CN103633660B - A kind of segmented suppresses the method for AC overvoltage and overfrequency - Google Patents
A kind of segmented suppresses the method for AC overvoltage and overfrequency Download PDFInfo
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- CN103633660B CN103633660B CN201310610247.0A CN201310610247A CN103633660B CN 103633660 B CN103633660 B CN 103633660B CN 201310610247 A CN201310610247 A CN 201310610247A CN 103633660 B CN103633660 B CN 103633660B
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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 present invention is a kind of method that segmented suppresses AC overvoltage and overfrequency, and under specifically referring to that HVDC (High Voltage Direct Current) transmission system is in decoupled mode, a kind of segmented suppresses the method for AC overvoltage and overfrequency.The method changes former DC over-voltage protection, cut the drawback of machine protection high week; adopt segmented overvoltage, frequency decision logic; excise DC converter station group alternating current filter/capacitor when different delayed time or organize greatly alternating current filter/capacitor and Power Plant, different segmentations freely can be thrown and be moved back.Under the islet operation operating mode of different capacity level, different power plant start-up mode, the method all can ensure after failure removal, surplus equipment is normally run under being still in the system condition that design allows and is solved islanded system and to break down and after excising, AC system voltage and frequency exceed the problem of the scope that design allows, and ensure that the safe and reliable operation of surplus equipment in islanded system.
Description
Technical field
What the present invention relates to is a kind of method of technical field of power systems, and under specifically referring to that HVDC (High Voltage Direct Current) transmission system is in decoupled mode, a kind of segmented suppresses the method for AC overvoltage and overfrequency.
Background technology
Under HVDC (High Voltage Direct Current) transmission system is in decoupled mode, be support equipment safe operation, under AC and DC system fault conditions, by measures such as relaying protections, can isolated fault fast.After the excision AC and DC system failure, islanded system is less due to itself capacity, easily causes AC system overvoltage and frequency to surmount equipment normal range of operation, usually adopts overvoltage protection, high week cuts the relay protecting methods such as machine and solve.
Wherein overvoltage protection, high week cut machine and widely use in engineering, existing overvoltage protection, high week cut machine and all belong to element protection, all fail to ensure after the excision AC and DC system failure, the safety of all the other equipment of isolated island AC system.Former overvoltage protection principle: be the protection of a kind of direct current component; adopt multisection type principle, according to difference ac bus voltage being detected, take different delayed time action to export emergency outage DC transmission system; tripping AC service entrance switch, takes direct current system to safe condition.Former high week cuts machine protection philosophy: be a kind of stable control; Main Function is exactly (each local definite value is different) this device action when mains frequency is high time; excise part on this electrical network and send into power supply (transmission line as the electric energy of generator and feeding); cut machine according to change (>50Hz) the high week of mains frequency and be divided into a lot of wheel; the such as first round is 51.5Hz; second to take turns be 52.5Hz; third round is 53.5Hz; fourth round is 54.5Hz, ensures the safety of unit.
But in actual moving process; because the on-the-spot operating condition of islanded system is complicated; boundary conditions is relevant with power plant's start-up mode, direct current transmission power size, AC system impedance amount of capacity, DC control response characteristic and direct current system configuration mode; convention over-voltage and height week cut safety, the stable operation that machine protection effectively cannot ensure system after failure removal, and its object is only element protection but not insurance system.
Summary of the invention
The object of the invention is the method proposing a kind of segmented suppression AC overvoltage and overfrequency, the invention enables the direct current system be under decoupled mode, after the excision of the AC and DC system failure, islanded system can keep stable operation, alternating voltage, FREQUENCY CONTROL, in the scope of setting, make the equipment retained in islanded system still be in the range of operation of design.
The present invention is achieved by the following technical solutions, comprises the following steps:
Segmented of the present invention suppresses the method for AC overvoltage and overfrequency, comprises the following steps:
1) determine that direct current islet operation suppresses AC overvoltage Trip Logic, the out-of-limit Trip Logic of direct current islet operation blanketing frequency;
2) set up high voltage direct current electromagnetism Transient simulation model and power plant's electrical-magnetic model under decoupled mode, and AC overvoltage Trip Logic, the out-of-limit Trip Logic modeling of direct current islet operation blanketing frequency are suppressed to direct current islet operation; According to following setting principle, choose suitable conservation suggestion definite value;
3) according to fault simulation requirement, choose different operating conditions respectively, and simulate different faults operating mode.
4) perform electromagnetic transient simulation, observe measuring-signal curve, whether checking definite value is chosen reasonable.
Described setting principle is: 1) break down under different capacity level, different power plant start-up mode according to design standard analysis and excise rear system and can keep stable operation;
2) break down under different capacity level, different power plant start-up mode and after excising the overvoltage level of system in the scope that code is run;
3) break down under different capacity level, different power plant start-up mode and after excising the alternating current voltage frequency of system in the scope that code is run.
