Energy management system

Abstract

To provide an energy management system capable of realizing the constant amount maintenance of propulsion force, the improvement of energy efficiency, and the suppression of the fluctuation of an electric power system and of a motor output in an electric propulsion ship equipped with battery means.SOLUTION: An energy management system according to an embodiment comprises battery means, a charge / discharge power converter capable of converting the output of the battery means to an electric power bidirectionally, a power converter for rotary machine driving to drive a rotary machine for a ship propulsion using an AC output of the charge / discharge power converter as a power source, and a controller to output a restriction signal to the power converter for rotary machine driving using ship positional information obtained from a positioning system, ship velocity information, and charge information of the battery means as input.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to energy management in an electric propulsion system that includes a power storage means such as a secondary battery. [Background technology]

[0002] Conventionally, technologies such as those shown in Patent Document 1 have been proposed for operational support such as calculating power output according to ship speed when operating a battery-propelled ship, setting timetable information according to external disturbances, and calculating and correcting planned ship speed.

[0003] According to the technology disclosed in Patent Document 1, it is possible to improve the energy efficiency of a ship while ensuring safe navigation by providing operational support through the calculation and correction of planned ship speed, changes to timetable information, etc., and calculation of recommended output power according to the navigation section, based on operation information, disturbance information, obstacle detection information, and charging information, in accordance with a pre-set planned ship speed and charging plan information for the ports of departure and arrival. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7011252 Summary of the Invention [Problem to be solved by the invention]

[0005] However, while the technology disclosed in Patent Document 1 can operate the entire system efficiently, including calculating output power corresponding to ship speed, adjusting water traffic schedules, and changing the planned ship speed to coordinate with charging points and other ships, changes in output power and ship speed bring about changes in the propulsion motor and power source, which may lead to vibrations in the engine and equipment and transient changes in the power system, so it cannot be said to be necessarily optimal.

[0006] Therefore, an object of the present invention is to provide an energy management system in an electric propulsion ship equipped with a power storage means, which maintains a constant level of propulsive force, improves energy efficiency, and suppresses fluctuations in power system and motor output. [Means for solving the problem]

[0007] The energy management system of one embodiment includes a storage means, a charge / discharge power converter capable of bidirectional power conversion of the output of the storage means, a rotating machine drive power converter that uses the AC output of the charge / discharge power converter as a power source to drive a rotating machine for propelling the ship, and a controller that receives as inputs the ship's position information and ship speed information obtained from a positioning system and charging information for the storage means, and outputs a limiting signal to the rotating machine drive power converter. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram showing an example of the configuration of an energy management system according to a first embodiment of the present invention. [Figure 2a] FIG. 2a is a diagram showing the relationship between the rotation speed of a rotating machine and the output and torque. [Figure 2b] FIG. 2b is a diagram showing the actual operating characteristics of a rotating machine. [Figure 3a] FIG. 3a is a graph showing the change in output and torque when the limit value is lowered with respect to the driving characteristics of FIG. 2b. [Figure 3b] FIG. 3b is a diagram showing an example of an output when the limit value is further reduced in stages with respect to the output shown in FIG. 3a. [Figure 4] FIG. 4 is a diagram showing how output and torque can be reduced by limiting the rotation speed. [Diagram 5] FIG. 5 is a diagram showing ports where ships depart and arrive, and sea sections. [Figure 6] FIG. 6 is a flow diagram showing an example of an operation of the energy management system according to the first embodiment of the present invention. [Figure 7]FIG. 7 is a block diagram showing an example of the configuration of an energy management system according to the second embodiment of the present invention. [Figure 8] FIG. 8 is a block diagram showing an example of the configuration of an energy management system according to the third embodiment of the present invention. [Figure 9] FIG. 9 is a diagram showing the driving characteristics of the energy management system according to the third embodiment of the present invention when including a prime mover. [Figure 10] FIG. 10 is a block diagram showing an example of the configuration of an energy management system according to the fourth embodiment of the present invention. [Figure 11] FIG. 11 is a block diagram showing an example of the configuration of an energy management system according to the fifth embodiment of the present invention. [Figure 12] FIG. 12 is a block diagram showing an example of the configuration of an energy management system according to the sixth embodiment of the present invention. [Figure 13] FIG. 13 is a conceptual diagram showing a switching controller applied in the seventh embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, each embodiment of the present invention will be described with reference to the drawings. The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the size ratio between parts, etc. are not necessarily the same as the actual ones. Even when the same part is shown, the dimensions and ratios of each part may be different depending on the drawing. In this specification and each drawing, elements similar to those described above with respect to the previous drawings are given the same reference numerals, and detailed explanations and duplicated explanations are omitted as appropriate.

