CN216599008U

CN216599008U - Factory electrical system of gas turbine power plant

Info

Publication number: CN216599008U
Application number: CN202123126446.3U
Authority: CN
Inventors: 王春民; 李兴波
Original assignee: Guangzhou Development Nansha Power Co ltd
Current assignee: Guangzhou Development Nansha Power Co ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-05-24
Anticipated expiration: 2031-12-13

Abstract

The utility model relates to an auxiliary power system of a gas turbine power plant, which comprises a first power supply module, a second power supply module and a third power supply module, wherein the first power supply module is electrically connected with the second power supply module through the third power supply module; the third power supply module comprises a three-winding transformer, a third switching unit electrically connected with the three-winding transformer, and a third power supply unit, a fourth switching unit and a fifth switching unit electrically connected with the third switching unit; the fourth switch unit and the fifth switch unit are respectively electrically connected with the first power supply module and the second power supply module. The utility model can avoid the problem that the unit is influenced to be safely and reliably stopped when the diesel generator cannot be successfully started to cause serious equipment damage accidents when a 220kV line is tripped or a 220kV single-section bus differential works, and meets the actual application requirements.

Description

Factory electrical system of gas turbine power plant

Technical Field

The utility model relates to the technical field of electrical design, in particular to a factory electrical system of a gas turbine power plant.

Background

The existing gas and steam combined cycle unit does not have a plurality of public systems such as a coal conveying system and the like a coal machine, so that a 6kV public load section bus is not generally arranged, 1 starting standby transformer is arranged on 2 units of units, and the low-voltage side of the starting standby transformer is directly connected to the lower end of a 6kV factory standby section power supply of the 2 units of units through a fully-insulated pouring bus in a T mode.

However, currently, a 220kV line mainly adopts a 2X630mm2 steel-cored aluminum stranded wire overhead line, the transmission capacity is only about 650MW, and when the unit capacities of 2 units of some gas turbine power plants exceed 400MW and are only sent out through 2 return lines, the parallel operation of the 2 units does not satisfy the N-1 safety strategy of a sending-out line, 1 unit of 1 line splitting operation must be adopted, and simultaneously, 1 starting-standby transformer and 1 return line can only be hung on the same section of 220kV bus along with 1 unit of unit; and in addition, the other 1 return line can only be hung on another section of 220kV bus along with the other 1 unit. When a 220kV line trips or a 220kV single-section bus differential action is carried out, if the unit cannot successfully realize the FCB function and the auxiliary power supply is carried, at this time, the first standby power supply starting transformer does not work due to the voltage loss of the 220kV bus, and if the diesel generator cannot be started successfully, the unit is influenced to be safely and reliably stopped, and serious equipment damage accidents can be caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model aims to provide the power system for the gas turbine power plant factory, which can avoid serious equipment damage accidents caused by the fact that the safe and reliable shutdown of a unit is influenced when a diesel generator cannot be started successfully when a line is tripped or a single-section bus differential motion is carried out.

The factory power utilization system of the gas turbine power plant comprises a first power supply module, a second power supply module and a third power supply module, wherein the first power supply module is electrically connected with the second power supply module through the third power supply module; the third power supply module comprises a three-winding transformer, a third switching unit electrically connected with the three-winding transformer, and a third power supply unit, a fourth switching unit and a fifth switching unit which are electrically connected with the third switching unit through a standby 6kV bus; the fourth switch unit and the fifth switch unit are respectively electrically connected with the first power supply module and the second power supply module.

In addition, the combustion engine power plant station power utilization system provided by the utility model can also have the following additional technical characteristics:

further, the first power supply module includes a first double-winding transformer, a first switch unit electrically connected to the first double-winding transformer, and a first power supply unit electrically connected to the first switch unit.

Further, the first switch unit comprises a first switch electrically connected with the first 6kV bus and a second switch electrically connected with the second 6kV bus.

Further, the second power supply module includes a second double-winding transformer, a second switch unit electrically connected to the second double-winding transformer, and a second power supply unit electrically connected to the second switch unit.

