CN102636753B - Testing method of low-voltage ride through capability of fossil power plant auxiliary engine - Google Patents
Testing method of low-voltage ride through capability of fossil power plant auxiliary engine Download PDFInfo
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- CN102636753B CN102636753B CN201210149729.6A CN201210149729A CN102636753B CN 102636753 B CN102636753 B CN 102636753B CN 201210149729 A CN201210149729 A CN 201210149729A CN 102636753 B CN102636753 B CN 102636753B
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- 238000000034 method Methods 0.000 claims abstract description 10
- 238000010998 test method Methods 0.000 claims description 12
- 238000010977 unit operation Methods 0.000 claims description 5
- 230000005284 excitation Effects 0.000 abstract description 7
- 239000000843 powder Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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Abstract
The invention discloses a testing method of the low-voltage ride through capability of a fossil power plant auxiliary engine. The method is used for testing the low-voltage ride through capability of the fossil power plant auxiliary engine based on the excitation control of an excitation regulator. By reasonably arranging the operation mode of the plant, the method can be used for detecting whether the auxiliary engine can stay for more than 9 seconds through the 70% phase-step test of a generator excitation regulator so as to verify whether the auxiliary engine has the low-voltage ride through capability. The method provided by the invention can be used for rapidly detecting the low-voltage ride through capability of the fossil power plant auxiliary engine and deciding a corresponding improvement scheme according to the detecting result and has important significance for guaranteeing the safe and stable operation of the plant and a power grid.
Description
Technical field
The invention belongs to field of measuring technique, be specifically related to a kind of test method of the fired power generating unit subsidiary engine low voltage ride-through capability based on excitation control, for testing the low voltage ride-through capability of fired power generating unit subsidiary engine.
Background technology
Low voltage ride-through capability, former finger small power generation system can keep grid-connected in the time that grid-connected point voltage falls, and even provides certain reactive power to electrical network, supports power system restoration, until power system restoration is normal, thus the ability of " passing through " this low-voltage time.In recent years; there is the faults such as a lot of thunderbolts, electrical equipment short circuit, ground connection in thermal power plant; cause that electrical network and Station Service Electrical-Energy short time voltage reduce; cause the electrical source of power such as feed pump, machine supplying powder, pressure fan, coal pulverizer and control power supply low-voltage; part subsidiary engine low-voltage lockout protection action; cause subsidiary engine to quit work, thereby cause blowing out, stopping accident.This accident is called " fired power generating unit subsidiary engine does not possess low voltage ride-through capability ".Therefore in the urgent need to one easily test method judge whether subsidiary engine possesses low voltage ride-through capability.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of easy to operate, and can accurately verify whether fired power generating unit subsidiary engine possesses the test method of low voltage ride-through capability.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of test method of fired power generating unit subsidiary engine low voltage ride-through capability, and it comprises the following steps:
1) change the power plant equipment method of operation: make generator no-load running, extreme voltage keeps rated condition, rotating speed is 3000 revs/min, 6KV station-service A section is powered through HV Auxiliary Transformer by generator, institute's on-load is the fired power generating unit subsidiary engine that carries out low voltage ride-through capability test, 6KV station-service B section is by generator through opening the standby power supply that becomes, and institute's on-load is the necessary various loads of station-service;
2) carry out set end voltage 70% step test: first carry out lower step test, be down to 30% rated voltage by the field regulator control generator terminal voltage of generator by 100% rated voltage, and keep 30% rated voltage 9 seconds; If subsidiary engine can keep 30% rated voltage not trip in 9 seconds, judge that subsidiary engine possesses low voltage ride-through capability; If subsidiary engine tripped in 9 seconds, judge that subsidiary engine does not possess low voltage ride-through capability; Then carry out upper step test, rise to 100% rated voltage by field regulator controller terminal voltage by 30% rated voltage, recover unit operation operating mode.
Theoretical foundation of the present invention is: by automatic excitation adjustor of generator control generator terminal voltage, generator terminal voltage is lowered suddenly in short-term, the faults such as simulation thunderbolt, electrical equipment short circuit, ground connection, and then cause that the reduction of Station Service Electrical-Energy short time voltage makes subsidiary engine lower voltage, thereby whether checking subsidiary engine possesses low voltage ride-through capability.
The beneficial effect that adopts technique scheme to produce is: the present invention is on the basis of existing equipment, complete by changing the electric power factory equipment method of operation, test need not increase extra testing equipment, and can reach test objective, has higher economic worth; The present invention can effectively verify fired power generating unit subsidiary engine low voltage ride-through capability, and proposes prioritization scheme according to testing result, can further ensure fired power generating unit and power network safety operation, has important social effect.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention;
Fig. 2 is the automatic excitation adjustor of generator 70% step test record ripple figure of the embodiment of the present invention 1;
Wherein, 1, generator; 2, main-transformer; 3, HV Auxiliary Transformer; 4, bus connection switch; 5,6KV station-service A section; 6, start spare transformer; 7,6KV station-service B section; 8, the necessary various loads of station-service; 9, fired power generating unit subsidiary engine.
