A modularly designed gas turbine-adaptive power generation device

Abstract

This invention belongs to the field of power generation system design and discloses a gas turbine-adaptive power generation device based on modular design. The power generation device includes a gas turbine shaft, a gas turbine shaft gear, a system housing, n motors, multiple motor gears, a power device group, a supporting capacitor, a DC bus, and a drive device group. Through modular design, this invention uses n motors with power ratings of hundreds of kilowatts to form a megawatt-level generator system. The small radial dimension of each motor is more conducive to high-speed system operation. The parallel connection of the n motors enables overall system redundancy; even if a single motor fails, the remaining motors can still generate electricity normally. The operating states of different motors can be switched according to changes in load demand to achieve different operating modes.

Description

Technical Field

[0001] This invention belongs to the field of power generation system design, specifically relating to a gas turbine-adaptive power generation device based on modular design. Background Technology

[0002] To meet the high energy demands of heavy vehicles and large-tonnage ships, high-power-density gas turbines have become the preferred power source for these devices. Due to the high power (megawatt level) and high speed (over 20,000 rpm) characteristics of gas turbines, the power and speed of the matching generator systems must also continuously increase. However, current gas turbine generator systems with a capacity of megawatts or higher are extremely large: increasing the radial dimension of the generator leads to excessively high rotor linear speeds, making it unsuitable for higher speeds; increasing the axial dimension of the generator results in an excessively long axial dimension of the entire gas turbine generator system, making it unsuitable for the internal installation space of heavy vehicles, especially special-purpose vehicles. Therefore, research on high-power-density generator systems with rated gas turbines of 2MW or higher suitable for mobile transport platforms is almost nonexistent.

[0003] Chinese patent CN 110735713A provides a medium-to-high power split vehicle-mounted gas turbine generator set, which transports the generator vehicle mobile unit and the electrical control vehicle mobile unit separately. By fixing the electrical control vehicle chassis to the generator vehicle chassis, the power cables led out from the electrical control system are connected to the main body of the gas turbine and the main body of the generator through the power cable output interface to achieve high power output. However, this invention makes the power generation system bulky and cannot meet the requirements of miniaturization.

[0004] Chinese patent CN112682172A provides a vehicle-mounted emergency gas turbine generator set that integrates a traditional gas turbine generator set onto a truck. The truck engine power take-off serves as the pneumatic power source for the gas turbine, driving the hydraulic starting system to start the unit. It features high integration and maneuverability, solving the problem of poor road passability of high-power gas turbine generator sets in semi-trailer form. However, it does not design the generator system for high power and high speed.

[0005] Chinese patent CN113339138A provides a novel gas turbine generator. By fixing the motor rotor to the external casing of the gas turbine and the motor stator to the internal casing, the size and weight of the gas turbine generator set are reduced. However, this design does not consider that the large radial dimension will bring a large axial force when the rotor rotates at high speed, which may damage the bearings in severe cases and cause very serious vibration. In addition, the power generation system in this invention cannot reach the megawatt level. Summary of the Invention

[0006] To meet the requirements of heavy vehicles, large-tonnage ships and other mobile transport platforms for high power density, high speed, miniaturization and lightweight power generation systems, this invention proposes a gas turbine-adaptive power generation device based on modular design. Through modular design, the advantages of high power density, high speed adaptability and miniaturization of the gas turbine generator system are realized.

[0007] The technical solution of the present invention is as follows:

[0008] The first aspect of the present invention provides a gas turbine-adaptive power generation device based on modular design, the device including a gas turbine shaft 1, a gas turbine shaft gear 2, a system housing 3, n motors, multiple motor gears, a power device group 12, a support capacitor 13, a DC bus 14, and a drive device group 15;

[0009] The system housing 3 is a structure composed of n hollow cylindrical structures arranged in an array. The system housing 3 has a through hole in the center for installing a support capacitor. One motor is placed in each of the hollow cylindrical structures on the system housing 3. The front and rear surfaces of the system housing 3 are coaxially and fixedly connected to the front end cover 21 and rear end cover 22 of each motor, respectively. The support capacitor 13 is placed in the central through hole of the system housing 3, with its front end coinciding with the front surface of the system housing 3, and its rear end electrically connected to and fixed to the positive and negative terminals of the DC bus 14 through the support capacitor fixing nut.

