Power unit with two power generation modes and control method

Abstract

The invention discloses a power unit with two power generation modes and a control method, and belongs to the technical field of power generation equipment.The power unit comprises a transfer case, a diesel engine, a permanent magnet generator, a first controller, an excitation generator and a second controller, the transfer case is respectively connected with the permanent magnet generator and the excitation generator, the permanent magnet generator is connected with the first controller, the excitation generator is connected with the second controller, and the permanent magnet generator and the excitation generator are connected in parallel. According to the invention, the permanent magnet generator can be controlled to stop generating power after the battery fails, and the excitation generator works in a constant-voltage power generation mode to provide electric energy, so that high dynamic characteristics can still be provided in a battery failure state, and load requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation equipment, and in particular to a power unit with two power generation modes and a control method thereof. Background Art

[0002] Currently, the power unit equipped on ground equipment is only equipped with a permanent magnet generator and controller, which generally works in constant power mode. It cannot work independently after a battery failure, and the constant voltage output dynamic characteristics cannot meet the requirements.

[0003] A Chinese patent document with publication number CN204851538U and publication date December 9, 2015 discloses a multi-motor generator and a wind turbine generator set, the multi-motor generator comprising a transfer case, a first motor and a second motor, wherein: the transfer case comprises an input shaft, a first output shaft and a second output shaft; the first output shaft is connected to the first motor, the second output shaft is connected to the second motor, and only the first motor of the first motor and the second motor is connected to a converter, and the converter connected to the first motor can adjust the electric power of the second motor.

[0004] The multi-motor generator and wind turbine generator set disclosed in this patent document realize variable speed operation control of a larger power wind turbine generator set through a smaller power converter, thereby reducing system costs and having the advantages of low manufacturing difficulty and good reliability.

[0005] A Chinese patent document with publication number CN204415151U and publication date June 24, 2015 discloses an energy-saving and environment-friendly vehicle-mounted generator, which is characterized in that: a chassis gearbox is connected to a power input gear in a transfer case through a transmission shaft 1, a cylinder is connected to a synchronous gear inside the transfer case, the synchronous gear is separated from or meshed with the power input gear and the power output gear, the power output gear is connected to a shaft, the shaft is connected to a generator, the cylinder is connected to a synchronous ring inside the transfer case, the synchronous ring is used to separate or connect the front gear and the rear gear, the rear gear is connected to a transmission shaft 2, and the transmission shaft 2 is connected to a rear drive axle of the chassis.

[0006] The energy-saving and environment-friendly vehicle-mounted power generation device disclosed in this patent document can generate electricity when the vehicle is in driving state or parked state, can make full use of vehicle-mounted resources, improve structural energy efficiency, and save energy consumption.

[0007] The prior art represented by the above patent documents all have the problem of being unable to work independently after a battery failure, and the constant voltage output dynamic characteristics cannot meet the requirements. Summary of the invention

[0008] In order to overcome the defects of the above-mentioned prior art, the present invention provides a power unit with two power generation modes and a control method. The present invention can control the permanent magnet generator to stop generating electricity after a battery failure, and the excitation generator operates in a constant voltage power generation mode to provide electrical energy, thereby ensuring that higher dynamic characteristics can still be provided in the battery failure state to adapt to load requirements.

[0009] The present invention is achieved through the following technical solutions: A power unit with two power generation modes includes a transfer case, characterized in that it also includes a diesel engine, a permanent magnet generator, a first controller, an excitation generator and a second controller, the diesel engine is connected to the transfer case, the transfer case is respectively connected to the permanent magnet generator and the excitation generator, the permanent magnet generator is connected to the first controller, the excitation generator is connected to the second controller, and the permanent magnet generator and the excitation generator are connected in parallel.

[0010] The transfer case comprises an input shaft, a first transmission shaft and a second transmission shaft, wherein the input shaft is connected to the diesel engine, the first transmission shaft is connected to the permanent magnet generator, and the second transmission shaft is connected to the excitation generator.

