JP6175281B2 - Ship propulsion boosting system - Google Patents

Description

  The present invention relates to a ship propulsion boosting system that uses an axial drive generator.

  A propeller for propulsion of a ship is connected to a main engine composed of a diesel engine or the like, and in normal times, the ship is propelled by driving the main engine. In addition, a shaft drive generator is connected to the main shaft connected to the propeller, and this shaft drive generator generates power by driving the main shaft during normal operation, and the power conversion device includes a converter and an inverter for the generated power. The power can be supplied to the inboard bus by frequency conversion and voltage conversion.

  In addition, the power supplied via the inboard bus is frequency converted by this power converter, and the main drive shaft is driven by operating the shaft-driven generator as a synchronous motor. Used for propulsion. That is, the shaft drive generator is used for both a generator and an electric motor.

  The operation of the shaft drive generator 4 has two operation modes: a “power generation mode” used as a generator, and an “emergency travel mode” and a “propulsion boost mode” used as an electric motor. A conventional “propulsion boost mode” will be described with reference to FIG.

  The main machine 1 is a ship propulsion source, and drives the ship by decelerating the propeller 3 through a step-up gear 2 connected to the main machine shaft 1a. At the same time, in the “power generation mode”, the shaft drive generator 4 is driven at an increased speed via the step-up gear 2. The electric power generated by the shaft drive generator 4 supplies desired electric power to the ship through the inboard bus 6 by the electric power converter 5 having a function of converting the frequency.

  When the shaft drive generator 4 is used as a propulsion motor, power is supplied from the inboard bus 6 to the power converter 5, and the supplied power is adjusted to a frequency corresponding to the rotational speed of the shaft drive generator 4 by the power converter 5. After the conversion, electric power is supplied to the shaft drive generator 4, and the propeller 3 is driven at a reduced speed via the step-up gear 2 as an electric motor. In this case, there are two operation modes of “emergency cruise mode” and “propulsion boost mode”.

  The “emergency cruise mode” is a mode in which the shaft drive generator 4 is operated as an electric motor to prevent drifting of the ship when the main engine 1 is stopped due to a failure or the like, and the operation of the main engine 1 is completely stopped. The shaft drive generator 4 is driven as an electric motor, and the vessel is propelled only by the driving force of the electric motor.

  “Propulsion support mode” is a state in which the main engine 1 is driven, and when it is desired to obtain further propulsive power or when there is surplus power in the ship, the driving power of the main engine 1 is reduced and the surplus power is used to In this mode, the drive generator 4 is operated as an electric motor, and the propulsion of the ship is performed by the driving force of the main drive 1 and the shaft drive generator 4 operated as an electric motor.

Japanese Patent Application Laid-Open No. 2004-5050

  When such a shaft drive generator is used as an electric motor, in the “emergency cruise mode”, the electric motor 5 changes the frequency by the power converter 5 in order to increase the rotation from the state where the main engine 1 is stopped to a desired rotational speed. Need to drive.

  On the other hand, in the “propulsion boost mode”, it is necessary to operate the motor while constantly changing the frequency by the power converter 5 in accordance with the change in the rotational speed of the main engine 1.

  Thus, since it is necessary to control the frequency in both the “emergency traveling mode” and the “propulsion boost mode”, the power conversion device 5 is necessary. However, the power conversion device 5 causes a power loss of about 10% when the frequency is converted, resulting in a problem that the power conversion efficiency is deteriorated. This power loss also occurs in the “power generation mode”.

  The present invention has been made to solve such a problem, and in the propulsion boost mode, when a certain condition is satisfied, the vessel propulsion having excellent power efficiency can be achieved without using the power conversion device 5. To provide a support system.

The present invention relates to a ship propulsion boosting system that uses an axial drive generator in a state where a main machine that drives a propeller is driven, and controls the frequency and voltage that are driven by the main machine and that are driven by the main machine. A shaft drive generator that supplies power to the inboard bus via a power converter, and when the main engine is propelled and energized, the shaft drive generator is supplied with power from the inboard bus and driven as a propulsion motor. In the ship propulsion and energization system configured to propulsion and energize, a switching device that enables power to be directly supplied from the inboard bus line to the shaft-driven generator without going through the power converter, Promotion Kase is required, the propulsion Kase mode, when the output frequency and voltage of the shaft driving the generator coincides with the frequency and voltage of the onboard bus The shaft drive generator is synchronously charged to the inboard bus by the switching device, and the main engine is propelled and energized by driving the shaft drive generator directly as a propulsion motor by electric power of the inboard bus. To do.

  Furthermore, it is to automate the switching operation of the switching device when the frequency and voltage conditions are met.

  Furthermore, when the propulsion propeller is a variable pitch propeller (CPP), the main engine has a constant rotation speed, and the output frequency and voltage of the shaft-driven generator become the frequency and voltage of the inboard bus. The switching means synchronously inputs the power of the inboard mother ship to the shaft drive generator and directly drives it as an electric motor.

