Marine hybrid power system and control method

Abstract

The application discloses a marine diesel-electric hybrid power system which is composed of a left and right diesel-electric hybrid power system topology and a right diesel-electric hybrid power system topology, and discloses a control method thereof. According to the sailing state of a ship and the electric quantity of a power battery, the operation and conversion of six working conditions of the ship, i.e., an anchoring value shift working condition, a mute working condition, a cruising working condition, a high-speed sailing working condition, a full-speed working condition and a braking working condition, are selected, so that the comprehensive efficiency and fuel economy of the power system of the ship are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of ship power technology, and particularly relates to a new energy ship hybrid power system and a control method. BACKGROUND

[0002] In order to effectively control the environmental pollution of ships and effectively maintain the ecological environment of oceans and lakes, the relevant departments of the state put forward the new development concept of "low-carbon economy" and green shipbuilding. The power system of the ship is developing from the traditional diesel engine single drive to the hybrid power system and pure electric system, which solves the problem of power and electricity use of the ship and achieves the purpose of energy saving and emission reduction. In recent years, the energy density and charge-discharge rate of lithium ion power batteries have been greatly improved, the torque density and power density of driving motors have made great progress, and lithium ion power batteries and driving motors are widely used in the field of electric vehicles. Using lithium ion power batteries as the energy storage medium of the ship, combining diesel engine groups and driving motors, and organically combining the energy saving and environmental protection performance of the ship power, the hybrid power new ship is the inevitable development trend in the future.

[0003] The required power of the ship during navigation requires a very large span, therefore, it is urgent to solve how to build a ship hybrid power system, configure the parameters of the diesel engine, the motor and the lithium battery group, and use an intelligent control method to play the advantages of each device of the power system, thereby improving the energy saving and emission reduction ability of the ship power system. The ship hybrid power system and the control method still need further breakthrough research. SUMMARY

[0004] One of the purposes of the present application is to provide a ship hybrid power system, which realizes the energy efficient distribution of the diesel-electric hybrid ship power and the power system, and improves the comprehensive efficiency and fuel economy of the ship power system.

[0005] The technical scheme adopted by the present application to solve its technical problems is: a marine diesel-electric hybrid power system is composed of a left side diesel-electric hybrid power system topology and a right side diesel-electric hybrid power system topology; the left side diesel-electric hybrid power system topology comprises a left side gear box connected with a left side propeller, a left side main clutch and a left side parallel clutch connected with the left side gear box respectively, a left side series motor connected with the left side main clutch and used as a left side generator motor, a left side diesel engine and a left side inverter connected with the left side series motor and used as a left side main propulsion device, a lithium ion left side power battery connected with the left side inverter and used as a power supply for a ship, a left side propulsion motor connected with the left side parallel clutch, and the left side propulsion motor connected with the left side inverter in sequence and used for ship navigation; the right side diesel-electric hybrid power system topology comprises a right side gear box connected with a right side propeller, a right side main clutch and a right side parallel clutch connected with the right side gear box respectively, a right side series motor connected with the right side main clutch and used as a right side generator motor, a right side diesel engine and a right side inverter connected with the right side series motor and used as a right side main propulsion device, a lithium ion right side power battery connected with the right side inverter and used as a power supply for a ship, a right side propulsion motor connected with the right side parallel clutch, and the right side propulsion motor connected with the right side inverter in sequence and used for ship navigation; the left side inverter and the left side power battery are connected with a left side DC bus through a left side fuse, the left side inverter is connected with the left side DC bus through a left side fuse, the left side inverter is connected with a left side AC bus through a left side circuit breaker, the right side inverter and the right side power battery are connected with a right side DC bus through a right side fuse, the right side inverter is connected with the right side DC bus through a right side fuse, the right side inverter is connected with a right side AC bus through a right side circuit breaker, the left side DC bus is connected with the right side DC bus through a circuit breaker, the left side AC bus is connected with the right side AC bus through a circuit breaker, and the AC bus is connected with shore power through a circuit breaker.