Compared with prior art, the invention has the beneficial effects as follows:
1) adopt method of the present invention, break down under different capacity level, different power plant start-up mode and after excising in isolated island surplus equipment still can keep normal operation, and be all in scope that design allows and run.
2) adopt method of the present invention, solve islanded system and to break down and after excising, AC system voltage and frequency exceed the problem of the scope that design allows, and ensure that the safe and reliable operation of surplus equipment in islanded system.
3) adopt method of the present invention, coordinated by the setting of segmented AC overvoltage control logic, segmented frequency control logic, guarantee that islanded system does not produce vibration after fault occurs.
4) method of the present invention is adopted, make to be in the direct current system under decoupled mode, after the excision of the AC and DC system failure, islanded system can keep stable operation, alternating voltage, FREQUENCY CONTROL are in the scope of setting, and the equipment retained in islanded system is still in the range of operation of design.
5) method of the present invention is adopted; change former DC over-voltage protection, cut the drawback of machine protection high week; adopt segmented voltage, frequency logic; excise DC converter station group alternating current filter/capacitor when different delayed time or organize greatly alternating current filter/capacitor and power plant unit, different segmentations freely can be thrown and be moved back.
accompanying drawing illustrates:
Fig. 1 is the schematic diagram of the bipolar operation of direct current isolated island;
Fig. 2 is the schematic diagram of the direct current isolated island one pole the earth mode of connection;
Fig. 3 is the schematic diagram of direct current isolated island one pole metal connection mode;
Fig. 4 is DC transmission system fault simulation schematic diagram;
Fig. 5 is that direct current islet operation suppresses AC overvoltage Trip Logic schematic diagram;
Fig. 6 is the out-of-limit Trip Logic schematic diagram of direct current islet operation blanketing frequency.
embodiment:
The present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Islet operation of the present invention is that sending end rectification side is not connected with AC system major network, but only being connected the mode of converting plant by alternating current circuit by one or several power plant, direct current islet operation is the same with networking operation also exists the operational modes such as bipolar, one pole the earth, one pole metal.The present embodiment is exactly under the different running method of direct current isolated island, simulates representative fault, studies and verifies that segmented suppresses the validity of AC overvoltage and overfrequency method.
The schematic diagram of the bipolar operation of direct current isolated island of the present invention as shown in Figure 1, in Fig. 1, DC transmission system adopts bipolar operation, utilizes positive and negative polarities wire to be connected with the positive and negative polarities of two ends current conversion station, form the closed loop of DC side, the equal ground connection of neutral point of two ends current conversion station.Power station A and power station B is connected to converting plant respectively by two and an alternating current circuit, and form islanded system, converting plant is configured with 18 group's alternating current filters, is divided into 4 large group.
As shown in Figure 2, in Fig. 2, DC transmission system adopts one pole the earth to run to the schematic diagram of the direct current isolated island one pole the earth mode of connection of the present invention, utilizes positive wire and the earth to form the one pole loop of DC side, the equal ground connection of neutral point of two ends current conversion station.Power station A and power station B is connected to converting plant respectively by two and an alternating current circuit, and form islanded system, in example, converting plant is configured with 18 group's alternating current filters, is divided into 4 large group.
The schematic diagram of direct current isolated island one pole metal connection mode of the present invention as shown in Figure 3, in Fig. 3, DC transmission system adopt monopolar metallic return run, utilize both positive and negative polarity wire form DC side one pole loop wherein negative pole be the metal line of return.Power station A and power station B is connected to converting plant respectively by two and an alternating current circuit, and form islanded system, in example, converting plant is configured with 18 group's alternating current filters, is divided into 4 large group.
DC transmission system fault simulation schematic diagram of the present invention as shown in Figure 4, in Fig. 4, IdCH is high voltage bus electric current, IdLH is DC line electric current, IdCN is neutral bus electric current, and fault point 1,4,5,7,9,13,16 represents the fault numbering of the different abort situation in alternating current-direct current side that the present invention chooses respectively.
The present invention changes former DC over-voltage protection, cut the drawback of machine protection high week; adopt segmented voltage logic; excise DC converter station group alternating current filter/capacitor when different delayed time or organize greatly alternating current filter/capacitor, different sections can allow to arrange input.Direct current islet operation suppresses AC overvoltage Trip Logic schematic diagram as shown in Figure 5: in Fig. 5, Uac_psf is the fundamental positive sequence of ac bus voltage, when detecting that this magnitude of voltage exceedes corresponding definite value and certain time Hou Fatiao group filter/capacitor or organize greatly filter/capacitor order.Wherein U △ 1-U △ 5 can adjust according to different DC engineering from △ t1-△ t8 and determine.Wherein U △ 1-U △ 3 is the voltage threshold value of excision group alternating current filter, △ t1-△ t3 is the time delay of 1 ~ 3 section of excision group alternating current filter, △ t6 is the inherent delay of excision group alternating current filter, and △ t7 is the interval time of excising group's alternating current filter successively; U △ 4-U △ 5 is the voltage threshold value of excision large group alternating current filter, and △ t8 sends the interval time that all alternating current filter switches of tripping and the tripping change of current become service entrance switch.
