kind of state-of-charge, applied to each battery energy storage device
On, comprise the following steps that：
Step 1 measurement DC bus-bar voltage UB, judge UBWhether U is more thanHN+(UMAX–UHN)·SOC；If then perform step
2, if otherwise performing step 3.
Step 2 delay TDU is judged after SOC againBWhether U is more thanHN+(UMAX–UHN)·SOC；If then utilize formula 1
Calculate battery energy storage rating of set output P
If battery energy storage rating of set is otherwise made to export P=PC。
Step 3 judges UBWhether U is less thanLN–(ULN–UMIN)(1–SOC)；If step 3-a is then performed, if otherwise performing step
Rapid 3-b.
Step 3-a delays TDU is judged again after (1-SOC)BWhether U is less thanLN–(ULN–UMIN)(1–SOC)；If then utilize
Formula 2 calculates battery energy storage rating of set output P
If battery energy storage rating of set is otherwise made to export P=PC。
Step 3-b makes battery energy storage rating of set export P=PC。
Wherein, UBFor DC bus-bar voltage, unit kV；UMAXFor dc bus maximum operating voltage, unit kV；UMINTo be straight
Flow the minimum operating voltage of bus, unit kV；UHN、ULNFor predeterminated voltage and UHN>ULN, unit kV；TDFor preset time, unit ms；
SOC is energy storage device state-of-charge, unit %；PCFor the normal charge-discharge electric power of battery energy storage device, unit kW；PMAXFor
The peak power output of battery energy storage device, unit kW；PMINFor the minimum output power of battery energy storage device, unit kW；PMAX
Or PMINTo represent battery energy storage device absorbed power during negative value.
Beneficial effects of the present invention：The present invention is applied to the grid-connected multiple battery energy storage devices of direct current.When direct current network control
When the AC/DC transverters of DC bus-bar voltage processed lose voltage control capability because of out of service or Operation at full power, battery storage
Energy device can be according to technical scheme power output provided by the invention, so as to participate in the control of the auxiliary of DC bus-bar voltage.This
The beneficial effect of invention is selectively to be put into according to precedence straight according to the state-of-charge of battery energy storage device
Flow the auxiliary control of busbar voltage, and the reasonable distribution power output between the battery energy storage device of control aid in.
Brief description of the drawings
Fig. 1 is typical distributed power source direct current access system composition schematic diagram.
Fig. 2 is the schematic flow sheet of the present invention.
Fig. 3 is the power vs. voltage curve figure of the present invention.
Embodiment
Fig. 1 is a typical distributed power source direct current access system, including 1 dc bus, 1 AC/DC transverter,
2 battery energy storage devices and 2 photovoltaic power generation apparatus.AC/DC transverters are voltage source converter, as AC network and direct current
Energy exchange interface between access system；Battery energy storage device is directly accessed dc bus, can control it in rated range
Send or absorbed power；Photovoltaic power generation apparatus can be directly accessed dc bus on the spot, can also be connect by one section of DC line
Enter, its generated output is determined by natural conditions, without control.DC bus-bar voltage is controlled during AC/DC transverter normal operations
For rated voltage UN, battery energy storage device according to chargometer draw operate under constant dc power control pattern, power PC；When AC/DC is changed
When stream device hinders out of service or power and reaches bound and lose voltage control capability for some reason, DC bus-bar voltage is by institute of the present invention
The method stated is adjusted by battery energy storage device.
Fig. 2 is the flow chart of technical solution of the present invention, and Fig. 3 is the work(that voltage-regulation is performed with reference to technical solution of the present invention
Rate-voltage curve.Principles of the Fig. 3 according to described by Fig. 2 is drawn, wherein, by representing PMAX、PMIN、UMAX、UMINDotted line wrapped
The rectangle enclosed be battery energy storage device maximum range of operation, UNFor rated voltage.Such as power vs. voltage curve ABCD：B points are indulged
Coordinate pair answers UHN+(UMAX–UHN) SOC, C point ordinate corresponds to ULN–(ULN–UMIN) (1-SOC), work as UBIn this voltage range
When, power-voltage curve is line segment BC, and battery energy storage device controls without voltage, and power output P is normal charge and discharge electric work
Rate PC；Work as UBExceed and in delay TDStill above U after SOCHN+(UMAX–UHN) SOC when, battery energy storage device carry out voltage
Auxiliary control, power output raises with voltage and equal proportion reduces (can be negative), if busbar voltage reaches UMAXWhen power output
It is minimized PMIN, power-voltage curve is line segment AB；Work as UBIt is less than and in delay TDU still is below after (1-SOC)LN–(ULN–
UMIN) (1-SOC) when, battery energy storage device carry out voltage auxiliary control, power output with voltage reduce and equal proportion increase, when
Busbar voltage reaches UMINWhen power output increase arrive maximum PMAX, power-voltage curve is line segment CD.
When battery energy storage device SOC increases, B points, C points move vertically upward, BC curves left side dash area in figure
It is mobile；When battery energy storage device SOC reduces, B points, C points are moved vertically downward, and BC curves right shade part in figure is moved
It is dynamic.When accessing multiple battery energy storage devices on dc bus, battery energy storage device can be achieved according to itself SOC situation, there is choosing
Participate in boost voltage control with selecting：As busbar voltage UBDuring the downward pressure regulation of higher needs, the less battery energy storage assembly firsts of SOC
Regulation；As busbar voltage UBDuring the upward pressure regulation of relatively low needs, battery energy storage assembly first regulation larger SOC.Delay and SOC phases
Pass can make multiple different SOC battery energy storage device in time limit TDInterior priority participates in auxiliary control, prevents a large amount of battery energy storages
Device puts into generation voltage oscillation simultaneously.