[0010] <First embodiment> (composition) FIG. 1 is a block diagram showing an example of the configuration of an energy management system according to a first embodiment of the present invention.

[0011] In FIG. 1, reference numeral 1 denotes an energy management system, 10 denotes a power storage means, 21 denotes a charge / discharge power converter, 21a denotes a filter, 22 denotes a power converter for driving a rotating machine, 30 denotes a controller, 40 denotes a satellite positioning system, 60 denotes an AC load, 80 denotes a rotating machine, and 90 denotes a propeller.

[0012] The energy management system 1 is applied, for example, to eco-friendly operation of a ship, and by limiting the output of the propulsion motor according to a combination of the ship's position information and ship speed information obtained from a satellite positioning system 40 or the like, and the charging information of the power storage means 10, it enables eco-friendly operation that makes maximum use of the energy stored in the power storage means 10 while preventing a decrease in speed and suppressing load fluctuations in the engine and equipment.

[0013] The power storage means 10 is composed of a secondary battery and includes a calculation unit for calculating charging information. Note that if the calculation unit is replaced by another device and the storage means 10 is connected to this device, the storage means 10 does not need to include the calculation unit.

[0014] The charge / discharge power converter 21 is capable of bidirectional power conversion of the output of the power storage means 10. A filter 21a is provided in the subsequent stage of the charge / discharge power converter 21. The filter 21a suppresses harmonic components contained in the AC output of the charge / discharge power converter 21.

[0015] The satellite positioning system 40 can be, for example, a device capable of measuring the position and speed of a ship, such as a GPS or a current speed measurement using a Doppler log, or a combination thereof.

[0016] The controller 30 receives as input the ship's position information and ship speed information from the satellite positioning system 40 and charging information of the storage means 10, generates a limiting signal for limiting the output of the rotating machine driving power converter 22, and outputs the generated limiting signal to the rotating machine driving power converter 22.

[0017] The rotating machine driving power converter 22 uses the AC output from the charging / discharging power converter 21, supplied via a filter 21a, as a power source, and drives the rotating machine 80 in accordance with a limiting signal from the controller 30. The rotating machine 80 is connected to the shaft of a propeller 90 for propelling the ship.

[0018] The connection between the rotating machine 80 and the propeller 90 is not limited to being coaxial, but may be an interlocking shaft configuration via a transmission. Furthermore, the rotating machine 80 may be either brushless or brushed, regardless of the excitation method, such as a permanent magnet type or a wound field type. Furthermore, it may be either a synchronous machine or an induction machine.

[0019] A generator that generates electricity by being driven by, for example, a diesel engine is connected to the AC load 60 via an AC line. As a result, power is supplied to the AC load 60 by the AC output of the charge / discharge power converter 21. The AC line may also include a transformer for level conversion regardless of the voltage level, such as high voltage or low voltage.

[0020] (operation) Next, an example of the operation of the energy management system according to the first embodiment of the present invention will be described.

[0021] In the energy management system 1, DC power from the power storage means 10 is converted to AC power by the charge / discharge power converter 21, and is supplied to the AC load 60 via a filter 21a.

[0022] The AC output from the charge / discharge power converter 21 is also sent to a rotary machine driving power converter 22 via a filter 21a.