[0011] A control method for a power unit with two power generation modes, characterized by comprising the following steps: S1. After receiving the start command, the power unit triggers the corresponding power generation mode according to the start command; S2, the permanent magnet generator is rectified by the first controller, and the excitation generator is rectified by the second controller; S3, the permanent magnet generator and the excitation generator are connected in parallel after rectification to form one output.

[0012] In step S1, the startup instruction includes a power request instruction and a voltage request instruction.

[0013] In the step S1, the power generation mode includes a constant power generation mode, a constant voltage generation mode and a redundant power generation mode.

[0014] The constant power generation mode refers to starting the permanent magnet generator and shutting down the excitation generator, and the permanent magnet generator controls the output power to generate electricity according to the received power request instruction.

[0015] The constant voltage power generation mode refers to shutting down the permanent magnet generator and starting the excitation generator, and the excitation generator controls the output voltage to generate electricity through the received voltage request instruction.

[0016] The redundant power generation mode refers to starting the permanent magnet generator and the excitation generator at the same time, with the permanent magnet generator serving as the main generator and the excitation generator serving as the secondary generator. The excitation generator controls the power generation voltage to be the lower working limit voltage of the system. When the permanent magnet generator fails and the system voltage drops to the output voltage of the excitation generator, the excitation generator generates electricity.

[0017] An application of a power unit having two power generation modes is applicable to a vehicle chassis.

[0018] The invention discloses an application of a power unit with two power generation modes, which is suitable for power generation equipment equipped with a power generation system.

[0019] The beneficial effects of the present invention are mainly manifested in the following aspects: 1. In the present invention, the diesel engine is connected to the transfer case, the transfer case is respectively connected to the permanent magnet generator and the excitation generator, the permanent magnet generator is connected to the first controller, the excitation generator is connected to the second controller, and the permanent magnet generator and the excitation generator are connected in parallel. Compared with the prior art, the permanent magnet generator can be controlled to stop generating electricity after a battery failure, and the excitation generator works in a constant voltage power generation mode to provide electrical energy, thereby ensuring that higher dynamic characteristics can still be provided in the battery failure state to adapt to load requirements.

[0020] 2. In the present invention, the transfer case includes an input shaft, a first transmission shaft and a second transmission shaft. The input shaft is connected to the diesel engine, the first transmission shaft is connected to the permanent magnet generator, and the second transmission shaft is connected to the excitation generator. The transfer case transmission is adopted, so that the power generation mode of the entire power unit can be selected more freely, which is conducive to ensuring the reliability of power generation.

[0021] 3. The power unit of the present invention has a simple overall structure, low manufacturing cost and is easy to maintain.

[0022] 4. In the present invention, S1, after the power unit receives the start command, the corresponding power generation mode is triggered according to the start command; S2, the permanent magnet generator is rectified by the first controller, and the excitation generator is rectified by the second controller; S3, the permanent magnet generator and the excitation generator are connected in parallel to form one output after rectification. Compared with the prior art, the power generation mode is more flexible to adapt to different load requirements and has good applicability.

[0023] 5. In the present invention, the redundant power generation mode refers to starting the permanent magnet generator and the excitation generator at the same time, with the permanent magnet generator serving as the main generator and the excitation generator serving as the secondary generator. The excitation generator controls the power generation voltage to be the lower working limit voltage of the system. When the permanent magnet generator fails and the system voltage drops to the output voltage of the excitation generator, the excitation generator generates electricity, which can play the role of power hot backup and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementations, wherein: Figure 1 is a structural block diagram of a power unit of the present invention; Figure 2 It is a control flow chart of the power unit of the present invention; Markings in the figure: 1. transfer case, 2. diesel engine, 3. permanent magnet generator, 4. first controller, 5. excitation generator, 6. second controller. DETAILED DESCRIPTION

[0025] Example 1 See also Figure 1 A power unit with two power generation modes includes a transfer case 1, a diesel engine 2, a permanent magnet generator 3, a first controller 4, an excitation generator 5 and a second controller 6, wherein the diesel engine 2 is connected to the transfer case 1, the transfer case 1 is respectively connected to the permanent magnet generator 3 and the excitation generator 5, the permanent magnet generator 3 is connected to the first controller 4, the excitation generator 5 is connected to the second controller 6, and the permanent magnet generator 3 and the excitation generator 5 are connected in parallel.

