CN211606190U - Gas and steam combined cycle unit with cross-configured power supplies for low-voltage plants - Google Patents
Gas and steam combined cycle unit with cross-configured power supplies for low-voltage plants Download PDFInfo
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- CN211606190U CN211606190U CN202020569972.3U CN202020569972U CN211606190U CN 211606190 U CN211606190 U CN 211606190U CN 202020569972 U CN202020569972 U CN 202020569972U CN 211606190 U CN211606190 U CN 211606190U
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Abstract
The specification discloses a gas and steam combined cycle unit with a crossed power supply for a low-voltage plant, which comprises a first gas turbine unit high-voltage plant transformer, a second gas turbine unit high-voltage plant transformer, a first gas turbine unit six-kilovolt bus, a second gas turbine unit six-kilovolt bus, a first low-voltage plant transformer of a first gas turbine unit, a second low-voltage plant transformer of a first gas turbine unit, a first low-voltage plant transformer of a second gas turbine unit, a second low-voltage plant transformer of a second gas turbine unit, a first low-voltage plant transformer of a steam turbine unit and a second low-voltage plant transformer of a steam turbine unit. The buses of the two low-voltage substations of each unit are respectively connected into different six kilovolt bus sections, a combined switch is arranged between the two groups of buses of the low-voltage substations, and the combined switch is automatically switched on when the high-voltage bus section of the unit breaks down, so that the low-voltage power system of the unit is connected into the high-voltage bus section of the other unit, the normal operation of the low-voltage power system of the unit is ensured, and the safety and the reliability of the unit are improved.
Description
Technical Field
The utility model relates to an electromechanical technical field particularly, relates to a gas steam combined cycle unit of low pressure factory power supply cross arrangement.
Background
At present, two gas turbines of a gas turbine power plant gas and steam combined cycle unit are supplied with power for a low-voltage station service system through a high-voltage bus section, and during the operation of the gas turbine unit, if one unit breaks down or loses power when a 6kV high-voltage station service bus of the unit breaks down, all the low-voltage station service power of the unit loses power, so that a power supply for ensuring the safe shutdown of the unit can only depend on a corresponding diesel generator and a storage battery as an accident power supply, and if abnormal conditions such as diesel generator faults, safety section bus faults and incapability of running of a direct-current oil pump exist, serious equipment damage accidents can be caused.
Therefore, it is an urgent problem to research a gas turbine unit to improve the safety of the unit itself.
SUMMERY OF THE UTILITY MODEL
The present specification provides a gas and steam combined cycle unit with cross configuration of power supplies for low-voltage plants to overcome at least one technical problem in the prior art.
According to an embodiment of the present disclosure, a gas and steam combined cycle unit with a crossed configuration of low-voltage plant power supplies is provided, including a first gas turbine unit high-voltage plant transformer, a second gas turbine unit high-voltage plant transformer, a first gas turbine unit six kilovolt bus, a second gas turbine unit six kilovolt bus, a first low-voltage plant transformer of a first gas turbine unit, a second low-voltage plant transformer of a first gas turbine unit, a first low-voltage plant transformer of a second gas turbine unit, a second low-voltage plant transformer of a second gas turbine unit, a first low-voltage plant transformer of a gas turbine unit, and a second low-voltage plant transformer of a gas turbine unit, wherein:
the first combustion engine unit high-voltage station transformer supplies power to the first combustion engine unit six-kilovolt bus, and the second combustion engine unit high-voltage station transformer supplies power to the second combustion engine unit six-kilovolt bus;
the first low-voltage station transformer of the first gas turbine set is powered by a six-kilovolt bus of the first gas turbine set, and the second low-voltage station transformer of the first gas turbine set is powered by a six-kilovolt bus of the second gas turbine set;
the first low-voltage station transformer of the second combustion engine unit is powered by a six-kilovolt bus of the second combustion engine unit, and the second low-voltage station transformer of the second combustion engine unit is powered by a six-kilovolt bus of the first combustion engine unit;
the first low-voltage station transformer of the steam turbine unit is powered by the six-kilovolt bus of the first gas turbine unit, and the second low-voltage station transformer of the steam turbine unit is powered by the six-kilovolt bus of the second gas turbine unit.