[0023] The controller 30 receives ship position information and ship speed information from the satellite positioning system 40, and charging information from the power storage means 10. Based on this information, the controller 30 generates a limiting signal for limiting the output of the rotary machine driving power converter 22. An output limiting value is specified in the limiting signal.

[0024] In place of the output limit, a torque limit or a speed limit can be applied. In the case of a torque limit, a torque limit value is specified in the limit signal, and in the case of a speed limit, a speed limit value is specified in the limit signal.

[0025] Therefore, the controller 30 switches the limiting signal to be output to the rotary machine driving power converter 22 according to the combination of the ship's position information, ship speed information, and charging information from the power storage means 10. The switched limiting signal is then output from the controller 30 to the rotary machine driving power converter 22. In the rotating machine driving power converter 22, the rotating machine 80 is driven in accordance with a limiting signal from the controller 30, using the AC output from the charging / discharging power converter 21 as a power source. Since the rotating machine 80 is connected to the shaft of a propeller 90 for propelling the ship, the output of the propeller 90 can be limited by limiting the driving of the rotating machine 80.

[0026] FIG. 2a is a diagram showing the relationship between the rotation speed of a rotating machine and the output and torque.

[0027] FIG. 2b is a diagram showing the actual operating characteristics of a rotating machine.

[0028] The propeller 90, which corresponds to the load of the rotating machine 80, is a water load, and is called a reduced torque characteristic, in which the torque is proportional to the square of the rotation speed, and the output is proportional to the cube of the rotation speed. Generally, the rotating machine 80 is designed to have rated output and rated torque at the rated rotation speed, so the actual operating characteristics are as shown in Figure 2b at the base speed N B At rotation speeds above this level, the output is limited by a power converter or the like to prevent excessive output.

[0029] FIG. 3a is a graph showing the change in output and torque when the limit value is lowered with respect to the driving characteristics of FIG. 2b.

[0030] FIG. 3b is a diagram showing an example of an output when the limit value is further reduced in stages with respect to the output shown in FIG. 3a.

[0031] FIG. 4 is a diagram showing how output and torque can be reduced by limiting the rotation speed.

[0032] For example, as shown in Figure 3a, the output P M P L1 If the torque is limited to T M From T L1 and the rotation speed also changes to N B From N L1 From these facts, by utilizing the difference in the reduction amount of the power output and the torque, it is possible to reduce the power output while suppressing the decrease in the propulsive force. In addition, it is also possible to reduce the power output and the torque by limiting the rotation speed as shown in Fig. 4.

[0033] The method of switching the limit value in the controller 30 will be described with reference to FIGS.

[0034] FIG. 5 is a diagram showing ports where ships depart and arrive, and sea sections.

[0035] As shown in FIG. 5, assuming that a ship sails from port A to port B, the route is divided into sections within a preset range, for example, the first half as section K1 and the second half as section K2.

[0036] FIG. 6 is a flow diagram showing an example of an operation of the energy management system according to the first embodiment of the present invention.

[0037] Reference numeral 101 denotes a ship position branching condition, 102 and 122 denote ship speed branching conditions, and 103, 113, 123 and 133 denote branching conditions for the state of charge of the electricity storage means 10. Limits A to D correspond to output limit signals output from the controller 30 to the rotary machine driving power converter 22. Limit A is a limiting value equivalent to the rated value, Limit B is a value lower than Limit A (eco driving stage 1), Limit C is a value lower than Limit B (eco driving stage 2), and Limit D is a value lower than Limit C and a limiting value at which the minimum ship speed can be maintained.

[0038] First, the sea section from the port of departure / arrival is divided into section K1 and section K2 according to the ship position branching condition 101, as illustrated in Fig. 5. Section K1 is a section from departure to the set section, in which the remaining energy of the power storage means 10 is large, while section K2 is a section toward arrival at port, in which the remaining energy of the power storage means 10 is low compared to section K1. The section may be divided into two or more sections, and the interval between the sections may be arbitrary.

