CN106684852A - Flexible DC grid voltage management center and voltage stability control method thereof - Google Patents
Flexible DC grid voltage management center and voltage stability control method thereof Download PDFInfo
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- CN106684852A CN106684852A CN201710060853.8A CN201710060853A CN106684852A CN 106684852 A CN106684852 A CN 106684852A CN 201710060853 A CN201710060853 A CN 201710060853A CN 106684852 A CN106684852 A CN 106684852A
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- pressure regulation
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- 230000033228 biological regulation Effects 0.000 claims abstract description 50
- 238000006243 chemical reaction Methods 0.000 claims description 39
- 230000005611 electricity Effects 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000005457 optimization Methods 0.000 claims description 7
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 230000010349 pulsation Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 2
- 206010021703 Indifference Diseases 0.000 claims 1
- 230000003993 interaction Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
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- 238000012546 transfer Methods 0.000 description 2
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Classifications
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- H02J13/0079—
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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
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a flexible DC grid voltage management center and a voltage stability control method thereof. The voltage management center comprises a DC voltage control main station and a DC voltage control substation set up in the converter station. The DC voltage control substation and the main station comprise a primary voltage regulation control system and a secondary voltage regulation control system respectively; the voltage stationary control method comprises setting each converter station of the flexible DC grid once, and regulating voltage to trigger the threshold values twice. The way of the adjusting voltage is selected through the voltage judgement. The method realizes the hierarchical voltage regulation of the flexible DC grid under different fault conditions as well as a direct coordination and interaction with a new energy unit, on the basis of giving full play to the rapidity of the DC grid control, the operation stability is improved.
Description
Technical field
The present invention relates to flexible direct current dispatching of power netwoks control field, more particularly to a kind of flexible direct current line voltage management
Center and its Voltage Stability Control method.
Background technology
Compared with customary DC is transmitted electricity, flexible DC power transmission has many technical advantages.Especially flexible DC power transmission system
When in system, trend overturns, DC current is reverse, and DC voltage polarity is constant, to constituting MTDC transmission system in parallel and unidirectional current
Net is extremely advantageous.Using this feature of flexible direct current, China builds five end flexible DC power transmission engineering of Zhoushan, and
Four end flexible direct current electrical network demonstration project of planning construction Zhangbei County, this will be that first high voltage, jumbo flexibility are straight in the world
Stream electrical network.
With multiterminal element ratio, direct current network have higher device redundancy, have no effect on after single current conversion station locking whole
The network topology of individual straight-flow system, after certain DC line line failure, DC power flow can be redistributed according to All other routes
Roundabout afterwards to send, power supply reliability is higher.Particularly to bipolar DC transmission system, after one pole inverter or line fault,
Also band can be turned by interpolar power, it is ensured that the power-balance in whole direct current network, with higher operational flexibility.
While improving flexible direct current operation of power networks reliability, these flexible and changeable methods of operation increased flexible direct current
The complexity of the scheduling controlling of electrical network.One of key point of flexible direct current electrical network reliability service is voltage stabilization.Relative to biography
The AC network and multiterminal flexible direct current system of system, the voltage stabilization Dispatching Control System of flexible direct current electrical network and method are at present also
In technological gap.
For the problems referred to above, it is an object of the invention to provide a kind of flexible direct current line voltage administrative center, another object
It is to provide a kind of Voltage Stability Control method based on this voltage management center.So as to realize flexible direct current Network Voltage Stability
The classification control of problem, it is ensured that the reliability service of flexible direct current electrical network.
The content of the invention
The present invention provides a kind of flexible direct current line voltage administrative center, and the voltage management center includes that unidirectional current is voltage-controlled
The DC voltage control substation arranged in main website processed and current conversion station, the DC voltage control main website and DC voltage control substation
It is connected by high speed communication passage；It is voltage-controlled with unidirectional current by DC voltage control main website between the DC voltage control substation
High speed communication passage between system station is connected, and transmits mutually respective running state information；
The DC voltage control main website includes secondary voltage control system, and the DC voltage control substation is included once
Voltage control system；
The DC voltage control substation is provided with DC voltage control main website standby station.
When sending end current conversion station is joined directly together with generation of electricity by new energy station, the DC voltage control substation of sending end current conversion station arranges new
Energy unit assists control system, assist control of the new forms of energy unit association control system by new forms of energy unit directly to control new energy
What source generated electricity exerts oneself.
The DC voltage control substation includes a voltage control system, in voltage slight fluctuations or generation DC Line Fault
But when current conversion station voltage does not trigger secondary pressure regulation, directly carry out voltage control.
