CN101453121B - Low voltage deloading system for urban electric grid - Google Patents
Low voltage deloading system for urban electric grid Download PDFInfo
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- CN101453121B CN101453121B CN2007101715016A CN200710171501A CN101453121B CN 101453121 B CN101453121 B CN 101453121B CN 2007101715016 A CN2007101715016 A CN 2007101715016A CN 200710171501 A CN200710171501 A CN 200710171501A CN 101453121 B CN101453121 B CN 101453121B
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- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000012958 reprocessing Methods 0.000 claims description 2
- 238000002407 reforming Methods 0.000 abstract 1
- 230000003111 delayed effect Effects 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention discloses a metropolitan power network low-voltage load-shedding system, which comprises a converting station. The converting station comprises a monitoring system of the converting station and a main connection part of the converting station, wherein the main connection part of the converting station comprises a 35KV bus, a transformer and a 220KV or 110KV bus which are connected in sequence and are connected in parallel with a plurality of circuit loads. The converting station is characterized by comprising a low-voltage load-shedding device, wherein the low-voltage load-shedding device is connected with a voltage transformator to detect voltage of the 220KV or 110KV bus and calculate and process the voltage; and the low-voltage load-shedding device outputs signals for thecircuit load of the 35KV bus and the monitoring system of the converting station respectively to monitor operation and action situations of the low-voltage load-shedding device. The system is provided with the low-voltage load-shedding device through a reforming design, realizes low-voltage load rejection function of the converting station, guarantees safe and stable operation of the metropolitanpower network, protects the system from voltage collapse, and avoids occurrence of large-scale outage accidents.
Description
Technical field
The present invention relates to field of power, relate in particular to a kind of low voltage deloading system for urban electric grid.
Technical background
Urban distribution network generally all is a receiving-end system, and the topmost characteristics of receiving-end system are that load needs the remote input outside distinguishing by superhigh pressure interchange or DC line greatly, in order to support voltage, the local a large amount of reactive-load compensation equipment of installation that needs.For the consideration of cost of investment, actual greatly in these reactive-load compensation equipments is exactly capacitor.When certain disturbance makes the idle deficiency of receiving end electrical network, when voltage descends, the reactive power that capacitor provided but reduces rapidly with the quadratic form of voltage, causes voltage further to reduce, and this makes big load center be easier to occur the problem of idle enabling capabilities deficiency.The idle enabling capabilities deficiency of big load center electrical network will have a strong impact on the safe and stable operation of electric power system, cause system's generation voltage collapse accident, may cause the large-area power-cuts of electrical network, even may cause wider power failure on a large scale by zone of influence external power grid.For example Shanghai Power Network is through for many years sustained and rapid development, receiving end electrical network feature is constantly strengthened, during peak load, lack enough reserve capacitys, more can not satisfy the reasonable distribution requirement of big interval reserve capacity, Shanghai Power Network lacks enough dynamic reactive power supplys, and existing reactive power source also distributes inequality, and the especially yellow enough dynamic reactive regulating measures of subregion shortage of crossing of some subregions are brought out voltage easily and stablized accident.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, and a kind of low voltage deloading system for urban electric grid is provided, ensure the safe and stable operation of big city electrical network, anti-locking system generation voltage collapse is avoided the generation of large area blackout.
The technical scheme that realizes above-mentioned purpose is: a kind of low voltage deloading system for urban electric grid, comprise transformer station, this transformer station comprises monitoring system of electric substation and transformer station's main electrical scheme part, described transformer station main electrical scheme partly comprises the 35KV bus that is parallel with a plurality of line loads that connects successively, transformer and 220KV or 110KV bus, wherein, also comprise a low pressure load-shedding equipment, this low pressure load-shedding equipment links to each other with a voltage transformer and detects the voltage of 220KV or 110KV bus, and this voltage is calculated and handles, and this low pressure load-shedding equipment also outputs signal to the line load of 35KV bus and monitoring system of electric substation respectively to monitor the operation and the action situation of low pressure load-shedding equipment.
Above-mentioned big city electrical network low-voltage off-load system, wherein, described low pressure load-shedding equipment detects the positive sequence voltage of 220KV or 110KV bus by voltage transformer.