Further, the second switch unit comprises a third switch electrically connected with a third 6kV bus and a fourth switch electrically connected with a fourth 6kV bus.

Further, the fourth switching unit includes a fifth switch, and a sixth switch and a seventh switch electrically connected to the fifth switch, respectively; the other end of the sixth switch is electrically connected with the first 6kV bus, and the other end of the seventh switch is electrically connected with the fourth 6kV bus.

Further, the fifth switching unit includes an eighth switch, and a ninth switch and a tenth switch electrically connected to the eighth switch, respectively; the other end of the ninth switch is electrically connected with the second 6kV bus, and the other end of the tenth switch is electrically connected with the third 6kV bus.

Further, the third switching unit is a low-voltage side disconnecting link of the third power supply module.

Further, the first power supply unit comprises a first power supply electrically connected with the first 6kV bus, and a second power supply electrically connected with the second 6kV bus.

Further, the second power supply unit comprises a third power supply electrically connected with the third 6kV bus and a fourth power supply electrically connected with the fourth 6kV bus.

The auxiliary power system of the gas turbine power plant comprises a first power supply module, a second power supply module and a third power supply module, wherein the first power supply module is electrically connected with the second power supply module through the third power supply module; the third power supply module comprises a three-winding transformer, a third switching unit electrically connected with the three-winding transformer, and a third power supply unit, a fourth switching unit and a fifth switching unit electrically connected with the third switching unit; the fourth switch unit and the fifth switch unit are respectively electrically connected with the first power supply module and the second power supply module. The utility model can avoid the problem of serious equipment damage accidents caused by the fact that the unit is influenced to be safely and reliably stopped when the diesel generator cannot be started successfully when a line is tripped or a single-section bus differential motion works, and meets the actual application requirements.

Drawings

FIG. 1 is a block diagram of a combustion engine power plant service power system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an electricity system for a gas turbine power plant in an embodiment of the present invention.

The following detailed description will further illustrate the utility model in conjunction with the above-described figures.

Detailed Description

In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the utility model are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must be in a particular orientation, constructed or operated in a particular manner, and is not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 2, an electrical system for a gas turbine power plant includes a first power supply module 10, a second power supply module 20, and a third power supply module 30. The first ends (input ends) of the first power supply module 10 and the third power supply module 30 are electrically connected with the output end (generator outlet voltage 22kV) of the power supply device; the first end (input end) of the second power supply module 20 is electrically connected with the output end (system voltage 220kV) of the power supply device, and the second ends (output ends) of the first power supply module 10, the second power supply module 20 and the third power supply module 30 are connected with the power consumption device (6kV) and are used for providing corresponding electric energy for the power consumption device. The first power supply module 10 is electrically connected to the second power supply module 20 through a third power supply module 30.

Further, the first power supply module 10 includes a first double-winding transformer 01T, a first switch unit electrically connected to the first double-winding transformer 01T, and a first power supply unit electrically connected to the first switch unit. Wherein the first double-winding transformer 01T is electrically connected to the first switching unit through a cable or a hard bus.

Specifically, the first switch unit includes a first switch 610a electrically connected to a first 6kV bus, and a second switch 610b electrically connected to a second 6kV bus. The first power supply unit comprises a first power supply electrically connected with the first 6kV bus 6kVIA section and a second power supply electrically connected with the second 6kV bus 6kVIB section. The first switch 610a section and the second switch 610b section are electrically connected with the first 6kV bus 6kVIA section and the second 6kV bus 6 kbib section through cables or hard buses, respectively.

Further, the second power supply module 20 includes a second double-winding transformer 02T, a second switching unit electrically connected to the second double-winding transformer 02T, and a second power supply unit electrically connected to the second switching unit. Wherein the second double-winding transformer 02T is electrically connected to the second switching unit through a cable or a hard bus.

Specifically, the second switch unit comprises a third switch 620b section electrically connected with a third 6kV bus 6kvia section, and a fourth switch 620a section electrically connected with a fourth 6kV bus 6kvib section. The second power supply unit comprises a third power supply electrically connected with the third 6kV bus 6kVIIA section and a fourth power supply electrically connected with the fourth 6kV bus 6kVIIB section. The third switch 620b section and the fourth switch 620b section are electrically connected with the third 6kV bus 6kVIIA section and the fourth 6kV bus 6kVIIB section through cables or hard buses respectively.