[0010] All motors are installed in the system housing 3, and the N poles of the permanent magnets of the n motors are phase-differential. p is the number of pole pairs of the motor; each motor has a motor gear coaxially mounted on the extended end of the rotor shaft 17; each motor gear meshes with the gas turbine shaft gear 2;

[0011] The power device group 12 includes n groups of power devices, each group including 2m power devices. Every 2m power devices are evenly arranged and fixedly installed on the rear end cover 22 of each motor perpendicular to the axis of each motor, and are electrically connected to the DC bus 14. The drive device group 15 includes n groups of drive devices, each group including 2m drive devices. Every 2m drive devices are fixed on the surface of the DC bus 14 and are evenly arranged perpendicular to the axis of each motor, and are connected one by one to the power devices at the corresponding positions on the rear end cover 22 of each motor.

[0012] Furthermore, the number of motors n is greater than or equal to 2, and the motors are m-phase permanent magnet synchronous generators.

[0013] Furthermore, when the power of the gas turbine-adaptive power generation unit is Y MW, the motor is a permanent magnet synchronous generator with a power of Y / n MW.

[0014] Furthermore, the axial distance between adjacent motors is greater than the motor diameter.

[0015] Furthermore, the cross-section of the DC busbar 14 is a rounded rectangle, and the diameter of the rounded corners is the same as the diameter of the motor rear end cover 22.

[0016] A second aspect of the present invention provides a gas turbine-adaptive power generation device based on a modular design, the device comprising a gas turbine shaft 1, a gas turbine shaft gear 2, a system housing 3, a first motor 4, a first motor gear 5, a second motor 6, a second motor gear 7, a third motor 8, a third motor gear 9, a fourth motor 10, a fourth motor gear 11, a power device group 12, a support capacitor 13, a DC bus 14, and a drive device group 15;

[0017] The system housing 3 is composed of four hollow cylindrical structures arranged in a square array. The system housing 3 has a through hole in the center for installing a support capacitor. The first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 are respectively placed in the four hollow cylindrical structures on the system housing 3. The front and rear surfaces of the system housing 3 are coaxially fixedly connected to the front end cover 21 and the rear end cover 22 of each motor, respectively. The support capacitor 13 is placed in the central through hole of the system housing 3, with its front end overlapping the front surface of the system housing 3, and its rear end electrically connected and fixed to the positive and negative terminals of the DC bus 14 through the support capacitor fixing nut.

[0018] The first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 are placed inside the hollow cylindrical structure of the system housing 3; the angles of the two N poles of the four motors in the clockwise direction differ by 15°; the rotor shafts 17 of the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 are respectively coaxially mounted with the first motor gear 5, the second motor gear 7, the third motor gear 9, and the fourth motor gear 11; the first motor gear 5, the second motor gear 7, the third motor gear 9, and the fourth motor gear 11 mesh with the gas turbine shaft gear 2;

[0019] The power device group 12 includes four groups of power devices, each group including six power devices. The six power devices are evenly arranged and fixed on the rear end cover 22 of the four motors, perpendicular to the axes of the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10, and are electrically connected to the DC bus 14. The drive device group 15 includes four groups of drive devices, each group including six drive devices. The six drive devices are fixed on the surface of the DC bus 14, evenly arranged perpendicular to the axes of the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10, and are connected one by one to the power devices at the corresponding positions on the rear end cover 22 of each motor.

[0020] Furthermore, when the power of the gas turbine-adaptive power generation unit is Y MW, the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 are all permanent magnet synchronous generators with a power of Y / 4MW.

[0021] Furthermore, the side length of the square cross-section formed by the axes of the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 is greater than the diameter of the motor.