[0006] The second object of the present application is to provide a control method of a marine hybrid power system, according to the ship navigation state and the power battery capacity, the following steps are completed by selecting one of the following ways:

[0007] When the left side power battery and the right side power battery have a capacity lower than a set value, the ship has no navigation demand, the system starts a charging mode, the left side diesel engine and the right side diesel engine are stopped, all clutches are disconnected, the left side circuit breaker, the circuit breaker and the right side circuit breaker are closed, the circuit breaker is disconnected, the left side power battery and the right side power battery are charged by shore power respectively, and the battery capacity is supplemented to enter the ship anchoring value condition;

[0008] When the power of the left side power battery and the right side power battery is higher than the set value, the power required for driving the whole ship by the left side propulsion motor or the right side propulsion motor can be met respectively, the diesel engine is not started, the output power of the power battery adopts pure electric propulsion, the left side main clutch and the right side main clutch are arranged separately, the left side parallel clutch and the right side parallel clutch are arranged in parallel, the left side propulsion motor and the right side propulsion motor run to propel the ship to sail, and the ship enters a silent working condition;

[0009] When the left side diesel engine or the right side diesel engine is started, the left side series motor or the right side series motor is operated to generate electricity, the left side propulsion motor or the right side propulsion motor is operated to run in electricity, the ship is propelled to sail, the left side power battery and the right side power battery are charged at the same time, and the ship enters a cruising working condition;

[0010] The left side diesel engine and the right side diesel engine directly propel the ship to sail, the left side main clutch and the right side main clutch are arranged in parallel, the left side parallel clutch and the right side parallel clutch are arranged separately, the left side propulsion motor and the right side propulsion motor do not run, when the power of the left side power battery and the right side power battery is insufficient, the series left side series motor and the series right side series motor are started to generate electricity, the left side power battery or the right side power battery is charged, the ship enters a high-speed sailing working condition, and the demand for speed and torque is basically in the high-efficiency working area of the diesel engine;

[0011] When the ship is in a sailing against water, rapid acceleration or other working condition, the power of the left side power battery and the right side power battery is sufficient, in order to improve the maneuverability of the ship, the system selects the propulsion motor and the diesel engine to run at the same time, the left side main clutch and the right side main clutch are arranged in parallel, the left side parallel clutch and the right side parallel clutch are arranged in parallel, the left side diesel engine and the left side propulsion motor run in parallel through the left side gear box, the right side diesel engine and the right side propulsion motor run in parallel through the right side gear box, the ship enters a full-speed working condition to meet the demand for power in an extreme working condition of the ship;

[0012] When the driver reduces the sailing gear, the system judges that the driver has the intention to slow down, the left side parallel clutch and the right side parallel clutch are arranged in parallel, the left side propulsion motor and the right side propulsion motor generate electricity to run, negative torque is provided to slow down the ship, braking energy is converted into electric energy and stored in the left side power battery and the right side power battery, and the ship enters a braking working condition.

[0013] The control method of the marine hybrid power system, when the power of the left side power battery and the right side power battery cannot respectively meet the required power of the left side propelling motor and the right side propelling motor to push the whole ship in the ship cruising working condition, the left side diesel engine is started, the right side diesel engine is not started, the left side main clutch and the right side main clutch are divided, the left side parallel clutch and the right side parallel clutch are combined, the circuit breaker is closed, the left side series motor generates electricity, the left side propelling motor and the right side propelling motor are operated in electricity, the ship is propelled to sail, and the left side power battery and the right side power battery are charged at the same time.

[0014] The technical effect of the present application is that, compared with the prior art, the present application has the beneficial effect that the system realizes effective energy distribution of the diesel-electric hybrid ship power and electric power system, improves the comprehensive efficiency and fuel economy of the ship power system, achieves the purpose of energy saving and emission reduction, and is suitable for the field of new energy marine power systems. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the marine hybrid power system of the present application;

[0016] Figure 2 is a flow schematic diagram of the control method of the marine hybrid power system of the present application.

