CN115249982B - Power grid safety control system for load control of gas turbine generator set - Google Patents
Power grid safety control system for load control of gas turbine generator set Download PDFInfo
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- CN115249982B CN115249982B CN202110466796.XA CN202110466796A CN115249982B CN 115249982 B CN115249982 B CN 115249982B CN 202110466796 A CN202110466796 A CN 202110466796A CN 115249982 B CN115249982 B CN 115249982B
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- 238000001125 extrusion Methods 0.000 claims description 22
- 238000003825 pressing Methods 0.000 claims description 22
- 230000000087 stabilizing effect Effects 0.000 claims description 13
- 239000000446 fuel Substances 0.000 claims description 10
- 239000002689 soil Substances 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 60
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001932 seasonal effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- H02J3/38—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
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J3/144—Demand-response operation of the power transmission or distribution network
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
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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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
- H02J2310/58—The condition being electrical
- H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a power grid safety control system for controlling the load of a gas turbine generator set, which comprises the following steps: through the steps of equipment connection, ensuring the stable operation condition, system constitution, stable device outlet function realization and the like after the integral wiring, the power grid safety control system is constituted, thereby facilitating the integral operation. According to the power grid safety control system for controlling the load of the gas turbine generator set, not only can the occurrence of unplanned shutdown events of the relevant units of the power plant be reduced, but also the occurrence of large-area power failure of the power grid and load shedding accidents of the relevant units of the power plant caused by overload full-jump of double-circuit lines of the regional power grid can be avoided, in addition, the special wiring mode of the gas turbine generator set is utilized to ensure that the main unit and the high-power plant of the unit are not tripped after the corresponding gas turbine generator set is tripped, the operation mode of the power system of the unit group plant is unchanged, and the safety and reliability of other operation units are ensured.
Description
Technical Field
The invention relates to the technical field of gas turbine generator sets, in particular to a power grid safety control system for controlling the load of a gas turbine generator set.
Background
The gas generator set is a novel generator set which is developed to adapt to the world environment protection requirement and the new market environment, the natural gas generator set is mainly divided into two types, one type is a combined cycle gas turbine, the other type is a gas internal combustion engine, the power of the gas turbine is relatively high, the gas internal combustion engine is mainly used in large and medium power stations, the power of the gas internal combustion engine is relatively low, and the gas internal combustion engine is mainly used in small-sized distributed power stations. The novel environment-friendly power replacing fuel oil and coal-fired units is realized, various natural gas or harmful gas is fully utilized as fuel by the gas-fired generator, and the novel environment-friendly power replacing fuel oil and coal-fired units has the advantages of changing waste into valuables, being safe and convenient to operate, high in cost benefit, low in emission pollution, suitable for combined heat and power generation and the like, has very wide market prospect, is quite rich in natural gas resources in China, and has great potential for being greatly improved in the future compared with the abundant natural gas reserves in China, and the proportion of natural gas in primary energy consumption in China is too small.
At present, a part of newly built large-scale gas-steam combined cycle two-to-one machine group is used for temporarily unfinishing the related power distribution network formal outgoing line interval and the related supporting facility construction of the power grid in the initial stage of production, the standby interval of a 220kV system bus in a temporary access area is generally selected, and the condition that the rated power supply capacity of a machine set is not matched with the power grid outgoing line capacity possibly occurs.
Disclosure of Invention
The invention aims to provide a power grid safety control system for load control of a gas turbine generator set, which aims to solve the problems that in the background art, a large-scale gas-steam combined cycle two-to-one machine group is partially newly built at present, a temporary incomplete related power distribution network formal outgoing interval of a power grid in an initial period of production and the construction of related supporting facilities are generally selected, a standby interval of a 220kV system bus in a temporary access area is generally selected, and the condition that rated power supply capacity of the set is not matched with the capacity of a power grid outgoing line possibly occurs.
