CN112615363B - Emergency coordination control method and system for dealing with multi-loop direct current blocking fault - Google Patents
Emergency coordination control method and system for dealing with multi-loop direct current blocking fault Download PDFInfo
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- CN112615363B CN112615363B CN202011356756.1A CN202011356756A CN112615363B CN 112615363 B CN112615363 B CN 112615363B CN 202011356756 A CN202011356756 A CN 202011356756A CN 112615363 B CN112615363 B CN 112615363B
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- 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]
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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
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- 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 discloses an emergency coordination control method and system for dealing with multi-loop direct current blocking faults, wherein basic power grid information is obtained, and undercontrol quantity which can meet the safety and stability of a power system and can be borne by the system under the condition of the multi-loop direct current simultaneous or sequential blocking faults is obtained according to time domain simulation software; calculating the additional control resource quantity overlapped by the control measures after the simultaneous or sequential locking faults of the multiple loops of direct current; establishing an extended control resource pool considering simultaneous or sequential locking faults under the condition of multi-loop direct current maximum power; the extended control resource pool includes: a single direct current control resource and an appendable control resource; and calculating the emergency additional control quantity according to the direct current operating power, the undercontrol quantity and the total real-time safety control action quantity, adding the corresponding control resource according to the extended control resource pool, and issuing the control resource to the direct current cooperative control master station for execution. The stability problem caused by multi-circuit high-power direct current locking can be effectively prevented.
Description
Technical Field
The invention belongs to the technical field of power systems and automation thereof, and particularly relates to an emergency coordination control method and system for handling multi-loop direct current blocking faults.
Background
Because the load center and the energy distribution in China present a serious imbalance phenomenon, the rapid development of the extra-high voltage direct current effectively relieves the contradiction, and plays an important role in realizing the large-scale optimal allocation of resources in China. However, as the economic development enters a new normal state, under the background of slow load growth, the load center is continuously fed with extra-high voltage direct current, the direct current cross-district access scale of the receiving-end power grid is continuously increased, and the contradiction of strong direct current and weak direct current is increasingly prominent. The single or multiple-circuit direct current blocking fault causes high-power tide transfer, and easily induces the alternating current connecting line to exceed a static stability limit, so that a receiving end power grid is disconnected with a main grid, and the safe operation of the power grid faces a large risk.
In order to ensure the safe operation of the large power grid in the transition period, innovative ideas are urgently needed, a protection control technology with high reliability and high safety is researched, and a large power grid safety comprehensive defense system is constructed. The existing safety control measures only deal with the fault impact after single direct current locking, but with the increase of the number of direct current feed-ins, particularly the increase of direct currents of sending ends in the same geographical position and receiving ends in the same geographical position, the risk of simultaneous faults of multiple direct currents is further increased, and even if the respective safety control measures act correctly, the system still has the problem of insufficient measure quantity. In order to deal with the risk faced by the system, the whole network control resource must be planned, and the prevention and control measures must be excavated, so as to improve the defense capability of the system.
Disclosure of Invention
The invention aims to: the invention provides an emergency coordination control method and system for dealing with multi-loop direct current blocking faults, and solves the problem of instability caused by multi-loop direct current blocking.
The technical scheme of the invention is as follows: an emergency coordination control method for dealing with multi-circuit direct current blocking faults is characterized by comprising the following steps:
acquiring basic power grid information, and acquiring an undercontrolled quantity P which can be borne by a system under the condition of multiple direct current simultaneous or sequential latching faults and meets the safety and stability of a power system according to time domain simulation software 1 ；
Calculating additional control resource amount P for overlapping control measures after simultaneous or sequential multiple-circuit DC blocking faults Heavy load ；
Establishing an extended control resource pool considering simultaneous or sequential locking faults under the condition of multi-loop direct current maximum power; the extended control resource pool includes: a single direct current control resource and an appendable control resource;
according to the DC running power and the undercontrolled quantity P 1 And real-time safety control action total P Safety control Calculating an urgent additional control amount P Adding And adding corresponding control resources according to the extended control resource pool, and sending the control resources to the direct-current cooperative control master station for execution.
Further, the basic grid information includes: electromechanical transient simulation data, an expected fault set, control resources, a single direct current blocking off-line control strategy, a power grid operation mode and a power system safe and stable operation boundary;
the set of expected failures includes: any combination of multiple direct current blocking faults;
the control resources include: direct current controllable resources and load controllable resources;
the single direct current blocking off-line control strategy comprises modulating direct current and load shedding;
the undercontrol quantity is the maximum power shortage which can be borne by the safe and stable operation of the power system.