[0017] Explanation of markings in the diagram: 100—Port propeller, 101—Port gearbox, 102—Port main clutch, 103—Port series motor, 104—Port diesel engine, 105—Port parallel clutch, 106—Port propulsion motor, 107—Port converter one, 108—Port fuse one, 109—Port fuse two, 110—Port power battery, 111—Port converter two, 112—Port fuse three, 113—Port fuse four, 114—Port converter three, 115—Port circuit breaker, 116—Circuit breaker one, 1 17—Circuit breaker II, 118—Circuit breaker III, 200—Starboard propeller, 201—Starboard gearbox, 202—Starboard main clutch, 203—Starboard series motor, 204—Starboard diesel engine, 205—Starboard parallel clutch, 206—Starboard propulsion motor, 207—Starboard converter I, 208—Starboard fuse I, 209—Starboard fuse II, 210—Starboard power battery, 211—Starboard converter II, 212—Starboard fuse III, 213—Starboard fuse IV, 214—Starboard converter III, 215—Starboard circuit breaker. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] like Figure 1 As shown, the topology of a marine hybrid power system of the present invention comprises a diesel engine, a lithium-ion power battery, a series motor, a propulsion motor, a converter, a circuit breaker, a fuse, a main clutch, a parallel clutch, a gearbox, and a propeller.

[0020] The aforementioned port-side diesel-electric hybrid power system topology includes a port-side gearbox 101 connected to the port-side propeller 100, and a port-side main clutch 102 and a port-side parallel clutch 105 respectively connected to the port-side gearbox 101. A port-side series motor 103, used as a port-side generator, is connected to the port-side main clutch 102. A port-side diesel engine 104, used as the port-side main propulsion device, and a port-side converter 107 are respectively connected to the port-side converter 103. A lithium-ion port-side power battery 110, used for ship power or domestic power, is connected to the port-side parallel clutch 105. A port-side propulsion motor 106 is connected to the port-side propulsion motor 106, used for port-side navigation. A port-side converter 2 111 and a port-side converter 3 114 are connected in sequence to the port-side propulsion motor 106.

[0021] The aforementioned starboard diesel-electric hybrid power system topology includes a starboard gearbox 201 connected to the starboard propeller 200, and a starboard main clutch 202 and a starboard parallel clutch 205 connected to the starboard gearbox 201. The starboard main clutch 202 is connected to a starboard series motor 203 used as a starboard generator. The starboard series motor 203 is connected to a starboard diesel engine 204 used as the starboard main propulsion device and a starboard converter 1 207. The starboard converter 1 207 is connected to a lithium-ion starboard power battery 210 used for ship power or domestic power. The starboard parallel clutch 205 is connected to a starboard propulsion motor 206. The starboard propulsion motor 206 used for ship starboard navigation is connected to a starboard converter 211 and a starboard converter 3 214 in sequence.

[0022] The port-side converter 107 and the port-side power battery 110 are respectively connected to the port-side DC bus via port-side fuse 108 and port-side fuse 2 109. The port-side converter 2 111 and the port-side converter 3 114 are respectively connected to the port-side DC bus via port-side fuse 3 112 and port-side fuse 4 113.

[0023] The port-side converter 3 114 is connected to the port-side AC bus via the port-side circuit breaker 115, and the starboard-side converter 1 207 and the starboard-side power battery 210 are connected to the starboard-side DC bus via the starboard-side fuse 1 208 and the starboard-side fuse 209, respectively.

[0024] The starboard converter 211 and starboard converter 314 are connected to the starboard DC bus via starboard fuse 312 and starboard fuse 413, respectively. The starboard converter 314 is connected to the starboard AC bus via starboard circuit breaker 215.

[0025] The port DC bus is connected to the starboard DC bus via circuit breaker 2 117, the port AC bus is connected to the starboard AC bus via circuit breaker 3 118, and the AC bus is connected to shore power via circuit breaker 1 116.

[0026] like Figure 2 The diagram shows a flow chart of the marine hybrid power system control method of the present invention. Based on the ship's navigation status and the power battery charge, the control method of the present invention realizes the operation and switching of the ship's anchoring watch condition, quiet condition, cruising condition, high-speed navigation condition, full-speed condition, and braking condition. It realizes the effective distribution of energy between the diesel-electric hybrid ship's power and electric system, and improves the overall efficiency and fuel economy of the ship's power system.