The voltage control main website includes secondary voltage control system, and the secondary voltage control system includes that voltage is steady
Determine high-speed optimization computing system, when direct current catastrophe failure causes current conversion station voltage pulsation to trigger secondary pressure regulation, precise control is most
Excellent current conversion station voltage.
DC voltage control main website standby station includes a voltage control system and secondary voltage control system.
The DC voltage control main website and voltage control main website standby station are special with the protection of flexible direct current power grid control respectively
Net is connected, and receives the flexible direct current electric network fault information that flexible direct current power grid control protection private network sends.
The voltage management center is connected with each other by communication system with control centre, by the real-time fortune of flexible direct current electrical network
Row state transfer is to control centre, and receives the control instruction of control centre.
Control centre arranges the current conversion station normal voltage range of operation and two of the flexible direct current line voltage administrative center
Secondary pressure regulation triggers threshold value.
A kind of Voltage Stability Control method based on flexible direct current line voltage administrative center, the Voltage Stability Control side
Method comprises the steps：
Step 1：According to the method for operation of flexible direct current electrical network, current conversion station normal voltage range of operation and flexible direct current are set
Electric grid secondary pressure regulation triggers threshold value；
Step 2：Flexible direct current power grid control protection private network judges whether to break down, if breaking down, into step 3,
If not breaking down, pressure regulation terminates；
Step 3：Judge whether voltage exceedes secondary pressure regulation and trigger threshold value, if voltage is less than secondary pressure regulation threshold value, respectively
DC voltage control substation adopts a pressure regulation；If voltage is more than secondary pressure regulation threshold value, DC voltage control main website adopts two
Secondary pressure regulation；
Step 4：Judge whether voltage exceedes normal voltage range of operation, if exceeding, return to step 3, if voltage is just returned to
Normal range of operation, voltage-regulation terminate.
Pressure regulation is real-time droop control, according to the voltage response of current conversion station, directly by DC voltage
Control sub-station pressure regulation.
The secondary pressure regulation is quick non differential regulation, according to voltage stabilization high-speed optimization computing system, accurately calculates failure
In the case of each current conversion station optimal voltage, assign control instruction from DC voltage control main website to DC voltage control substation.
Pressure regulation is with secondary pressure regulation by controlling the power of current conversion station come control voltage.
With immediate prior art ratio, the present invention provide technical scheme have the advantages that：
1. the technical scheme that the present invention is provided, by setting up flexible direct current line voltage administrative center, is respectively provided with direct current
Voltage controls main website and substation, realizes real-time monitoring and the control of full direct current net voltage, and arranges one or more unidirectional currents
Voltage-controlled main website standby station processed, improves the reliability at voltage management center；
2. the technical scheme that the present invention is provided, flexible direct current line voltage control centre pass through high speed communication with control centre
System is connected with each other, and the operation information of flexible direct current electrical network can be sent to control centre in real time and receive the control of control centre
Instruction.Elder generation is directly quick corresponding by voltage control centre in a failure mode and processes, if system still can not be stablized, transfers to
Control centre controls, and takes full advantage of the function of flexible direct current electrical network quick control；
3. the technical scheme that the present invention is provided, by the control system of association that new forms of energy unit is added in DC voltage control substation
System, realizes flexible direct current electrical network and directly controls exerting oneself for new forms of energy unit in a failure mode, make generation of electricity by new energy with flexibility
Direct current network is directly worked in coordination, the characteristics of given full play to flexible direct current power grid control rapidity and " net " " source " coordinates control
Advantage, improves the stability that sending end current conversion station new forms of energy isolated island is sent.
4. the technical scheme that the present invention is provided, there is provided the two-step evolution method of flexible direct current line voltage, by once
Pressure regulation and secondary pressure regulation, for different Voltage-stabilizing Problems, it is possible to achieve the accurate classification of direct current network voltage, classification control
System, improves the operation stability of flexible direct current electrical network.
5. the technical scheme that the present invention is provided, according to each node voltage of flexible direct current electrical network and the coupled relation of power, leads to
The power for overregulating each current conversion station realizes the optimizing regulation of flexible direct current electrical network whole network voltage, improves the essence of voltage optimization regulation
Degree and exploitativeness.
Description of the drawings
Fig. 1 is the flexible direct current line voltage administrative center schematic diagram of the embodiment of the present invention；
Fig. 2 is the flexible direct current Network Voltage Stability control method flow chart of the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in detail.
