An improved gas-steam combined cascade black start unit
By designing an improved gas-steam combined cascade black starter unit, the use of diesel generators and gas units to achieve cascade black starter is solved, and the problem of difficulty in achieving black starter under extreme meteorological conditions is reduced, and the power support capacity is improved.
Patent Information
- Application Number
- CN202421287617.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-06
AI Technical Summary
Under extreme meteorological conditions, the second phase of natural gas power generation expansion project needs to achieve black start without external power support, and it is difficult for the existing technology to effectively configure diesel engines or energy storage devices to have black start capabilities.
An improved gas-steam combined cascade black starter unit is designed, including diesel generators, first-phase gas engines and second-phase gas engines. The first-phase black starter power is provided through the diesel generator and connected to the first-phase gas engine, thereby realizing the cascade black start mode.
The unit stage black start mode is realized, which reduces the number of units and reduces the footprint. It has great advantages and can effectively provide power support under extreme meteorological conditions.
Smart Images
Figure CN222750144U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power generation, in particular to an improved gas-steam combined cascade black start unit. Background Art
[0002] Black start refers to the service of restoring power supply to the power system provided by generator sets with self-starting capability without external power support after a large-scale power outage in the power system. When a major accident occurs under extreme weather conditions (such as typhoon weather), the combined cycle can start up without relying on external power supply when equipped with backup power sources such as black start diesel generators, based on its fast start and stop operation characteristics, and can become a reliable supporting power source, which is of great significance for restoring power supply to the regional power grid.
[0003] At present, in the second phase of natural gas power generation expansion project, two sets of F-class improved gas and steam combined cycle pure condensing units need to be built. If the construction conditions are met, diesel engines or energy storage devices should be configured to have black start or strong isolated grid operation capabilities as disaster protection power sources to improve the disaster prevention, resistance and mitigation capabilities of the power system in the core area. Therefore, the second phase units should consider having black start capabilities. Therefore, an improved gas-steam combined cascade black start unit is provided to solve the above problems. Utility Model Content
[0004] In order to solve the problems in the above background technology, the technical solution adopted by the utility model to solve the technical problems is: an improved gas-steam combined cascade black start unit, which includes: a diesel generator, a first-phase gas turbine and a second-phase gas turbine unit, the diesel generator provides a first-phase black start power supply, the first-phase black start power supply is electrically connected to the first-phase gas turbine, the input end of the second-phase gas turbine unit is connected to the second-phase plant bus, and the second-phase gas turbine unit is connected to the first booster station and the second booster station through the second-phase plant bus.
[0005] As a preferred technical solution of the utility model, the first booster station includes a first switch, a high-voltage plant transformer, a main transformer, and a second-phase bus. The first switch is electrically connected to the high-voltage plant transformer, the high-voltage plant transformer is electrically connected to the main transformer, and the second-phase bus is electrically connected to the second-phase bus.
[0006] As a preferred technical solution of the utility model, the first switch is electrically connected to the second phase plant bus, the second phase bus is 220kv, and the second phase plant bus is 6kv.
[0007] As a preferred technical solution of the present utility model, the second booster station includes a third switch, a high-voltage standby transformer, a fourth switch, and a first-phase busbar, the third switch is electrically connected to the high-voltage standby transformer, the high-voltage standby transformer is electrically connected to the fourth switch, and the fourth switch is electrically connected to the first-phase busbar.
[0008] As a preferred technical solution of the utility model, the third switch is electrically connected to the second phase plant bus, and the first phase bus is 110kv.
[0009] As a preferred technical solution of the utility model, the first-phase gas turbine is electrically connected to a second booster station, the second booster station includes a fifth switch, a first-phase main transformer, and a sixth switch, the fifth switch is electrically connected to the first-phase main transformer and the first-phase gas turbine, respectively, the first-phase main transformer is electrically connected to the sixth switch, and the sixth switch is electrically connected to the first-phase bus.
[0010] The utility model has the following advantages: the second-phase black start power supply is connected to the first-phase gas turbine, thereby realizing the unit cascade black start mode. Compared with the traditional method, the number of units is reduced, the floor space is reduced, and it has great advantages. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a schematic diagram of the operating principle of a black start unit in a preferred embodiment of the utility model;
[0012] Figure 2 This is a schematic diagram of the black start principle of the preferred embodiment of the utility model;
[0013] Figure 3 This is a schematic diagram of the high-voltage standby transformer power supply connection circuit of the preferred embodiment of the utility model;
[0014] Figure 4 It is a schematic diagram of the high-voltage standby transformer circuit of the preferred embodiment of the utility model.
[0015] Explanation of the reference numerals: 1. diesel generator; 2. first phase black start power supply; 3. first phase gas turbine; 5. second phase gas turbine unit; 6. second phase plant bus; 7. first switch; 8. high voltage plant transformer; 9. main transformer; 10. second phase bus; 11. third switch; 12. high voltage standby transformer; 13. fourth switch; 14. first phase bus; 15. fifth switch; 16. first phase main transformer; 17. sixth switch. DETAILED DESCRIPTION
[0016] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0018] The utility model will be further described below in conjunction with the accompanying drawings.
[0019] Please refer to Figure 1-Figure 4 The utility model discloses an improved gas-steam combined cascade black start unit, comprising: a diesel generator 1, a first-phase gas turbine 3 and a second-phase gas turbine unit 5. The diesel generator provides a first-phase black start power supply 2, the first-phase black start power supply 2 is electrically connected to the first-phase gas turbine 3, the first-phase gas turbine 3 provides a second-phase black start power supply, the input end of the second-phase gas turbine unit 5 is connected to the second-phase plant bus 6, and the second-phase gas turbine unit 5 is connected to the first booster station and the second booster station through the second-phase plant bus 6.
