CN112271728A - Method for improving flexibility of thermal generator set switching station and operation method thereof - Google Patents
Method for improving flexibility of thermal generator set switching station and operation method thereof Download PDFInfo
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- CN112271728A CN112271728A CN202011102808.2A CN202011102808A CN112271728A CN 112271728 A CN112271728 A CN 112271728A CN 202011102808 A CN202011102808 A CN 202011102808A CN 112271728 A CN112271728 A CN 112271728A
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
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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
- H02J3/381—Dispersed generators
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention discloses a method for improving flexibility of a switching station of a thermal generator set and an operation method thereof, which improve the flexibility of the switching station by adding a spare interval at a first-stage booster station, adding a lead-out cable to the spare interval at a No. 3 unit of a second-stage system and adding two isolating switches of 3G and 4G at the spare interval, wherein the operation method of the switching station after the transformation mainly comprises the steps of connecting the No. 3 unit to the second-stage booster station or the first-stage booster station for power supply, connecting the No. 3 unit to the first-stage booster station for power supply through second-stage electrified switching operation, and connecting the No. 3 unit to the second-stage booster station for power supply through first-stage booster station electrified switching operation, so that the flexibility of the No. 3 unit is improved, the unit can be connected to 220KV I and II buses of the first-stage booster station and can also be connected to 220KV III and IV buses of the second-stage booster station, thereby perfecting the structure of a power grid, and the safety of the power grid is not influenced.
Description
Technical Field
The invention relates to the technical field of thermal generator set switching stations, in particular to a method for improving flexibility of a thermal generator set switching station and an operation method thereof.
Background
A first-stage booster station and a second-stage booster station of the existing power plant are used for interconnecting I and III buses through 213 section switches and interconnecting II and IV buses through 224 section switches. Under the normal operation mode, the 213 and 224 section switches are disconnected, the 212 and 234 bus coupler switches are switched on, the 220KV first-stage system is isolated from the 220KV second-stage system, and the 220KV first-stage system and the 220KV second-stage system are respectively connected to the west power grid and the east power grid.
In a peak power utilization period or a special operation mode, when power is supplied to the second phase in a first phase or the first phase in a second phase, the scheduling can lower the scheduling to switch on the 213 or 224 section switch, at the moment, the bus tie switch at the power supply side needs to be disconnected to ensure that the tide flows to the right side, and all outgoing lines (or 1 unit) of the bus tie switch at the disconnected side can be switched to one bus, which is called a single-bus operation mode. The operation mode is a non-standard operation mode, once a bus fails, all intervals on the bus are tripped, large-scale power failure is caused, the operation risk of a power grid is high, therefore, the 213 or 224 section switch is not normally switched on under the condition of no down-regulation, and even if the non-standard operation mode is adopted under special conditions, the operation mode cannot be operated for a long time.
At present, the unit operates for 28 years in the first period, the service life is close to 30 years, even if possible service life prolonging is considered, the period of continuous operation is limited, the current market situation heat supply demand is in a very long period, a large development space is provided, and if the heat supply can be continuously supplied, good contribution can be brought to the operation of a power plant. The first-stage unit is close to the service life, large-flow heat supply transformation is carried out, investment is large, the cost performance is low, and compared with the second-stage unit, the large-flow heat supply transformation is more practical. However, due to the fact that the capacity of a regional power grid is small, the peak-valley difference is large, a second-stage unit is often in a standby state under the condition that the system load is not high, even if large-flow heat supply transformation is implemented, the number of hours of unit utilization is low, and the heat supply transformation economy is poor.
Disclosure of Invention
In view of the above disadvantages, an object of the present invention is to provide a method for improving flexibility of a thermal power generating unit switching station and an operation method thereof, which allows a second-stage 3 unit to access both a second-stage system and a first-stage system, and does not affect safety of a power grid, and even in a minimum operation mode, can ensure that the second-stage 3 unit with better performance indexes can supply heat to the outside while generating power.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method for improving flexibility of a thermal generator set switching station is characterized in that a No. 1 unit and a No. 2 unit of a first-stage system and a No. 3 unit and a No. 4 unit of a second-stage system are connected with outdoor 220KV power distribution devices, the 220KV power distribution devices are connected through double buses, and the method comprises the following steps:
s1: adding a standby interval to the first-stage booster station;
s2: increasing the outgoing cable to a standby interval after the No. 3 unit 203 of the second-stage system is switched on and switched off;
s3: two 3G and 4G isolating switches are added at the first standby interval.