In order to achieve the above purpose, the present invention provides the following technical solutions: a power grid safety control system for controlling the load of a gas turbine generator set comprises the following steps:
Step one: and (3) equipment connection: (1) The newly built gas-steam combined cycle two-to-one unit group numbers are as follows: a #9 gas turbine unit, a #10 gas turbine unit and a #11 steam turbine unit; (2) 220kV double-bus-section bus bars are respectively: 4A, 4B, 5A, 5B. Wherein: the bus of the first section (4A and 5A tie switch 2245A switch) is in loop closing operation, and two outgoing lines of the 220kV first section bus are respectively a Huaying first line and a Huaying second line; the bus of the section B (4B and 5B tie switches 2245B are closed) runs in a loop, and two outgoing lines of the bus of the section B of 220kV are respectively a furrow slice line and a furrow slice line; (3) The communication line of the #9 gas turbine unit is connected to a 220kV 5B bus on the outlet interval of the stopped #3 unit through a switch; (4) #10 gas turbine generator system connecting lines are connected to 220kV 5A buses; (5) The #11 turbine unit connecting line is connected with a 220kV 4B bus with the wire outlet interval of the stopped #4 turbine unit through a switch; (6) the original standby #1 unit is connected with a 220kV 5A bus; (7) the original standby #2 unit is connected with a 220kV 4A bus;
Step two: the stable operation condition after the whole wiring is ensured, the condition of short circuit is prevented from occurring wholly, according to the rated power of the unit and the overload fixed value of the line, during the simultaneous operation of the newly built unit groups #9 and #11, the double-circuit line of the upturned water has N-1 accident, that is, the trip of one circuit line exists, the overload possibility exists on the other circuit line, the load control of the #9 gas turbine unit is required to prevent the overload trip of the line, the large-area power failure accident occurs in the regional power grid, because the original standby #1 and #2 units are used as the emergency heating unit of the present market, the simultaneous operation possibility of the #1 and #2 units exists in other season modes, and during the operation of the #1 and #2 units, the N-1 accident occurs on the double-circuit line of the upturned water, that the trip of the one circuit line exists, and the overload of the other circuit line does not exist. If #1 (or # 2) and #10 units are operated simultaneously or three units are operated simultaneously, the Huaying double-circuit line has N-1 accident, namely, one circuit line trips, the other circuit line is possibly overloaded, load control is needed to be carried out on the #10 gas turbine unit to prevent the overload trip of the circuit, so that a large-area power failure accident occurs in a regional power grid, two sets of stable control systems are respectively arranged on the newly-built unit side and the 220kV bus outgoing line side, the gas turbine units are controlled in load by using a control strategy under different season modes, and after N-1 faults occur in the circuit, the occurrence of large-area power failure accident of the regional power grid after all the double-circuit lines of the power supply center of the same regional power grid can be avoided, and the occurrence of unplanned shutdown event of the power plant caused by overload cutting of the circuit can be reduced. The safe and stable operation of the power grid is ensured, and abnormal conditions such as load shedding of a corresponding unit after the trip of a Huaying or a Huazhu double circuit line can be avoided;
Step three: the system is composed of two sets of stability control systems respectively named as a set A of stability control system on the side of a newly built engineering line and a set B of stability control system on the side of the newly built engineering line are arranged at a main station on the side of a 220kV bus outgoing line of the standby unit; the two sets of systems are respectively provided with a host and a slave, A, B are independently operated, two sets of stability control systems are arranged at a side substation of the newly-built unit, the two sets of systems are respectively named as a side stability control system A set of the newly-built engineering unit and a side stability control system B set of the newly-built engineering unit, the two sets of systems are respectively provided with the host and the slave, A, B are independently operated, a main station and a substation main machine are connected through a special optical fiber communication interface of the stability control system, and a line side main station and a side substation of the newly-built unit are respectively arranged according to the two sets of systems to form a safe control system A cabinet and a safe control system B cabinet. Each set of device consists of 1 host computer and 1 slave computer. A. B, the double systems run independently;
