Energy control method for a hybrid yacht electric propulsion system

Abstract

The application provides an energy control method of a hybrid yacht electric propulsion system, comprising a propulsion motor rotating speed management system, a battery temperature adjusting system and a battery pack water cooling plate device; through the method, the total energy stored in the power battery pack can be calculated, so that the power system can meet the ship navigation demand and optimize the system operation performance, and the overall economy of the hybrid yacht is improved; two power battery packs are arranged, one of which is used for storing the electric energy converted by the solar energy equipment or the wind power generation equipment on the yacht, and the PSO algorithm is used for monitoring the propulsion motor rotating speed in real time; under the continuously changing environmental temperature, the battery pack water cooling plate device provides the appropriate battery temperature for the battery pack, optimizes the energy consumption of the battery, and makes the hybrid yacht electric propulsion system have a longer service life.

Description

TECHNICAL FIELD

[0001] The present application relates to battery cooling management and energy control systems, in particular to an energy control method for a hybrid yacht electric propulsion system. TECHNICAL BACKGROUND

[0002] Under the background of energy saving and emission reduction in the world, hybrid electric propulsion ships have become a development trend, which is a transition from traditional energy ship propulsion to pure electric ship propulsion. It has two sets of energy supply devices, lithium batteries and diesel generators. Lithium batteries play an important role in hybrid electric propulsion ships. Research shows that the lithium battery content ratio and coulomb efficiency are closely related to temperature. If the temperature is lower or higher than the optimal use temperature, the battery efficiency will be greatly reduced, and even the battery will be damaged.

[0003] Patent CN103723263A discloses a hybrid electric propulsion ship lithium battery temperature control system, which uses water resources during ship navigation to cool and reduce the temperature of lithium battery pack, and combines the exhaust gas during diesel engine operation to heat the water in the heat storage water tank, and then heat and raise the temperature of the lithium battery pack. The system reasonably utilizes the waste heat of the diesel engine, but the temperature control is not accurate enough during the heating and cooling process of the lithium battery pack, the system structure is complex, and it is not easy to realize. Only has a certain environmental protection effect. Patent CN108032983A discloses a hybrid power ship charging and discharging control device, which is composed of a diesel generator set, a controllable rectifier device, a battery pack, a propulsion frequency converter and a propulsion motor. The control method is also disclosed. The charging and discharging control strategy adopted can realize deep hybrid power supply of the diesel generator set and the battery pack, and can realize charging and discharging control of the battery pack during ship operation without additional charger, but still needs to consume the power of the diesel generator set to control the charging and discharging of the battery pack during ship operation.

[0004] At present, the energy control method of the hybrid yacht electric propulsion system still has the following problems: 1. But in some cases, the distribution and optimization of energy may not be accurate enough. For the mixed use of multiple energy sources such as fuel engines, solar energy and batteries, more advanced algorithms and control strategies are needed to ensure efficient use and optimal performance of energy sources; 2. The heat dissipation efficiency of the battery pack cooling system is low, and the heat generated in the battery pack cannot be effectively dissipated, the battery temperature will rise, which will lead to performance decline, shortening of service life and even safety hazards. In summary, in order to better meet the needs of social development, it is urgent to develop more advanced energy control technology for hybrid yacht electric propulsion systems to achieve better social and economic benefits, so the present application provides an energy control method for a hybrid yacht electric propulsion system. SUMMARY

[0005] In order to overcome the problems existing in the prior art, the application provides an energy control method of a hybrid yacht electric propulsion system, which comprises a propulsion motor speed management system, a battery temperature adjusting system and a battery pack water cooling plate device; the propulsion motor speed management system is used for monitoring the speed information of the propulsion motor in real time; the battery temperature adjusting system provides appropriate battery temperature for the battery pack through the battery pack water cooling plate device under the changing battery pack temperature.

[0006] The hybrid yacht electric propulsion system is provided with two power battery packs, one of which is used for storing the electric energy converted by the solar energy equipment or the wind power generation equipment on the yacht.

[0007] The energy control method of the electric propulsion system monitors the speed of the propulsion motor in real time through the PSO algorithm, and the battery pack water cooling plate device provides appropriate battery temperature for the battery pack under the changing environmental temperature. For the energy management strategy, the battery charge is selected as the state variable and is represented as S; the power of the power battery is selected as the control variable and is represented as P. The sum of the consumption of the two power battery packs of the hybrid yacht electric propulsion system is selected as the optimization objective function J; at the same time, in order to control the power battery S in the normal range, the adjusting coefficient α is introduced into the optimization objective function, as shown in the following formula:

[0008]

[0009] In the formula, J is the minimum energy consumption of the sum of the consumption of the battery pack, m(t) is the instantaneous electric energy consumption rate of the battery, S max is the minimum state of charge of the battery, mim is the maximum state of charge of the battery, and α is the adjusting coefficient.