[0026] This embodiment is the most basic implementation method. The diesel engine 2 is connected to the transfer case 1, and the transfer case 1 is connected to the permanent magnet generator 3 and the excitation generator 5 respectively. The permanent magnet generator 3 is connected to the first controller 4, and the excitation generator 5 is connected to the second controller 6. The permanent magnet generator 3 and the excitation generator 5 are connected in parallel. Compared with the prior art, the permanent magnet generator 3 can be controlled to stop generating electricity after a battery failure, and the excitation generator 5 works in a constant voltage power generation mode to provide electrical energy, thereby ensuring that higher dynamic characteristics can still be provided in the battery failure state to adapt to load requirements.

[0027] Example 2 See also Figure 1 A power unit with two power generation modes includes a transfer case 1, a diesel engine 2, a permanent magnet generator 3, a first controller 4, an excitation generator 5 and a second controller 6, wherein the diesel engine 2 is connected to the transfer case 1, the transfer case 1 is respectively connected to the permanent magnet generator 3 and the excitation generator 5, the permanent magnet generator 3 is connected to the first controller 4, the excitation generator 5 is connected to the second controller 6, and the permanent magnet generator 3 and the excitation generator 5 are connected in parallel.

[0028] Preferably, the transfer case 1 comprises an input shaft, a first transmission shaft and a second transmission shaft, the input shaft is connected to the diesel engine 2 , the first transmission shaft is connected to the permanent magnet generator 3 , and the second transmission shaft is connected to the excitation generator 5 .

[0029] This embodiment is a preferred implementation method. The transfer case 1 includes an input shaft, a first transmission shaft and a second transmission shaft. The input shaft is connected to the diesel engine 2, the first transmission shaft is connected to the permanent magnet generator 3, and the second transmission shaft is connected to the excitation generator 5. The transfer case 1 is used for transmission, so that the power generation mode of the entire power unit can be selected more freely, which is conducive to ensuring the reliability of power generation.

[0030] Example 3 See also Figure 1 and Figure 2, a control method for a power unit having two power generation modes, comprising the following steps: S1. After receiving the start command, the power unit triggers the corresponding power generation mode according to the start command; S2, the permanent magnet generator 3 is rectified by the first controller 4, and the excitation generator 5 is rectified by the second controller 6; S3, permanent magnet generator 3 and excitation generator 5 are connected in parallel after rectification to form one output.

[0031] Example 4 See also Figure 1 and Figure 2 , a control method for a power unit having two power generation modes, comprising the following steps: S1. After receiving the start command, the power unit triggers the corresponding power generation mode according to the start command; S2, the permanent magnet generator 3 is rectified by the first controller 4, and the excitation generator 5 is rectified by the second controller 6; S3, permanent magnet generator 3 and excitation generator 5 are connected in parallel after rectification to form one output.

[0032] Preferably, in step S1, the start-up instruction includes a power request instruction and a voltage request instruction.

[0033] In the step S1, the power generation mode includes a constant power generation mode, a constant voltage generation mode and a redundant power generation mode.

[0034] This embodiment is another preferred implementation mode. The overall structure of the power unit is simple, the manufacturing cost is low, and it is easy to maintain.