Step four: the outlet function of the stabilizing device is realized, and the machine set side stabilizing control system A, B receives machine cut-off commands of the #9 (or # 10) machine set, which are respectively connected to a #9 (or # 10) electric power protection A, B cabinet, and act on the complete stop of the #9 (or # 10) electric power protection, namely, cut off all power of the corresponding gas turbine set through a protective outlet loop of a jump generator outlet circuit breaker, a jump magnetic extinction switch, a jump gas turbine and the like, and send out. And the occurrence of abnormal conditions such as load shedding of a corresponding unit after the double-circuit line full-tripping of the same regional power grid and the occurrence of large-area power failure accidents of the regional power grid are avoided. In addition, the special wiring mode of the gas turbine generator set is utilized to ensure that the main transformer and the high-power plant of the corresponding gas turbine generator set are not tripped after the gas turbine generator set is tripped by the gas turbine, the operation mode of the power plant system of the group of the unit is unchanged, and the safety and reliability of other operation unit power plants of the group of the unit are ensured; the machine set side stability control system A, B receives a pressing force command, and is connected into a machine set group DCS control system through hard wiring, and the machine set group operation mode is judged through DCS logic: (1) If the DCS system judges that the current running mode is #9 to #11 running, when the set side stability control system A set of "pressing force" or B set of "pressing force" commands trigger, the DCS control system sends a #9 gas turbine "pressing force" command, the command is connected to a #9 gas turbine TCS control system, and the command acts on a #9 gas turbine medium-speed RB load-reducing functional module; (2) If the DCS system judges that the current running mode is #10 to #11 running, when the set side stabilization control system A sleeve pressing force or B sleeve pressing force command is triggered, the DCS control system triggers a #10 fuel engine pressing force command, the command is connected to a #10 fuel engine TCS control system, and the command acts on a #10 fuel engine medium-speed RB load-reducing functional module; (2) If the RB in the #9 (or # 10) unit acts, after the unit power or the current voltage is not reduced to a specified value in a specified time, the stabilizing control system master station sends a "cut-off command to the substation control system, and acts on the #9 (or # 10) gas turbine generator unit to trip, and the strategy reduces the load of the corresponding gas turbine unit to the specified value in the specified time through the stabilizing control system" extrusion force "function, so that the occurrence of unplanned shutdown abnormal conditions of the power plant is avoided as much as possible while the safe operation of the regional power grid is ensured.
Preferably, the rated power of the #9 and #10 gas turbine units is 380MW, and the maximum current of the corresponding 220kV interconnecting line is 1125A.
Preferably, when the rated power of the #11 turbine unit is 365MW, the maximum current of the corresponding 220kV connecting line is about 1080A.
Preferably, rated power of the #1 and #2 machine sets in the standby state is 167MW, and the maximum current of 220kV corresponding to the rated working condition of the machine sets is about 500A.
Preferably, the first line and the second line are characterized by overload current action values in summer: 1150A; other season overcurrent action values: 1420.
Preferably, the first line and the second line are overload power action values in summer: 372MW; other season overload power action values: 460MW.
Preferably, the second line of upturned soil is an overload current action value in summer: 1150A; other season overcurrent action values: 1420.
Preferably, the second line of upturned soil is overload power action value in summer: 372MW; other season overload power action values: 460MW.
Preferably, the rated power of the #9 and #10 gas turbine units is equal, and the specifications of the #9 and #10 gas turbine units are consistent.
Preferably, the rated power of the #1 and #2 units is equal, and the specifications of the #1 and #2 units are identical.
Compared with the prior art, the invention has the beneficial effects that: according to the power grid safety control system for controlling the load of the generator set of the gas turbine, the stability control system is used for controlling the output of the generator set by utilizing a non-control strategy under different seasonal modes, two sets of stability control systems are respectively arranged at the side of the newly-built generator set group and the side of the 220kV bus outgoing line, the two sets of systems operate independently, the non-control strategy is used for controlling the load of the generator set of the gas turbine under different seasonal modes, after N-1 faults occur on the corresponding lines, the function of 'extruding force' of the stability control system is realized by utilizing the medium-speed RB characteristic of the gas turbine, or the function of 'switching machine' of the stability control system is realized by being matched with the electric quantity protection outlet loop of the generator, the invention can not only reduce the occurrence of unplanned shutdown events of the generator set related to the power plant, but also can avoid the occurrence of large-area power loss and the load shedding of the generator set related to the power plant caused by full skip of the double-circuit line overload of the regional power grid, in addition, the special wiring mode of the generator set of the gas turbine is utilized for guaranteeing that the main transformer set and high-power plant transformer after the corresponding gas turbine generator set is tripped, the operation mode is not changed, and the power system operation mode is not changed, and other power plant safety is ensured.