[0022] Furthermore, the cross-section of the DC busbar 14 is a rounded rectangle, and the diameter of the rounded corners is the same as the diameter of the motor rear end cover 22.

[0023] The present invention has the following advantages:

[0024] 1. This invention provides a gas turbine-adaptive power generation device based on modular design. The device, through modular design, consists of n motors with power levels of hundreds of kilowatts, forming a megawatt-level generator system. Each motor has a small radial dimension, which is more conducive to achieving high-speed operation of the system.

[0025] 2. This invention provides a gas turbine-adaptive power generation device based on modular design. The device combines hundreds of kilowatt-level generators to achieve megawatt-level power generation through modular design. Compared with a single megawatt-level generator, the axial dimension is smaller, realizing system miniaturization and making it more conducive to installation and layout in mobile transportation platforms such as vehicles and ships.

[0026] 3. This invention provides a gas turbine-adaptive power generation device based on modular design. Due to its modular design, the device can more easily achieve the functional effect of a multiphase generator by optimizing the phase angle relationship between the stator windings, rotors, gas turbine shaft gears, and motor gears of n motors through structural layout. This helps to reduce DC bus voltage fluctuations, improve power generation quality, and simplify the control strategy.

[0027] 4. This invention provides a gas turbine-adaptive power generation device based on modular design. By connecting n motors in parallel, the overall system redundancy can be achieved. Even if a single motor fails, the remaining motors can still generate electricity normally.

[0028] 5. This invention provides a gas turbine adaptive power generation device based on modular design, which can switch the working state of different motors according to changes in load demand, realize different working modes, start all motors to generate electricity when the load demand is high, and start only some motors to generate electricity when the load demand is low. This helps to make each motor work in its optimal efficiency range as much as possible, improve the overall power generation efficiency of the system, and achieve energy saving. Attached Figure Description

[0029] Figure 1 This is a three-dimensional schematic diagram of a gas turbine-adaptive power generation device based on modular design, as described in this embodiment.

[0030] Figure 2 This is a left view of the gas turbine-adaptive power generation unit based on a modular design in this embodiment;

[0031] Figure 3 This is a right view of the gas turbine-adaptive power generation unit based on modular design in this embodiment;

[0032] Figure 4 This is a cross-sectional view along line A-A' of the gas turbine-adaptive power generation unit based on modular design in this embodiment.

[0033] Figure 5 This is a cross-sectional view of the motor along line B-B' in this embodiment;

[0034] Figure 6 This is a three-dimensional schematic diagram of the system casing in this embodiment;

[0035] Figure 7 This is a waveform diagram of the opposite electromotive force A of the motor cross-section and the position of the permanent magnet poles in this embodiment;

[0036] Figure 8 These are the positions of the permanent magnet poles of the four motors in this embodiment;

[0037] Figure 9 This is the waveform diagram of the opposite potential of A in this embodiment;

[0038] Figure 10 This is the electrical connection diagram of the gas turbine-adaptive power generation device based on modular design in this embodiment.

[0039] In the picture:

[0040] 1-Gas turbine shaft, 2-Gas turbine shaft gear, 3-System housing, 4-First motor, 5-First motor gear, 6-Second motor, 7-Second motor gear, 8-Third motor, 9-Third motor gear, 10-Fourth motor, 11-Fourth motor gear, 12-Power device assembly, 13-Support capacitor, 14-DC busbar, 15-Drive device assembly, 16-Support capacitor fixing nut, 17-Rotor shaft, 18-Stator core, 19-Rotor core, 20-Winding, 21-Front end cover, 22-Rear end cover Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] like Figure 1As shown, the present invention discloses a modularly designed gas turbine-adaptive power generation device for a 2MW rated gas turbine, comprising a gas turbine shaft 1, a gas turbine shaft gear 2, a system housing 3, a first motor 4, a first motor gear 5, a second motor 6, a second motor gear 7, a third motor 8, a third motor gear 9, a fourth motor 10, a fourth motor gear 11, a power device group 12, a supporting capacitor 13, a DC bus 14, and a drive device group 15, wherein:

[0043] The first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 are all three-phase permanent magnet synchronous generators with a diameter of 280mm and a rated power of 500kW. Their B-B' cross-sectional view is shown below. Figure 5 As shown, each motor includes a rotor shaft 17, a stator core 18, a rotor core 19, windings 20, a front cover 21, and a rear cover 22. The rotor shaft 17 is mounted on the front cover 21 and the rear cover 22 of the motor via bearings.

