Marine multifunctional hybrid power system and control method

Abstract

The invention discloses a multifunctional hybrid power system for a ship, relates to the field of ship power control, and solves the technical problems that an existing hybrid ship power system is high in oil consumption and single in function. The device comprises a controller, a motor driving module, an engine power module, an energy storage module, a range-extended power generation module and a propeller, the driving end of the motor driving module is in transmission connection with the propeller, the driving end of the engine power module is in transmission connection with the driving end of the motor driving module, the input and output end of the energy storage module is electrically connected with the input and output end of the motor driving module, and the input end of the energy storage module is electrically connected with the range-extended power generation module. And the motor driving module, the engine power module, the energy storage module and the extended-range power generation module are all electrically connected with the controller. The invention further discloses a control method of the marine multifunctional hybrid power system. According to the invention, the fuel economy of the power system and the flexibility of response to the power system under different loads are improved, and the braking energy recovery of the ship is realized.

Description

Technical Field

[0001] The present invention relates to the field of ship power control, and more specifically, to a ship-based multifunctional hybrid power system and a control method. Background Art

[0002] At present, domestic ship power systems are generally diesel or gas-powered. Users are more accepting of power systems with high mechanization structures, and the maintenance of this type of system is mature and reliable. However, it also has disadvantages such as high fuel consumption, high noise, and single function.

[0003] like Figure 1 As shown, conventional marine hybrid power is a series model configuration of engine + gearbox + generator. In this configuration, the engine is always working, and the engine needs to work in variable conditions according to load changes, which is not economical. At the same time, if one of the modules in the middle fails, the entire power system cannot work. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a marine multifunctional hybrid power system and a control method in view of the deficiencies of the prior art, so as to solve the technical problems of high fuel consumption and single function of the existing hybrid ship power system.

[0005] A multifunctional hybrid power system for a ship according to the present invention comprises a controller, a motor drive module, an engine power module, an energy storage module, a range-extending power generation module and a propeller;

[0006] The driving end of the motor drive module is transmission-connected to the propeller, the driving end of the engine power module is transmission-connected to the driving end of the motor drive module, the input and output ends of the energy storage module are electrically connected to the input and output ends of the motor drive module, the input end of the energy storage module is electrically connected to the extended-range power generation module, and the motor drive module, the engine power module, the energy storage module and the extended-range power generation module are all electrically connected to the controller.

[0007] As a further improvement, the range-extended power generation module includes a range-extended engine and a flywheel-integrated motor, the range-extended engine and the flywheel-integrated motor are transmission-connected, and the output end of the flywheel-integrated motor is electrically connected to the input end of the energy storage module.

[0008] Furthermore, the energy storage module is electrically connected to an AC load cabinet for use by conventional electrical equipment on board through an inverter.

[0009] Furthermore, the energy storage module is provided with an interface for connecting to a shore power module installed on the shore.

[0010] A control method using the above-mentioned marine multifunctional hybrid power system, obtaining the real-time power demand value of the marine engine as the power demand value of the motor drive module;

[0011] When the real-time power demand value is less than the set first driving power value, the engine power module and the range-extending power generation module are both inoperative, at which time the mechanical connection between the engine power module and the motor drive module is disconnected, and the energy storage module supplies power to the motor drive module to drive the propeller to operate;

[0012] When the real-time power demand value is between the set first driving power value and the second driving power value, the motor driving module does not participate in the electric driving and is only used for power transmission, and the engine power module outputs power that meets the real-time power demand;

[0013] When the real-time power demand value is greater than the second driving power value, the engine power module, the energy storage module and the extended-range power generation module simultaneously act on the motor drive module to meet the power of the real-time power demand.

[0014] As a further improvement, when the ship engine has no real-time power demand, the working mode of the motor drive module is switched to the power generation working mode, the propeller drives the motor drive module to generate electricity, and the electric energy generated by the motor drive module is stored in the energy storage module.

[0015] Furthermore, the real-time power of the energy storage module is obtained. When the real-time power of the energy storage module is less than or equal to a preset first power, the extended-range power generation module starts generating power and stores the generated electric energy in the energy storage module; until the real-time power of the energy storage module is greater than or equal to a preset second power.

[0016] Furthermore, when the ship engine is moored at the shore, the energy storage module is charged and stored through the shore power module.

[0017] Furthermore, the magnitude relationship between the first driving power value and the second driving power value is: first driving power value<second driving power value.