Embodiment gives UNFor 10kV (UNFor AC/DC transverter normal operations when dc bus rated voltage), PMAXFor
50kW, PMINFor -50kW, UMAXFor 11kV, UMINFor 9kV, UHNFor 10.5kV, ULNFor 9.5kV, TDFor 200ms.Battery energy storage fills
The SOC for putting #1 is 20%, PCFor -5kW, then work as UBVoltage auxiliary control is carried out during more than 10.6kV, be delayed 40ms；Work as UBIt is less than
Voltage auxiliary control is carried out during 9.1kV, be delayed 160ms.Battery energy storage device #2 SOC is 80%, PCFor 1kW, then work as UBIt is more than
Voltage auxiliary control is carried out during 10.9kV, be delayed 160ms；Work as UBVoltage auxiliary control is carried out during less than 9.4kV, be delayed 40ms.
If DC bus-bar voltage UBFor 10kV, then battery energy storage device #1 output -5kW, battery energy storage device #2 output 1kW, do not enter
The auxiliary control of row voltage；If DC bus-bar voltage UBRise and be maintained at 10.8kV, then battery energy storage device #1 is delayed after 40ms
Output -27.5kW carries out voltage auxiliary control, and battery energy storage device #2 exports 1kW and aids in controlling without voltage；If direct current is female
Line voltage UBRise and be maintained at 10.95kV, then output -44.38kW progress voltages are auxiliary after battery energy storage device #1 delays 40ms
Help control, output -27.5kW carries out voltage auxiliary control after battery energy storage device #2 delays 160ms.
Embodiment described above is only the preferred embodiments of the present invention, and the simultaneously exhaustion of the feasible implementation of non-invention.It is right
For persons skilled in the art, on the premise of without departing substantially from the principle of the invention and spirit to any aobvious made by it and
The change being clear to, it should all be contemplated as falling with the claims of the present invention.
Claims (1)
1. the related direct current network busbar voltage auxiliary control method of a kind of state-of-charge, it is characterised in that it is applied to each electricity
On the energy storage device of pond, comprise the following steps that：
Step 1 measurement DC bus-bar voltage UB, judge UBWhether U is more thanHN+(UMAX–UHN)·SOC；If then performing step 2, if
Otherwise step 3 is performed；
Step 2 delay TDU is judged after SOC againBWhether U is more thanHN+(UMAX–UHN)·SOC；If then calculated using formula 1
Battery energy storage rating of set exports P
If battery energy storage rating of set is otherwise made to export P=PC；
Step 3 judges UBWhether U is less thanLN–(ULN–UMIN)(1–SOC)；If then performing step 3-a, if otherwise performing step 3-
b；
Step 3-a delays TDU is judged again after (1-SOC)BWhether U is less thanLN–(ULN–UMIN)(1–SOC)；If then utilize formula
2 calculate battery energy storage rating of set output P
If battery energy storage rating of set is otherwise made to export P=PC；
Step 3-b makes battery energy storage rating of set export P=PC；
Wherein, UBFor DC bus-bar voltage, unit kV；UMAXFor dc bus maximum operating voltage, unit kV；UMINIt is female for direct current
The minimum operating voltage of line, unit kV；UHN、ULNFor predeterminated voltage and UHN>ULN, unit kV；TDFor preset time, unit ms；SOC
For energy storage device state-of-charge, unit %；PCFor the normal charge-discharge electric power of battery energy storage device, unit kW；PMAXFor battery
The peak power output of energy storage device, unit kW；PMINFor the minimum output power of battery energy storage device, unit kW；PMAXOr PMIN
To represent battery energy storage device absorbed power during negative value.
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| CN201610383854.1A CN105958622B (en) | 2016-06-01 | 2016-06-01 | A kind of related direct current network busbar voltage auxiliary control method of state-of-charge |
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| CN201610383854.1A CN105958622B (en) | 2016-06-01 | 2016-06-01 | A kind of related direct current network busbar voltage auxiliary control method of state-of-charge |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751943A (en) * | 2012-04-24 | 2012-10-24 | 中国石油大学(北京) | Electronic control system of electric workover rig |
| CN105071438A (en) * | 2015-08-12 | 2015-11-18 | 安徽明赫新能源有限公司 | Photovoltaic energy storage and power generation integrated grid-connected system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7839027B2 (en) * | 2008-10-09 | 2010-11-23 | The Aes Corporation | Frequency responsive charge sustaining control of electricity storage systems for ancillary services on an electrical power grid |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751943A (en) * | 2012-04-24 | 2012-10-24 | 中国石油大学(北京) | Electronic control system of electric workover rig |
| CN105071438A (en) * | 2015-08-12 | 2015-11-18 | 安徽明赫新能源有限公司 | Photovoltaic energy storage and power generation integrated grid-connected system |
Non-Patent Citations (2)
| Title |
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| 具有储能功能的模块化多电平换流器的控制方法;郭捷 等;《现代电力》;20151031;第32卷(第5期);第73-78页 * |
| 基于混合储能系统的插电式混合动力汽车能量管理策略优化研究;王磊 等;《农业装备与车辆工程》;20150731;第53卷(第7期);第65-69页 * |
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