[0035] Example 5 See also Figure 1 and Figure 2 , a control method for a power unit having two power generation modes, comprising the following steps: S1. After receiving the start command, the power unit triggers the corresponding power generation mode according to the start command; S2, the permanent magnet generator 3 is rectified by the first controller 4, and the excitation generator 5 is rectified by the second controller 6; S3, permanent magnet generator 3 and excitation generator 5 are connected in parallel after rectification to form one output.

[0036] In step S1, the startup instruction includes a power request instruction and a voltage request instruction.

[0037] In the step S1, the power generation mode includes a constant power generation mode, a constant voltage generation mode and a redundant power generation mode.

[0038] The constant power generation mode refers to starting the permanent magnet generator 3 and shutting down the excitation generator 5, and the permanent magnet generator 3 controls the output power to generate electricity according to the received power request instruction.

[0039] Example 6 See also Figure 1 and Figure 2 , a control method for a power unit having two power generation modes, comprising the following steps: S1. After receiving the start command, the power unit triggers the corresponding power generation mode according to the start command; S2, the permanent magnet generator 3 is rectified by the first controller 4, and the excitation generator 5 is rectified by the second controller 6; S3, permanent magnet generator 3 and excitation generator 5 are connected in parallel after rectification to form one output.

[0040] In step S1, the startup instruction includes a power request instruction and a voltage request instruction.

[0041] In the step S1, the power generation mode includes a constant power generation mode, a constant voltage generation mode and a redundant power generation mode.

[0042] Further preferably, the constant power generation mode refers to starting the permanent magnet generator 3 and shutting down the excitation generator 5, and the permanent magnet generator 3 controls the output power to generate electricity through the received power request instruction.

[0043] The constant voltage power generation mode means turning off the permanent magnet generator 3 and starting the excitation generator 5, and the excitation generator 5 controls the output voltage to generate electricity according to the received voltage request instruction.

[0044] This embodiment is another preferred implementation mode. S1. After the power unit receives the start command, the corresponding power generation mode is triggered according to the start command; S2. The permanent magnet generator 3 is rectified by the first controller 4, and the excitation generator 5 is rectified by the second controller 6; S3. The permanent magnet generator 3 and the excitation generator 5 are connected in parallel to form one output after rectification. Compared with the prior art, the power generation mode is more flexible to adapt to different load requirements and has good applicability.

[0045] Example 7 See also Figure 1 and Figure 2 , a control method for a power unit having two power generation modes, comprising the following steps: S1. After receiving the start command, the power unit triggers the corresponding power generation mode according to the start command; S2, the permanent magnet generator 3 is rectified by the first controller 4, and the excitation generator 5 is rectified by the second controller 6; S3, permanent magnet generator 3 and excitation generator 5 are connected in parallel after rectification to form one output.

[0046] In step S1, the startup instruction includes a power request instruction and a voltage request instruction.

[0047] In the step S1, the power generation mode includes a constant power generation mode, a constant voltage generation mode and a redundant power generation mode.

[0048] The constant power generation mode refers to starting the permanent magnet generator 3 and shutting down the excitation generator 5, and the permanent magnet generator 3 controls the output power to generate electricity according to the received power request instruction.

[0049] The constant voltage power generation mode means turning off the permanent magnet generator 3 and starting the excitation generator 5, and the excitation generator 5 controls the output voltage to generate electricity according to the received voltage request instruction.

[0050] The redundant power generation mode refers to starting the permanent magnet generator 3 and the excitation generator 5 at the same time, with the permanent magnet generator 3 serving as the main generator and the excitation generator 5 serving as the secondary generator. The excitation generator 5 controls the power generation voltage to be the lower working limit voltage of the system. When the permanent magnet generator 3 fails and the system voltage drops to the output voltage of the excitation generator 5, the excitation generator 5 completes power generation.

[0051] This embodiment is the best implementation mode. The redundant power generation mode refers to starting the permanent magnet generator 3 and the excitation generator 5 at the same time. The permanent magnet generator 3 serves as the main generator and the excitation generator 5 serves as the secondary generator. The excitation generator 5 controls the power generation voltage to be the lower working limit voltage of the system. When the permanent magnet generator 3 fails and the system voltage drops to the output voltage of the excitation generator 5, the excitation generator 5 completes power generation, which can play the role of power hot backup and has high reliability.