Further, the third power supply module 30 includes a three-winding transformer 03T, a third switching unit electrically connected to the three-winding transformer 03T, and a third power supply unit, a fourth switching unit, and a fifth switching unit electrically connected to the third switching unit through a standby 6kV bus 6 kVC. The fourth switch unit and the fifth switch unit are respectively electrically connected with the first power supply module and the second power supply module. The third switching unit is a low-voltage side switch 630 of the third power supply module. The third power supply unit comprises a fifth power supply electrically connected with the standby 6kV bus (6kV standby section).

Specifically, the fourth switching unit includes a fifth switch 640a, and a sixth switch 640b and a seventh switch 640c electrically connected to the fifth switch 640a, respectively. The other end of the sixth switch 640b is electrically connected to the first 6kV bus 6kVIA section, and the other end of the seventh switch 640c is electrically connected to the fourth 6kV bus 6kvib section. The sixth switch 640b and the seventh switch 640c are electrically connected to the first 6kV bus 6kVIA section and the fourth 6kV bus 6kvib section through cables or hard buses, respectively.

Specifically, the fifth switch unit includes an eighth switch 650a, and a ninth switch 650b and a tenth switch 650c electrically connected to the eighth switch 650a, respectively. The other end of the ninth switch 650b is electrically connected to the 6kVIB section of the second 6kV bus, and the other end of the tenth switch 650c is electrically connected to the 6kVIIA section of the third 6kV bus. The ninth switch 650b and the tenth switch 650c are electrically connected to the second 6kV bus bar 6 kbib section and the third 6kV bus bar 6kvia section through cables or hard buses, respectively.

During implementation, when a bus hung on a third power supply module (standby unit) performs differential motion or a line on the same bus trips, if the tripping unit cannot successfully realize the FCB function and the auxiliary power supply is carried out, and meanwhile, a diesel generator cannot be started automatically, all equipment of a 220kV system is scheduled in the period and operation is not allowed in a short time, an operator can disconnect the first power supply module and a low-voltage side switch of the second power supply module, and an eighth switch of a fifth switch, isolate and start a standby transformer, check that the 6kV auxiliary bus of the tripping unit has no fault, and ensure safe and reliable shutdown by operating the auxiliary power supply of the unit with a high-voltage transformer (confirming that a working power supply switch of the auxiliary bus of the shutdown unit is disconnected).

Further, 1 arbitrary unit standby in first power module (start-up change) and the second power module (start-up change) is overhauld at the opportunity, and at this moment the 220kV system adopts "1 machine 2 line to send out the operation mode, and third power module (standby unit) becomes the power supply station service power of supplying back through self owner, high factory, pulls open the eighth switch of fifth switch this moment. The standby power switch of the 6kV station service section of the standby unit is charged and operated, and when the other 1 operating unit is in a high station transformer or main transformer fault, the 6kV station service section working power switch trips to interlock the standby power switch. The standby function of the standby unit serving as the power supply of the running unit is realized.

Further, when a single-section 6.3kV factory-used section bus standby power switch and a bus are overhauled, for example, when a 6.3kV working first 6kV section bus and a standby power switch are overhauled, only a corresponding feeder power switch above a 6kV standby section needs to be pulled open at the moment, a 6.3kV factory-used third 6kV section bus power supply loses standby, a 6.3kV working fourth 6kV section bus and a third 6kV section bus can still continuously depend on a standby transformer to realize interlocking standby, and the standby power switch for tripping, interlocking and closing of the working power switch is realized.