Above-mentioned big city electrical network low-voltage off-load system, wherein, described low pressure load-shedding equipment calculates reprocessing with the voltage process of voltage 220KV or 110KV bus, this processing comprises: if this voltage satisfies the cutting load condition, then the low pressure load-shedding equipment sends actuating signal, excises the line load on the corresponding 35KV bus.
The low pressure off-load system of above-mentioned big city electrical network, wherein, this low pressure off-load system is adapted to the operational mode of the different bus wiring of transformer station.
The invention has the beneficial effects as follows: the present invention has added the low pressure load-shedding equipment through transforming on original transformer station basis, realized the low-voltage cutting load function of transformer station, ensure the safe and stable operation of big city electrical network, anti-locking system generation voltage collapse is avoided the generation of large area blackout.
Low pressure off-load system as electric power system " three lines of defence " is a kind of effective correction control measure that solve power system voltage collapse accident, when having disturbance and voltage drop, system is low to moderate some preset time, the action of low pressure load-shedding equipment, cut-out power consumer load, so that voltage is stable or return to normal level, keep the continuation safe and stable operation of electric power system.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also Fig. 1, there is shown a kind of low voltage deloading system for urban electric grid of the present invention, comprise transformer station 1, this transformer station 1 comprises monitoring system of electric substation 11 and transformer station's main electrical scheme part 12, transformer station's main electrical scheme part 12 comprises the 35KV bus 121 that is parallel with a plurality of line loads 122 that connects successively, transformer 123 and 220KV or 110KV bus 124, also comprise a low pressure load-shedding equipment 2, this low pressure load-shedding equipment 2 links to each other with a voltage transformer 21 and detects the positive sequence voltage of 220KV or 110KV bus 124, and this voltage is calculated and handles, this processing comprises: if this voltage satisfies the cutting load condition, then the low pressure load-shedding equipment sends actuating signal, excise the line load on the corresponding 35KV bus, this low pressure load-shedding equipment 2 also outputs signal to the line load 122 of 35KV bus 121 and monitoring system of electric substation 11 respectively to monitor the operation and the action situation of low pressure load-shedding equipment.But when system was short-circuited fault, busbar voltage reduced suddenly, and when voltage change ratio was excessive, low pressure load-shedding equipment 2 locking was immediately no longer carried out low-voltage and judged; And behind protection action excision fault element, the voltage that installs 2 installation places gos up rapidly, if recover less than normal numerical value; but when recovering definite value greater than voltage behind the failure removal; then install 2 unlockings immediately, allow device 2 loads of excision respective numbers fast, voltage is recovered.
In the present embodiment, the setting value of low pressure load-shedding equipment 2 is: the round of low pressure off-load is 3 to take turns, and the 1st takes turns definite value 0.9U
N, delayed time 5 seconds; The 2nd takes turns definite value 0.85U
N, delayed time 2 seconds; The 3rd takes turns definite value 0.80U
N, delayed time 0.5 second; Voltage slippage dU/dt 〉=0.8U
NThe time locking low pressure load-shedding equipment, corresponding recovery voltage is 0.7U
N, and delayed time 6 seconds.Low pressure load-shedding equipment 2 can adopt UFV-202A frequency and voltage emergency control equipment or the UFV-2A frequency and voltage emergency control equipment of Chuzhou Li Hua Electronics Co., Ltd. or the YPZ-1 microcomputer electric voltage frequency intelligence controlling device of Shanghai Hailan Electric Co., Ltd. of the RCS-994A type frequency and voltage emergency control equipment of the SSE520 frequency and voltage emergency control equipment of the southern automation of state electricity limited company or Nari Jibao Electric Co., Ltd or Chuzhou positive magnificent Electric Power Automation Equipment company.
Above embodiment is only for the usefulness that the present invention is described, but not limiting the scope of the invention.Relevant those skilled in the art under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification, and the technical scheme that all are equal to also should belong within the category of the present invention's protection, is limited by each claim.