Drawings
FIG. 1 is a logic diagram for judging the two-to-one operation mode of the unit;
FIG. 2 is a logic diagram for determining the operation mode of the unit in one-to-one mode;
FIG. 3 is a circuit overload logic diagram of the present invention;
FIG. 4 is a logic diagram of the press set output of the present invention;
FIG. 5 is a logic diagram of the stop/go decision logic of the present invention;
FIG. 6 is a circuit fault-free trip discrimination logic diagram of the present invention;
FIG. 7 is a flow chart showing the operation of the substation remote switch assembly according to the present invention;
FIG. 8 is a flow chart of the operation of the substation for receiving the pressing force of the remote press unit;
FIG. 9 is a diagram of the formula of FIG. 6 in accordance with the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-9, the present invention provides a technical solution: a power grid safety control system for controlling the load of a gas turbine generator set comprises the following steps:
Step one: and (3) equipment connection: (1) The newly built gas-steam combined cycle two-to-one unit group numbers are as follows: a #9 gas turbine unit, a #10 gas turbine unit and a #11 steam turbine unit; (2) 220kV double-bus-section bus bars are respectively: 4A, 4B, 5A, 5B. Wherein: the bus of the first section (4A and 5A tie switch 2245A switch) is in loop closing operation, and two outgoing lines of the 220kV first section bus are respectively a Huaying first line and a Huaying second line; the bus of the section B (4B and 5B tie switches 2245B are closed) runs in a loop, and two outgoing lines of the bus of the section B of 220kV are respectively a furrow slice line and a furrow slice line; (3) The communication line of the #9 gas turbine unit is connected to a 220kV 5B bus on the outlet interval of the stopped #3 unit through a switch; (4) #10 gas turbine generator system connecting lines are connected to 220kV 5A buses; (5) The #11 turbine unit connecting line is connected with a 220kV 4B bus with the wire outlet interval of the stopped #4 turbine unit through a switch; (6) the original standby #1 unit is connected with a 220kV 5A bus; (7) the original standby #2 unit is connected with a 220kV 4A bus;
Step two: the stable operation condition after the whole wiring is ensured, the condition of short circuit is prevented from occurring wholly, according to the rated power of the unit and the overload fixed value of the line, during the simultaneous operation of the newly built unit groups #9 and #11, the double-circuit line of the upturned water has N-1 accident, that is, the trip of one circuit line exists, the overload possibility exists on the other circuit line, the load control of the #9 gas turbine unit is required to prevent the overload trip of the line, the large-area power failure accident occurs in the regional power grid, because the original standby #1 and #2 units are used as the emergency heating unit of the present market, the simultaneous operation possibility of the #1 and #2 units exists in other season modes, and during the operation of the #1 and #2 units, the N-1 accident occurs on the double-circuit line of the upturned water, that the trip of the one circuit line exists, and the overload of the other circuit line does not exist. If #1 (or # 2) and #10 units are operated simultaneously or three units are operated simultaneously, the Huaying double-circuit line has N-1 accident, namely, one circuit line trips, the other circuit line is possibly overloaded, load control is needed to be carried out on the #10 gas turbine unit to prevent the overload trip of the circuit, so that a large-area power failure accident occurs in a regional power grid, two sets of stable control systems are respectively arranged on the newly-built unit side and the 220kV bus outgoing line side, the gas turbine units are controlled in load by using a control strategy under different season modes, and after N-1 faults occur in the circuit, the occurrence of large-area power failure accident of the regional power grid after all the double-circuit lines of the power supply center of the same regional power grid can be avoided, and the occurrence of unplanned shutdown event of the power plant caused by overload cutting of the circuit can be reduced. The safe and stable operation of the power grid is ensured, and abnormal conditions such as load shedding of a corresponding unit after the trip of a Huaying or a Huazhu double circuit line can be avoided;