As shown in figure 1, the flexible direct current line voltage administrative center of the present invention includes a DC voltage control main website, and
DC voltage control substation is set in other current conversion stations, if sending end current conversion station and the direct phase of generation of electricity by new energy (such as wind-powered electricity generation, photovoltaic)
Even, also need to arrange new forms of energy unit association control system in the current conversion station.In the flexible direct current line voltage administrative center and scheduling
The heart is connected with each other by communication system, the real-time running state of flexible direct current electrical network is transmitted to control centre, and receives scheduling
The control instruction at center.Each current conversion station normal voltage fortune is assigned in flexible direct current line voltage administrative center in the control centre
Line range, secondary pressure regulation triggering threshold value.The voltage control main website is connected with flexible direct current power grid control protection private network, is received
The flexible direct current electric network fault information that control protection private network sends.The DC voltage control main website and each DC voltage control
Stand, DC voltage control substation can be by running status real-time Transmission to DC voltage control master
Stand, DC voltage control main website can directly control the voltage of DC voltage control substation.Lead between the DC voltage control substation
The high speed communication passage crossed between DC voltage control main website and DC voltage control substation is connected, and can transmit mutually respective operation
Status information.
The DC voltage control substation includes a voltage control system, can in voltage slight fluctuations or DC Line Fault but
When current conversion station voltage does not trigger secondary pressure regulation, voltage control is directly carried out.The DC voltage control main website includes secondary tune
Pressure control system, i.e. voltage stabilization high-speed optimization computing system, direct current catastrophe failure cause current conversion station voltage pulsation triggering secondary
In the case of pressure regulation, each change of current substation voltage of optimum is accurately controlled out.New forms of energy unit association control system can pass through new energy
The assist control of source unit, directly controls exerting oneself for generation of electricity by new energy, such as directly controls exciter control system of wind-powered electricity generation etc..It is described
One or more DC voltage control main website standby stations are set in DC voltage control substation, and DC voltage control main website is standby
Also it is connected with control protection private network with station.
Fig. 2 show the voltage control method based on voltage management center.The voltage and power of each node in direct current network
Relation such as following formula：
In above formula, i, j represent current conversion station numbering, and i ≠ j respectively；Yij represents that connection i-th, the circuit of two current conversion stations of j are led
Receive；Ui, uj are respectively i-th, j current conversion station busbar voltages.As can be seen from the above equation, each current conversion station voltage and output phase coupling
Close, by controlling each current conversion station power, you can reach the purpose of control voltage.Therefore a Regulation Control in Fig. 2 with it is secondary
Regulation Control adjusts current conversion station voltage by Power Control.
A kind of Voltage Stability Control method based on flexible direct current line voltage administrative center that the present invention is provided, including such as
Lower step：
Step 1：According to the method for operation of flexible direct current electrical network, it is straight with flexibility that each current conversion station normal voltage range of operation is set
Stream electric grid secondary pressure regulation triggering threshold value.
Step 2：Protect private network to judge whether to break down by flexible direct current power grid control, if breaking down, walked
Rapid 3, otherwise, pressure regulation terminates.
Step 3：Judge whether more than secondary pressure regulation threshold value, if voltage exceedes secondary pressure regulation threshold value, voltage control master
The information stood according to the transmission in real time of each current conversion station, optimization calculate the optimum performance number in each station, by controlling each current conversion station
Performance number carries out secondary pressure regulation, terminates after secondary pressure regulation；If being less than secondary pressure regulation threshold value, each voltage control sub-station is according to each
Voltage characteristic of standing carries out a pressure regulation.
Step 4：Voltage out-of-limit judgement is carried out again, if voltage exceedes normal operation range, returns previous step, if voltage
Normal operation range is returned to, voltage-regulation terminates.
Finally it should be noted that：Above example is merely to illustrate technical scheme rather than to its protection domain
Restriction, although being described in detail to the application with reference to above-described embodiment, those of ordinary skill in the art should
Understand：Those skilled in the art read the application after still can to apply specific embodiment carry out a variety of changes, modification or
Person's equivalent, but these changes, modification or equivalent, are applying within pending claims.
Claims (11)
1. a kind of flexible direct current line voltage administrative center, it is characterised in that the voltage management center includes that unidirectional current is voltage-controlled
The DC voltage control substation arranged in main website processed and current conversion station, the DC voltage control main website and DC voltage control substation
It is connected by high speed communication passage；It is voltage-controlled with unidirectional current by DC voltage control main website between the DC voltage control substation
High speed communication passage between system station is connected, and transmits mutually respective running state information；
The DC voltage control main website includes secondary voltage control system, and the DC voltage control substation includes a pressure regulation
Control system；
The DC voltage control substation is provided with DC voltage control main website standby station.
