JP5584750B2 - Electric propulsion ship control system and electric propulsion ship - Google Patents

Description

  The present invention relates to an electric propulsion ship control system for supplying electric power to a propulsion motor for driving a screw of an electric propulsion ship, and an electric propulsion ship equipped with the electric propulsion ship control system.

  In recent years, electric propulsion systems for ships have been developed in order to reduce greenhouse gases such as exhaust gas and carbon dioxide that are generated while the ship is sailing. For example, in Patent Document 1, a technology for propelling a ship by mounting a hybrid power source composed of a power generation device and a storage battery charged by the power generation device on a ship and supplying electric power from the storage battery in the hybrid power supply to a propulsion motor. Is disclosed. In addition, charging the regenerative power generated in the propulsion motor to the storage battery is also disclosed.

JP 2011-235840 A

  The technology of Patent Document 1 is equipped with a hybrid power supply, and regenerative power generated in the propulsion motor during charging is charged to the storage battery to effectively use energy. Basically, the output power of the generator Is to be navigated by.

  Therefore, it is necessary to mount the generator and the fuel for driving it on the ship, which increases the loading weight. This leads to an increase in fuel consumption, so there is room for improvement from the viewpoint of energy saving. On the other hand, in order to navigate for a long time using only the power of the storage battery mounted on the ship, it is necessary to mount a large-capacity storage battery and to charge the large-capacity storage battery in a short time. However, Patent Document 1 does not disclose specific means for solving these problems.

  The present invention has been made in view of the above, and it is possible to charge a large-capacity storage battery in a short time, and furthermore, an electric propulsion ship control system capable of effectively using regenerative power generated by a propulsion motor, and It is an object to provide an electric propulsion ship equipped with an electric propulsion ship control system.

  In order to solve the above problems, an electric propulsion ship control system of the present invention is an electric propulsion ship control system for supplying power to a propulsion motor that drives a screw propelling an electric propulsion ship, and receives power from a commercial power source on land. A power receiving seat for land power, a transformer for transforming an AC voltage supplied via the power receiving seat for the land power, and a predetermined voltage after converting the alternating current transformed by the transformer to direct current. A DC / DC converter that transforms a direct current to a voltage, a lithium-ion battery that is charged with a direct current of a predetermined voltage transformed by the DC / DC converter, and the DC / DC converter and the propulsion motor. And an inverter that converts direct current stored in the lithium ion battery into alternating current in order to supply electric power to the propulsion motor.

  Between the DC / DC converter and the lithium ion battery, a first circuit having a resistance and a second circuit having no resistance are provided in parallel, and between the DC / DC converter and the lithium ion battery. It is preferable that the first circuit is initially energized to flow and then the first circuit is controlled to be shut off after the second circuit is energized. Furthermore, it is preferable that the regenerative power generated by the propulsion motor is charged to the lithium ion battery via the inverter.

  The electric propulsion ship according to the present invention is equipped with the electric propulsion ship control system described above.

  According to the present invention, the electric propulsion ship control system converts an alternating voltage from a land commercial power source (land power source) into a direct current after being transformed by a transformer, and further, a direct current of a predetermined voltage is obtained by the DC / DC converter. It has the structure which transforms to. Since it is configured to be charged by a transformed direct current of a predetermined voltage, it is possible to charge a lithium ion battery capable of storing a large capacity in a short time. For this reason, a large-capacity lithium ion battery can be charged in a short time while the ship is anchored by using the onshore power source, and long-term continuous navigation can be achieved.

  In addition, when direct current of a predetermined voltage transformed by the DC / DC converter is supplied to the lithium ion battery and when direct current stored in the lithium ion battery is supplied to the DC / DC converter side, the initial stage has resistance. It is preferable to use a configuration in which the current flows through the first circuit and then flows through the second circuit having no resistance. As a result, since current control is performed with resistance in the initial stage of energization, damage to the DC / DC converter or the like due to a direct current of a predetermined voltage flowing at a stretch can be prevented.