Step three: the system is composed of two sets of stability control systems respectively named as a set A of stability control system on the side of a newly built engineering line and a set B of stability control system on the side of the newly built engineering line are arranged at a main station on the side of a 220kV bus outgoing line of the standby unit; the two sets of systems are respectively provided with a host and a slave, A, B are independently operated, two sets of stability control systems are arranged at a side substation of the newly-built unit, the two sets of systems are respectively named as a side stability control system A set of the newly-built engineering unit and a side stability control system B set of the newly-built engineering unit, the two sets of systems are respectively provided with the host and the slave, A, B are independently operated, a main station and a substation main machine are connected through a special optical fiber communication interface of the stability control system, and a line side main station and a side substation of the newly-built unit are respectively arranged according to the two sets of systems to form a safe control system A cabinet and a safe control system B cabinet. Each set of device consists of 1 host computer and 1 slave computer. A. B, the double systems run independently;
Step four: the outlet function of the stabilizing device is realized, and the machine set side stabilizing control system A, B receives machine cut-off commands of the #9 (or # 10) machine set, which are respectively connected to a #9 (or # 10) electric power protection A, B cabinet, and act on the complete stop of the #9 (or # 10) electric power protection, namely, cut off all power of the corresponding gas turbine set through a protective outlet loop of a jump generator outlet circuit breaker, a jump magnetic extinction switch, a jump gas turbine and the like, and send out. In addition, the special wiring mode of the gas turbine generator set is utilized to ensure that the main transformer and the high-power plant of the corresponding gas turbine generator set are not tripped after the corresponding gas turbine generator set is tripped by a cut-off machine, the running mode of a power system of a power plant group is not changed, and the safety and reliability of the power plant of other running units of the power plant group are ensured; the machine set side stability control system A, B receives a pressing force command, and is connected into a machine set group DCS control system through hard wiring, and the machine set group operation mode is judged through DCS logic: (1) If the DCS system judges that the current running mode is #9 to #11 running, when the set side stability control system A set of "pressing force" or B set of "pressing force" commands trigger, the DCS control system sends a #9 gas turbine "pressing force" command, the command is connected to a #9 gas turbine TCS control system, and the command acts on a #9 gas turbine medium-speed RB load-reducing functional module; (2) If the DCS system judges that the current running mode is #10 to #11 running, when the set side stabilization control system A sleeve pressing force or B sleeve pressing force command is triggered, the DCS control system triggers a #10 fuel engine pressing force command, the command is connected to a #10 fuel engine TCS control system, and the command acts on a #10 fuel engine medium-speed RB load-reducing functional module; (2) If the RB in the #9 (or # 10) unit acts, after the unit power or the current voltage is not reduced to a specified value in a specified time, the stabilizing control system master station sends a "cut-off command to the substation control system, and acts on the #9 (or # 10) gas turbine generator unit to trip, and the strategy reduces the load of the corresponding gas turbine unit to the specified value in the specified time through the stabilizing control system" extrusion force "function, so that the occurrence of unplanned shutdown abnormal conditions of the power plant is avoided as much as possible while the safe operation of the regional power grid is ensured.
Furthermore, when the rated power of the #9 and #10 gas turbine units is 380MW, the maximum current of the corresponding 220kV connecting line is 1125A, and the whole rated power is limited, so that the whole stable operation is ensured, and the conditions of short circuit and line burning are prevented.
Further, when the rated power of the #11 turbine unit runs at 365MW, the maximum current of the corresponding 220kV connecting line is about 1080A, the whole rated power is limited, and therefore the whole stable running is ensured, and the conditions of short circuit and line burning are prevented.
Furthermore, rated power of the #1 and #2 units in the standby state is 167MW, and the rated power of the units is limited to be about 500A corresponding to 220kV maximum current when the units are operated under the rated working condition, so that the integral stable operation is ensured, and the conditions of short circuit and line burning are prevented.
Further, the summer overload current action value of the Huaying first line and the Huaying second line: 1150A; other season overcurrent action values: 1420, the overall rated power is limited, so that the overall stable operation is ensured, and the conditions of short circuit and line burnout are prevented.