[0027] (1) Ship anchoring value duty condition: when the left side power battery 110 and the right side power battery 210 are lower than the set value, the ship has no navigation demand, the system starts the charging mode, the left side diesel engine 104 and the right side diesel engine 204 are stopped, all the clutches are divided, the left side breaker 115, the breaker one 116, the breaker three 118 and the right side breaker 215 are closed, the breaker two 117 is disconnected, and the shore power is used to charge the left side power battery 110 and the right side power battery 210 respectively. At this time, the power battery is lower than the set value, the ship has no navigation demand, the system starts the shore power charging mode, and the battery power is supplemented.

[0028] (2) Silent condition: when the left side power battery 110 and the right side power battery 210 are higher than the set value, the power required to drive the whole ship by the left side propulsion motor 106 and the right side propulsion motor 206 can be met respectively, the diesel engine is not started, the power output of the power battery is pure electric propulsion, the left side main clutch 102 and the right side main clutch 202 are divided, the left side parallel clutch 105 and the right side parallel clutch 205 are combined, and the left side propulsion motor 106 and the right side propulsion motor 206 run to propel the ship sailing. At this time, the power battery is higher than the set value, the power output of the power battery is pure electric propulsion, the propulsion motor is electrically operated, and the ship is propelled to sail.

[0029] (3) Cruise condition: when the left side power battery 110 and the right side power battery 210 cannot meet the power required to drive the whole ship by the left side propulsion motor 106 and the right side propulsion motor 206 respectively, the left side diesel engine 104 is started, the right side diesel engine 204 is not started, the left side main clutch 102 and the right side main clutch 202 are divided, the left side parallel clutch 105 and the right side parallel clutch 205 are combined, the breaker two 117 is closed, the left side series motor 103 is operated to generate electricity, the left side propulsion motor 106 and the right side propulsion motor 206 are operated to generate electricity, the ship is propelled to sail, and the left side power battery 110 and the right side power battery 210 are charged at the same time. At this time, a single diesel engine is started, its series motor is operated to generate electricity, the propulsion motor is operated to generate electricity, the ship is propelled to sail, and the power battery is charged at the same time.

[0030] Similarly, when the left side power battery 110 and the right side power battery 210 cannot meet the power required to drive the whole ship by the left side propulsion motor 106 and the right side propulsion motor 206 respectively, the right side diesel engine 204 is started, the left side diesel engine 104 is not started, the left side main clutch 102 and the right side main clutch 202 are divided, the left side parallel clutch 105 and the right side parallel clutch 205 are combined, the breaker two 117 is closed, the right side series motor 203 is operated to generate electricity, the left side propulsion motor 106 and the right side propulsion motor 206 are operated to generate electricity, the ship is propelled to sail, and the left side power battery 110 and the right side power battery 210 are charged at the same time.

[0031] (4) High-speed navigation condition: when the ship is in high-speed navigation, the demand for rotation speed and torque is basically in the high-efficiency working area of the diesel engine, the system selects the left diesel engine 104 and the right diesel engine 204 to directly propel the ship to navigate, the left main clutch 102 and the right main clutch 202 are combined, the left parallel clutch 105 and the right parallel clutch 205 are separated, the left propulsion motor 106 and the right propulsion motor 206 are not operated, and at the same time, when the left power battery 110 and the right power battery 210 are insufficient, the series left series motor 103 and the right series motor 203 are started to generate electricity to operate to charge the left power battery 110 or the right power battery 210, and the ship enters the high-speed navigation condition, and the demand for rotation speed and torque is basically in the high-efficiency working area of the diesel engine. At this time, the diesel engine directly propels the ship to navigate, and the series motor generates electricity to operate to charge the power battery.