[0018] Furthermore, the duration of the time when the real-time power demand value is between the set first driving power value and the second driving power is obtained, and when the duration is greater than the set time, the engine power module continuously outputs power that meets the real-time power demand.

[0019] Beneficial Effects

[0020] The advantages of the present invention are:

[0021] The present invention arranges a motor drive module, a shore power module, an engine power module, an energy storage module and an extended-range power generation module. According to different ship engine loads, the extended-range power generation module is controlled to supply energy to the energy storage module, the shore power module is controlled to supply energy to the energy storage module, and the energy storage module is controlled to supply energy to the motor drive module, thereby driving the motor drive module or the engine power module to drive the propeller to start, alleviating the problems of high fuel consumption and high emissions caused by the engine power module in this field, and realizing the functions of pure engine drive, pure motor drive, engine and motor co-drive, energy recovery, load power supply and the like according to different working conditions; at the same time, even if the engine power module fails, it can also switch to the extended-range power generation and pure electric drive system mode, thereby improving the fuel economy and power distribution flexibility of the entire power system, realizing marine extended-range DC power generation and stable control, and realizing the braking energy recovery of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The on-site installation diagram for existing conventional marine hybrid power systems;

[0023] Figure 2 It is a schematic diagram of a multifunctional hybrid power system for a ship of the present invention;

[0024] Figure 3 It is a schematic diagram of the installation of the multifunctional hybrid power system for ships of the present invention;

[0025] Figure 4 A flow chart of a control method for a marine multifunctional hybrid power system of the present invention;

[0026] Figure 5 The figure is a simplified flow chart of the control method of the marine multifunctional hybrid power system of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0028] See also Figure 2-Figure 5 The present invention discloses a multifunctional hybrid power system for a ship, which includes a controller, a motor drive module, an engine power module, an energy storage module, a range-extended power generation module and a propeller.

[0029] The driving end of the motor drive module is transmission connected to the propeller, the driving end of the engine power module is transmission connected to the driving end of the motor drive module, the input and output ends of the energy storage module are electrically connected to the input and output ends of the motor drive module, the input end of the energy storage module is electrically connected to the extended-range power generation module, and the motor drive module, the engine power module, the energy storage module and the extended-range power generation module are all electrically connected to the controller.

[0030] The engine power module is connected to the motor drive module and the propulsion module through an axis, one end of which is fixedly connected to the propeller. The engine power module can output mechanical power to drive the propeller to rotate. At this time, the electric drive structure of the motor drive module does not participate in the electric drive and is only used for power transmission.

[0031] The extended-range power generation module includes an extended-range engine and a flywheel integrated motor, and the extended-range power generation module includes an extended-range engine and a flywheel integrated motor, and the extended-range engine and the flywheel integrated motor are transmission-connected. The extended-range power generation module always works in a constant power high-efficiency area, and it sends direct current to the energy storage module, so that the power of the energy storage module is always kept within a suitable SOC range. The minimum value of the suitable SOC range is the first power, and the maximum value of the SOC range is the second power.

[0032] The energy storage module is electrically connected to an AC load cabinet for use by conventional electrical equipment on board the ship through an inverter.

[0033] The energy storage module is provided with an interface for connecting to a shore power module installed on the shore. The shore power module installed on the shore can charge and store energy for the energy storage module.

[0034] A control method based on the above-mentioned marine multifunctional hybrid power system,

[0035] Obtain the real-time power demand value of the ship engine as the power demand value of the motor drive module;

[0036] When the real-time power demand value is less than the set first driving power value, the engine power module and the extended-range power generation module do not work. At this time, the mechanical connection between the engine power module and the motor drive module is disconnected, the clutch of the engine power module is separated, and the energy storage module supplies power to the motor drive module to drive the propeller to operate.

[0037] When the real-time power demand value is between the set first drive power value and the second drive power value, the motor drive module does not participate in electric drive and is only used for power transmission. The engine power module outputs power that meets the real-time power demand.

[0038] When the real-time power demand value is greater than the second driving power value, the engine power module, energy storage module and extended-range power generation module simultaneously act on the motor drive module to meet the real-time power demand, thereby meeting the large load requirements of the entire ship.