[0020] Combination Figure 1 , Figure 2 As shown, the first booster station includes a first switch 7, a high-voltage plant transformer 8, a main transformer 9, and a second-phase bus 10. The first switch 7 is electrically connected to the high-voltage plant transformer 8, the high-voltage plant transformer 8 is electrically connected to the main transformer 9, the second-phase bus 10 is electrically connected to the second-phase bus 10, and the first switch 7 is electrically connected to the second-phase plant bus 6. The second-phase bus 10 is 220kv, and the second-phase plant bus 6 is 6kv.
[0021] Among them, the second booster station includes the third switch 11, the high-voltage standby transformer 12, the fourth switch 13, and the first-phase bus 14. The third switch 11 is electrically connected to the high-voltage standby transformer 12, the high-voltage standby transformer 12 is electrically connected to the fourth switch 13, the fourth switch 13 is electrically connected to the first-phase bus 14, the third switch 11 is electrically connected to the second-phase plant bus 6, the first-phase bus 14 is 110kv, and the first-phase gas turbine 3 is electrically connected to the second booster station. The second booster station includes the fifth switch 15, the first-phase main transformer 16, and the sixth switch 17. The fifth switch 15 is electrically connected to the first-phase main transformer 16 and the first-phase gas turbine 3, respectively, the first-phase main transformer 16 is electrically connected to the sixth switch 17, and the sixth switch 17 is electrically connected to the first-phase bus 14. And the second phase uses the Siemens SGT5-4000F single-shaft combined cycle unit and is equipped with an SSS clutch.
[0022] Among them, the black start reference load list of Siemens SGT5-4000F single-shaft combined cycle unit is shown in Table 1
[0023] Table 1
[0024]
[0025] Specifically, when the utility model is used, after the external power grid loses power, the first-phase fuel engine 3 can be provided with a first-phase black start power supply 2 by adding a diesel generator 1, thereby operating the first-phase fuel engine 3. After the first-phase fuel engine 3 is successfully black started, sufficient electric energy can be provided, and the electric energy is transmitted to the first-phase main transformer 16 through a wire, and then the voltage is increased by the first-phase main transformer 16 and then transmitted to the first-phase bus 14. At the same time, the first-phase bus 14 transmits the voltage of 110kv to the high-voltage standby transformer 12 through a wire, and the high-voltage standby transformer 12 is used to increase the voltage of the first-phase main transformer 16. The voltage is stepped down to 6 kV by transformer 12 and then transmitted to the second phase plant bus 6. The second phase plant bus 6 transmits the voltage to the second phase gas turbine unit 5 and starts the second phase gas turbine unit 5. Then, the electricity generated by the second phase gas turbine unit 5 is transmitted to the main transformer 9 through the wire. The voltage is increased to 220 kV by the main transformer 9 and then transmitted to the second phase bus 10. At the same time, the electricity generated by the second phase gas turbine unit 5 is also transmitted to the second phase plant bus 6 through the high-voltage plant transformer 8, and the voltage adjusted by the high-voltage plant transformer 8 is transmitted to the second phase plant bus 6 for use.
[0026] The above are only preferred implementations of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.
[0027] Other parts of the present invention not described in detail belong to the prior art and will not be described in detail here.
[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. An improved gas-steam combined cascade black start unit, characterized in that: include: A diesel generator (1), a first-phase gas turbine (3) and a second-phase gas turbine set (5), wherein the diesel generator provides a first-phase black start power supply (2), the first-phase black start power supply (2) is electrically connected to the first-phase gas turbine (3), the input end of the second-phase gas turbine set (5) is connected to a second-phase plant bus (6), and the second-phase gas turbine set (5) is connected to a first booster station and a second booster station via the second-phase plant bus (6).
2. An improved gas-steam combined cascade black start unit as claimed in claim 1, characterized in that: The first substation comprises a first switch (7), a high-voltage plant transformer (8), a main transformer (9), and a second-phase busbar (10); the first switch (7) is electrically connected to the high-voltage plant transformer (8), the high-voltage plant transformer (8) is electrically connected to the main transformer (9), and the second-phase busbar (10) is electrically connected to the second-phase busbar (10).
3. An improved gas-steam combined cascade black start unit as claimed in claim 2, characterized in that: The first switch (7) is electrically connected to the second phase plant bus (6), the second phase bus (10) is 220kv, and the second phase plant bus (6) is 6kv.
4. The improved gas-steam combined cascade black start unit according to claim 1, characterized in that: The second substation comprises a third switch (11), a high-voltage standby transformer (12), a fourth switch (13), and a first-phase busbar (14); the third switch (11) is electrically connected to the high-voltage standby transformer (12); the high-voltage standby transformer (12) is electrically connected to the fourth switch (13); and the fourth switch (13) is electrically connected to the first-phase busbar (14).
5. The improved gas-steam combined cascade black start unit according to claim 4, characterized in that: The third switch (11) is electrically connected to the second phase plant bus (6), and the first phase bus (14) is 110 kV.
6. The improved gas-steam combined cascade black start unit according to claim 1, characterized in that: The first-phase gas turbine (3) is electrically connected to a second booster station, the second booster station comprises a fifth switch (15), a first-phase main transformer (16), and a sixth switch (17), the fifth switch (15) being electrically connected to the first-phase main transformer (16) and the first-phase gas turbine (3), respectively, the first-phase main transformer (16) being electrically connected to the sixth switch (17), and the sixth switch (17) being electrically connected to the first-phase bus (14).