CN103633660A - Subsection type AC (alternating current) overvoltage and overfrequency restraining method - Google Patents
Subsection type AC (alternating current) overvoltage and overfrequency restraining method Download PDFInfo
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Abstract
The invention belongs to a subsection type AC (alternating current) overvoltage and overfrequency restraining method, in particular to a subsection type AC overvoltage and overfrequency restraining method when a high-voltage DC (direct current) power transmission system is positioned in an isolated island operation mode; the method overcomes the protecting defects of the original DC overvoltage protection and high-period generating tripping protection. A subsection type overvoltage and overfrequency judgment logic is adopted, a small group of AC filter/capacitor or a large group of AC filter/capacitor of a DC converter station and a power plant machine set under the conditions of different delays are cut off, and free switching on and switching off can be performed in different subsections. Under the work condition of the isolated island operation with different power levels and different power plant starting modes, the method can ensure that after the fault is cut off, rest equipment can still be positioned in the system conditions allowed by the design to normally operate, the problem that the voltage and frequency of an AC system exceed the allowable range of the design after the fault of the isolated island system is cut off is solved, and the safe and reliable operation of the rest equipment in the isolated island system is ensured.
Description
Technical field
What the present invention relates to is a kind of method of technical field of power systems, specifically refers to that HVDC (High Voltage Direct Current) transmission system is under decoupled mode, and a kind of segmented suppresses the method for AC overvoltage and overfrequency.
Background technology
HVDC (High Voltage Direct Current) transmission system, under decoupled mode, is support equipment safe operation, in AC and DC system failure situation, and by measures such as relaying protections, isolated fault fast.After the excision AC and DC system failure, islanded system, because itself capacity is less, easily causes that AC system overvoltage and frequency surmount equipment normal range of operation, conventionally adopts overvoltage protection, high week to cut the relay protecting methods such as machine and solve.
Wherein overvoltage protection, high week cut machine and are widely used in engineering, and 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 safety of all the other equipment of isolated island AC system.Former overvoltage protection principle: be a kind of direct current component protection; adopt multisection type principle, according to the difference that ac bus voltage detected, take different delayed time action outlet emergency outage DC transmission system; tripping AC service entrance switch, takes direct current system to safe condition.Former high week is cut 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; the part of excising on this electrical network is sent into power supply (as the transmission line of generator with the electric energy of sending into); according to high week of the variation of mains frequency (>50Hz), cut machine and be divided into a lot of wheels; for example the first round is 51.5Hz; second to take turns be 52.5Hz; third round is 53.5Hz; fourth round is 54.5Hz, guarantees 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; conventional overvoltage and cut organizational security high week and protect safety, the stable operation that cannot effectively guarantee system after failure removal, its object is only element protection but not insurance system.
Summary of the invention
The object of the invention is to propose a kind of method that segmented suppresses AC overvoltage and overfrequency, the invention enables 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, in the scope of setting, make the equipment that retains in islanded system still in the range of operation in 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 emulation model and power plant's electro-magnetic transient model under decoupled mode, and direct current islet operation is suppressed to AC overvoltage Trip Logic, the out-of-limit Trip Logic modeling of direct current islet operation blanketing frequency; According to following setting principle, choose suitable protection suggestion definite value;
3), according to fault simulation requirement, choose respectively different operating conditions, and simulate different faults operating mode.
4) carry out electromagnetic transient simulation, observe measuring-signal curve, whether checking definite value is chosen reasonable.
Described setting principle is: 1) according to design standard analysis, under different capacity level, different power plant start-up mode, break down and excise after system can keep stable operation;
2) under different capacity level, different power plant start-up mode, break down and excise after the overvoltage level of system in the scope of rules operations;
3) under different capacity level, different power plant start-up mode, break down and excise after the alternating current voltage frequency of system in the scope of rules operations.
Compared with prior art, the invention has the beneficial effects as follows:
1) adopt method of the present invention, under different capacity level, different power plant start-up mode, break down and excise after in isolated island surplus equipment still can keep normal operation, and move in the scope all allowing in design.
2) adopt method of the present invention, after having solved islanded system and breaking down and excise, AC system voltage and frequency exceed the problem of the scope that design allows, and have guaranteed the safe and reliable operation of surplus equipment in islanded system.
3) adopt method of the present invention, the setting by segmented AC overvoltage control logic, segmented Frequency Control Logic coordinates, and guarantees that islanded system does not produce vibration after fault occurs.
4) adopt method of the present invention, make 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 retaining in islanded system is still in the range of operation in design.
5) adopt method of the present invention; change former DC over-voltage protection, high week cut the drawback that organizational security protects; adopt segmented voltage, frequency logic; the in the situation that of different delayed time, excise DC converter station group alternating current filter/capacitor or organize greatly alternating current filter/capacitor and power plant unit, different segmentations can freely be thrown and move back.
accompanying drawing explanation:
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 take technical solution of the present invention under prerequisite, provided 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 by one or several power plant, by alternating current circuit, connecting the mode of converting plant, direct current islet operation is the same with networking operation also there is 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 are connected to converting plant by two and an alternating current circuit respectively, form islanded system, and converting plant disposes 18 group's alternating current filters, is divided into 4 large group.