[0032] (5) Full-speed condition: the left power battery 110 and the right power battery 210 are sufficient in power, in order to improve the maneuverability of the ship, the system selects the propulsion motor and the diesel engine to operate at the same time, the left main clutch 102 and the right main clutch 202 are combined, the left parallel clutch 105 and the right parallel clutch 205 are combined, the left diesel engine 104 and the left propulsion motor 106 operate in parallel through the left gear box 101, the right diesel engine 204 and the right propulsion motor 206 operate in parallel through the right gear box 201, and the ship enters the full-speed condition to cope with the demand for power in extreme conditions of the ship. At this time, the propulsion motor and the diesel engine operate in parallel to jointly propel the ship to navigate.

[0033] (6) Braking condition: when the driver reduces the navigation gear, the system judges that the driver has the intention to slow down, the left parallel clutch 105 and the right parallel clutch 205 are combined, the left propulsion motor 106 and the right propulsion motor 206 generate electricity to operate to provide negative torque to slow down the ship, convert the braking energy into electrical energy and store it in the left power battery 110 and the right power battery 210, and the ship enters the braking condition. At this time, the propulsion motor generates electricity to operate to convert the braking energy into electrical energy and store it in the power battery.

[0034] The present application is not limited to the above-mentioned best embodiment, and any person skilled in the art can derive other modified and improved products under the inspiration of the present application, but regardless of any change in form, any technical solution with the same or similar technical solution as the present application falls within the protection scope of the present application.