[0010] At the same time, in order to protect the battery pack of the hybrid yacht electric propulsion system, the power limit and performance requirements of each battery pack are considered, and the following formula constraint condition needs to be met:

[0011]

[0012] p b,min is the minimum power of the power battery, b,max is the maximum power of the power battery, a,min is the minimum power of the auxiliary battery, and a,max is the maximum power of the auxiliary battery.

[0013] The PSO algorithm is adopted to solve the above objective function, so as to obtain the optimal battery pack power and realize the optimal distribution of the power of the power system.

[0014] The battery pack water cooling plate device comprises a water cooling plate, a battery box cooling liquid guide main pipe, a cooling liquid condenser, an open hole heat dissipation plate and a battery pack; the water cooling plate comprises a water cooling plate shell, a water cooling plate cooling liquid branch pipe water outlet, a water cooling plate liquid guide branch pipe, a water cooling plate cooling liquid inlet, a water cooling plate cooling liquid main water outlet and a right-angled triangle partition plate; the inner cavity of the water cooling plate is provided with a plurality of right-angled triangle partition plates which are oppositely arranged and alternately arranged; the higher end of the right-angled triangle partition plate is provided with the water cooling plate cooling liquid branch pipe water outlet; the water cooling plate cooling liquid branch pipe water outlets on both sides are collected through the water cooling plate liquid guide branch pipe and finally flow through the water cooling plate cooling liquid main water outlet.

[0015] The battery box cooling liquid guide main pipe comprises a condenser water inlet, a condenser water outlet, a battery box cooling liquid inlet pipe and a battery box cooling liquid outlet pipe; the water cooling plate cooling liquid main water outlet is connected with the battery box cooling liquid outlet pipe; the battery box cooling liquid outlet pipe is connected with the condenser water inlet; the condenser water outlet is connected with the battery box cooling liquid inlet pipe; the battery box cooling liquid inlet pipe is connected with the water cooling plate through the water cooling plate cooling liquid inlet.

[0016] The open hole heat dissipation plate is regularly provided with oval holes for supporting the battery pack and assisting heat dissipation; the material of the open hole heat dissipation plate is aluminum alloy, which can effectively conduct the heat of the battery pack to the heat dissipation system and accelerate the heat dissipation; the use of the material makes the open hole heat dissipation plate have high strength and corrosion resistance, and is suitable for the application environment of the battery pack.

[0017] An energy control method of a hybrid yacht electric propulsion system comprises the following steps:

[0018] In step a, the motor speed management system is used to monitor the speed information of the propulsion motor in real time, including the historical speed, the real-time speed and the real-time acceleration of the propulsion motor;

[0019] In step b, the energy output of the hybrid yacht electric propulsion system is optimized by the PSO algorithm according to the speed information of the propulsion motor recorded by the motor speed management system;

[0020] In step c, the battery pack water cooling plate device is used to make the cooling liquid enter the cooling cavity at a lower position according to the changing temperature of the battery pack; the cooling liquid with a higher temperature is discharged from the higher water cooling plate cooling liquid branch pipe water outlet 102 position through the blocking effect of the right-angled triangle partition plate 106; the right-angled triangle partition plate 106 can also increase the contact area and improve the heat exchange efficiency; the staggered right-angled triangle partition plates 106 form a space with a smooth front and back in the middle position, which is more conducive to the cooling liquid entering the deep part of the whole water cooling plate and quickly adjusting the temperature of the battery pack.

[0021] Compared with the prior art, the present application has the advantages and positive effects that:

[0022] (1) The energy control method of the hybrid power yacht electric propulsion system adopting the PSO algorithm can optimize the power distribution of the power battery and the auxiliary battery, and compared with the energy management strategy based on speed optimization, the economy of battery energy consumption is obviously improved;

[0023] (2) The cooling liquid in the water cooling plate enters the cooling cavity at a lower position, and is discharged from a higher position through the blocking effect of the right-angled triangular partition plate, and the right-angled triangular partition plate can also increase the contact area and improve the heat exchange efficiency;

[0024] (3) The staggered triangular partition plates in the water cooling plate form a front and rear relative unobstructed space at the middle position, which is more conducive to the cooling liquid entering the deep part of the whole water cooling plate. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A structure diagram of a hybrid power yacht electric propulsion system is provided for the present application;

