CN110912145A - Load shedding device for isolated network operation of waste heat and gas generator set - Google Patents

Load shedding device for isolated network operation of waste heat and gas generator set Download PDF

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Publication number
CN110912145A
CN110912145A CN201911123054.6A CN201911123054A CN110912145A CN 110912145 A CN110912145 A CN 110912145A CN 201911123054 A CN201911123054 A CN 201911123054A CN 110912145 A CN110912145 A CN 110912145A
Authority
CN
China
Prior art keywords
waste heat
generator set
control branch
gas generator
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201911123054.6A
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Chinese (zh)
Inventor
汪光侠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Triumph Technology Engineering Co Ltd
Original Assignee
Shenzhen Triumph Technology Engineering Co Ltd
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Filing date
Publication date
Application filed by Shenzhen Triumph Technology Engineering Co Ltd filed Critical Shenzhen Triumph Technology Engineering Co Ltd
Priority to CN201911123054.6A priority Critical patent/CN110912145A/en
Publication of CN110912145A publication Critical patent/CN110912145A/en
Withdrawn legal-status Critical Current

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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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • 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

Abstract

The invention discloses a load shedding device for isolated network operation of a waste heat and gas generator set, wherein the waste heat generator set and the gas generator set distribute electric energy to main equipment and auxiliary equipment of a factory through a circuit breaker and a power distribution switch respectively; the load reduction device comprises a starting switch and a relay, wherein coils of the starting switch and the relay are connected with a tripping linkage normally open contact of the waste heat generator set circuit breaker in series to form a first control branch, and two ends of the first control branch are connected with a control power supply to form a loop; a normally open contact of the relay is connected with a shunt tripping coil of a distribution switch corresponding to the auxiliary equipment in series to form a second control branch, and the first control branch is connected with the second control branch in parallel; this deloading device can be when waste heat generating set breaks down, the auxiliary assembly in the isolated network of automatic cutout, and protection gas generating set does not transship, avoids the electric power interrupt of main load.

