Main wiring structure of booster station split operation gas turbine

Abstract

The utility model discloses a main wiring structure of a booster station split operation gas turbine. The main wiring structure comprises a generator, a main transformer, a standby transformer, a sending-out circuit, a bus, a circuit breaker assembly and an isolation switch assembly. The generator is selectively connected to different buses through a main transformer, a first circuit breaker and a plurality of first isolating switches; the sending-out lines are selectively connected to different buses through a second circuit breaker and a plurality of second isolating switches, and are grouped with the generators in a one-to-one manner, and at least two groups of sending-out lines are provided; the number of the standby transformers is at least two, and each standby transformer is selectively connected to different buses through a third circuit breaker and a plurality of third isolation switches. Under the wiring mode, the possibility that the auxiliary power system of any unit loses the power supply is greatly reduced regardless of a single-circuit line fault, a single unit and a single main transformer fault or maintenance, and the operation reliability of the unit is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power transformation, in particular to a main connection structure of a booster station split-operation fuel engine. Background Art

[0002] For the gas turbine generator sets whose transmission lines are connected to the 220kV power grid, the conventional solution is to use double busbar connection as the main connection. Two sets of units in the booster substation (booster station) in the power plant share one emergency shutdown / standby transformer to provide shutdown power and standby power for the two sets of units. The high-voltage side of the emergency shutdown / standby transformer is connected to the booster station busbar.

[0003] When the access to the power grid requires two units to run in parallel, the bus tie breaker of the booster station can be opened for busbar operation. Each unit can be connected to the same busbar with any one outgoing line combination, so that two units can run in parallel. At this time, if a certain outgoing line fails, the corresponding unit needs to be shut down. If the backup transformer is also connected to the busbar corresponding to the faulty line, the unit that needs to be shut down will lose the 6kV shutdown power supply, and the other normally operating unit will lose the 6kV backup power supply. In this case, a series of switching operations are required in the booster station to switch the backup transformer to the normally operating busbar. Since the switching operation in the 220kV booster station requires the consent and operation instructions of the power grid dispatcher, the time to restore the backup transformer is unpredictable, which will cause the normally operating unit to lack the shutdown / backup unit for a long time, so the reliability of this wiring form is insufficient. Utility Model Content

[0004] In order to solve the problem in the traditional solution that the emergency shutdown / backup transformer shared by the whole power plant can only be fixedly connected to a bus in the power plant booster station during operation and the bus cannot be switched under power, resulting in the whole plant losing backup power due to a failure of the same bus transmission line, the utility model proposes a booster station split-operation gas turbine main connection structure, which is used for gas turbine generator set projects in which different generator sets and different transmission lines adopt split operation mode in the booster station. Regardless of a single-circuit line failure, or a single unit or a single main transformer failure or maintenance, the possibility of any unit's plant power system losing power is greatly reduced, and the unit operation reliability is greatly improved.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A booster station split-operation fuel turbine main connection structure comprises a generator, a main transformer, a standby transformer, a transmission line, a busbar, a circuit breaker assembly and an isolating switch assembly, wherein the circuit breaker assembly comprises a first circuit breaker, a second circuit breaker and a third circuit breaker, and the isolating switch assembly comprises a first isolating switch, a second isolating switch and a third isolating switch; the generator is selectively connected to different busbars through the main transformer, the first circuit breaker and a plurality of first isolating switches; the transmission line is selectively connected to different busbars through the second circuit breaker and a plurality of second isolating switches, and is grouped one-to-one with the generator, and there are at least two groups; there are at least two standby transformers, and each standby transformer is selectively connected to different busbars through a third circuit breaker and a plurality of third isolating switches.

[0007] Furthermore, two or more transmission lines are connected to different substations.

[0008] Furthermore, two or more main transformers are connected to different busbars and outgoing lines of the booster station.

[0009] Furthermore, the transmission line and the main transformer are connected to different busbars in a group.

[0010] Furthermore, the busbars of the booster station are connected via a bus tie circuit breaker.

[0011] Furthermore, the bus tie circuit breaker is in an open state when the booster station operates normally, and the busbars of the booster station operate in separate columns.

[0012] Furthermore, two standby transformers are respectively connected to the busbars in separate operation.

[0013] The beneficial effects of the utility model are:

[0014] The utility model sets multiple emergency shutdown / standby transformers as shutdown / standby power supplies for multiple units. When the power plant is operated in separate columns, multiple standby transformers are connected to multiple bus sections, and each unit has a corresponding standby transformer to obtain reliable shutdown / standby power from another bus section. Under this wiring method, no matter a single-circuit line failure occurs, or a single unit or a single main transformer fails or is repaired, the possibility of any unit's power system losing power is greatly reduced, and the unit's operating reliability is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main wiring structure of the booster station split-operation gas turbine in an embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model, that is, the embodiments described are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the utility model.

[0017] For gas turbine generator sets whose transmission lines are connected to the 220kV power grid, the conventional solution is to use double busbar connection as the main connection. Two sets of units in the plant share one emergency shutdown / standby transformer to provide shutdown power and standby power for the two sets of units. The high-voltage side of the emergency shutdown / standby transformer is connected to the busbar of the booster station in the plant.