[0026] Figure 2 An energy control method of a hybrid power yacht electric propulsion system is provided for the present application;

[0027] Figure 3 A battery box overall structure schematic diagram is provided for the present application;

[0028] Figure 4 A battery box top view is provided for the present application;

[0029] Figure 5 A battery box partial structure schematic diagram is provided for the present application;

[0030] Figure 6 A water cooling plate top view is provided for the present application;

[0031] Figure 7 A water cooling plate structure schematic diagram is provided for the present application;

[0032] Figure 8 A water cooling plate internal structure schematic diagram is provided for the present application;

[0033] Figure 9 A water cooling plate internal cooling liquid flow schematic diagram is provided for the present application;

[0034] MARKED FOR THE DRAWINGS:

[0035] 1 - water cooling plate 101 - water cooling plate shell 102 - water cooling plate cooling liquid branch pipe water outlet 103 - water cooling plate liquid guide branch pipe 104 - water cooling plate cooling liquid inlet 105 - water cooling plate cooling liquid total water outlet 106 - right-angled triangle partition plate 2 - battery box cooling liquid guide total pipe 201 - condenser water inlet 202 - condenser water outlet 203 - battery box cooling liquid inlet pipe 204 - battery box cooling liquid outlet pipe 3 - cooling liquid condenser 4 - open hole heat dissipation plate 5 - battery pack. DETAILED DESCRIPTION

[0036] In order to further illustrate the technical means adopted by the present application to achieve the above-mentioned purposes of the application, the contents of the specification can be implemented, and in order to make the above-mentioned and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are as follows.

[0037] The present application provides an energy control method of a hybrid yacht electric propulsion system, characterized in that: comprising a propulsion motor speed management system, a battery temperature regulation system and a battery pack water cooling plate device; the motor speed management system is used to monitor the speed information of the propulsion motor in real time; the battery temperature regulation system provides suitable battery temperature for the battery pack through the battery pack water cooling plate device under the constantly changing battery pack temperature.

[0038] As shown in Figure 1 The hybrid yacht electric propulsion system is provided with two power battery packs, one of which is used to store the electric energy converted by the solar energy equipment or the wind power generation equipment on the yacht.

[0039] As shown in Figure 2 The energy control method of the electric propulsion system monitors the speed of the propulsion motor in real time through the PSO algorithm, and the battery pack water cooling plate device provides suitable battery temperature for the battery pack under the constantly changing environmental temperature. For this energy management strategy, the battery charge is selected as the state variable, denoted as S; the power battery power is selected as the control variable, denoted as P. The sum of the consumption of the two power battery packs of the hybrid yacht electric propulsion system is selected as the optimization objective function J; at the same time, in order to control the power battery S within the normal range, the adjustment coefficient α is introduced into the optimization objective function, as shown in the following formula:

[0040]

[0041] In the formula, J - the minimum energy consumption of the total consumption of the battery pack, m(t) - the instantaneous electric energy consumption rate of the battery, S max - the minimum state of charge of the battery, min - the maximum state of charge of the battery, α - the adjustment coefficient;

[0042] At the same time, in order to protect the battery pack of the hybrid yacht electric propulsion system, considering the power limit and performance requirements of each battery pack, the following constraints need to be met:

[0043]

[0044] P b,min - the minimum power of the power battery, P b,max - the maximum power of the power battery, P a,min - the minimum power of the auxiliary battery, P a,max - the maximum power of the auxiliary battery;

[0045] The PSO algorithm is used to solve the above objective function to obtain the optimal battery pack power and realize the optimal allocation of the power system energy.

[0046] As shown in Figure 3 and Figure 4 , the battery pack water cooling plate device comprises a water cooling plate 1, a battery box cooling liquid guide main pipe 2, a cooling liquid condenser 3, an open hole heat dissipation plate 4 and a battery pack 5; the water cooling plate 1 comprises a water cooling plate shell 101, a water cooling plate cooling liquid branch pipe water outlet 102, a water cooling plate liquid guide branch pipe 103, a water cooling plate cooling liquid inlet 104, a water cooling plate cooling liquid total water outlet 105 and a right-angled triangle partition plate 106.

[0047] As shown in Figure 6 , Figure 7 and Figure 8 , the inner cavity of the water cooling plate 1 is provided with a plurality of right-angled triangle partition plates 106 which are oppositely arranged and alternately arranged, a water cooling plate cooling liquid branch pipe water outlet 102 is arranged at the higher end of the right-angled triangle partition plate 106, a plurality of water cooling plate cooling liquid branch pipe water outlets 102 on both sides are collected through the water cooling plate liquid guide branch pipe 103, and finally flow through the water cooling plate cooling liquid total water outlet 105.