Description

Load shedding device for isolated network operation of waste heat and gas generator set
Technical Field
The invention relates to the technical field of waste heat and gas power generation, in particular to a load shedding device for isolated network operation of a waste heat and gas generator set.
Background
Isolated grid is a short for isolated grid, and generally refers to a small-capacity grid separated from a large grid. In a small power grid operated in isolation, usually only one or several generator sets are operated in parallel. For an isolated network system formed by parallel operation of a plurality of generator sets, the generated energy of a single generator is more than 8% of the total capacity according to the definition of the isolated network. China enters a large unit and large power grid era since the early 90 s, the single unit capacity in the large power grid is far less than 8% of the total capacity of the power grid, each unit generally has 10% -15% of overload allowance, if a unit speed regulation system in the power grid is normally put into use, once a certain unit breaks down and is disconnected, the power generation power lost by the power grid can be temporarily borne by the overload allowances of other units in the power grid, and the normal operation of the power grid is not influenced. Compared with an isolated network, the large power grid has the advantages of reliable power supply, stable frequency and stable voltage.
At present, the power grid of most of domestic areas is supplied by a large power grid. However, in remote areas or some underdeveloped countries, the power supply of the external network is unstable, and the requirements of partial enterprises on power supply cannot be met, the enterprises construct small gas power plants for supplying power to own factories through comparison of technical schemes and economic schemes, and for some enterprises capable of generating waste heat, in order to save energy, waste heat power generating sets are installed, and a power generating system of an isolated network is formed by a plurality of gas power generating sets and the waste heat power generating sets to supply power to power utilization equipment in the factories.
In order to safely and stably operate an isolated power grid system, when a power distribution system is designed, the power consumption of electric equipment is determined, grading power distribution is carried out according to the importance of power load, the generated energy of a waste heat generator set is determined according to waste heat parameters generated by a production line, and the number of the gas generator sets is determined according to the condition that the single-machine generated energy is about 70% of rated power so as to ensure that the total generated energy and the power consumption are basically balanced.
The generated energy of the waste heat generator set is greatly influenced by the process condition, and the auxiliary machine of the waste heat generator set is relatively complex, so that the waste heat generator set has poor stability and high failure rate compared with a gas generator set. When the waste heat generating set is shut down due to faults, if partial load is not immediately cut off, the gas generating set can be tripped and shut down due to overload, and therefore power failure of the whole plant is caused.
Disclosure of Invention
The invention aims to provide a load shedding device for isolated network operation of a waste heat and gas generator set, which can automatically cut off auxiliary equipment in an isolated network when the waste heat generator set breaks down, protect the gas generator set from overload and avoid power interruption of a main load.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a kind of waste heat and gas generating set isolated network operated load relieving device, waste heat generating set and gas generating set distribute the electric energy to main apparatus and auxiliary apparatus of the factory through circuit breaker and distribution switch separately; the load reduction device comprises a starting switch and a relay, coils of the starting switch and the relay are connected with a tripping linkage normally open contact of the waste heat generator set circuit breaker in series to form a first control branch, and two ends of the first control branch are connected with a control power supply to form a loop; the normally open contact of the relay is connected with the shunt opening tripping coil of the distribution switch corresponding to the auxiliary equipment in series to form a second control branch, and the first control branch is connected with the second control branch in parallel.
The invention has the advantages that when the waste heat generator set breaks down, the tripping linkage normally open contact of the breaker of the waste heat generator set is closed to electrify the relay, the normally open contact of the relay is closed, the shunt tripping coil of the auxiliary equipment corresponding to the power distribution switch is electrified, and the power distribution switch corresponding to the auxiliary equipment is disconnected, so that the auxiliary equipment is cut off from the isolated network, and at the moment, the gas generator set is only responsible for the power supply of the main load, thereby protecting the gas generator set from overload and avoiding the power interruption of the main load.
Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a schematic power distribution diagram of the present invention;
FIG. 2 is a schematic diagram of the control loop of the present invention.
Detailed Description
Referring to fig. 1 and 2, the present invention provides a load shedding device for isolated network operation of waste heat and gas generator sets, wherein a gas generator set 1 and a waste heat generator set 2 are respectively connected with a distribution bus through breakers Q11 and Q12, the distribution bus is connected with breakers QA21, QA22, QA23 and QA24, the outlet end of breaker QA21 is connected with distribution switches QA111, QA112, QA113, QA114 and QA115 in parallel, the outlet end of breaker QA22 is connected with distribution switches QA121, QA122, QA123, QA124 and QA125 in parallel, the outlet end of breaker QA23 is connected with distribution switches QA131, QA132, QA134 and QA135 in parallel, and the outlet end of breaker 24 is connected with distribution switches QA141, QA142, QA143, QA144 and QA145 in parallel.
The power distribution switches QA111 to QA114, QA121 to QA124, QA131 to QA134, and QA141 to QA144 are assigned to main devices of the plant, and the power distribution switches QA115, QA125, QA135, and QA145 are assigned to auxiliary devices of the plant.
The starting switch S1 and the coil of the relay K1 are connected with the tripping linkage normally open contact K2 of the waste heat generator set circuit breaker Q12 in series to form a first control branch, and two ends of the first control branch are connected with a 220V alternating current control power supply to form a loop; the normally open contact of the relay K1 is connected in series with the shunt tripping coil of the distribution switch corresponding to the auxiliary equipment, that is, the first normally open contact of the relay K1 is connected in series with the shunt tripping coil of the distribution switch QA115, the second normally open contact is connected in series with the shunt tripping coil of the distribution switch QA125, the third normally open contact is connected in series with the shunt tripping coil of the distribution switch QA135, the fourth normally open contact is connected in series with the shunt tripping coil of the distribution switch QA145 to form four branch circuits, and the four branch circuits are connected in parallel with the first control branch circuit to form a loop circuit.
If the load shedding device needs to be activated, the starting switch S1 is firstly closed, after the waste heat generator set 2 breaks down, the tripping linkage normally open contact K2 of the breaker of the waste heat generator set 2 is closed to enable the relay K1 to be electrified, the normally open contact of the relay K1 is closed, the shunt opening tripping coil of the distribution switch corresponding to the auxiliary equipment is electrified, the distribution switch corresponding to the auxiliary equipment is disconnected, namely the distribution switches QA115, QA125, QA135 and QA145 are disconnected, so that the auxiliary equipment is cut off from the isolated network, at the moment, the gas generator set is only responsible for power supply of the main load, the gas generator set is protected from overload, and power interruption of the main load is avoided. When the waste heat generator set is released from faults and restarted, the power distribution switches QA115, QA125, QA135 and QA145 are switched on respectively, and the auxiliary equipment on the lines is started to operate again. During the maintenance of the waste heat generator set, the other gas generator set can be restarted to supply power to the auxiliary equipment, and the normal operation of all the power loads of the whole plant is realized.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.