Further, based on each single direct current offline control strategy, calculating an additional control resource amount P aiming at control resource shortage after multiple direct current simultaneous or sequential lockout faults possibly caused by control measure overlapping for each direct current Heavy load 。
Further, the total amount of control resources in the control resource pool is the total amount of power corresponding to each dc fault + the additional amount of control resources P corresponding to each dc fault Heavy load Under-control quantity P for safety and stability of electric power system 1 ，
Wherein m is the number of DC latches, P Direct current i And corresponding operating power for the ith latching direct current fault.
Further, the emergency additional control amount P Adding The calculation formula is as follows:
wherein m is the number of DC latches, P Direct current i Operating power corresponding to the ith latching direct current fault; p Safety control The total amount of safety control actions after the direct current fault sent by each direct current control main station.
An emergency coordinated control system for handling multiple-circuit dc blocking faults, comprising:
the off-line calculation module is used for acquiring basic power grid information and obtaining the undercontrol quantity P which can be borne by the system under the condition of simultaneous or sequential locking faults of multiple loops of direct current and meets the safety and stability of the power system according to time domain simulation software 1 (ii) a Calculating additional control resource amount P for overlapping control measures after simultaneous or sequential multiple-circuit DC blocking faults Heavy load (ii) a Establishing an extended control resource pool considering simultaneous or sequential locking faults under the condition of multi-loop direct current maximum power; the extended control resource pool includes: a single direct current control resource and an appendable control resource;
an on-line computation module for calculating the power and the undercontrol quantity P according to the DC running power 1 And real-time safety control action total P Safety control Calculating an urgent additional control amount P Adding And adding corresponding control resources according to the extended control resource pool, and sending the control resources to the direct-current cooperative control master station for execution.
Further, the basic grid information includes: electromechanical transient simulation data, an expected fault set, control resources, a single direct current blocking off-line control strategy, a power grid operation mode and a power system safe and stable operation boundary;
the set of expected failures includes: any combination of multiple direct current blocking faults;
the control resources include: direct current controllable resources and load controllable resources;
the single direct current blocking off-line control strategy comprises modulating direct current and load shedding;
the undercontrol quantity is the maximum power shortage which can be borne by the safe and stable operation of the power system.
Further, based on each single direct current offline control strategy, calculating an additional control resource amount P aiming at control resource shortage after multiple direct current simultaneous or sequential lockout faults possibly caused by control measure overlapping for each direct current Heavy load 。
Further, the total amount of control resources in the control resource pool is the total amount of power corresponding to each dc fault + the additional amount of control resources P corresponding to each dc fault Heavy load Under-control quantity P for safety and stability of electric power system 1 ，
Wherein m is the number of DC latches, P Direct current i And corresponding operating power for the ith latching direct current fault.
Further, the emergency additional control amount P Adding The calculation formula is as follows:
wherein m is the number of DC latches, P Direct current i Operating power corresponding to the ith latching direct current fault; p Safety control The total amount of safety control actions after the direct current fault sent by each direct current control main station.
The invention has the beneficial effects that:
the invention fully considers the risk of direct current fault faced by a receiving-end power grid along with the rapid development of high-power ultrahigh voltage direct current, and only adopts respective safety control when multiple loops of direct current simultaneously have faults, thereby having the problem of overlapping measure quantity. According to the invention, by establishing the extended control resource pool considering simultaneous or sequential locking faults under the maximum power of multiple loops of direct currents, the operation risk of the system after multiple loops of direct currents are failed is avoided, the multiple direct current emergency cooperative control master station is added to calculate the control resource amount switching amount based on the safety control correct action in real time, and the stability problem caused by locking of the multiple loops of high-power direct currents can be effectively prevented.
Drawings
FIG. 1 is a flowchart of a control method according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1:
as shown in fig. 1, an emergency coordination control method for handling multiple-circuit dc blocking faults includes the steps of:
step 1, acquiring basic power grid information, and analyzing an undercontrolled quantity P which can meet the safety and stability of a power system and can be borne by the system under the condition of simultaneous or sequential locking faults of multiple loops of direct current according to time domain simulation software 1 。
The basic grid information includes: electromechanical transient simulation data, an expected fault set, control resources, a single direct current blocking off-line control strategy, a power grid operation mode and a power system safe and stable operation boundary;
the set of expected failures includes: any combination of multiple direct current blocking faults;
the control resources include: direct current controllable resources and load controllable resources;
the single direct current lockout offline control strategy is as follows: the safety control strategy of the direct current comprises modulating the direct current and cutting load;
the undercontrol amount refers to: the maximum power shortage which can be borne by the safe and stable operation of the power system is met; under the isolated network mode, under-control quantity P which can be borne by a multi-loop direct current simultaneous or sequential locking fault system and meets the safety and stability of the power system is calculated through time domain simulation software 1 ；
Step 2, calculating the additional control resource quantity P overlapped by the control measures after the simultaneous or sequential locking faults of the multiple loops of direct current Heavy load ；
Based on each single direct current offline control strategy, calculating an additional control resource amount P aiming at control resource shortage after multiple direct currents are simultaneously or successively locked and failed due to control measure overlapping of each direct current Heavy load 。
And 3, establishing an extended control resource pool considering simultaneous or sequential locking faults under the condition of multi-loop direct current maximum power.