[0048] As shown in Figure 5 , the battery box cooling liquid guide main pipe 2 comprises a condenser water inlet 201, a condenser water outlet 202, a battery box cooling liquid inlet pipe 203 and a battery box cooling liquid outlet pipe 204; the water cooling plate cooling liquid flows out from the water cooling plate cooling liquid total water outlet 105, is collected in the battery box cooling liquid outlet pipe 204, flows into the cooling liquid condenser 3 through the condenser water inlet 201 for cooling, the cooled cooling liquid flows into the battery box cooling liquid inlet pipe 203 through the condenser water outlet 202, and finally flows into the water cooling plate 1.

[0049] As shown in Figure 4As shown, the perforated heat dissipation plate 4 has regularly distributed elliptical shapes to support the battery pack and assist in heat dissipation. The material of the perforated heat dissipation plate 4 is aluminum alloy, which can effectively conduct the heat of the battery pack to the heat dissipation system and accelerate the dissipation of heat. The use of this material gives the perforated heat dissipation plate high strength and corrosion resistance, making it suitable for the application environment of the battery pack 5.

[0050] The energy control method for a hybrid yacht electric propulsion system described in this invention consists of three steps:

[0051] First step, such as Figure 2 As shown, the motor speed management system is used to monitor the speed information of the propulsion motor in real time, including the historical speed, real-time speed and real-time acceleration of the propulsion motor.

[0052] The second step is to optimize the energy output of the hybrid yacht's electric propulsion system based on the propulsion motor speed information recorded by the electric motor speed management system and the PSO algorithm.

[0053] The third step, as Figure 9 As shown, the battery pack water-cooling plate device allows coolant to enter the cooling chamber at a lower position based on the constantly changing battery pack temperature. The right-angled triangular baffles 106 act as a barrier, causing the heated coolant to exit from the higher position of the coolant branch pipe outlet 102. Simultaneously, the right-angled triangular baffles 106 increase the contact area and improve heat exchange efficiency. Furthermore, the staggered right-angled triangular baffles 106 create a relatively unobstructed space in the middle, further facilitating the coolant's penetration into the depths of the entire water-cooling plate 1 and rapidly regulating the battery pack temperature.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A hybrid yacht electric propulsion system, comprising a propulsion motor speed management system, a battery temperature regulation system, and a battery pack water cooling plate device, characterized in that: the hybrid yacht drives the propeller to rotate by the propulsion motor to provide driving force for the yacht, a diesel engine, a power battery pack, and an auxiliary battery pack are arranged on the hybrid yacht, the diesel engine is electrically connected with the power battery pack through an AC / DC converter and a DC / DC converter, the diesel engine always operates in a speed range of optimal combustion efficiency, and the auxiliary battery pack stores electric energy generated by wind power / solar power; the motor speed management system monitors a speed signal of the propulsion motor in real time through a power system controller, the battery temperature regulation system controls charging and discharging temperatures of the power battery pack and the auxiliary battery pack, and the battery pack water cooling plate (1) device is used to control the temperature of the battery pack; the water cooling plate (1) and the battery pack are alternately arranged, a plurality of groups of triangular partitions are arranged in the water cooling plate (1) to accelerate circulation and heat exchange of the cooling liquid; the hybrid yacht electric propulsion system is provided with the power battery pack and the auxiliary battery pack, the auxiliary battery pack is used to store electric energy converted by solar power equipment or wind power generation equipment on the yacht, and the power battery pack is used to store electric energy generated by the diesel engine; the battery pack water cooling plate device comprises a water cooling plate (1), a battery box cooling liquid guide main pipe (2), a cooling liquid condenser (3), an open hole heat dissipation plate (4), and a battery pack (5); the water cooling plate (1) comprises a water cooling plate shell (101), a water cooling plate cooling liquid branch pipe water outlet (102), a water cooling plate liquid guide branch pipe (103), a water cooling plate cooling liquid inlet (104), a water cooling plate cooling liquid main outlet (105), and a right-angled triangular partition (106); a plurality of right-angled triangular partitions (106) with opposite directions and arranged alternately are arranged in the inner cavity of the water cooling plate (1), the water cooling plate cooling liquid branch pipe water outlet (102) is arranged at a higher end of the right-angled triangular partition (106), a plurality of water cooling plate cooling liquid branch pipe water outlets (102) on both sides are collected through the water cooling plate liquid guide branch pipe (103), and finally flow through the water cooling plate cooling liquid main outlet (105).