Furthermore, according to the unit on-line electricity price and the starting-standby power supply price (including main transformer power supply), the standby unit can be flexibly selected to stop or start to operate a load power supply before grid connection. When the on-line electricity price of the unit is high, the standby unit is powered down by a main transformer and a high plant to run; when a standby transformer (with a main transformer, the inverse power supply price is higher), the standby unit stops working load and a small amount of load is supplied with power through 1 other unit 6kV station service, the standby unit 6kV station service standby power switch is switched on, the working power supply is switched off, and the working power supply switch and the standby power supply switch of the operating unit 6kV station service are switched on. (monitoring the running unit to change the high-plant running into the non-overload running), and at the moment, the 6kV service section working power switch of the running unit is tripped, interlocked and switched on by the 6kV service section working power switch, and the 6kV standby section 2 feeder power switch is switched on.

The method has the advantages that through automatic system operation mode identification and pressure plate switching, the 6kV factory power supply system can be well suitable for various operation modes, the operation safety and reliability of the 6kV factory power system are improved, and the safe and reliable operation of a power plant is ensured. According to the adjustment of a field operation system mode, relevant power supply switching logic, protection setting and action sequence can meet the actual field requirements, and popularization suggestions are provided.

The utility model provides a gas turbine power plant station service power system which comprises a first power supply module, a second power supply module and a third power supply module, wherein the first power supply module is electrically connected with the second power supply module through the third power supply module; the third power supply module comprises a three-winding transformer, a third switching unit electrically connected with the three-winding transformer, and a third power supply unit, a fourth switching unit and a fifth switching unit electrically connected with the third switching unit; the fourth switch unit and the fifth switch unit are respectively electrically connected with the first power supply module and the second power supply module. The utility model can avoid the problem of serious equipment damage accidents caused by the fact that the unit is influenced to be safely and reliably stopped when the diesel generator cannot be started successfully when a line is tripped or a single-section bus differential motion works, and meets the actual application requirements.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The factory power utilization system of the gas turbine power plant is characterized by comprising a first power supply module, a second power supply module and a third power supply module, wherein the first power supply module is electrically connected with the second power supply module through the third power supply module; the third power supply module comprises a three-winding transformer, a third switching unit electrically connected with the three-winding transformer, and a third power supply unit, a fourth switching unit and a fifth switching unit which are electrically connected with the third switching unit through a standby 6kV bus; the fourth switch unit and the fifth switch unit are respectively electrically connected with the first power supply module and the second power supply module.

2. The gas turbine power plant service electrical system of claim 1, wherein the first power supply module comprises a first double-winding transformer, a first switching unit electrically connected to the first double-winding transformer, and a first power supply unit electrically connected to the first switching unit.

3. The gas turbine power plant service electrical system of claim 2, wherein the first switching unit comprises a first switch electrically connected to a first 6kV bus and a second switch electrically connected to a second 6kV bus.

4. The gas turbine power plant electrical service system of claim 3, wherein the second power supply module comprises a second dual-winding transformer, a second switching unit electrically connected to the second dual-winding transformer, and a second power supply unit electrically connected to the second switching unit.

5. The gas turbine power plant electrical service system of claim 4, wherein the second switch unit comprises a third switch electrically connected to a third 6kV bus and a fourth switch electrically connected to a fourth 6kV bus.

6. The gas turbine power plant service electrical system of claim 5, wherein the fourth switching unit comprises a fifth switch, and a sixth switch and a seventh switch electrically connected to the fifth switch, respectively; the other end of the sixth switch is electrically connected with the first 6kV bus, and the other end of the seventh switch is electrically connected with the fourth 6kV bus.

7. The gas turbine power plant service electrical system of claim 5, wherein the fifth switching unit comprises an eighth switch, and a ninth switch and a tenth switch electrically connected to the eighth switch, respectively; the other end of the ninth switch is electrically connected with the second 6kV bus, and the other end of the tenth switch is electrically connected with the third 6kV bus.

8. The gas turbine power plant service electrical system of claim 1, wherein the third switching unit is a low side disconnecting link of the third power supply module.

9. The gas turbine power plant service electrical system of claim 3, wherein the first power supply unit comprises a first power source electrically connected to the first 6kV bus and a second power source electrically connected to the second 6kV bus.

10. The gas turbine power plant service electrical system of claim 5, wherein the second power supply unit comprises a third power source electrically connected to the third 6kV bus and a fourth power source electrically connected to the fourth 6kV bus.