As shown in Figure 6, Frequency is AC system frequency to the out-of-limit Trip Logic schematic diagram of direct current islet operation blanketing frequency, when detecting that frequency values exceedes corresponding definite value and sends out the order of excision separate unit generating set after certain time.Wherein f △ 1-f △ 3 can determine according to different engineering turning from △ t11-△ t15.F △ 1-f △ 3 is the frequency threshold value of excision generating set, and t11-△ t13 is the time delay of 1 ~ 3 section of excision generating set, and t14 is the inherent delay of excision generating set, and t15 is the interval time of excising generating set successively.
Embodiment
In electrical-magnetic model,
1) build the direct current islanded system model comprising power plant, and to the detailed modeling of analogue system, meet the parameter request of system;
2) ac bus voltage, frequency is chosen as main observed quantity;
3) adjustable fault impedance and the model of duration are adopted to different faults point;
4) hvdc control mode adopts constant dc power control, and can adjust;
5) the direct current mode of connection can adopt bipolar, one pole the earth, one pole metal mode;
6) carry out simulation calculation to model, simulation time is according to system scale, and usually at about 100 seconds, the system of guarantee enters stable state;
7) after system enters stable state, trigger different faults point failure, observe after failure removal, suppress AC overvoltage, frequency policies action, ac bus voltage, frequency content;
Suppression AC overvoltage before and after record protection action, frequency policies action, ac bus voltage, frequency content.
Claims (1)
1. segmented suppresses a method for AC overvoltage and overfrequency, it is characterized in that comprising the following steps:.
1) determine that direct current islet operation suppresses AC overvoltage Trip Logic and the out-of-limit Trip Logic of direct current islet operation blanketing frequency;
2) set up high voltage direct current electromagnetism Transient simulation model and power plant's electrical-magnetic model under decoupled mode, and AC overvoltage Trip Logic and the out-of-limit Trip Logic modeling of direct current islet operation blanketing frequency are suppressed to direct current islet operation; According to following setting principle, choose suitable conservation suggestion definite value;
3) according to fault simulation requirement, choose different operating conditions respectively, and simulate different faults operating mode;
4) perform electromagnetic transient simulation, observe measuring-signal curve, whether checking definite value is chosen reasonable;
Above-mentioned direct current islet operation suppresses that AC overvoltage Trip Logic includes the setting value of tripping operation, tripping operation delay time is arranged, the object of tripping voltage threshold value and tripping operation, and the out-of-limit Trip Logic of direct current islet operation blanketing frequency includes the setting value of tripping operation, tripping operation delay time is arranged, the object of tripping frequency threshold value and tripping operation;
Described setting principle is: 1) break down under different capacity level and different power plant start-up mode according to design standard analysis and excise rear system and can keep stable operation;
2) break down under different capacity level and different power plant start-up mode and after excising the overvoltage level of system in the scope that code is run;
3) break down under different capacity level and different power plant start-up mode and after excising the alternating current voltage frequency of system in the scope that code is run.
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| CN108146261B (en) * | 2017-11-27 | 2021-03-16 | 国网北京市电力公司 | Fault protection method and device for electric vehicle rapid charging station |
| CN110932225B (en) * | 2019-10-29 | 2022-09-02 | 中国电力科学研究院有限公司 | Setting method and setting device for overvoltage protection of ultra/extra-high voltage alternating current circuit |
| CN110912206B (en) * | 2019-11-27 | 2023-04-14 | 深圳供电局有限公司 | Virtual power plant based power distribution network fault recovery power supply method and system |
Citations (3)
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| CN102403717A (en) * | 2011-11-18 | 2012-04-04 | 中国南方电网有限责任公司 | Method for evaluating severity of power system fault |
| CN103117565A (en) * | 2013-01-28 | 2013-05-22 | 南方电网科学研究院有限责任公司 | Analysis method for researching alternating current and direct current mutual influence mechanism |
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Patent Citations (3)
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| CN102360182A (en) * | 2011-09-14 | 2012-02-22 | 电子科技大学 | Method for carrying out simulation on operation of isolated island of wind-gas turbine hybrid power system |
| CN102403717A (en) * | 2011-11-18 | 2012-04-04 | 中国南方电网有限责任公司 | Method for evaluating severity of power system fault |
| CN103117565A (en) * | 2013-01-28 | 2013-05-22 | 南方电网科学研究院有限责任公司 | Analysis method for researching alternating current and direct current mutual influence mechanism |
Non-Patent Citations (1)
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| 云广特高压直流输电线路孤岛运行过电压及抑制;蔡汉生等;《高电压技术》;20091130;第35卷(第11期);第2634-2639页 * |
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Effective date of registration: 20210601 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China South Power Grid International Co.,Ltd. Address before: 510623 Guangdong city in Guangzhou Province, the Pearl River Metro Chinese Sui Road No. 6 Patentee before: POWER GRID TECHNOLOGY RESEARCH CENTER. CHINA SOUTHERN POWER GRID |
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