Claims (1)

1. A load reduction device for isolated network operation of a waste heat and gas generator set is characterized in that the waste heat generator set and the gas generator set distribute electric energy to main equipment and auxiliary equipment of a factory through a breaker and a distribution switch respectively; the normally open contact of the relay is connected with the shunt opening tripping coil of the distribution switch corresponding to the auxiliary equipment in series to form a second control branch, and the first control branch is connected with the second control branch in parallel.
CN201911123054.6A 2019-11-16 2019-11-16 Load shedding device for isolated network operation of waste heat and gas generator set Withdrawn CN110912145A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911123054.6A CN110912145A (en) 2019-11-16 2019-11-16 Load shedding device for isolated network operation of waste heat and gas generator set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911123054.6A CN110912145A (en) 2019-11-16 2019-11-16 Load shedding device for isolated network operation of waste heat and gas generator set

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202333805U (en) * 2011-12-14 2012-07-11 灵石县中煤九鑫焦化有限责任公司 Off-grid load-shedding device in case of power outage
US20120226386A1 (en) * 2009-09-07 2012-09-06 Abb Technology Ltd Method and system for power management
CN103166241A (en) * 2011-12-14 2013-06-19 深圳市康必达中创科技有限公司 Isolated power grid stability control system
CN103166228A (en) * 2011-12-14 2013-06-19 深圳市康必达中创科技有限公司 Load quick-cut control system
CN208461465U (en) * 2018-05-28 2019-02-01 泰豪科技股份有限公司 Two inlet wires one of one kind contact Power transfer system and power distribution equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120226386A1 (en) * 2009-09-07 2012-09-06 Abb Technology Ltd Method and system for power management
CN202333805U (en) * 2011-12-14 2012-07-11 灵石县中煤九鑫焦化有限责任公司 Off-grid load-shedding device in case of power outage
CN103166241A (en) * 2011-12-14 2013-06-19 深圳市康必达中创科技有限公司 Isolated power grid stability control system
CN103166228A (en) * 2011-12-14 2013-06-19 深圳市康必达中创科技有限公司 Load quick-cut control system
CN208461465U (en) * 2018-05-28 2019-02-01 泰豪科技股份有限公司 Two inlet wires one of one kind contact Power transfer system and power distribution equipment

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王国彬: "水泥余热电站机组孤网运行及其应用", 《水泥工程》 *

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Address after: 518054 5 / F, east block, beiyihai Plaza, Chuangye Road, Nanshan District, Shenzhen City, Guangdong Province

Applicant after: Shenzhen Kaisheng Technology Engineering Co.,Ltd.

Address before: 518054 5 / F, east block, beiyihai Plaza, Chuangye Road, Nanshan District, Shenzhen City, Guangdong Province

Applicant before: SHENZHEN TRIUMPH TECHNOLOGY ENGINEERING Co.,Ltd.

WW01 Invention patent application withdrawn after publication
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Application publication date: 20200324