Optionally, a first interconnection switch is arranged between a bus of a first low-voltage station transformer of the first gas turbine unit and a bus of a second low-voltage station transformer of the first gas turbine unit, and the first interconnection switch is configured with DCS backup power automatic switching logic.
Optionally, a second contact switch is arranged between the bus of the first low-voltage station transformer of the second combustion unit and the bus of the second low-voltage station transformer of the second combustion unit, and the second contact switch is configured with DCS backup power automatic switching logic.
Optionally, a third network switch is arranged between a bus of the first low-voltage station transformer of the steam turbine unit and a bus of the second low-voltage station transformer of the steam turbine unit, and the third network switch is configured with DCS backup power automatic switching logic.
The beneficial effects of the embodiment of the specification are as follows:
the embodiment of the specification provides a gas and steam combined cycle unit with a crossed low-voltage station power supply, wherein a first low-voltage station transformer of a first gas turbine unit is powered by a six-kilovolt bus of the first gas turbine unit, and a second low-voltage station transformer of the first gas turbine unit is powered by a six-kilovolt bus of a second gas turbine unit; the first low-voltage station transformer of the second combustion engine unit is powered by a six-kilovolt bus of the second combustion engine unit, and the second low-voltage station transformer of the second combustion engine unit is powered by a six-kilovolt bus of the first combustion engine unit; the first low-voltage station transformer of the steam turbine unit is powered by the six-kilovolt bus of the first gas turbine unit, and the second low-voltage station transformer of the steam turbine unit is powered by the six-kilovolt bus of the second gas turbine unit. The low-voltage station transformer power supplies of the first gas turbine unit, the second gas turbine unit and the steam turbine unit of the combined cycle unit are in a cross configuration mode, and the low-voltage station transformer power supplies are taken from different units, so that the condition that station equipment is damaged due to the fact that all low-voltage station transformer power supplies of the local unit lose power when a high-voltage station bus of the local unit breaks down is avoided. In addition, a connection switch is arranged between two low-voltage station service power buses of each unit and is configured with DCS backup automatic switching logic, and when one low-voltage station service power converter of the unit loses power, the connection switch is automatically switched on to ensure that a low-voltage system power supply of the unit normally supplies power, so that the power utilization safety of station service equipment when the high-voltage station service power converter of the unit fails is ensured. Compared with the power supply configuration of the existing unit, the power supply configuration of the circulating unit provided by the embodiment enables a low-voltage station power system to have higher safety and reliability.
The innovation points of the embodiment of the specification comprise:
1. in this specification, a gas and steam combined cycle unit with cross configuration of low-voltage plant power supplies is provided, in which two low-voltage plant power supplies of each unit are in a cross configuration mode, are taken from 6kV high-voltage plant buses of different units, and a tie switch configured with DCS standby power automatic switching logic is arranged between the low-voltage plant buses of the same unit, so that when one unit high-voltage plant power transformer fails, the low-voltage plant power transformer of the unit can obtain power supply from another unit through the tie switch, thereby ensuring the safety of a power system of the low-voltage plant power transformer, and improving the reliability of unit operation.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic wiring diagram of a combined gas and steam cycle plant with a cross configuration of low-voltage plant power supplies according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present specification and the drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The embodiment of the specification discloses a gas and steam combined cycle unit with a crossed power supply for a low-voltage plant. The details will be described below.