[0052] The basic principles of the present invention are as follows: After the power output of the diesel engine 2 enters the transfer case 1, it drives the permanent magnet generator 3 through the first transmission shaft of the transfer case 1, and drives the excitation generator 5 through the second transmission shaft of the transfer case 1. The permanent magnet generator 3 is rectified by the first controller 4, and the excitation generator 5 is rectified by the second controller 6. After rectification, they are connected in parallel to form one output; The diesel engine 2 is used to divide the power into two paths through the transfer case 1, and then drives the permanent magnet generator 3 and the excitation generator 5 to work respectively. After the battery fails, the permanent magnet generator 3 can be controlled to stop generating electricity, and the excitation generator 5 works in a constant voltage power generation mode to provide electrical energy, thereby ensuring that high dynamic characteristics are still provided in the battery failure state to adapt to load requirements.

Claims

1. A power unit with two power generation modes, comprising a transfer case (1), characterized in that: The invention also comprises a diesel engine (2), a permanent magnet generator (3), a first controller (4), an excitation generator (5) and a second controller (6); the diesel engine (2) is connected to a transfer case (1); the transfer case (1) is respectively connected to the permanent magnet generator (3) and the excitation generator (5); the permanent magnet generator (3) is connected to the first controller (4); the excitation generator (5) is connected to the second controller (6); and the permanent magnet generator (3) and the excitation generator (5) are connected in parallel.

2. A power unit with two power generation modes according to claim 1, characterized in that: The transfer case (1) comprises an input shaft, a first transmission shaft and a second transmission shaft, the input shaft being connected to the diesel engine (2), the first transmission shaft being connected to the permanent magnet generator (3), and the second transmission shaft being connected to the excitation generator (5).

3. A control method for a power unit having two power generation modes, characterized in that: The following steps are involved: S1. After receiving the start command, the power unit triggers the corresponding power generation mode according to the start command; S2, the permanent magnet generator (3) is rectified by the first controller (4), and the excitation generator (5) is rectified by the second controller (6); S3, the permanent magnet generator (3) and the excitation generator (5) are connected in parallel after rectification to form one output.

4. The control method of a power unit with two power generation modes according to claim 3, characterized in that: In step S1, the startup instruction includes a power request instruction and a voltage request instruction.

5. The control method of a power unit with two power generation modes according to claim 3, characterized in that: In the step S1, the power generation mode includes a constant power generation mode, a constant voltage generation mode and a redundant power generation mode.

6. The control method of a power unit with two power generation modes according to claim 5, characterized in that: The constant power generation mode refers to starting the permanent magnet generator (3) and shutting down the excitation generator (5), wherein the permanent magnet generator (3) controls the output power to generate electricity through the received power request instruction.

7. The control method of a power unit with two power generation modes according to claim 5, characterized in that: The constant voltage power generation mode refers to shutting down the permanent magnet generator (3) and starting the excitation generator (5), wherein the excitation generator (5) controls the output voltage to generate electricity through the received voltage request instruction.

8. The control method of a power unit with two power generation modes according to claim 5, characterized in that: The redundant power generation mode refers to starting the permanent magnet generator (3) and the excitation generator (5) simultaneously, with the permanent magnet generator (3) serving as the main generator and the excitation generator (5) serving as the secondary generator. The excitation generator (5) controls the power generation voltage to be the lower limit voltage of the system operation. When the permanent magnet generator (3) fails and the system voltage drops to the output voltage of the excitation generator (5), the excitation generator (5) completes power generation.

9. An application of a power unit with two power generation modes, characterized in that: Suitable for vehicle chassis.

10. An application of a power unit with two power generation modes, characterized in that: Applicable to power generation equipment equipped with power generation system.

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