In Fig. 2, UAB is that generator terminal voltage, UFD are that field voltage, IFD are exciting current.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Referring to accompanying drawing 1, this test method comprises the following steps:
1) change the power plant equipment method of operation: make generator 1 no-load running, set end voltage keeps rated condition, rotating speed is 3000 revs/min, 6KV station-service A section 5 is powered through HV Auxiliary Transformer 3 by generator, institute's on-load is that the fired power generating unit subsidiary engine 9(that carries out low voltage ride-through capability test is subsidiary engine to be tested), 6KV station-service B section 7 is powered through starting spare transformer 6 by generator, and institute's on-load is the necessary various loads 8 of station-service, as feed pump, coal pulverizer etc.;
2) carry out set end voltage 70% step test: first carry out lower step test, be down to 30% rated voltage by the field regulator control generator terminal voltage of generator by 100% rated voltage, and keep 30% rated voltage 9 seconds; If fired power generating unit subsidiary engine 9 can keep 30% rated voltage not trip in 9 seconds, judge that it possesses low voltage ride-through capability; If subsidiary engine tripped in 9 seconds, judge that it does not possess low voltage ride-through capability; Then carry out upper step test, rise to 100% rated voltage by field regulator controller terminal voltage by 30% rated voltage, recover unit operation operating mode.
The present invention is a kind of test method of the fired power generating unit subsidiary engine low voltage ride-through capability based on excitation control, it is by field regulator control generator terminal voltage, generator terminal voltage is lowered suddenly in short-term, and then cause that the reduction of Station Service Electrical-Energy short time voltage makes subsidiary engine lower voltage, thereby whether checking subsidiary engine possesses low voltage ride-through capability.
In order to verify the accuracy of this implementation method, be two embodiment below:
Embodiment 1:
No. 1 machine of Hebei Hua electricity Lu Hua Thermal Power Co., Ltd, generator mark is QFSN-330-2, field regulator is that ABB AB of Switzerland produces UNITROL5000 type.Adopt test method of the present invention, reasonable arrangement unit operation mode, No. 1 machine supplying powder is carried out to low voltage crossing test, referring to accompanying drawing 2, it is WFLC type Portable electric quantity recorder analyser record curve line, No. 1 machine supplying powder can stable operation more than 9 seconds in 30% rated voltage as can be known from Figure, judges that thus this subsidiary engine possesses low voltage ride-through capability.Therefore known test method of the present invention can accurately be verified the subsidiary engine equipment that possesses low voltage ride-through capability.
Embodiment 2:
No. 12 units of Hebei Handan Thermal Power Plant, generator mark is QFSN-330-2, field regulator model is RCS9400.Adopt test method of the present invention, reasonable arrangement unit operation mode, carries out low voltage crossing test to No. 1 feed pump, proves that after tested No. 1 feed pump, in 30% rated voltage operation tripping operation afterwards in 2 seconds, judges that this subsidiary engine does not possess low voltage ride-through capability thus.So test method of the present invention can accurately be verified the subsidiary engine equipment that does not possess low voltage ride-through capability.
Claims (1)
1. a test method for fired power generating unit subsidiary engine low voltage ride-through capability, is characterized in that: comprise the following steps:
1) change the power plant equipment method of operation: make generator (1) no-load running, set end voltage keeps rated condition, rotating speed is 3000 revs/min, 6KV station-service A section (5) is powered through HV Auxiliary Transformer (3) by generator, institute's on-load is the fired power generating unit subsidiary engine (9) that carries out low voltage ride-through capability test, 6KV station-service B(7) section is by generator through starting spare transformer (6) power supply, and institute's on-load is the necessary various loads (8) of station-service;
2) carry out set end voltage 70% step test: first carry out lower step test, be down to 30% rated voltage by the field regulator control generator terminal voltage of generator by 100% rated voltage, and keep 30% rated voltage 9 seconds; If fired power generating unit subsidiary engine (9) can keep 30% rated voltage not trip in 9 seconds, judge that it possesses low voltage ride-through capability; If subsidiary engine tripped in 9 seconds, judge that it does not possess low voltage ride-through capability; Then carry out upper step test, rise to 100% rated voltage by field regulator controller terminal voltage by 30% rated voltage, recover unit operation operating mode.
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| CN201210149729.6A CN102636753B (en) | 2012-05-15 | 2012-05-15 | Testing method of low-voltage ride through capability of fossil power plant auxiliary engine |
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| CN102636753B true CN102636753B (en) | 2014-05-28 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104578154B (en) * | 2014-12-26 | 2017-11-03 | 上海新拓电力设备有限公司 | A kind of method of feeder low voltage crossing |
| CN104833879B (en) * | 2015-05-08 | 2018-05-15 | 国家电网公司 | A kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system |
| CN105022384A (en) * | 2015-07-01 | 2015-11-04 | 国家电网公司 | LVRT (Low Voltage Ride Through) closed-loop simulation test method of controller of high-voltage frequency converter of thermal plant |
| CN105334412A (en) * | 2015-10-13 | 2016-02-17 | 国网安徽省电力公司 | Auxiliary machine high/low voltage rid-through test method based on voltage disturbance generator |
| CN113125848B (en) * | 2021-03-10 | 2022-07-05 | 国家电网有限公司华东分部 | Method and system for measuring through electric quantity of power supply plant and method for settling electric quantity |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101882798A (en) * | 2010-06-18 | 2010-11-10 | 深圳市禾望电气有限公司 | LVRT test control device |
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| CN101881814B (en) * | 2010-06-25 | 2013-08-21 | 西安久和能源科技有限公司 | Novel megawatt wind generating set testing system and testing method thereof |
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| CN101882798A (en) * | 2010-06-18 | 2010-11-10 | 深圳市禾望电气有限公司 | LVRT test control device |
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