A three-unit excitation steam generator suitable for islanded grid operation

Abstract

This invention provides a three-unit excitation steam generator suitable for islanded grid operation, including a main generator and a main exciter located on one side of the main generator. A permanent magnet motor is installed at the end of the main exciter furthest from the main generator. The rotor shaft of the main generator and the permanent magnet motor, as well as the armature of the main exciter motor, are integrally formed. By installing the permanent magnet motor at one end of the main exciter motor, when the shaft is driven to rotate by the prime mover, the rotor of the permanent magnet motor rotates, causing the permanent magnet motor stator on the permanent magnet motor to supply power to the main exciter motor stator on the main exciter motor through the excitation regulator. This eliminates the need for the main exciter motor to obtain the electrical energy required for normal operation from the power grid, saving operating costs. By changing the traditional flange connection to an integrally formed structure of the rotor shaft of the main generator and the permanent magnet motor, the stability of current transmission on the shaft is improved.

Description

Technical Field

[0001] This invention relates to the field of generator technology, and specifically to a three-unit excitation steam generator suitable for islanded grid operation. Background Technology

[0002] For steam turbine generator sets operating on isolated islands, connecting them to the main power grid via conventional methods of erecting high-voltage power lines is costly, has high operation and maintenance costs, and also poses operational safety issues. Summary of the Invention

[0003] The purpose of this invention is to provide a three-unit excitation steam generator suitable for islanded grid operation, thereby overcoming the shortcomings of the prior art.

[0004] This invention is achieved through the following technical solution:

[0005] A three-generator excitation steam generator suitable for islanded grid operation includes a main generator and a main exciter located on one side of the main generator. A permanent magnet is installed at the end of the main exciter away from the main generator. The rotor shafts of the main generator and the permanent magnet, as well as the armature of the main exciter, are integrally formed.

[0006] By setting a permanent magnet at one end of the main exciter, when the shaft is driven to rotate by the prime mover, the rotor of the permanent magnet rotates and causes the permanent magnet stator on the permanent magnet to supply power to the main exciter stator on the main exciter through the excitation regulator. This allows the main exciter to operate normally without obtaining the power required by the power grid, thus saving operating costs.

[0007] By making the rotor shafts of the main generator and permanent magnet generator, as well as the main exciter armature of the main exciter, a single integral structure is formed, the traditional flange connection is avoided. This results in higher rigidity and a more compact structure for the entire excitation generator unit shaft system. Furthermore, the connection gap in the traditional flange connection has a significant impact on the stability of current conduction between the main generator rotor in the main generator and the main exciter armature in the main exciter. However, by making the rotor shafts of the main generator and permanent magnet generator a single integral structure, this problem can be completely avoided.

[0008] Furthermore, a generator bearing for fixing the rotating shaft is provided between the main generator and the main exciter, and a main exciter bearing for fixing the rotating shaft is provided between the main exciter and the permanent magnet.

[0009] Furthermore, the permanent magnet generator includes a housing, a permanent magnet stator disposed at one end of the housing, a permanent magnet rotor disposed in the middle of the inner cavity of the housing, and a fan disposed on the inner side wall of the housing for heat dissipation.

[0010] Furthermore, an air cooler is provided on the lower side of the main generator, and the air cooler consists of multiple coolers.

[0011] Furthermore, the rotating shaft is forged from high-strength, high-permeability alloy steel, and the rotor coil of the main generator is made of cold-drawn silver-containing copper wire.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0013] This invention relates to a three-excitation steam generator suitable for islanded grid operation. By setting a permanent magnet generator at one end of the main exciter, when the shaft is driven to rotate by the prime mover, the rotor of the permanent magnet generator rotates and causes the permanent magnet generator stator on the permanent magnet generator to supply power to the main exciter stator on the main exciter through the excitation regulator. This allows the main exciter to operate normally without obtaining the power required by the grid, thus saving operating costs.

[0014] This invention discloses a three-unit excitation steam generator suitable for islanded grid operation. By making the rotor shafts of the main generator and permanent magnet generator, as well as the main exciter armature of the main exciter, a single-piece structure is formed, the traditional flange connection is avoided. This results in higher rigidity and a more compact structure for the entire excitation steam generator's shaft system. Furthermore, the connection gap in the traditional flange connection has a significant impact on the stability of current conduction between the main generator rotor and the main exciter armature. By making the rotor shafts of the main generator and permanent magnet generator a single-piece structure, this problem can be completely avoided. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the permanent magnet motor structure of the present invention.

[0018] Figure 3 This is a schematic diagram illustrating the power generation principle of this invention.

[0019] The attached diagram shows the markings and corresponding component names:

[0020] 1-Main generator, 2-Generator bearing, 3-Main exciter, 4-Main exciter bearing, 5-Permanent magnet generator, 6-Air cooler, 7-Shaft, 51-Casing, 52-Permanent magnet generator stator, 53-Permanent magnet generator rotor, 54-Fan. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0023] Example 1

[0024] like Figure 1-3 As shown, this invention provides a three-unit excitation steam generator suitable for islanded grid operation. This invention is achieved through the following technical solution:

[0025] A three-generator excitation steam generator suitable for islanded grid operation includes a main generator 1 and a main exciter 4 disposed on one side of the main generator 1. A permanent magnet 5 is disposed at the end of the main exciter 3 away from the main generator 1. The rotor shaft 7 of the main generator 1 and the permanent magnet 5 and the main exciter armature of the main exciter 3 are integrally formed structures.