Preferably, the standby interval in step S1 is set at the first and second phase bustie switches 213, 224.
Preferably, the specific process of step S2 is as follows: and leading a group of overhead lines from the outgoing side of the switch 203 through the overhead lines, connecting the overhead lines into a cable terminal, and then connecting the overhead lines into a first-period standby interval through a cable trench or a bridge by adopting a 220KV crosslinked polyethylene cable.
Preferably, in step S3, after the cable from the second-phase No. 3 unit is connected to the overhead line through the cable terminal, the cable is connected to the first- phase 3G and 4G disconnectors, respectively, so as to connect to the first-phase bus.
An operation method for improving flexibility of a thermal generator set switching station comprises the following operation methods:
a. the No. 3 unit is connected to the grid to supply power to the second-stage booster station;
b. the No. 3 unit is connected to the grid to supply power to the first-stage booster station;
c. the No. 3 unit is powered by a first-stage booster station through a second-stage booster live switching operation;
d. no. 3 unit is by the first stage live switching operation that steps up to the second stage booster station power supply.
Preferably, the process of grid-connected power supply of the No. 3 unit to the second-phase booster station is as follows: a second-stage No. 3 machine set is connected to a second-stage 220KV III and IV bus in a grid-connected mode through 1G and 2G isolating switches, and at the moment, the interconnection switches 213 and 224 are disconnected.
Preferably, the process of grid-connection of the No. 3 unit to supply power to the first-stage booster station is as follows: a second-stage No. 3 machine set is connected to and connected to second-stage 220KV I and II buses through 3G and 4G isolating switches, and at the moment, the interconnection switches 213 and 224 are disconnected.
Preferably, the process from the second-stage boosting live-line switching operation to the first-stage booster station power supply of the No. 3 unit is as follows:
s1: the second-stage 3 machine set is accessed to the III bus through 1G, and the 4 machine set is accessed to the III bus through 204;
s2: a second-stage 234 bus coupler switch is turned on, a 4 # unit operation isolating switch is connected to an IV bus, and a 3 # unit is connected to a III bus;
s3: by simultaneously closing 213 the switch, opening 234 the switch;
s4: the No. 3 unit operation isolating switch is connected with the third generation (3G), and then the third generation (1G) is disconnected;
s5: after the 213 switch is switched off, the power supply of the No. 3 unit is changed from the power supply of the second-stage booster station to the power supply of the first-stage booster station;
s6: after the 212 switch is turned on, the 3G and 4G can be switched, and the I bus power supply is changed into the II bus power supply.
Preferably, the process from the first-stage boost live-line switching operation to the second-stage boost station power supply of the No. 3 unit is as follows:
s1: the second-stage No. 3 unit is accessed to the I bus through 3G;
s2: the second-stage bus-coupled switch 234 is closed, and the No. 4 unit operation isolating switch is connected with the IV bus;
s3: by simultaneously closing 213 the switch, opening 234 the switch;
s4: the No. 3 unit operation isolating switch is connected with the 1G, and then the 3G is disconnected;
s5: after the 213 switch is switched off, the power supply of the No. 3 unit is changed from the first-stage booster station to the second-stage booster station;
s6: after the switch 234 is turned on, 1G and 2G can be switched, and the power supply of the III bus is changed into the power supply of the IV bus.
The invention has the beneficial effects that: according to the invention, a standby interval is arranged in the first-stage booster station, two isolating switches 3G and 4G are added at the standby interval, and then the second-stage 3 machine set is connected, so that the flexibility of the 3 machine set is increased, the 3 machine set can be connected to 220KV I and II buses (western power grid) of the first-stage booster station and can also be connected to 220KV III and IV buses (east power grid) of the second-stage booster station, the structure of the power grid is perfected, the flexibility of the whole power grid and the utilization time of the machine set are improved, and the safety of the power grid is not influenced.
The invention is further described with reference to the following figures and examples.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is an electrical main wiring diagram of the present invention;
FIG. 2 is a layout diagram of the present invention;
FIG. 3 is a system parameter diagram of the present invention;
FIG. 4 is a positive sequence impedance plot of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Example 1:
referring to fig. 1 and 2, a method for improving flexibility of a thermal generator set switching station is that a unit 1 and a unit 2 of a first-stage system and a unit 3 and a unit 4 of a second-stage system are both connected to an outdoor 220KV power distribution device, and the 220KV power distribution device adopts double-bus connection, and is characterized by comprising the following steps:
s1: adding a standby interval to the first-stage booster station;
s2: increasing the outgoing cable to a standby interval after the No. 3 unit 203 of the second-stage system is switched on and switched off;
s3: two 3G and 4G isolating switches are added at the first standby interval.