[0039] In the case of section K1, the vessel speed branching condition 102 branches into whether the vessel speed is greater than or equal to a set vessel speed or less than a set vessel speed. If the vessel speed is greater than or equal to a set value, the state-of-charge condition 103 of the electricity storage means 10 switches the limit value given to the rotary machine driving power converter 22 according to the rate of state of charge.

[0040] In the example shown in FIG. 6, when the state of charge is 50% or more, limit A is selected, allowing the rated output of the rotating machine 80. Next, when the state of charge is in the range of 20 to 50%, limit C is selected, allowing eco-driving with reduced output. In section K1, which is the first half of the route, limit C is set instead of limit B in order to suppress the decrease in the remaining charge of the power storage means 10. Also, when the state of charge is less than 20%, limit D is selected, minimizing the usage of the power storage means 10 and maintaining the minimum ship speed while suppressing the decrease in the remaining charge.

[0041] On the other hand, in the vessel speed branching condition 102, when the vessel speed is below the set value, the limit value given to the rotating machine driving power converter 22 is switched according to the proportion of the state of charge according to the state of charge condition 113 of the power storage means 10. Since the vessel speed is below the set value and the effect of reducing the output power is small even if a limit is applied, when the state of charge is 20% or more, limit A is selected, enabling the rated output of the rotating machine 80, and when the state of charge is less than 20%, limit D is selected, minimizing the usage of the power storage means 10 and suppressing a decrease in the remaining charge while maintaining the minimum vessel speed.

[0042] The above-mentioned percentages of the state of charge are values ​​that are set virtually for the purpose of explanation, and may be any value. The number of branches in the state of charge condition of the power storage means 10 may be configured in multiple stages other than those shown in FIG. 6, and the number of eco-driving stages may be any number. Furthermore, the state of charge condition 113 of the power storage means 10 may also have a branch for eco-driving. The limit A may be a value lower than the rated value (corresponding to eco-driving). The limit D may have a likelihood against normally foreseeable disturbances, as it is obtained in advance from experiments or actual measurements.

[0043] When the ship position condition 101 is section K2, the limit value is selected based on the ship speed and the state of charge of the power storage means 10 in the same manner as in section K1, so that a duplicate explanation of each will be avoided.

[0044] The difference between section K1 and section K2 is the selected limit value, and in section K2, when the state of charge of the electricity storage means 10 is high, limit B, which is lower than limit A, is selected. The selected limit value may be determined according to the selected section, and it is acceptable for the section to change during navigation.

[0045] (effect) As described above, according to the energy management system 1, by limiting the output to the propeller 90 in accordance with the position of the ship, the ship's speed, and the state of charge of the power storage means 10 installed on the ship, it is possible to suppress load fluctuations and a decrease in ship speed, while also enabling eco-friendly driving.

[0046] <Second embodiment> (composition) FIG. 7 is a block diagram showing an example of the configuration of an energy management system according to the second embodiment of the present invention.

[0047] This embodiment is a modified example of the first embodiment, and in contrast to the energy management system 1 shown in Fig. 1, an energy management system 2 is connected to a rotating machine driving power converter 23, which uses the output of the storage means 10 as a power source, converts direct current into alternating current, and drives and controls a rotating machine 80 connected coaxially to a propeller 90, instead of the rotating machine driving power converter 22. In addition, an output signal from the controller 30 is also connected to the rotating machine driving power converter 23. The rotating machine driving power converter 23 is capable of bidirectional power conversion. The other components are similar to those of the first embodiment, so repeated explanations will be avoided.

[0048] (action) This embodiment is a modified example of the first embodiment, in which position information and ship speed information from a satellite positioning system 40 and charging information for the power storage means 10 are input to a controller 30, and output limitation of the rotating machine driving power converter 23 is performed according to instructions from the controller 30.

[0049] (effect) As described above, the energy management system 2 can switch the output limit value of the rotary machine driving power converter 23 according to a combination of the ship's position information and ship speed information, and the charging information of the power storage means 10. Note that the selection of the limit value is similar to that in the first embodiment, so a duplicated description will be avoided.