Further, the summer overload power action value of the Huaying first line and the Huaying second line: 372MW; other season overload power action values: 460MW limits the whole rated power, thereby ensuring the whole stable operation and preventing the whole from short circuit and line burning.
Further, the summer overload current action value of the first line of the upturned soil and the second line of the upturned soil: 1150A; other season overcurrent action values: 1420, the overall rated power is limited, so that the overall stable operation is ensured, and the conditions of short circuit and line burnout are prevented.
Further, the summer overload power action value of the first line of the upturned soil and the second line of the upturned soil: 372MW; other season overload power action values: 460MW limits the whole rated power, thereby ensuring the whole stable operation and preventing the whole from short circuit and line burning.
Furthermore, rated powers of the #9 and #10 gas turbine units are equal, and specifications of the #9 and #10 gas turbine units are identical.
Furthermore, the rated power of the #1 and #2 machine sets is equal, and the specifications of the #1 and #2 machine sets are identical.
Policy interpretation:
(1) Under the 'two-to-one' operation mode, the primary trip of the Huaying occurs, the other primary trip is overloaded, and the device acts to cut off the #10 unit;
(2) Under the 'two-to-one' operation mode, the first trip of the furrow slice occurs, the other trip is overloaded, and the device acts to cut off the #9 unit;
(3) In the operation mode of #9 and #11, the furrow slice is tripped once, and the other tripping is overloaded (the current and the active power are larger than the fixed value of the cutting machine), and the device acts to cut off the #9 unit;
(4) In the operation modes of #9 and #11, the furrow slice is tripped once, and the other tripping is overloaded (the current and the active power are larger than the extrusion force action fixed value and smaller than the cutting machine fixed value), and the device acts to press the #9 machine set to output;
(5) If the current and the active power of the circuit are smaller than the extrusion force target value in the time of waiting for delay of the extrusion force of the press unit, the extrusion force contact of the press unit returns immediately;
(6) If the current or active power of the line is larger than the extrusion force target value in the time of the extrusion force waiting time delay of the press unit, the extrusion force contact of the press unit is always kept, and after the extrusion force waiting time delay of the press unit is finished, the extrusion force contact of the press unit returns, and the device acts to cut off the #9 unit;
(7) In the operation modes of #9 and #11, the device does not act when the primary trip and the secondary overload occur;
(8) In the operation modes of #10 and #11, the device acts to cut off the #10 unit, wherein the primary trip of primary trip occurs, and the secondary overload (the current and the active power are larger than the fixed value of the cutting machine) occurs;
(9) In the operation modes of #10 and #11, primary trip and secondary trip occur, and the other secondary trip is overloaded (the current and the active power are larger than the extrusion force action fixed value and smaller than the cutting machine fixed value), so that the device action presses the extrusion force of the #10 machine set;
(10) If the current and the active power of the circuit are smaller than the extrusion force target value in the time of waiting for delay of the extrusion force of the press unit, the extrusion force contact of the press unit returns immediately;
(11) If the current or active power of the line is larger than the extrusion force target value in the time of the extrusion force waiting time delay of the press unit, the extrusion force contact of the press unit is always kept, and after the extrusion force waiting time delay of the press unit is finished, the extrusion force contact of the press unit returns, and the device acts to cut off the #10 unit;
(12) Under the operation modes of #10 and #11, the device does not act when the furrow is tripped once and overloaded once;
(13) Any loop current is larger than the overload current fixed value, and the device alarms;
(14) The primary circuit line of Huaying is overhauled, the other circuit line is overloaded, and the device has no strategy; the upturned soil-return line is overhauled,
(15) When the system frequency is 48Hz or 52 Hz; the device can act correctly according to the strategy;
(16) Oscillating the system; the device does not malfunction;
(17) During normal operation; the tide direction of the line is from the bus to the line; the device displays positive power and operates normally; the tide direction of the line is from the bus to the line; the device displays positive power, and the power reversal caused by CT polarity reversal and other reasons influences the strategy discrimination of the stability control device.