  In the present invention, since the regenerative power generated by the propulsion motor is configured to be charged to the lithium ion battery, the energy use efficiency is excellent, the energy saving effect is high, and the reduction of greenhouse gases generated during navigation. Also contributes.

FIG. 1 is a configuration diagram of an electric propulsion ship control system according to an embodiment of the present invention. FIG. 2 is a side view schematically showing the internal configuration of the electric propulsion ship of FIG. FIG. 3 is a plan view schematically showing an internal configuration of the electric propulsion ship of FIG.

  Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. FIG. 1 is a configuration diagram of an electric propulsion ship control system 1 according to one embodiment of the present invention, which is mounted on the electric propulsion ship 20 shown in FIGS. 2 and 3.

  Here, for ease of understanding, first, a schematic configuration of the electric propulsion ship 20 according to one embodiment of the present invention will be described. As shown in FIGS. 2 and 3, in the electric propulsion ship 20 of the present embodiment, the hull 21 is made of aluminum, and has a total length of 10 to 20 m, a width of 3 to 5 m, and a capacity of about several tens of people. Of course, the present invention is applicable to both larger and smaller sizes. In addition, a passenger cabin 22 in which a pilot seat 23 and a passenger seat 28 are arranged is provided at the front part in the forward direction of the electric propulsion ship 20, and various devices for propelling the electric propulsion ship 20 are arranged at the rear part in the forward direction. A power chamber 30 is provided.

  The screw 38 that propels the electric propulsion ship 20 is rotated by a screw shaft 37 that extends into the water from the bottom of the stern near the center in the width direction. The screw shaft 37 is rotationally driven by a propulsion motor 36 disposed in the power chamber 30. As the electric motor 36 for propulsion, for example, an AC motor of 1000 to several thousand rpm with 10 to several tens kw is used, and for example, the propulsion motor 36 is set so as to be able to navigate at a speed of several knots or more. When a DC motor is used as the propulsion motor 36, it is necessary to perform rotation control with a gear as a speed reduction means. However, since the AC motor can be electrically controlled, the structure can be simplified and suitable for weight reduction.

  A propulsion motor control panel 10 that controls the driving of the propulsion motor 36 and an inboard power distribution panel 34 are arranged on the front side of the power chamber 30, and lithium ion batteries 32 and 33 that supply power to the propulsion motor 36. The power chamber 30 is arranged in parallel at substantially the center. In this embodiment, each lithium ion battery 32 and 33 is comprised by the battery assembly pack, and each can store the electric power of a large capacity | capacitance of several tens kw. A plurality of small-capacity batteries 35 are arranged on the rear side of the power chamber, and these are used as general power sources for inboard lighting, steering electronic devices, electric heating devices, and other devices. It is done.

  The electric propulsion ship 20 is provided with power receiving seats 31R and 31L for receiving AC from a land commercial power source (land power source) (see FIG. 1), and through these power receiving seats 31R and 31L, A power source, for example, AC 220 V, 50 A power is supplied to the lithium ion batteries 32 and 33.

  As shown in FIG. 1, the electric propulsion ship control system 1 of this embodiment mounted on the electric propulsion ship 20 includes the above-described two lithium ion batteries 32 and 33 and power receiving seats 31R and 31L, and propulsion. The electric motor control panel 10 is provided with a control circuit for charging the lithium ion batteries 32 and 33 via the power receiving seats 31R and 31L. More specifically, a transformer 11, an AC / DC converter 12, and a DC / DC converter 13 that is a chopper circuit are provided. Between the power receiving seats 31R and 31L and the AC / DC converter 12, a circuit breaker (MCCB1, MCCB2) for overcurrent protection and an electromagnetic contactor (MC2) for controlling the flow of current are provided. ing.

  The transformer 11 transforms the AC voltage supplied via the power receiving seats 31R and 31L for land power. For example, AC220V received by the power receiving seats 31R and 31L is boosted to AC480V by the transformer 11. The AC / DC converter 12 converts the alternating current boosted by the transformer 11 into direct current.