Claims (1)
1. low voltage deloading system for urban electric grid, comprise transformer station, this transformer station comprises monitoring system of electric substation and transformer station's main electrical scheme part, described transformer station main electrical scheme partly comprises the 35KV bus that is parallel with a plurality of line loads that connects successively, transformer and 220KV or 110KV bus, it is characterized in that, also comprise a low pressure load-shedding equipment, this low pressure load-shedding equipment links to each other with a voltage transformer and detects the voltage of 220KV or 110KV bus, and this voltage is calculated and handles, and this low pressure load-shedding equipment also outputs signal to the line load of 35KV bus and monitoring system of electric substation respectively to monitor the operation and the action situation of low pressure load-shedding equipment;
Described low pressure load-shedding equipment detects the positive sequence voltage of 220KV or 110KV bus by voltage transformer;
Described low pressure load-shedding equipment calculates reprocessing with the voltage process of voltage 220KV or 110KV bus, and this processing comprises: if this voltage satisfies the cutting load condition, then the low pressure load-shedding equipment sends actuating signal, excises the line load on the corresponding 35KV bus;
This low pressure off-load system is adapted to the operational mode of the different bus wiring of transformer station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101715016A CN101453121B (en) | 2007-11-30 | 2007-11-30 | Low voltage deloading system for urban electric grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101715016A CN101453121B (en) | 2007-11-30 | 2007-11-30 | Low voltage deloading system for urban electric grid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101453121A CN101453121A (en) | 2009-06-10 |
| CN101453121B true CN101453121B (en) | 2011-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101715016A Active CN101453121B (en) | 2007-11-30 | 2007-11-30 | Low voltage deloading system for urban electric grid |
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| Country | Link |
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| CN (1) | CN101453121B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023037A (en) * | 2012-11-19 | 2013-04-03 | 中国电力科学研究院 | Method and system for solving voltage instability of grid power at receiving end through direct-current delay interlocking |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354987B (en) * | 2011-09-28 | 2013-11-13 | 南京南瑞继保电气有限公司 | Control method of overload load-shedding for transformer or circuit |
| CN102709916B (en) * | 2012-05-24 | 2014-04-23 | 浙江大学 | Low-voltage load cutting method of electric system |
| CN111555290B (en) * | 2020-04-24 | 2022-07-22 | 南京南瑞继保电气有限公司 | Transformer substation is with combined type low pressure deloading system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1051829A (en) * | 1990-12-18 | 1991-05-29 | 鞍山电业局 | A kind of novel low-frequency rapid unloading device |
| CN1426149A (en) * | 2001-12-17 | 2003-06-25 | 秦明亮 | Automatic low frequency (low voltage) load reducing control new mode and its synchronizing calculation method |
-
2007
- 2007-11-30 CN CN2007101715016A patent/CN101453121B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1051829A (en) * | 1990-12-18 | 1991-05-29 | 鞍山电业局 | A kind of novel low-frequency rapid unloading device |
| CN1426149A (en) * | 2001-12-17 | 2003-06-25 | 秦明亮 | Automatic low frequency (low voltage) load reducing control new mode and its synchronizing calculation method |
Non-Patent Citations (1)
| Title |
|---|
| 邢国华,乔卫东.低压减载方案研究综述.《华东电力》.2005,第33卷(第12期),23-26. * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023037A (en) * | 2012-11-19 | 2013-04-03 | 中国电力科学研究院 | Method and system for solving voltage instability of grid power at receiving end through direct-current delay interlocking |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101453121A (en) | 2009-06-10 |
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Owner name: SHANGHAI MUNICIPAL ELECTRIC POWER COMPANY STATE EL Free format text: FORMER OWNER: TSINGHUA UNIVERSITY Effective date: 20120924 Owner name: TSINGHUA UNIVERSITY Free format text: FORMER OWNER: SHANGHAI MUNICIPAL ELECTRIC POWER COMPANY Effective date: 20120924 |
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Free format text: CORRECT: ADDRESS; FROM: 200122 PUDONG NEW AREA, SHANGHAI TO: 100084 HAIDIAN, BEIJING |
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Effective date of registration: 20120924 Address after: 100084 Haidian District Tsinghua Yuan Beijing No. 1 Patentee after: Tsinghua University Patentee after: Shanghai Electric Power Corporation Patentee after: State Grid Corporation of China Address before: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Patentee before: Shanghai Electric Power Corporation Patentee before: Tsinghua University |
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Owner name: TSINGHUA UNIVERSITY STATE GRID CORPORATION OF CHIN Free format text: FORMER OWNER: TSINGHUA UNIVERSITY Effective date: 20121109 |
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Effective date of registration: 20121109 Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Patentee after: Shanghai Electric Power Corporation Patentee after: Tsinghua University Patentee after: State Grid Corporation of China Address before: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Patentee before: Shanghai Electric Power Corporation Patentee before: Tsinghua University |