Master station policy constant value of stability control system
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Security control system substation policy fixed value
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Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A power grid safety control system for controlling load of a gas turbine generator set is characterized in that: the method comprises the following steps:
Step one: and (3) equipment connection: (1) The newly built gas-steam combined cycle two-to-one unit group numbers are as follows: a #9 gas turbine unit, a #10 gas turbine unit and a #11 steam turbine unit; (2) 220kV double-bus-section bus bars are respectively: 4 a, 4 b, 5a, 5 b, wherein: the bus of the first section (4A and 5A tie switch 2245A switch) is in loop closing operation, and two outgoing lines of the 220kV first section bus are respectively a Huaying first line and a Huaying second line; the bus of the section B (4B and 5B tie switches 2245B are closed) runs in a loop, and two outgoing lines of the bus of the section B of 220kV are respectively a furrow slice line and a furrow slice line; (3) The communication line of the #9 gas turbine unit is connected to a 220kV 5B bus on the outlet interval of the stopped #3 unit through a switch; (4) #10 gas turbine generator system connecting lines are connected to 220kV 5A buses; (5) The #11 turbine unit connecting line is connected with a 220kV 4B bus with the wire outlet interval of the stopped #4 turbine unit through a switch; (6) the original standby #1 unit is connected with a 220kV 5A bus; (7) the original standby #2 unit is connected with a 220kV 4A bus;
Step two: the stable operation condition after the whole wiring is ensured, the condition of short circuit is prevented from occurring wholly, according to the rated power of the unit and the overload fixed value of the line, during the simultaneous operation of the newly built unit groups #9 and #11, the double-circuit line is subjected to N-1 accident, namely, one circuit line trips, the other circuit line is possibly overloaded, the #9 gas turbine unit is required to be subjected to load control to prevent the overload trip of the line, so that the regional power grid is subjected to large-area power failure accident, the original standby #1 and #2 units are used as the emergency heating unit of the present market, the #1, the #2 and #10 units are possibly operated simultaneously in other seasons, the double-circuit line is subjected to N-1 accident during the operation period of the #1 and the #2 units, the double-circuit line is subjected to N-1 accident, the other circuit line is not overloaded, for example, the double-circuit line is subjected to N-1 accident, the double-circuit line is simultaneously operated, the double-circuit line is not tripped, the other circuit line is required to be subjected to load control to the overload trip of the line, the #10 gas turbine unit is required to be subjected to load control to prevent the overload trip of the line, the regional power failure accident is caused by the large-area, the regional power failure accident is caused by the fact that the large-area power grid is not to be subjected to the overload trip accident, the same as the power failure accident is caused by the power failure accident of the power failure of the power grid, the power failure of the power failure control system is not occurs in the same in the power grid, and the same power control system, and the power is not has the same type, and the same power is not has the same power to the same power safety control system, and the same power has the same power failure condition that is not is stably causes the same. The abnormal conditions such as load shedding of the corresponding units after the double circuit lines of the Huaying or the Huazhong are tripped can be avoided;
Step three: the system is composed of two sets of stability control systems respectively named as a set A of stability control system on the side of a newly built engineering line and a set B of stability control system on the side of the newly built engineering line are arranged at a main station on the side of a 220kV bus outgoing line of the standby unit; the two sets of systems are respectively provided with a host and a slave, A, B are independently operated, a side substation of the newly-built unit is provided with two sets of stability control systems, which are respectively named as a side stability control system A set of the newly-built engineering unit and a side stability control system B set of the newly-built engineering unit, the two sets of systems are respectively provided with the host and the slave, A, B are independently operated, the host and the slave are connected through a special optical fiber communication interface of the stability control system, a line side host and a side substation of the newly-built unit are respectively arranged according to the two sets of systems, a side cabinet and a side cabinet of the stability control system B are arranged, each set of device consists of 1 host and 1 slave, and A, B are mutually independently operated;