2. The hybrid yacht electric propulsion system according to claim 1, characterized in that: the right-angled triangular partitions (106) are arranged in opposite directions alternately, so that a middle part of the right-angled triangular partitions (106) forms a flow channel allowing the cooling liquid to pass through with small resistance; the water cooling plate cooling liquid inlet (104) and the water cooling plate cooling liquid main outlet (105) are oppositely arranged and correspondingly arranged on the flow channel; the water cooling plate cooling liquid branch pipe water outlet (102) is arranged at the higher end of the right-angled triangular partition (106), so that the cooling liquid with a higher temperature is lifted by the inclined surface of the right-angled triangular partition (106) to accelerate the circulation of the cooling liquid.

3. The hybrid yacht electric propulsion system according to claim 2, characterized in that: The battery box cooling liquid guide main pipe (2) comprises a condenser water inlet (201), a condenser water outlet (202), a battery box cooling liquid water inlet pipe (203), and a battery box cooling liquid water outlet pipe (204); the water-cooled plate cooling liquid total water outlet (105) is connected with the battery box cooling liquid water outlet pipe (204), the battery box cooling liquid water outlet pipe (204) is communicated with the condenser water inlet (201), the condenser water outlet (202) is communicated with the battery box cooling liquid water inlet pipe (203), and the battery box cooling liquid water inlet pipe (203) is connected with the water-cooled plate (1) through the water-cooled plate cooling liquid water inlet (104).

4. The hybrid yacht electric propulsion system of claim 3, wherein: The open hole heat sink (4) has regular distribution of oval shape to support the battery pack and auxiliary heat dissipation; the material of the open hole heat sink (4) is aluminum alloy, which can effectively conduct the heat of the battery pack to the heat dissipation system and accelerate the heat dissipation; the use of the material makes the open hole heat sink have high strength and corrosion resistance, which is suitable for the application environment of the battery pack (5).

5. A method of energy control for a hybrid yacht electric propulsion system according to any one of claims 1-4, characterized in that The method comprises the following steps: Step a, the motor speed management system is used to monitor the speed information of the propulsion motor in real time, including the historical speed, real-time speed and real-time acceleration of the propulsion motor; Step b, according to the speed information of the propulsion motor recorded by the motor speed management system, the energy output of the hybrid yacht electric propulsion system is optimized through the PSO algorithm; Step c, the battery pack water-cooled plate device enters the cooling liquid into the cooling cavity at a lower position according to the changing temperature of the battery pack, and the cooling liquid with a higher temperature is discharged from the higher water-cooled plate cooling liquid branch water outlet (102) position through the blocking effect of the right-angled triangular partition plate (106); meanwhile, the right-angled triangular partition plate (106) can also increase the contact area and improve the heat exchange efficiency; and the staggered right-angled triangular partition plates (106) form a relatively unobstructed space in the middle position, which is more conducive to the entry of the cooling liquid into the deep part of the entire water-cooled plate (1) and the rapid adjustment of the battery pack temperature.

6. The energy control method of claim 5, wherein: The energy control method of the electric propulsion system monitors the speed of the propulsion motor in real time through the PSO algorithm, and the battery pack water-cooled plate device provides a suitable battery temperature for the battery pack under the condition of changing environmental temperature; for the energy management strategy, the battery charge is selected as the state variable, denoted as S; the power battery power is selected as the control variable, denoted as P; the total consumption of the two power battery packs of the hybrid yacht electric propulsion system is selected as the optimization objective function J; at the same time, in order to control the power battery S within the normal range, an adjustment coefficient a is introduced into the optimization objective function, as shown in the following formula: where J - the minimum energy consumption of the total battery consumption, m(t) - the instantaneous battery power consumption rate, S max - the minimum state of charge of the battery, min - the maximum state of charge of the battery, a - the adjustment coefficient.

7. The energy control method of claim 6, wherein: wherein, In order to protect the battery packs of the hybrid yacht electric propulsion system, the power limit and performance requirements of each battery pack are considered, and the following constraint condition needs to be met: P b,min - minimum power of the power battery, P b,max - maximum power of the power battery, P a,min - minimum power of the auxiliary battery, P a,max - maximum power of the auxiliary battery; The PSO algorithm is used to solve the above objective function, and the optimal battery power is obtained, so as to realize the optimal distribution of the power system energy.

8. The energy control method of claim 7, wherein: When the propulsion motor demand power is too large and the diesel generator power generation capacity cannot meet the demand, the temperature of the power battery pack is detected, and when the temperature of the power battery pack is too high, the auxiliary battery pack is used to supplement the propulsion motor with energy.

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