Further, the spare interval in step S1 is set at the primary and secondary bus bar tie switches 213, 224.
Further, the specific process of step S2 is as follows: and leading a group of overhead lines from the outgoing side of the switch 203 through the overhead lines, connecting the overhead lines into a cable terminal, and then connecting the overhead lines into a first-period standby interval through a cable trench or a bridge by adopting a 220KV crosslinked polyethylene cable.
Further, in step S3, after the cable led from the second-phase No. 3 unit is connected to the overhead line through the cable terminal, the cable is connected to the first- phase 3G and 4G disconnectors, respectively, so as to connect to the first-phase bus.
A standby interval is added in a first-stage booster station, 2 high-voltage isolating switches are connected into a second-stage 3 machine set, the flexibility of the 3 machine set is improved, the 3 machine set can be connected to 220 KvI and II buses (western power grids) of the first-stage booster station and can also be connected to 220KV III and IV buses (east power grids) of the second-stage booster station, the power grid structure is improved, the flexibility is improved, and the utilization time of the machine set is prolonged.
The short-circuit current of the invention is provided by a system, and a large-square short-circuit impedance standard value (positive sequence 0.01023) is calculated, as shown in table 1:
TABLE 1 System parameters
According to the system parameters and the equipment parameters, a system diagram of the No. 3 unit which is transformed and is connected with the first-stage booster station is shown in FIG. 3, and a positive sequence impedance diagram is shown in FIG. 4.
The results of the bus short-circuit current of the 220KV system of the invention are shown in Table 2:
TABLE 2 short-circuit current checking results
The calculation result shows that the calculated value of the short-circuit current of each voltage grade does not exceed the parameter value of the existing equipment, and the requirement is met.
Example 2:
referring to fig. 1 and 2, an operation method for improving flexibility of a thermal generator set switch station comprises the following operation methods:
a. the No. 3 unit is connected to the grid and supplies power to a second-phase booster station:
connecting a second-stage No. 3 machine set into a second-stage 220KV III and IV bus through 1G and 2G isolating switches, and disconnecting the interconnection switches 213 and 224 at the moment;
b. the No. 3 unit is connected to the power supply of a first-stage booster station in a grid mode:
connecting a second-stage No. 3 machine set into a second-stage 220KV I bus and a second-stage 220KV II bus through 3G and 4G isolating switches, and disconnecting the interconnection switches 213 and 224 at the moment;
c. no. 3 unit is boosted electrified switching operation by the second phase and is supplied power to the first phase booster station:
s1: the second-stage 3 machine set is accessed to the III bus through 1G, and the 4 machine set is accessed to the III bus through 204;
s2: a second-stage 234 bus coupler switch is turned on, a 4 # unit operation isolating switch is connected to an IV bus, and a 3 # unit is connected to a III bus;
s3: by simultaneously closing 213 the switch, opening 234 the switch;
s4: the No. 3 unit operation isolating switch is connected with the third generation (3G), and then the third generation (1G) is disconnected;
s5: after the 213 switch is switched off, the power supply of the No. 3 unit is changed from the power supply of the second-stage booster station to the power supply of the first-stage booster station;
s6: after the 212 switch is switched on, the 3G and 4G can be switched, and the power supply of the I bus is changed into the power supply of the II bus;
d. no. 3 unit is boosted electrified switching operation by the first phase and is supplied power to the second phase booster station:
s1: the second-stage No. 3 unit is accessed to the I bus through 3G;
s2: the second-stage bus-coupled switch 234 is closed, and the No. 4 unit operation isolating switch is connected with the IV bus;
s3: by simultaneously closing 213 the switch, opening 234 the switch;
s4: the No. 3 unit operation isolating switch is connected with the 1G, and then the 3G is disconnected;
s5: after the 213 switch is switched off, the power supply of the No. 3 unit is changed from the first-stage booster station to the second-stage booster station;
s6: after the switch 234 is turned on, 1G and 2G can be switched, and the power supply of the III bus is changed into the power supply of the IV bus.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. In addition, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation, the use of the term being generic or similar to other means being encompassed by the invention.
Claims (9)
1. A method for improving flexibility of a thermal generator set switching station is characterized in that outdoor 220KV power distribution devices are connected to No. 1 and No. 2 units of a first-stage system and No. 3 and No. 4 units of a second-stage system, and the 220KV power distribution devices are connected through double buses, and the method comprises the following steps:
s1: adding a standby interval to the first-stage booster station;
s2: increasing the outgoing cable to a standby interval after the No. 3 unit 203 of the second-stage system is switched on and switched off;
s3: two 3G and 4G isolating switches are added at the first standby interval.