The extended control resource pool includes: the total control amount of the control resource pool is the total power amount corresponding to each direct current fault plus the additional control resource amount P corresponding to each direct current fault Heavy load Under-control quantity P for safety and stability of electric power system 1 . That is to say that the first and second electrodes,
wherein m is the number of DC latches, P Direct current i Operating power corresponding to the ith latching direct current fault;
step 4, calculating the emergency additional control quantity P based on the real-time safety control action information Adding And adding corresponding control resources, namely adding modulation direct current or load shedding according to the extended control resource pool.
The method specifically comprises the following steps:
the real-time security control action information comprises the following steps: the method comprises the steps of modulating information and load shedding information by direct current power, monitoring direct current running power, fault information and running information of control resources of a control resource pool through a plurality of direct current emergency auxiliary control master stations, and sending total safety control action P after direct current fault on each direct current control master station Safety control Calculating an urgent additional control amount P Adding ；
P Adding Less than the total control amount of the control resource pool.
Step 5, issuing an emergency additional control quantity command by the multi-direct-current emergency auxiliary control master station, and executing the command by each direct-current auxiliary control master station;
each direct-current cooperative control master station is responsible for uploading direct-current fault information, loss power quantity, direct-current liftable power, direct-current retractable power and load-cutting information and receiving additional control quantity commands sent by the multiple direct-current emergency cooperative control master stations.
Example 2:
an emergency coordinated control system for handling multiple-circuit dc blocking faults, comprising:
the off-line calculation module is used for acquiring basic power grid information and obtaining the undercontrol quantity P which can meet the safety and stability of the power system and can be borne by the system under the condition of simultaneous or sequential locking faults of multiple loops of direct current according to time domain simulation software 1 (ii) a After calculating the simultaneous or sequential multiple-circuit DC blocking faults, cause controlAdditional control resource amount P with overlapping control measures Heavy load (ii) a Establishing an extended control resource pool considering simultaneous or sequential locking faults under the condition of multi-loop direct current maximum power; the extended control resource pool includes: a single direct current control resource and an appendable control resource;
an on-line computation module for calculating the power and the undercontrol quantity P according to the DC running power 1 And real-time safety control action total P Security control Calculating an urgent additional control amount P Adding And adding corresponding control resources according to the extended control resource pool, and sending the control resources to the direct-current cooperative control master station for execution.
Further, the basic grid information includes: electromechanical transient simulation data, an expected fault set, control resources, a single direct current blocking off-line control strategy, a power grid operation mode and a power system safe and stable operation boundary;
the set of expected failures includes: any combination of multiple direct current blocking faults;
the control resources include: direct current controllable resources and load controllable resources;
the single direct current blocking off-line control strategy comprises modulating direct current and load shedding;
the undercontrol quantity is the maximum power shortage which can be borne by the safe and stable operation of the power system.
Further, based on each single direct current offline control strategy, calculating an additional control resource amount P aiming at control resource shortage after multiple direct current simultaneous or sequential lockout faults possibly caused by control measure overlapping for each direct current Heavy load 。
Further, the total amount of control resources in the control resource pool is the total amount of power corresponding to each dc fault + the additional amount of control resources P corresponding to each dc fault Heavy load Under-control quantity P for safety and stability of electric power system 1 ，
Wherein m is the number of DC latches, P Direct current i Latching DC fault pairs for ithPower should be run.
Further, the emergency additional control amount P Adding The calculation formula is as follows:
wherein m is the number of DC latches, P Direct current i Operating power corresponding to the ith latching direct current fault; p Safety control The total amount of safety control actions after the direct current fault sent by each direct current control main station.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An emergency coordination control method for dealing with multi-circuit direct current blocking faults is characterized by comprising the following steps:
acquiring basic power grid information, and acquiring an undercontrolled quantity P which can be borne by a system under the condition of multiple direct current simultaneous or sequential latching faults and meets the safety and stability of a power system according to time domain simulation software 1 ；
Calculating additional control resource amount P for overlapping control measures after simultaneous or sequential multiple-circuit DC blocking faults Heavy load ；
Establishing an extended control resource pool considering simultaneous or sequential locking faults under the condition of multi-loop direct current maximum power; the extended control resource pool includes: a single direct current control resource and an appendable control resource;
according to the DC running power and the undercontrolled quantity P 1 And real-time safety control action total P Safety control Calculating an urgent additional control amount P Adding And adding corresponding control resources according to the extended control resource pool, and sending the control resources to the direct-current cooperative control master station for execution.