Fig. 1 is a schematic wiring diagram of a combined gas and steam cycle plant with a cross configuration of low-voltage plant power supplies according to an embodiment of the present disclosure. As shown in fig. 1, a gas-steam combined cycle unit with a crossed configuration of low-voltage plant power supplies includes a first gas turbine unit high-voltage plant power converter 101, a second gas turbine unit high-voltage plant power converter 103, a first gas turbine unit six kilovolt bus 105, a second gas turbine unit six kilovolt bus 107, a first gas turbine unit first low-voltage plant power converter 109, a first gas turbine unit second low-voltage plant power converter 111, a second gas turbine unit first low-voltage plant power converter 113, a second gas turbine unit second low-voltage plant power converter 115, a gas turbine unit first low-voltage plant power converter 117, and a gas turbine unit second low-voltage plant power converter 119, wherein: the first combustion engine unit high-voltage station transformer 101 supplies power to the first combustion engine unit six-kilovolt bus 105, and the second combustion engine unit high-voltage station transformer 103 supplies power to the second combustion engine unit six-kilovolt bus 107; the first low-voltage station transformer 109 of the first gas turbine set is powered by the six-kilovolt bus 105 of the first gas turbine set, and the second low-voltage station transformer 111 of the first gas turbine set is powered by the six-kilovolt bus 107 of the second gas turbine set; the first low-voltage station transformer 113 of the second combustion engine set is powered by a six-kilovolt bus 107 of the second combustion engine set, and the second low-voltage station transformer 115 of the second combustion engine set is powered by a six-kilovolt bus 105 of the first combustion engine set; the first low-voltage station transformer 117 of the steam turbine unit is powered by the six kilovolt bus 105 of the first steam turbine unit, and the second low-voltage station transformer 119 of the steam turbine unit is powered by the six kilovolt bus 107 of the second steam turbine unit.
In a specific embodiment, a first interconnection switch 121 is arranged between a bus of the first low-voltage power station transformer 109 of the first gas turbine unit and a bus of the second low-voltage power station transformer 111 of the first gas turbine unit, and the first interconnection switch 121 is configured with DCS backup automatic switching logic. The first tie switch 121 configured with the DCS backup automatic switching logic enables the low-voltage service system of the first combustion engine to be powered from the second combustion engine unit six kv bus 107 when the first combustion engine unit six kv bus 105 fails, thereby avoiding damage caused by sudden power loss of service equipment.
In a specific embodiment, a second connection switch 123 is disposed between the bus of the first low-voltage plant power converter 113 of the second fuel unit and the bus of the second low-voltage plant power converter 115 of the second fuel unit, and the second connection switch 123 is configured with DCS backup auto-switching logic. The second contact switch 123 configured with the DCS backup automatic switching logic enables the low-voltage utility system of the second combustion engine to be powered from the first combustion engine unit six kv bus 105 when the second combustion engine unit six kv bus 107 fails, thereby avoiding damage caused by sudden loss of power to the utility equipment.
In a specific embodiment, a third connection switch 125 is disposed between the bus of the first low-voltage power converter 117 of the steam turbine set and the bus of the second low-voltage power converter 119 of the steam turbine set, and the third connection switch 125 is configured with DCS backup automatic switching logic. The third network switch 125 configured with the DCS backup power automatic switching logic enables the low-voltage power system of the steam turbine to be powered from the set high-voltage bus that has not failed when the first combustion engine set six kilovolt bus 105 or the second combustion engine set six kilovolt bus 107 fails, thereby avoiding damage caused by sudden power loss of the equipment.
In this embodiment, the buses of the two groups of low-voltage station transformer of the first gas turbine unit, the buses of the two groups of low-voltage station transformer of the second gas turbine unit and the buses of the two groups of low-voltage station transformer of the gas turbine unit are respectively connected with the six kilovolt buses 105 of the first gas turbine unit and the six kilovolt buses 107 of the second gas turbine unit, and a communication switch configured with DCS logic is arranged between the buses of the two groups of low-voltage station transformer of each gas turbine unit, so that when a high-voltage station transformer of one group of gas turbines trips or loses power, the communication switch is automatically switched on, the low-voltage station transformer power supply system of the gas turbine unit is protected to still be supplied with power, equipment damage possibly caused by power loss of the low-voltage station power supply system is avoided, and compared with the prior art, the safety is higher, and the stability of the.