2. voltage management center as claimed in claim 1, it is characterised in that sending end current conversion station is stood erectly with generation of electricity by new energy and connects phase
Lian Shi, the DC voltage control substation of sending end current conversion station arrange new forms of energy unit association control system, the control system of new forms of energy unit association
Assist control of the system by new forms of energy unit, directly controls exerting oneself for generation of electricity by new energy.
3. voltage management center as claimed in claim 1, it is characterised in that institute's secondary voltage control system includes voltage
Stable high-speed optimization computing system, when direct current catastrophe failure causes current conversion station voltage pulsation to trigger secondary pressure regulation, precise control
Optimum current conversion station voltage.
4. voltage management center as claimed in claim 1, it is characterised in that DC voltage control main website standby station includes
Voltage control system and secondary voltage control system.
5. voltage management center as claimed in claim 1, it is characterised in that the DC voltage control main website and DC voltage
Control main website standby station is connected with flexible direct current power grid control protection private network respectively, receives flexible direct current power grid control protection private network
The flexible direct current electric network fault information of transmission.
6. voltage management center as claimed in claim 1, it is characterised in that the voltage management center is passed through with control centre
Communication system is connected with each other, and the real-time running state of flexible direct current electrical network is transmitted to control centre, and receives control centre
Control instruction.
7. voltage management center as claimed in claim 1, it is characterised in that control centre arranges the flexible direct current electrical network electricity
The current conversion station normal voltage range of operation and secondary pressure regulation triggering threshold value of pressure administrative center.
8. a kind of Voltage Stability Control method based on flexible direct current line voltage administrative center, it is characterised in that the voltage
Stable control method comprises the steps：
Step 1：According to the method for operation of flexible direct current electrical network, current conversion station normal voltage range of operation and flexible direct current electrical network are set
Secondary pressure regulation triggers threshold value；
Step 2：Flexible direct current power grid control protection private network judges whether to break down, if breaking down, into step 3, if not having
Break down, pressure regulation terminates；
Step 3：Judge whether voltage exceedes secondary pressure regulation and trigger threshold value, if voltage is less than secondary pressure regulation threshold value, each direct current
Voltage control sub-station adopts a pressure regulation；If voltage is more than secondary pressure regulation threshold value, DC voltage control main website adopts secondary tune
Pressure；
Step 4：Judge whether voltage exceedes normal voltage range of operation, if exceeding, return to step 3, if voltage returns to normal fortune
Line range, voltage-regulation terminate.
9. Voltage Stability Control method as claimed in claim 8 a, it is characterised in that pressure regulation is to there is poor tune in real time
Section, according to the voltage response of current conversion station, with the pressure regulation of DC voltage control substation.
10. Voltage Stability Control method as claimed in claim 8, it is characterised in that the secondary pressure regulation is that quick indifference is adjusted
Section, according to voltage stabilization high-speed optimization computing system, the accurate optimal voltage for calculating each current conversion station under failure condition, by direct current
Control instruction is assigned to DC voltage control substation by voltage control main website.
11. Voltage Stability Control methods as claimed in claim 8 a, it is characterised in that pressure regulation is equal with secondary pressure regulation
By controlling the power of current conversion station come control voltage.
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| CN201710060853.8A CN106684852B (en) | 2017-01-25 | 2017-01-25 | Flexible direct current power grid voltage management center and voltage stability control method thereof |
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| CN201710060853.8A CN106684852B (en) | 2017-01-25 | 2017-01-25 | Flexible direct current power grid voltage management center and voltage stability control method thereof |
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Cited By (3)
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| CN107342789A (en) * | 2017-06-20 | 2017-11-10 | 重庆渝丰鑫新线缆科技有限公司 | A kind of group-net communication method of cable anti-theft monitoring system |
| CN107346980A (en) * | 2017-06-20 | 2017-11-14 | 重庆渝丰鑫新线缆科技有限公司 | A kind of group-net communication method of more slave station cable anti-theft monitoring systems |
| CN114374645A (en) * | 2020-10-14 | 2022-04-19 | 中国南方电网有限责任公司超高压输电公司 | Inter-station communication data roundabout method for multiple converter stations |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342789A (en) * | 2017-06-20 | 2017-11-10 | 重庆渝丰鑫新线缆科技有限公司 | A kind of group-net communication method of cable anti-theft monitoring system |
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| CN107346980B (en) * | 2017-06-20 | 2020-11-03 | 重庆渝丰电线电缆有限公司 | Networking communication method of multi-slave-station cable anti-theft monitoring system |
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| CN114374645A (en) * | 2020-10-14 | 2022-04-19 | 中国南方电网有限责任公司超高压输电公司 | Inter-station communication data roundabout method for multiple converter stations |
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| Publication number | Publication date |
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| CN106684852B (en) | 2021-11-09 |
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