Step four: the outlet function of the stabilizing device is realized, a machine set side stabilizing control system A, B receives a machine set switching command of #9 (or # 10) and is respectively connected to a #9 (or # 10) generator electric quantity protection A, B cabinet, the machine set side stabilizing control system acts on the #9 (or # 10) generator electric quantity protection to stop completely, namely, all power of a corresponding gas turbine set is cut off through a protective outlet loop of a jump generator outlet breaker, a jump magnetic-eliminating switch, a jump combustion engine and the like, so that the occurrence of large-area power failure accidents of the regional power grid caused by the full jump of a double-loop circuit of the same regional power grid and the occurrence of abnormal conditions such as load shedding of the corresponding machine set after the full jump of the double-loop circuit are avoided, in addition, the special wiring mode of the gas turbine generator set is utilized to ensure that the main transformer and high-level plant of the corresponding gas turbine generator set are not tripped after the corresponding gas turbine generator set is tripped, the operation mode of a power system for the group plant is unchanged, and the power consumption safety and reliability of other operation machine sets of the group are ensured; the machine set side stability control system A, B receives a pressing force command, and is connected into a machine set group DCS control system through hard wiring, and the machine set group operation mode is judged through DCS logic: (1) If the DCS system judges that the current running mode is #9 to #11 running, when the set side stability control system A set of "pressing force" or B set of "pressing force" commands trigger, the DCS control system sends a #9 gas turbine "pressing force" command, the command is connected to a #9 gas turbine TCS control system, and the command acts on a #9 gas turbine medium-speed RB load-reducing functional module; (2) If the DCS system judges that the current running mode is #10 to #11 running, when the set side stabilization control system A sleeve pressing force or B sleeve pressing force command is triggered, the DCS control system triggers a #10 fuel engine pressing force command, the command is connected to a #10 fuel engine TCS control system, and the command acts on a #10 fuel engine medium-speed RB load-reducing functional module; (2) If the RB in the #9 (or # 10) unit acts, after the unit power or the current voltage is not reduced to a specified value in a specified time, the stabilizing control system master station sends a "cut-off command to the substation control system, and acts on the #9 (or # 10) gas turbine generator unit to trip, and the strategy reduces the load of the corresponding gas turbine unit to the specified value in the specified time through the stabilizing control system" extrusion force "function, so that the occurrence of unplanned shutdown abnormal conditions of the power plant is avoided as much as possible while the safe operation of the regional power grid is ensured.
2. The power grid safety control system for load control of a gas turbine generator set of claim 1, wherein: and when the rated power of the #9 and #10 gas turbine units is 380MW, the maximum current of the corresponding 220kV interconnecting line is 1125A.
3. The power grid safety control system for load control of a gas turbine generator set of claim 1, wherein: when the rated power of the #11 turbine unit is 365MW, the maximum current of the corresponding 220kV interconnecting line is about 1080A.
4. The power grid safety control system for load control of a gas turbine generator set of claim 1, wherein: rated power of the #1 and #2 units in the standby state is 167MW, and the maximum current of the units is about 500A corresponding to 220kV when the units are operated under the rated working condition.
5. The power grid safety control system for load control of a gas turbine generator set of claim 1, wherein: summer overload current action value of the Huaying first line and the Huaying second line: 1150A; other season overcurrent action values: 1420.
6. The power grid safety control system for load control of a gas turbine generator set of claim 1, wherein: the summer overload power action value of the Huaying first line and the Huaying second line is as follows: 372MW; other season overload power action values: 460MW.
7. The power grid safety control system for load control of a gas turbine generator set of claim 1, wherein: the summer overload current action value of the first line of the upturned soil and the second line of the upturned soil: 1150A; other season overcurrent action values: 1420.
8. The power grid safety control system for load control of a gas turbine generator set of claim 1, wherein: the summer overload power action value of the first line and the second line of the upturned soil: 372MW; other season overload power action values: 460MW.
9. The power grid safety control system for load control of a gas turbine generator set of claim 1, wherein: the rated power of the #9 and #10 gas turbine units is equal, and the specifications of the #9 and #10 gas turbine units are identical.
10. The power grid safety control system for load control of a gas turbine generator set of claim 1, wherein: and rated powers of the #1 and #2 units are equal, and specifications of the #1 and #2 units are identical.
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