Claims

1. A control method for a marine hybrid power system, characterized in that, The power system consists of a port-side diesel-electric hybrid power system topology and a starboard-side diesel-electric hybrid power system topology; the port-side diesel-electric hybrid power system topology includes a port-side gearbox (101) connected to the port-side propeller (100) and a port-side main clutch (102) and a port-side parallel clutch (105) respectively connected to the port-side gearbox (101). A port-side series motor (103) used as a port-side generator is connected to the port-side main clutch (102). A port-side diesel engine (104) and a port-side converter (107) are respectively connected to the port-side main propulsion equipment. A lithium-ion port-side power battery used for ship power or domestic power is connected to the port-side converter (107). 110), the port side parallel clutch (105) is connected to the port side propulsion motor (106), and the port side propulsion motor (106), which is used for port side navigation, is connected in sequence to the port side converter two (111) and the port side converter three (114); the topology of the starboard diesel-electric hybrid power system includes a starboard gearbox (201) connected to the starboard propeller (200) and a starboard main clutch (202) and a starboard parallel clutch (205) respectively connected to the starboard gearbox (201). The starboard main clutch (202) is connected to a starboard series motor (203) used as a starboard generator motor. The starboard series motor (203) is connected to the starboard diesel engine (204) and the starboard main propulsion equipment respectively. Converter 1 (207) is connected to a lithium-ion starboard power battery (210) for ship power or domestic use. A starboard parallel clutch (205) is connected to a starboard propulsion motor (206). The starboard propulsion motor (206), used for ship starboard navigation, is connected in sequence to starboard converter 2 (211) and starboard converter 3 (214). The port converter 1 (107) and the port power battery (110) are connected to the port DC bus via a port fuse. The port converter 2 (111) and the port converter 3 (114) are connected to the port DC bus via a port fuse. The port converter 3 (114) is connected to the port circuit breaker (115). The port side AC bus is connected to the starboard DC bus via starboard fuse 1 (207) and starboard power battery (210). The starboard DC bus is connected to the starboard DC bus via starboard fuse 1 (208) and starboard fuse 2 (209). The starboard DC bus is connected to the starboard DC bus via starboard fuse 3 (212) and starboard fuse 4 (213). The starboard AC bus is connected to the starboard AC bus via starboard circuit breaker (215). The port side DC bus is connected to the starboard DC bus via circuit breaker 2 (117). The port side AC bus is connected to the starboard AC bus via circuit breaker 3 (118). The AC bus is connected to shore power via circuit breaker 1 (116). Depending on the ship's navigation status and the power battery charge, complete the following steps using one of the following methods: When the power of the port power battery (110) and the starboard power battery (210) is lower than the set value, the ship has no need to sail. The system starts the charging mode, the port diesel engine (104) and the starboard diesel engine (204) stop, all clutches are disengaged, the port circuit breaker (115), circuit breaker one (116), circuit breaker three (118) and the starboard circuit breaker (215) are closed, and circuit breaker two (117) is disconnected. The port power battery (110) and the starboard power battery (210) are charged by shore power respectively to replenish the battery power and enter the ship's anchoring watch operation. When the power of the port side power battery (110) and the starboard side power battery (210) is higher than the set value, they respectively meet the power required for the port side propulsion motor (106) and the starboard side propulsion motor (206) to drive the whole ship. The power output of the power battery adopts pure electric propulsion. The port side main clutch (102) and the starboard side main clutch (202) are arranged separately, and the port side parallel clutch (105) and the starboard side parallel clutch (205) are arranged together. The port side propulsion motor (106) and the starboard side propulsion motor (206) operate to propel the ship to sail and enter the ship's quiet working condition. When the port diesel engine (104) or starboard diesel engine (204) is started, the port series motor (103) or starboard series motor (203) generates electricity and the port propulsion motor (106) or starboard propulsion motor (206) operates electrically to propel the ship and charge the port power battery (110) and starboard power battery (210) at the same time, the ship enters the cruise mode. The port diesel engine (104) and the starboard diesel engine (204) directly propel the ship. The port main clutch (102) and the starboard main clutch (202) are connected together, while the port parallel clutch (105) and the starboard parallel clutch (205) are connected separately. The port propulsion motor (106) and the starboard propulsion motor (206) are not running. When the port power battery (110) and the starboard power battery (210) are low in power, the port series motor (103) and the starboard series motor (203) are started to generate electricity to charge the port power battery (110) or the starboard power battery (210) and enter the high-speed navigation mode of the ship. When the ship is sailing against the current and accelerating rapidly, the port power battery (110) and the starboard power battery (210) are fully charged. In order to improve the ship's maneuverability, the system selects the propulsion motor and diesel engine to run simultaneously. The port main clutch (102) and the starboard main clutch (202) are connected, the port parallel clutch (105) and the starboard parallel clutch (205) are connected, the port diesel engine (104) and the port propulsion motor (106) run in parallel through the port gearbox (101), and the starboard diesel engine (204) and the starboard propulsion motor (206) run in parallel through the starboard gearbox (201), entering the ship's full-speed operating condition to meet the power demand of the ship under extreme operating conditions. When the driver lowers the sailing gear, the system determines that the driver intends to decelerate. The port parallel clutch (105) and the starboard parallel clutch (205) engage, and the port propulsion motor (106) and the starboard propulsion motor (206) generate electricity to provide negative torque for the ship to decelerate. The braking energy is converted into electrical energy and stored in the port power battery (110) and the starboard power battery (210), and the ship enters the braking condition. When the port side power battery (110) and starboard side power battery (210) are unable to provide sufficient power for the port side propulsion motor (106) and starboard side propulsion motor (206) to drive the entire ship during the ship's cruising operation, the port side diesel engine (104) starts while the starboard side diesel engine (204) does not. The port side main clutch (102) and starboard side main clutch (202) are decoupled, while the port side parallel clutch (105) and starboard side parallel clutch (205) are engaged. Circuit breaker two (117) closes, the port side series motor (103) generates electricity, and the port side propulsion motor (106) and starboard side propulsion motor (206) operate electrically to propel the ship while simultaneously charging the port side power battery (110) and starboard side power battery (210). Similarly, when the power of the port side power battery (110) and the starboard side power battery (210) is insufficient to meet the power required by the port side propulsion motor (106) and the starboard side propulsion motor (206) to drive the entire ship, the starboard side diesel engine (204) starts, the port side diesel engine (104) does not start, the port side main clutch (102) and the starboard side main clutch (202) are separated, the port side parallel clutch (105) and the starboard side parallel clutch (205) are connected, the second circuit breaker (117) is closed, the starboard side series motor (203) generates electricity and runs, the port side propulsion motor (106) and the starboard side propulsion motor (206) run electrically to propel the ship and charge the port side power battery (110) and the starboard side power battery (210) at the same time.

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