  The DC / DC converter 13 transforms the direct current converted by the AC / DC converter 12 into a direct current voltage suitable for charging. This predetermined voltage refers to a voltage for charging under optimum conditions by the voltage of each of the lithium ion batteries 32 and 33. In the present embodiment, the DC voltage converted by the AC / DC converter 12 is transformed so as to be charged with a current value as commanded, and the lithium ion batteries 32 and 33 are charged.

  According to the present embodiment, with the above configuration, it is possible to convert / transform the AC voltage (AC220V) from the onshore power source into a predetermined voltage (for example, DC500V). For this reason, even if the lithium ion batteries 32 and 33 have a large capacity, they can be rapidly charged in a short time. By combining the two lithium ion batteries 32 and 33, it is possible to store a large amount of electric power of, for example, several tens of kW as described above, and a continuous operation for a long time is possible.

  Here, in the propulsion motor control panel 10 of FIG. 1, in addition to the above-described configuration, a first circuit (14a or 14a) having a resistance is provided between the DC / DC converter 13 and the lithium ion batteries 32 and 33, respectively. 14b) and a second circuit (15a or 15b) having no resistance are connected in parallel. In addition, the parallel circuit of the first circuit (14a or 14b) and the second circuit (15a or 15b) includes a circuit breaker (MCCB3, MCCB4) for overcurrent protection and an electromagnetic that controls the flow of current. Contactors (MC3, MC4, MC5, MC6) are arranged.

  Specifically, between the DC / DC converter 13 and the first lithium ion battery 32 at the time of charging, the first circuit 14a causes the DC / DC converter 13 to pass a direct current of a predetermined voltage that has been transformed. In the initial stage, a circuit is provided in which a resistor R1 and an electromagnetic contactor MC5 are connected in series. After the first circuit 14a is energized by the magnetic contactor MC5 (usually after a few seconds), the second circuit 15a sets the magnetic contactor MC3 so that a direct current of a predetermined voltage transformed from the DC / DC converter 13 flows. I have. However, no resistance is provided. And the 1st circuit 14a and the 2nd circuit 15a are connected in parallel, and are connected to the 1st lithium ion battery 32 via the circuit breaker MCCB3 for wiring.

  Therefore, by first turning on the magnetic contactor MC5 of the first circuit 14a, the large current that first flows through the capacitor in the DC / DC converter is suppressed by the resistor R1 of the first circuit 14a. Thereafter, the electromagnetic contactor MC3 of the second circuit 15a is turned ON, and then the electromagnetic contactor MC5 of the first circuit 14a is turned OFF, so that only the second circuit 15a is switched.

  As a result, since the large current is initially controlled by the resistor R1 of the first circuit 14a, the capacitor is charged without flowing a large current from the lithium ion battery 32 to the capacitor in the DC / DC converter 13. Thereafter, the current flows from the DC / DC converter 13 to the lithium ion battery 32 without being controlled through the second circuit 15a to be charged. Thereby, it is suppressed that a large current flows into the DC / DC converter 13 in the initial stage of energization, and damage to the DC / DC converter 13 and the like can be prevented.

  The operation between the DC / DC converter 13 and the second lithium ion battery 33 is the same as described above.

  The electric power stored in the first lithium ion battery 32 and the second lithium ion battery 33 is supplied to a propulsion motor 36 composed of an AC motor (AC motor). Therefore, the inverter 16 is arranged between the DC / DC converter 13 and the AC motor that is the propulsion motor 36. A wiring breaker MCCB5 is disposed between the inverter 16 and the propulsion motor 36 for safety measures during charging.

  When the electric propulsion ship 20 sails, the electric power of each lithium ion battery 32, 33 first turns on the electromagnetic contactors MC5, MC6 of the first circuits 14a, 14b, and the electromagnetic contactors of the second circuits 15a, 15b. By turning off MC3 and MC4, the current flows to the DC / DC converter 13 via the resistors R1 and R2 of the first circuits 14a and 14b. Thereafter (usually after a few seconds), the magnetic contactors MC3 and MC4 of the second circuits 15a and 15b are turned on, and then the magnetic contactors MC5 and MC6 of the first circuits 14a and 14b are turned off. It switches so that the electric power of the batteries 32 and 33 may flow to the DC / DC converter 13 through the second circuits 15a and 15b that are not provided with resistors. As a result, similarly to the above, the supply of a large current from the beginning of energization is suppressed at a stretch, and damage to the DC / DC converter 13 and the like is prevented.