As shown in Figure 2, in Fig. 2, DC transmission system adopts the operation of one pole the earth to the schematic diagram of the direct current isolated island one pole the earth mode of connection of the present invention, utilizes the one pole loop of positive wire and the earth formation DC side, the equal ground connection of neutral point of two ends current conversion station.Power station A and power station B are connected to converting plant by two and an alternating current circuit respectively, form islanded system, and in example, converting plant disposes 18 group's alternating current filters, is divided into 4 large group.
As shown in Figure 3, in Fig. 3, DC transmission system adopts monopolar metallic return operation to the schematic diagram of direct current isolated island one pole metal connection mode of the present invention, utilize one pole loop that both positive and negative polarity wire forms DC side wherein negative pole be the metal line of return.Power station A and power station B are connected to converting plant by two and an alternating current circuit respectively, form islanded system, and in example, converting plant disposes 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 respectively the fault numbering of the abort situation that alternating current-direct current side that the present invention chooses is different.
The present invention has changed former DC over-voltage protection, high week has cut the drawback that organizational security protects; adopt segmented voltage logic; the in the situation that of different delayed time, excise DC converter station group alternating current filter/capacitor 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 this magnitude of voltage being detected, surpasses corresponding definite value certain time Hou Fatiao group's filter/capacitor or organizes greatly the order of filter/capacitor.Wherein U △ 1-U △ 5 can adjust definite according to different DC engineering from △ t1-△ t8.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 for to excise the interval time of group's alternating current filter successively; U △ 4-U △ 5 is the voltage threshold value of the large group of excision alternating current filter, and △ t8 is the interval time of sending all alternating current filter switches of tripping and tripping change of current change 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 after frequency values surpasses corresponding definite value certain time, sends out the order of excision separate unit generating set.Wherein f △ 1-f △ 3 can adjust definite according to different engineerings 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 for to excise the interval time of generating set successively.
Embodiment
In electro-magnetic transient model,
1) build and comprise power plant at interior direct current islanded system model, and to the detailed modeling of analogue system, meet the parameter request of system;
2) choose ac bus voltage, frequency as main observed quantity;
3) different faults point is adopted to capable of regulating fault impedance and the model of duration;
4) hvdc control mode adopts and determines power control, and can adjust;
5) the direct current mode of connection can adopt bipolar, one pole the earth, one pole metal mode;
6) model is carried out to simulation calculation, simulation time is according to system scale, and about 100 seconds, the system of assurance enters stable state conventionally;
7) system enters after stable state, triggers different faults point failure, observes after failure removal, suppresses AC overvoltage, frequency policy action, ac bus voltage, frequency situation;
Inhibition AC overvoltage, frequency policy action before and after record protection action, ac bus voltage, frequency situation.
Claims (2)
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, the out-of-limit Trip Logic of direct current islet operation blanketing frequency;
2) set up high voltage direct current electromagnetism transient emulation model and power plant's electro-magnetic transient model under decoupled mode, and direct current islet operation is suppressed to AC overvoltage Trip Logic, the out-of-limit Trip Logic modeling of direct current islet operation blanketing frequency; According to following setting principle, choose suitable protection suggestion definite value;
3), according to fault simulation requirement, choose respectively different operating conditions, and simulate different faults operating mode;
4) carry out electromagnetic transient simulation, observe measuring-signal curve, whether checking definite value is chosen reasonable.
2. segmented according to claim 1 suppresses the method for AC overvoltage and overfrequency, it is characterized in that described setting principle is: 1) according to design standard analysis, under different capacity level, different power plant start-up mode, break down and excise after system can keep stable operation;
2) under different capacity level, different power plant start-up mode, break down and excise after the overvoltage level of system in the scope of rules operations;
3) under different capacity level, different power plant start-up mode, break down and excise after the alternating current voltage frequency of system in the scope of rules operations.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108146261A (en) * | 2017-11-27 | 2018-06-12 | 国网北京市电力公司 | The fault protecting method and device of electric vehicle rapid charging station |
| CN110912206A (en) * | 2019-11-27 | 2020-03-24 | 深圳供电局有限公司 | Virtual power plant based power distribution network fault recovery power supply method and system |
| CN110932225A (en) * | 2019-10-29 | 2020-03-27 | 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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)
| Title |
|---|
| 蔡汉生等: "云广特高压直流输电线路孤岛运行过电压及抑制", 《高电压技术》, vol. 35, no. 11, 30 November 2009 (2009-11-30), pages 2634 - 2639 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108146261A (en) * | 2017-11-27 | 2018-06-12 | 国网北京市电力公司 | The fault protecting method and device of electric vehicle rapid charging station |
| CN110932225A (en) * | 2019-10-29 | 2020-03-27 | 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 |
| CN110912206A (en) * | 2019-11-27 | 2020-03-24 | 深圳供电局有限公司 | Virtual power plant based power distribution network fault recovery power supply method and system |
| 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 |
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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 |