2. A method of improving thermal power generating unit switchyard flexibility as claimed in claim 1, wherein: the standby intervals in step S1 are set at the primary and secondary bus tie switches 213, 224.
3. A method of improving thermal power generating unit switchyard flexibility as claimed in claim 1, wherein: the specific process of step S2 is as follows: and leading a group of overhead lines from the outgoing side of the switch 203 through the overhead lines, connecting the overhead lines into a cable terminal, and then connecting the overhead lines into a first-period standby interval through a cable trench or a bridge by adopting a 220KV crosslinked polyethylene cable.
4. A method of improving thermal power generating unit switchyard flexibility as claimed in claim 1, wherein: in step S3, after the cable from the second-stage 3-number unit is connected to the overhead line through the cable terminal, the cable is connected to the first-stage 3G and 4G disconnectors, respectively, so as to connect to the first-stage bus.
5. An operating method for improving flexibility of a thermal power generating unit switching station according to any one of claims 1-4, characterized in that: the method comprises the following operation methods:
a. the No. 3 unit is connected to the grid to supply power to the second-stage booster station;
b. the No. 3 unit is connected to the grid to supply power to the first-stage booster station;
c. the No. 3 unit is powered by a first-stage booster station through a second-stage booster live switching operation;
d. no. 3 unit is by the first stage live switching operation that steps up to the second stage booster station power supply.
6. An operating method for improving flexibility of a thermal power generating unit switching station according to claim 5, wherein: the process that the No. 3 unit is connected to the grid to supply power to the second-phase booster station is as follows: a second-stage No. 3 machine set is connected to a second-stage 220KV III and IV bus in a grid-connected mode through 1G and 2G isolating switches, and at the moment, the interconnection switches 213 and 224 are disconnected.
7. An operating method for improving flexibility of a thermal power generating unit switching station according to claim 5, wherein: the process that the No. 3 engine set is connected to the grid to supply power to the first-stage booster station is as follows: a second-stage No. 3 machine set is connected to and connected to second-stage 220KV I and II buses through 3G and 4G isolating switches, and at the moment, the interconnection switches 213 and 224 are disconnected.
8. An operating method for improving flexibility of a thermal power generating unit switching station according to claim 5, wherein: the process that No. 3 unit boosts electrified switching operation to first phase booster station power supply by second phase does:
s1: the second-stage 3 machine set is accessed to the III bus through 1G, and the 4 machine set is accessed to the III bus through 204;
s2: a second-stage 234 bus coupler switch is turned on, a 4 # unit operation isolating switch is connected to an IV bus, and a 3 # unit is connected to a III bus;
s3: by simultaneously closing 213 the switch, opening 234 the switch;
s4: the No. 3 unit operation isolating switch is connected with the third generation (3G), and then the third generation (1G) is disconnected;
s5: after the 213 switch is switched off, the power supply of the No. 3 unit is changed from the power supply of the second-stage booster station to the power supply of the first-stage booster station;
s6: after the 212 switch is turned on, the 3G and 4G can be switched, and the I bus power supply is changed into the II bus power supply.
9. An operating method for improving flexibility of a thermal power generating unit switching station according to claim 5, wherein: the process from the first-stage boosting live-line switching operation to the second-stage boosting station power supply of the No. 3 unit is as follows:
s1: the second-stage No. 3 unit is accessed to the I bus through 3G;
s2: the second-stage bus-coupled switch 234 is closed, and the No. 4 unit operation isolating switch is connected with the IV bus;
s3: by simultaneously closing 213 the switch, opening 234 the switch;
s4: the No. 3 unit operation isolating switch is connected with the 1G, and then the 3G is disconnected;
s5: after the 213 switch is switched off, the power supply of the No. 3 unit is changed from the first-stage booster station to the second-stage booster station;
s6: after the switch 234 is turned on, 1G and 2G can be switched, and the power supply of the III bus is changed into the power supply of the IV bus.
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| CN202011102808.2A CN112271728A (en) | 2020-10-15 | 2020-10-15 | Method for improving flexibility of thermal generator set switching station and operation method thereof |
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| CN202011102808.2A CN112271728A (en) | 2020-10-15 | 2020-10-15 | Method for improving flexibility of thermal generator set switching station and operation method thereof |
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Application publication date: 20210126 |