  The electric power of each lithium ion battery 32, 33 is supplied to the DC / DC converter 13 in a parallel circuit. In the DC / DC converter 13, for example, DC500V supplied from each of the lithium ion batteries 32 and 33 is converted into a constant direct current, for example, DC700V. Further, after being converted from direct current to alternating current by the inverter 16, it is supplied to a propulsion motor 36 composed of an AC motor which is a propulsion motor. As a result, the propulsion motor 36 rotates, the screw 38 rotates through the screw shaft 37, and the electric propulsion ship 20 propels.

  By the way, in the navigation state in which the electric propulsion ship 20 is moving forward, regenerative power is not generated in the propulsion motor 36. However, when braking is applied to reduce the speed during the navigation, the regenerative power is generated in the propulsion motor 36. Occur. In this embodiment, this regenerative electric power is directly converted into thermal energy, and the lithium ion battery is charged without being discarded. Specifically, the regenerative power current flows to the DC circuit in the inverter 16 and is then supplied to the DC / DC converter 13 to flow to the first lithium ion battery 32 or the second lithium ion battery 33 for charging. Used.

  As described above, according to the present embodiment, the regenerative power generated by the AC motor that is the propulsion motor 36 is supplied from the first lithium ion battery 32 or the second lithium ion battery 32 via the circuit of the propulsion motor control panel 10. Since the lithium ion battery 33 is charged, it is excellent in terms of energy use efficiency and has a high energy saving effect.

  1 is a BMC (Battery Management Controller), which manages the temperature, voltage, remaining amount, and the like in each of the lithium ion batteries 32 and 33. Reference numeral 17 denotes a sequencer, which controls the operation of various control devices such as a circuit breaker (MCCB1, MCCB2, MCCB3, MCCB4, MCCB5), an electromagnetic contactor (MC2, MC3, MC4, MC5, MC6).

DESCRIPTION OF SYMBOLS 1 Electric propulsion ship control system 10 Propulsion motor control panel 11 Transformer 12 AC / DC converter 13 DC / DC converters 14a and 14b First circuit 15a and 15b Second circuit 16 Inverter 20 Electric propulsion ship 31R and 31L Power receiving seat 32 One lithium ion battery 33 Second lithium ion battery 36 Electric motor for propulsion (AC motor)
37 Screw shaft 38 Screw

Claims (4)

An electric propulsion ship control system for supplying power to a propulsion motor that drives a screw propelling an electric propulsion ship,
A power reception seat for land power to receive power from land commercial power,
A transformer for transforming an AC voltage supplied via the power receiving seat for the land power source;
An AC / DC converter that converts alternating current transformed by the transformer into direct current;
A DC / DC converter that transforms the direct current converted by the AC / DC converter into a direct current of a predetermined voltage;
A lithium ion battery charged with a direct current of a predetermined voltage transformed by the DC / DC converter;
An inverter that is provided between the DC / DC converter and the propulsion motor and that converts direct current stored in the lithium ion battery into alternating current in order to supply electric power to the propulsion motor;
The DC / DC converter, electric propulsion boat control system DC is configured to supply to the inverter to convert the direct current of the constant voltage supplied from the lithium ion battery.   Between the DC / DC converter and the lithium ion battery, a first circuit having a resistance and a second circuit having no resistance are provided in parallel, and between the DC / DC converter and the lithium ion battery. When flowing the current flowing through the first circuit, the first circuit is initially energized to flow, and then the second circuit is energized, and then the first circuit is shut off to flow. Item 4. The electric propulsion ship control system according to Item 1.   The electric propulsion ship control system according to claim 1 or 2, wherein regenerative electric power generated by the propulsion motor is charged to the lithium ion battery via the inverter. An electric propulsion ship on which the electric propulsion ship control system according to any one of claims 1 to 3 is mounted.

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