[0044] like Figure 2 As shown, the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 are arranged in an array. The second motor 6 is located directly to the right of the first motor 4, and the distance between the axis of the second motor 6 and the axis of the first motor 4 is 300mm. The third motor 8 is located directly below the first motor 4, and the distance between the axis of the third motor 8 and the axis of the first motor 4 is 300mm. The fourth motor 10 is located directly below the second motor 6 and directly to the right of the third motor 8, and the distance between the axis of the fourth motor 10 and the axis of the second motor 6 is 300mm, and the distance between the axis of the third motor 8 and the axis of the second motor 6 is 300mm.

[0045] like Figure 1 As shown, the rotor shafts 17 of the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 are respectively coaxially mounted with the first motor gear 5, the second motor gear 7, the third motor gear 9, and the fourth motor gear 11. Figure 2 As shown, the first motor gear 5, the second motor gear 7, the third motor gear 9, and the fourth motor gear 11 mesh with the gas turbine shaft gear 2.

[0046] like Figure 6 As shown, the system housing 3 is a structure composed of four hollow cylinders arranged in an array and combined together, with a through hole in the center having the same diameter as the supporting capacitor.

[0047] like Figure 4As shown, the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 are respectively placed in the four hollow cylinders of the system housing 3. The front and rear surfaces of the system housing 3 are coaxially and fixedly connected to the front end cover 21 and the rear end cover 22 of the motors, respectively. The supporting capacitor 13 is placed in the central through hole of the system housing 3, with one end coinciding with the front surface of the system housing 3, and the other end electrically connected and fixed to the positive and negative terminals of the DC bus 14 through the supporting capacitor fixing nut 16. Figure 3 As shown.

[0048] like Figure 3 As shown, the DC busbar 14 has a rounded rectangular cross-section, with the rounded corner diameter being the same as the diameter of the motor rear end cover 22. The power device group 12 includes 6*4=24 power devices, with every six power devices arranged circumferentially perpendicular to the axes of the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10. They are fixedly mounted on the rear end covers 22 of the four motors and form an electrical connection with the DC busbar 14. Figure 10 As shown, the area within the dashed box is the DC busbar 14, through which the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 are connected in parallel.

[0049] The drive unit group 15 includes 6*4=24 drive units. Each group of six drive units is arranged circumferentially perpendicular to the axes of the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10. Each drive unit is connected to a power device on the rear end cover 22 of each motor and fixed to the DC bus 14. Figure 4 As shown.

[0050] like Figure 7 As shown, the first motor 4, the second motor 6, the third motor 8, and the fourth motor 10 are four-pole permanent magnet synchronous motors. When two N poles of the four permanent magnets are located directly above and below the figure, the waveform of the induced electromotive force of the A-phase winding when the motor rotates 180° clockwise is as follows. Figure 7 As shown.

[0051] In this embodiment, two of the N poles of the four permanent magnets of the first motor 4 are located directly above and directly below in the figure. Rotating the first motor 4 clockwise by 15°, 30°, and 45° respectively yields the placement of the second motor 6, the third motor 8, and the fourth motor 10, as shown below. Figure 8 As shown. According to Figure 8 The spatial arrangement of the four motors shown can be used to obtain the following: Figure 9 The diagram shows the induced electromotive force waveforms of the A, B, and C phase windings when all four motors rotate 180° clockwise simultaneously. The spatial structure design allows for adjustment of the phase angle of each motor, which helps reduce DC bus voltage fluctuations, improves power generation quality, and simplifies the control strategy.