[0026] By setting a permanent magnet motor 5 at one end of the main exciter 3, when the rotating shaft 7 is driven to rotate by the prime mover, the rotor of the permanent magnet motor 5 rotates and causes the permanent magnet stator on the permanent magnet motor 5 to supply power to the main exciter stator on the main exciter 3 through the excitation regulator. This allows the main exciter 3 to operate normally without obtaining the power required by the power grid, thus saving operating costs.

[0027] By making the rotor shafts 7 of the main generator 1 and permanent magnet generator 5, as well as the main exciter armature of the main exciter 3, an integrally formed structure is adopted, thus avoiding the traditional flange connection. This results in higher rigidity and a more compact structure for the entire excitation generator unit shaft system. Furthermore, the connection gap in the traditional flange connection has a significant impact on the stability of current conduction between the main generator rotor in the main generator 1 and the main exciter armature in the main exciter 3. However, by making the rotor shafts 7 of the main generator 1 and permanent magnet generator 5 an integrally formed structure, this problem can be completely avoided.

[0028] Example 2

[0029] Based on Embodiment 1, a generator bearing 2 for fixing the rotating shaft 7 is provided between the main generator 1 and the main exciter 3, and a main exciter bearing 4 for fixing the rotating shaft 7 is provided between the main exciter 3 and the permanent magnet 5.

[0030] The permanent magnet generator 5 includes a housing 51, a permanent magnet generator stator 52 disposed at one end of the housing 51, a permanent magnet generator rotor 53 disposed in the middle of the inner cavity of the housing 51, and a fan 54 disposed on the inner side wall of the housing 51 for heat dissipation.

[0031] An air cooler 6 is provided on the lower side of the main generator 1, and the air cooler 6 is composed of multiple coolers.

[0032] The rotating shaft 7 is forged from high-strength, high-permeability alloy steel, and the rotor coil of the main generator 1 is made of cold-drawn silver-containing copper wire.

[0033] This invention discloses a three-unit excitation steam generator suitable for islanded grid operation. By installing a permanent magnet generator 5 at one end of the main exciter 3, when the shaft 7 is driven to rotate by the prime mover, the rotor of the permanent magnet generator 5 rotates, causing the permanent magnet stator on the permanent magnet generator 5 to supply power to the main exciter stator on the main exciter 3 through the excitation regulator. This eliminates the need for the main exciter 3 to obtain the power required for normal operation from the grid, saving operating costs. By making the shaft 7 of the rotor in the main generator 1 and the permanent magnet generator 5, as well as the main exciter armature in the main exciter 3, a single-piece structure is formed, avoiding traditional flange connections. This results in higher rigidity and a more compact structure for the entire excitation steam generator's shaft system. Furthermore, the connection gap in traditional flange connections significantly affects the stability of current conduction between the main generator rotor in the main generator 1 and the main exciter armature in the main exciter 3. By making the shaft 7 of the rotor in the main generator 1 and the permanent magnet generator 5 a single-piece structure, this problem can be completely avoided.

[0034] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A three-generator excitation steam generator suitable for islanded grid operation, comprising a main generator (1) and a main exciter (3) disposed on one side of the main generator (1), characterized in that, The main exciter (3) is equipped with a permanent magnet (5) at the end away from the main generator (1). The rotor shaft (7) of the main generator (1) and the permanent magnet (5) and the main exciter armature of the main exciter (3) are integrally formed. By setting a permanent magnet (5) at one end of the main exciter (3), when the shaft (7) is driven to rotate by the prime mover, the rotor of the permanent magnet (5) rotates and the permanent magnet stator on the permanent magnet (5) supplies power to the main exciter stator on the main exciter (3) through the excitation regulator, so that the main exciter (3) does not need to obtain the power required for normal operation through the power grid, thus saving operating costs.

2. A three-unit excitation steam generator suitable for islanded grid operation according to claim 1, characterized in that, A generator bearing (2) for fixing the rotating shaft (7) is provided between the main generator (1) and the main exciter (3), and a main exciter bearing (4) for fixing the rotating shaft (7) is provided between the main exciter (3) and the permanent magnet (5).

3. A three-unit excitation steam generator suitable for islanded grid operation according to claim 1, characterized in that, The permanent magnet motor (5) includes a housing (51), a permanent magnet stator (52) disposed at one end of the housing (51), a permanent magnet rotor (53) disposed in the middle of the inner cavity of the housing (51), and a fan (54) disposed on the inner side wall of the housing (51) for heat dissipation.

4. A three-unit excitation steam generator suitable for islanded grid operation according to claim 1, characterized in that, An air cooler (6) is provided on the lower side of the main generator (1), and the air cooler (6) is composed of multiple coolers.

5. A three-unit excitation steam generator suitable for islanded grid operation according to claim 1, characterized in that, The rotating shaft (7) is forged from high-strength, high-permeability alloy steel, and the rotor coil of the main generator (1) is made of cold-drawn silver-containing copper wire.

Images