2. An emergency coordinated control method for dealing with multiple-circuit dc blocking fault according to claim 1, wherein said basic grid information includes: electromechanical transient simulation data, an expected fault set, control resources, a single direct current blocking off-line control strategy, a power grid operation mode and a power system safe and stable operation boundary;
the set of expected failures includes: any combination of multiple direct current blocking faults;
the control resources include: direct current controllable resources and load controllable resources;
the single direct current blocking off-line control strategy comprises modulating direct current and load shedding;
the undercontrol quantity is the maximum power shortage which can be borne by the safe and stable operation of the power system.
3. The method as claimed in claim 1, wherein the additional control resource amount P for the control resource shortage after the simultaneous or sequential multiple-loop dc blocking failure caused by the overlapping control measures for each dc is calculated based on each single dc off-line control strategy Heavy load 。
4. An emergency coordination control method for handling multiple-pass dc blocking fault according to claim 1, wherein the total control resource pool control amount is total power amount corresponding to each dc fault + additional control resource amount P corresponding to each dc fault Heavy load Under-control quantity P for safety and stability of electric power system 1 ，
Wherein m is the number of DC latches, P Direct current i And corresponding operating power for the ith latching direct current fault.
5. An emergency coordination control method for handling multiple-circuit dc blocking fault according to claim 1, characterized in thatThen, the emergency additional control amount P Adding The calculation formula is as follows:
wherein m is the number of DC latches, P Direct current i Operating power corresponding to the ith latching direct current fault; p Safety control The total amount of safety control actions after the direct current fault sent by each direct current control main station.
6. An emergency coordinated control system for handling multiple-circuit dc blocking faults, comprising:
the off-line calculation module is used for acquiring basic power grid information and obtaining the undercontrol quantity P which can meet the safety and stability of the power system and can be borne by the system under the condition of simultaneous or sequential locking faults of multiple loops of direct current according to time domain simulation software 1 (ii) a Calculating additional control resource amount P for overlapping control measures after simultaneous or sequential multiple-circuit DC blocking faults Heavy load (ii) a Establishing an extended control resource pool considering simultaneous or sequential locking faults under the condition of multi-loop direct current maximum power; the extended control resource pool includes: a single direct current control resource and an appendable control resource;
an on-line computation module for calculating the power and the undercontrol quantity P according to the DC running power 1 And real-time safety control action total P Safety control Calculating an urgent additional control amount P Adding And adding corresponding control resources according to the extended control resource pool, and sending the control resources to the direct-current cooperative control master station for execution.
7. An emergency coordinated control system for handling multiple-circuit dc blocking fault according to claim 6, wherein said base grid information comprises: electromechanical transient simulation data, an expected fault set, control resources, a single direct current blocking off-line control strategy, a power grid operation mode and a power system safe and stable operation boundary;
the set of expected failures includes: any combination of multiple direct current blocking faults;
the control resources include: direct current controllable resources and load controllable resources;
the single direct current blocking off-line control strategy comprises modulation direct current and load shedding;
the undercontrol quantity is the maximum power shortage which can be borne by the safe and stable operation of the power system.
8. The system according to claim 6, wherein the additional control resource amount P for the control resource shortage after the simultaneous or sequential multiple-DC lockout failure caused by the overlapping of the control measures for each DC is calculated based on each single DC offline control strategy Heavy load 。
9. An emergency coordination control system for handling multiple-pass dc blocking fault according to claim 6, wherein the total control resource pool control amount is total power amount corresponding to each dc fault + additional control resource amount P corresponding to each dc fault Heavy load Under-control quantity P for safety and stability of electric power system 1 ，
Wherein m is the number of DC latches, P Direct current i And corresponding operating power for the ith latching direct current fault.
10. The system according to claim 6, wherein the emergency additional control quantity P is an emergency additional control quantity Adding The calculation formula is as follows:
wherein m is the number of DC latches, P Direct current i For the i-th bar blocking DCOperating power corresponding to the barrier; p Safety control The total amount of safety control actions after the direct current fault sent by each direct current control main station.
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| CN107919671A (en) * | 2017-10-18 | 2018-04-17 | 中国电力科学研究院有限公司 | Multi-infeed DC regional power grid frequency urgent control Strategy Simulation method and its system |
| CN108879733A (en) * | 2018-08-06 | 2018-11-23 | 南瑞集团有限公司 | A kind of control method for coordinating improving mains frequency stability after direct current is latched |
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| CN107919671A (en) * | 2017-10-18 | 2018-04-17 | 中国电力科学研究院有限公司 | Multi-infeed DC regional power grid frequency urgent control Strategy Simulation method and its system |
| CN108879733A (en) * | 2018-08-06 | 2018-11-23 | 南瑞集团有限公司 | A kind of control method for coordinating improving mains frequency stability after direct current is latched |
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