[0050] <Third embodiment> (composition) FIG. 8 is a block diagram showing an example of the configuration of an energy management system according to the third embodiment of the present invention.

[0051] The block diagram shown in Fig. 8 differs from the block diagram shown in Fig. 1 in that prime mover 70 is connected coaxially to propeller 90 and rotating machine 80. The connection of prime mover 70 is not limited to being coaxial with rotating machine 80, and may be an interlocking shaft configuration via a transmission. The configuration of energy management system 3 shown in Fig. 8 is similar to that of energy management system 1 shown in Fig. 1, and therefore the same components are denoted by the same reference numerals to avoid redundant explanation.

[0052] (action) In the energy management system 3, similarly to the energy management system 1, position information and ship speed information from the satellite positioning system 40 and charging information from the power storage means 10 are input to the controller 30, and the controller 30 limits the output of the rotary machine driving power converter 22 so that the output to the propeller 90 is constant. The method of selecting the limit value is the same as in the first embodiment, so a duplicated explanation will be avoided.

[0053] FIG. 9 is a diagram showing the driving characteristics of the energy management system according to the third embodiment of the present invention when including a prime mover.

[0054] When the propeller 90 is under a lighter load than a predetermined load, the load on the prime mover 70 decreases, and the operating point may become inefficient. In this case, the energy management system 3 uses the controller 30 to compare the output at which the prime mover 70 can be efficiently operated with the output at the operating point, and calculates the surplus power. The controller 30 further provides the rotating machine driving power converter 22 with a negative output limit value that is the amount of power corresponding to this surplus power. This allows the rotating machine 80, which is coaxially connected to the prime mover 70, to recover power, and the power converter 22 for driving the rotating machine and the charging / discharging power converter 21 to store the power in the power storage means 10, thereby enabling effective use of energy. In calculating the surplus power, the value of the optimal operating point of the generator output may be used instead of the motor characteristics.

[0055] (effect) As described above, according to the energy management system 3, in a ship that includes the prime mover 70 to power the rotating machine 80, the output to the propeller 90 is controlled to be constant according to the ship's position, ship speed, and the state of charge of the electricity storage means 10 mounted on the ship, thereby maintaining the ship speed while suppressing load fluctuations and enabling eco-friendly operation. This also leads to suppression of load fluctuations on the prime mover 70. Furthermore, in a ship that mainly operates the prime mover 70, it is possible to suppress a decrease in the efficiency of the system including the prime mover 70 and realize effective energy utilization.

[0056] <Fourth embodiment> (composition) FIG. 10 is a block diagram showing an example of the configuration of an energy management system according to the fourth embodiment of the present invention.

[0057] This embodiment is a modified example of the third embodiment, and in contrast to the energy management system 3 shown in Fig. 8, an energy management system 4 is connected to a rotating machine driving power converter 23 that uses the output of the storage means 10 as a power source to drive and control a rotating machine 80 that is connected coaxially with a propeller 90, instead of the rotating machine driving power converter 22. In addition, an output signal from the controller 30 is also connected to the rotating machine driving power converter 23. As the rest is similar to the third embodiment, repeated explanations will be avoided.

[0058] (action) This embodiment is a modification of the third embodiment, in which position information and ship speed information from a satellite positioning system 40 and charging information for the power storage means 10 are input to a controller 30, and the controller 30 can control the output of the rotary machine driving power converter 23 so that the output to the propeller 90 is constant. Note that the selection of the limit value is similar to that of the first embodiment, so a duplicated explanation will be avoided.

[0059] (effect) The energy management system 4 according to this embodiment can also achieve the same effects as the energy management system 3 according to the third embodiment.

[0060] <Fifth embodiment> (composition) FIG. 11 is a block diagram showing an example of the configuration of an energy management system according to the fifth embodiment of the present invention.

[0061] This embodiment is a modified example of the first embodiment, and the energy management system 5 has a power storage means 11 that stores inertial energy instead of the power storage means 10 in the energy management system 1, and further includes an AC / DC power converter 24 that converts the AC power output from the power storage means 11 into DC.