[0052] Based on changes in load demand, the operating states of different motors are switched to achieve different operating modes. During periods of high load demand, all motors are activated to generate electricity, while during periods of low load demand, only some motors are activated. One possible implementation of this technical solution is as follows: Taking a four-in-one modular power generation device with a rated total power output of 2MW in this embodiment as an example, each generator in the device has a rated power output of 500kW.

[0053] 1. When the load demand is between 1500kW and 2000kW, activate 4 motors to share the power generation evenly;

[0054] 2. When the load demand is between 1000kW and 1500kW, the system power generation efficiency of the two schemes, "activating 4 generators to share the power generation equally" and "activating 3 generators to share the power generation equally", is compared through the control algorithm, and the scheme with the highest total power generation efficiency is selected for power generation.

[0055] 3. When the load demand is between 500kW and 1000kW, the overall power generation efficiency of the system is compared through the control algorithm for the three schemes of "activating 4 generators to share the power generation", "activating 3 generators to share the power generation", and "activating 2 generators to share the power generation", and the scheme with the highest overall power generation efficiency is selected for power generation.

[0056] 4. When the load demand is less than 500kW, the overall power generation efficiency of the system is compared through the control algorithm for the four schemes: “activating 4 generators to share the power generation”, “activating 3 generators to share the power generation”, “activating 2 generators to share the power generation”, and “activating 1 generator to bear all the power generation”. The scheme with the highest overall power generation efficiency is selected for power generation.

[0057] The present invention protects the redundant control of n motors, where n is greater than or equal to 2, meaning that all power generation systems with multiple motors are within the scope of protection of the present invention.

[0058] This invention protects the arrangement of multiple motors, including various motor arrangement methods such as flat arrangement and array arrangement.

Claims

1. A gas turbine-adaptive power generation device based on modular design, characterized in that, The device includes a gas turbine shaft (1), a gas turbine shaft gear (2), a system housing (3), n motors, multiple motor gears, a power device group (12), a support capacitor (13), a DC busbar (14), and a drive device group (15). The system housing (3) is a structure composed of n hollow cylindrical structures arranged in an array. The system housing (3) has a through hole in the center for installing a support capacitor. One motor is placed in each of the hollow cylindrical structures on the system housing (3). The front and rear surfaces of the system housing (3) are coaxially fixedly connected to the front end cover (21) and rear end cover (22) of each motor, respectively. The support capacitor (13) is placed in the central through hole of the system housing (3). The front end coincides with the front surface of the system housing (3), and the rear end is electrically connected to the positive and negative terminals of the DC bus 14 through the support capacitor fixing nut and fixed. All motors are installed in the system housing (3), and the N poles of the permanent magnets of the n motors are phase-differential. p is the number of pole pairs of the motor; each motor has a motor gear coaxially mounted on the extended end of the rotor shaft (17); each motor gear meshes with the gas turbine shaft gear (2); The power device group (12) includes n groups of power devices, each group including 2m power devices. Each 2m power device is evenly arranged perpendicular to the axis of each motor and fixedly installed on the rear end cover 22 of each motor, and forms an electrical connection with the DC bus (14). The drive device group (15) includes n groups of drive devices, each group including 2m drive devices. Each 2m drive device is fixed on the surface of the DC bus (14) and evenly arranged perpendicular to the axis of each motor, and connected one by one to the power device at the corresponding position on the rear end cover (22) of each motor. The number of motors, n, is greater than or equal to 2, and the motors are m-phase permanent magnet synchronous generators.

2. The gas turbine-adaptive power generation device based on modular design as described in claim 1, characterized in that, When the power of the gas turbine-adaptive power generation unit is Y MW, the motor is a permanent magnet synchronous generator with a power of Y / n MW.

3. The gas turbine-adaptive power generation device based on modular design as described in claim 2, characterized in that, The axial distance between adjacent motors is greater than the motor diameter.

4. The gas turbine-adaptive power generation device based on modular design as described in claim 1, characterized in that, The cross-section of the DC busbar (14) is a rounded rectangle, and the diameter of the rounded corner is the same as the diameter of the motor rear end cover (22).

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