To sum up, the embodiments of the present specification provide a gas and steam combined cycle unit with a low-voltage station power supply configured in a cross manner, the low-voltage station power supply of the combined cycle unit adopts a cross configuration manner, two sets of buses of a low-voltage station transformer of each unit are respectively connected to different high-voltage bus sections, and a combined switch is configured between the buses of the two sets of low-voltage station transformers, and is used for automatically switching on when a fault occurs, so as to be connected to a high-voltage bus section of another unit, thereby ensuring the normal operation of the low-voltage station power system of the unit, reducing the impact on the low-voltage power system of the unit when the high-voltage station transformer of the unit fails, and further improving the safety and reliability of the unit.
Those of ordinary skill in the art will understand that: the figures are schematic representations of one embodiment, and the blocks or processes in the figures are not necessarily required to practice the present invention.
Those of ordinary skill in the art will understand that: modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be located in one or more devices different from the embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (4)
1. The utility model provides a gas steam combined cycle unit of low pressure station service power supply crossing configuration which characterized in that, includes that first gas turbine unit high pressure station service power converter, second gas turbine unit high pressure station service power converter, six kilovolt buses of first gas turbine unit, six kilovolt buses of second gas turbine unit, first gas turbine unit first low pressure station service power converter, first gas turbine unit second low pressure station service power converter, second gas turbine unit first low pressure station service power converter, second gas turbine unit second low pressure station service power converter, steam turbine unit first low pressure station service power converter, steam turbine unit second low pressure station service power converter, wherein:
the first combustion engine unit high-voltage station transformer supplies power to the first combustion engine unit six-kilovolt bus, and the second combustion engine unit high-voltage station transformer supplies power to the second combustion engine unit six-kilovolt bus;
the first low-voltage station transformer of the first gas turbine set is powered by a six-kilovolt bus of the first gas turbine set, and the second low-voltage station transformer of the first gas turbine set is powered by a six-kilovolt bus of the second gas turbine set;
the first low-voltage station transformer of the second combustion engine unit is powered by a six-kilovolt bus of the second combustion engine unit, and the second low-voltage station transformer of the second combustion engine unit is powered by a six-kilovolt bus of the first combustion engine unit;
the first low-voltage station transformer of the steam turbine unit is powered by the six-kilovolt bus of the first gas turbine unit, and the second low-voltage station transformer of the steam turbine unit is powered by the six-kilovolt bus of the second gas turbine unit.
2. The assembly according to claim 1, comprising: a first interconnection switch is arranged between a bus of a first low-voltage station transformer of the first gas turbine unit and a bus of a second low-voltage station transformer of the first gas turbine unit, and the first interconnection switch is provided with DCS backup power automatic switching logic.
3. The assembly according to claim 1, comprising: and a second contact switch is arranged between the bus of the first low-voltage station transformer of the second combustion unit and the bus of the second low-voltage station transformer of the second combustion unit, and the second contact switch is configured with DCS backup power automatic switching logic.
4. The assembly according to claim 1, comprising: and a third network switch is arranged between the bus of the first low-voltage station transformer of the steam turbine unit and the bus of the second low-voltage station transformer of the steam turbine unit, and the third network switch is configured with DCS backup power automatic switching logic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020569972.3U CN211606190U (en) | 2020-04-16 | 2020-04-16 | Gas and steam combined cycle unit with cross-configured power supplies for low-voltage plants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020569972.3U CN211606190U (en) | 2020-04-16 | 2020-04-16 | Gas and steam combined cycle unit with cross-configured power supplies for low-voltage plants |
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| CN211606190U true CN211606190U (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020569972.3U Active CN211606190U (en) | 2020-04-16 | 2020-04-16 | Gas and steam combined cycle unit with cross-configured power supplies for low-voltage plants |
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| CN (1) | CN211606190U (en) |
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- 2020-04-16 CN CN202020569972.3U patent/CN211606190U/en active Active
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