[0062] The AC / DC power converter 24 is capable of bidirectional power conversion, and the DC output of the AC / DC power converter 24 is connected to the charge / discharge power converter 21 .

[0063] Charging information for the power storage means 11 is also input to the controller 30 .

[0064] The charging information of the power storage means 11 can be information indicating the degree of inertia, such as rotation speed or rotation position information.

[0065] Other components are similar to those in the first embodiment, and therefore repeated explanations will be avoided. As in the third embodiment, the energy management system 5 can also be applied to a configuration in which the rotating machine 80 is combined with the prime mover 70.

[0066] (action) The power storage means 11 can be realized, for example, by including a rotating machine 11a driven by a power converter, similar to the rotating machine 80. The AC power output from the power storage means 11 is converted to AC by the AC / DC power converter 24, and is further converted to AC power of a voltage and frequency suited to the AC load 60 by the charging / discharging power converter 21 and supplied.

[0067] The output of the charge / discharge power converter 21 is also connected via a filter 21 a to a rotating machine driving power converter 22 that drives and controls a rotating machine 80 that is coaxially connected to the propeller 90 .

[0068] The controller 30 receives position information and ship speed information from the satellite positioning system 40, and charging information from the power storage means 11. In response to this information, the controller 30 generates an output limiting signal for limiting the output of the rotating machine driving power converter 22, and outputs it to the rotating machine driving power converter 22. This instructs the rotating machine driving power converter 22 to limit its output. Note that the selection of the limiting value is the same as in the first embodiment, so a duplicated explanation will be avoided.

[0069] (effect) The energy management system 5 according to this embodiment can achieve the same effects as the energy management system 1 according to the first embodiment.

[0070] Sixth embodiment (composition) FIG. 12 is a block diagram showing an example of the configuration of an energy management system according to the sixth embodiment of the present invention.

[0071] This embodiment is a modification of the fifth embodiment, and the energy management system 6 includes a rotating machine driving power converter 23 instead of the rotating machine driving power converter 22 in the energy management system 5. An output limiting signal is input to the rotating machine driving power converter 23 from the controller 30. The other components are similar to those of the fifth embodiment, so duplicated explanations will be avoided.

[0072] (action) This embodiment is a modification of the fifth embodiment, and the controller 30 receives position information and ship speed information from a satellite positioning system 40, and charging information for the power storage means 11. The rotating machine driving power converter 23 has its output limited in response to an instruction from the controller 30. Note that the selection of the limit value is the same as in the first embodiment, so a duplicated explanation will be avoided.

[0073] (effect) The energy management system 6 according to this embodiment can also achieve the same effects as the energy management system 1 according to the first embodiment.

[0074] Seventh embodiment (composition) An energy management system according to a seventh embodiment of the present invention will be described.

[0075] The energy management system according to the seventh embodiment has a configuration in which a switching controller as shown in FIG.

[0076] That is, FIG. 13 is a conceptual diagram showing a switching controller applied in the seventh embodiment of the present invention.

[0077] 13, 301 is the current limit value (limit value 1), 302 is the limit value after switching (limit value 2), 303 is the limit value to be output (limit value 3), 400 is a switching controller, and 401 is a switching pattern. The switching pattern 401 is set in advance. The switching pattern 401 is stored in the switching controller 400.

[0078] The switching controller 400 may be provided in connection with the controller 30. Also, instead of being provided in connection with the controller 30, the switching controller 400 may be provided within the controller 30 as a part of the controller 30.

[0079] Limit value 301 and limit value 302 are determined by controller 30 (if switching controller 400 is provided inside controller 30 , by a portion of controller 30 other than switching controller 400 ) and input to switching controller 400 .

[0080] The switching controller 400 generates a limit value 303 using the limit values ​​301 and 302 and the switching pattern 401, and outputs the limit value 303 to the rotating machine driving power converter 22 (in the case of the energy management systems 1, 3, and 5) or the rotating machine driving power converter 23 (in the case of the energy management systems 2, 4, and 6).