[0039] When the ship engine has no real-time power demand, the working mode of the motor drive module is switched to the power generation working mode, and the propeller drives the motor drive module to generate electricity, and the electric energy generated by the motor drive module is stored in the energy storage module. The upstream kinetic energy is recovered, the kinetic energy is converted into electrical energy and the energy storage system is charged, and the downstream braking function is realized at the same time.

[0040] The real-time power of the energy storage module is obtained. When the real-time power of the energy storage module is less than or equal to the preset first power, the extended-range power generation module starts to generate power and stores the generated electric energy in the energy storage module; until the real-time power of the energy storage module is greater than or equal to the preset second power. The flywheel integrated motor supplies DC power to the energy storage module through cables. The working mode of the extended-range power generation module is fixed-point efficient power generation, avoiding the high fuel consumption and high emissions of the extended-range engine.

[0041] The relationship between the first driving power value and the second driving power value is: first driving power value<second driving power value.

[0042] When the ship is moored at the shore, the shore power module supplies energy to the energy storage module through cables, further improving the economy of the overall system.

[0043] The duration when the real-time power demand value is between the set first driving power value and the second driving power is obtained. When the duration is greater than the set time, the engine power module continuously outputs power that meets the real-time power demand.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A multifunctional hybrid power system for a ship, characterized in that: It includes a controller, a motor drive module, an engine power module, an energy storage module, an extended-range power generation module, and a propeller; The driving end of the motor drive module is transmission-connected to the propeller, the driving end of the engine power module is transmission-connected to the driving end of the motor drive module, the input and output ends of the energy storage module are electrically connected to the input and output ends of the motor drive module, the input end of the energy storage module is electrically connected to the extended-range power generation module, and the motor drive module, the engine power module, the energy storage module and the extended-range power generation module are all electrically connected to the controller.

2. A multifunctional hybrid power system for a ship according to claim 1, characterized in that: The range-extended power generation module comprises a range-extended engine and a flywheel-integrated motor, the range-extended engine and the flywheel-integrated motor are transmission-connected, and the output end of the flywheel-integrated motor is electrically connected to the input end of the energy storage module.

3. A multifunctional hybrid power system for a ship according to claim 1, characterized in that: The energy storage module is electrically connected to an AC load cabinet for use by conventional electrical equipment on board via an inverter.

4. A multifunctional hybrid power system for a ship according to claim 1, characterized in that: The energy storage module is provided with an interface for connecting to a shore power module installed on the shore.

5. A control method for a marine multifunctional hybrid power system based on claims 1-4 above, characterized in that: Obtain the real-time power demand value of the ship engine as the power demand value of the motor drive module; When the real-time power demand value is less than the set first driving power value, the engine power module and the range-extending power generation module are both inoperative, at which time the mechanical connection between the engine power module and the motor drive module is disconnected, and the energy storage module supplies power to the motor drive module to drive the propeller to operate; When the real-time power demand value is between the set first driving power value and the second driving power value, the motor driving module does not participate in the electric driving and is only used for power transmission, and the engine power module outputs power that meets the real-time power demand; When the real-time power demand value is greater than the second driving power value, the engine power module, the energy storage module and the extended-range power generation module simultaneously act on the motor drive module to meet the power of the real-time power demand.

6. The control method of a multifunctional hybrid power system for a ship according to claim 5, characterized in that: When the ship engine has no real-time power demand, the working mode of the motor drive module is switched to the power generation working mode, the propeller drives the motor drive module to generate electricity, and the electric energy generated by the motor drive module is stored in the energy storage module.

7. The control method of a marine multifunctional hybrid power system according to claim 5, characterized in that: Acquiring the real-time power of the energy storage module, when the real-time power of the energy storage module is less than or equal to a preset first power, the extended-range power generation module starts to generate power and stores the generated electric energy in the energy storage module; Until the real-time power of the energy storage module is greater than or equal to the preset second power.

8. The control method of a multifunctional hybrid power system for a ship according to claim 7, characterized in that: The magnitude relationship between the first driving power value and the second driving power value is: first driving power value<second driving power value.

9. The control method of a marine multifunctional hybrid power system according to claim 5, characterized in that: When the ship engine is moored at the shore, the energy storage module is charged and stored through the shore power module.

10. The control method of a marine multifunctional hybrid power system according to claim 5, characterized in that: The duration when the real-time power demand value is between the set first driving power value and the second driving power is obtained. When the duration is greater than the set time, the engine power module continuously outputs power that meets the real-time power demand.

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