[0018] When the access to the power grid requires two units to run in parallel, the bus tie breaker of the booster station can be opened for busbar operation. Each unit can be connected to the same busbar with any one outgoing line combination, so that two units can run in parallel. At this time, if a certain outgoing line fails, the corresponding unit needs to be shut down. If the standby transformer is also connected to the busbar corresponding to the faulty line, the unit that needs to be shut down will lose the 6kV shutdown power supply, and the other normally operating unit will lose the 6kV backup power supply. In this case, a series of switching operations are required in the booster station to switch the standby transformer to the normally operating busbar. Since the switching operation in the 220kV booster station requires the consent and operation instructions of the power grid dispatcher, the time to restore the standby transformer is unpredictable, which will cause the normally operating unit to lack the shutdown / standby unit for a long time, so the reliability of this wiring form is insufficient.

[0019] Based on this, this embodiment provides a main connection structure of a booster station for a fuel engine in separate operation, including a generator, a main transformer, a standby transformer, a transmission line, a busbar, a circuit breaker assembly, and an isolating switch assembly. Among them, the circuit breaker assembly includes a first circuit breaker, a second circuit breaker, and a third circuit breaker, and the isolating switch assembly includes a first isolating switch, a second isolating switch, and a third isolating switch; the generator is selectively connected to different busbars through the main transformer, the first circuit breaker, and a number of first isolating switches; the transmission line is selectively connected to different busbars through the second circuit breaker and a number of second isolating switches, and is grouped one-to-one with the generator, and there are at least two groups; there are at least two standby transformers, and each standby transformer is selectively connected to different busbars through the third circuit breaker and a number of third isolating switches.

[0020] Preferably, if Figure 1As shown, this embodiment provides another main connection structure of the substation split-operation gas turbine, including an emergency shutdown / standby transformer (referred to as standby transformer), a generator, a main transformer, a transmission line (referred to as line), a bus, a circuit breaker, and a knife separator. A standby transformer can be selectively connected to different buses of the substation through a circuit breaker and two knife separators; the generator and the line are connected to different buses of the substation in groups of one to one through the circuit breaker and the knife separator.

[0021] In this scheme, two emergency shutdown / standby transformers are set up in the whole plant, which serve as shutdown / standby power supplies for two units respectively. When the power plant is operated in separate columns, the two standby transformers are connected to two bus sections respectively, and each unit has a corresponding standby transformer to obtain reliable shutdown / standby power from the other bus section. Under this wiring method, whether a single-circuit line failure occurs, or a single unit or a single main transformer fails or is repaired, the possibility of any unit's power system losing power is greatly reduced, and the unit's operating reliability is greatly improved.

[0022] Preferably, two or more transmission lines are connected to different substations.

[0023] Preferably, two or more main transformers are connected to different busbars and outgoing lines of the booster station.

[0024] Preferably, the transmission line and the main transformer are connected to different busbars in a group.

[0025] Preferably, the busbars of the booster station are connected via a bus tie circuit breaker.

[0026] Preferably, the bus tie breaker is in an open state when the booster station operates normally, and the busbars of the booster station operate in separate columns.

[0027] Preferably, the two standby transformers are respectively connected to the busbars in separate operation.

[0028] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A main connection structure of a booster station split-operation gas turbine, characterized in that: The invention comprises a generator, a main transformer, a standby transformer, a transmission line, a busbar, a circuit breaker assembly and an isolating switch assembly, wherein the circuit breaker assembly comprises a first circuit breaker, a second circuit breaker and a third circuit breaker, and the isolating switch assembly comprises a first isolating switch, a second isolating switch and a third isolating switch; the generator is selectively connected to different busbars through the main transformer, the first circuit breaker and a plurality of first isolating switches; the transmission line is selectively connected to different busbars through the second circuit breaker and a plurality of second isolating switches, and is grouped one-to-one with the generator, and there are at least two groups; there are at least two standby transformers, and each standby transformer is selectively connected to different busbars through a third circuit breaker and a plurality of third isolating switches.

2. A booster station split operation gas turbine main connection structure according to claim 1, characterized in that: Two or more outgoing transmission lines are connected to different substations.

3. The main connection structure of the booster station split operation gas turbine according to claim 1 is characterized in that: Two or more main transformers are connected to different busbars and outgoing lines of the booster station.

4. A booster station split operation gas turbine main connection structure according to any one of claims 2 or 3, characterized in that: The transmission line and the main transformer are connected to different busbars in groups.

5. The main connection structure of the booster station split operation gas turbine according to claim 1 is characterized in that: The busbars of the booster station are connected through bus tie circuit breakers.

6. A booster station split operation gas turbine main connection structure according to claim 5, characterized in that: The bus tie circuit breaker is in an open state when the booster station operates normally, and the busbars of the booster station operate in separate columns.

7. A booster station split-operation gas turbine main connection structure according to any one of claims 1 or 5, characterized in that: The two standby transformers are connected to the busbars in separate operation.

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