[0081] The limit values ​​input to the switching controller 400 are not limited to two types such as the limit values ​​301 and 302, and may be three or more types. Also, the output limit value may be switched by changing the rate.

[0082] (action) As shown in the first to sixth embodiments, the limit value is switched depending on various conditions of the ship. For example, the switching control can be started by the switching controller 400 according to the characteristics set by the switching pattern 401 at the time when a difference occurs between the current limit value 301 and the switched limit value 302 switched by the condition selection (the time when the limit value is changed), and can be ended at the time when the current limit value 301 and the switched limit value 302 match.

[0083] The characteristic of the switching pattern 401 is not limited to a straight line as shown in Fig. 13, but may be a change according to a rate-changing function. The limit value 303 to be output may be detected and calculated by automatic control such as feedback control.

[0084] Furthermore, the start and end timings of the switching control by the switching controller 400 may be any timing regardless of the difference between the limit values, and may be obtained from an external signal or a calculation result.

[0085] (effect) As described above, according to the energy management system to which the switching controller 400 described in this embodiment is applied, when the output limit value to the propeller 90 is switched, the change is not gradual but rather occurs gradually, thereby suppressing shocks when limiting the output, further suppressing load fluctuations, suppressing a decrease in boat speed, and enabling eco-driving.

[0086] (Effects of the Invention) In this way, according to the energy management systems 1 to 6 of the present invention, by combining the ship's position information and ship speed with the storage information of the storage means 10, 11, the propulsion motor output is limited, thereby preventing a decrease in speed and enabling eco-driving that makes maximum use of the stored energy while suppressing fluctuations in the rotating machine 80.

[0087] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and spirit of the invention. [Explanation of symbols]

[0088] 1~6 Energy management system, 10,11 Electricity storage means, 11a Rotating Machine 21 Charge / discharge power converter, 21a filter, 22, 23 Power converter for driving a rotating machine, 24 AC / DC power converter, 30 Controller, 40 Satellite positioning system, 60 load, 70 Prime movers, 80 Rotating Machines, 90 propeller, 301~303 Limit value, 400 Switching controller, 401 Switching Pattern

Claims

1. A storage means; a charge / discharge power converter capable of bidirectionally converting the output of the power storage means; a rotating machine driving power converter that drives a rotating machine for propelling a ship using the AC output of the charge / discharge power converter as a power source; a controller that receives as input the position information and speed information of the ship acquired from a positioning system and the charging information of the power storage means, and outputs a limiting signal to the rotary machine driving power converter; Equipped with an energy management system.

2. A storage means; a charge / discharge power converter capable of bidirectionally converting the output of the power storage means; a power converter for driving a rotating machine, which uses the output of the power storage means as a power source and converts direct current into alternating current; a controller that receives as inputs the position information and speed information of the ship acquired from a positioning system and the charging information of the power storage means, and outputs a limiting signal to the electric power converter for driving the rotary machine; Equipped with an energy management system.

3. The energy management system of claim 1 , wherein the rotating machine is driven by a prime mover.

4. 3. The energy management system according to claim 1, wherein the power storage means is constituted by a device having inertia.

5. 3. The energy management system according to claim 1, further comprising: a switch for switching an output limit value of the rotary machine driving power converter in response to a combination of position information, ship speed information, and charging information of the power storage means.

6. 2. The energy management system according to claim 1, wherein when the rotating machine is under a load lighter than a predetermined load, the controller sets the output limit value of the rotating machine driving power converter to a negative value.

7. The energy management system according to claim 5 , wherein the controller changes the output limit value at a varying rate.

8. The energy management system of claim 5 , wherein the controller applies a torque limit instead of the power limit.

9. The energy management system of claim 5 , wherein the controller applies a speed command instead of the power limit value.

10. The energy management system according to claim 6 , wherein the controller changes the output limit value at a varying rate.

11. The energy management system of claim 6 , wherein the controller applies a torque limit instead of the power limit.

12. The energy management system of claim 6 , wherein the controller applies a speed command instead of the power limit value.

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