1 is a schematic configuration diagram of Embodiment 1 of the present invention. The schematic block diagram of Embodiment 2 of this invention. The schematic block diagram of the conventional ship propulsion support system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Parts having the same reference numerals as those described in FIG.

(Embodiment 1)
As shown in FIG. 1, in the present embodiment, the main engine 1 is, for example, a diesel engine, and drives a propulsion propeller 3 that propels a ship. A step-up gear 2 is arranged between the main machine 1 and the propeller propeller 3 to reduce the rotational speed of the main machine shaft 1 a and transmit it to the propeller 3. Further, a shaft drive generator 4 is connected to the step-up gear 2 and is rotated at an increased speed in synchronization with the rotation of the main shaft 1a. The shaft drive generator 4 is connected to a power converter 5 that converts voltage and frequency. Further, the shaft drive generator 5 is connected to the inboard bus 6.

  Switches 7, 8, 9 serving as switching devices are inserted into each connection circuit between the shaft drive generator 4, the power converter 5 and the inboard bus 6.

  The electric power of the shaft drive generator 4 is supplied to the inboard bus 6 via the power conversion device 5, or the shaft drive generator 4 can be driven as an electric motor via the power conversion device 5 with the electric power of the inboard bus 6. Yes. An inboard load 12 and a diesel generator 11 are connected to the inboard bus 6. Although not shown, a synchronous phase adjuster is connected to the inboard bus side of the power converter.

  The power conversion device 5 includes, for example, a thyristor that includes a converter that converts AC power into DC once and an inverter that converts the converted DC into AC having a required frequency and simultaneously controls the voltage.

  The present embodiment relates to a ship propulsion energizing system applied to the propulsion energizing mode for driving the propulsion propeller 3 using the shaft-driven generator 4 as an electric motor, and switches 7, 8, 9 and shaft-driven power generation as switching devices for switching current paths. A control device 10 is provided for controlling the switch by detecting the rotation of the machine and comparing the frequency of the inboard bus.

  The first switch 7 is installed by bypassing the power converter 5 between the inboard bus 6 and the shaft drive generator 4, and the second switch 8 and the third switch at both ends of the power converter 5, respectively. 9 is provided. The switches 7, 8, and 9 are devices for intermittently energizing an electric circuit configured by, for example, an electromagnetic contactor.

  In the “power generation mode”, the shaft-driven generator 4 is driven in synchronism with the rotation of the main shaft 1a, so that the frequency of the generated power varies according to the rotation of the main shaft.

  On the other hand, the inboard bus 6 is provided with a diesel generator 11 and supplies a constant alternating current of 60 Hz, for example, to the inboard load 12.

  The power converter 5 enables mutual power feeding by converting and adjusting the frequency power of the shaft drive generator 4 and the constant frequency power of the inboard bus 6. In the “power generation mode”, the shaft drive generated power is converted into the inboard bus. 6. In the “emergency cruise mode” and “propulsion boost mode”, the power of the inboard bus 6 is supplied to the shaft drive generator 4 to operate as a motor, and the propeller 3 is energized via the step-up gear 2. .

  In the “power generation mode” and the “emergency traveling mode”, the second switch 8 and the third switch 9 are closed and the first switch 7 is opened.

  Switching of the switches 7, 8, 9 is selectively performed in the “propulsion boost mode”. That is, normally, the second and third switches 8 and 9 are closed and the power converter 5 is operated, but only when the rotational speed of the shaft drive generator 4 is equivalent to 60 Hz, that is, with the inboard bus 6 When the frequency and voltage of the shaft drive generator 4 match, the second and third switches 8 and 9 are opened to cut off the circuit passing through the power converter 5, and at the same time the first switch 7 is closed and synchronized. By energizing the electric circuit, the electric power from the inboard bus 6 is supplied directly to the shaft drive generator 4 via the switch 7, and the main motor 1 is used as a propulsion motor by avoiding the power converter 5 having low conversion efficiency. Energize. Thereby, the ship propulsion boosting system excellent in power efficiency can be obtained.

  At this time, the ship is navigating the open ocean at a substantially constant speed, and the main engine 1 is in a state of maintaining a constant rotational speed without changing the rotational speed. The shaft drive generator 4 is driven as an electric motor at 60 Hz and is synchronized with the rotation speed of the main machine.

  In addition, it is desirable to automatically switch the operation of the switch. The control device 10 detects when the conditions for the voltage and frequency of the inboard bus 6 and the shaft drive generator 4 are met, that is, when the conditions for operating the shaft drive generator 4 in the “propulsion boosting mode” using the propulsion motor are met. , A ship propulsion boosting system that can switch the switching operation of the switch 7 and the openers 8 and 9 automatically, synchronize it, and put it into the “propulsion boosting mode” to continue the period with excellent power conversion efficiency in a timely manner. Can be obtained.

(Embodiment 2)
A second embodiment will be described with reference to FIG. In the figure, the difference from the first embodiment is that the propulsion propeller 3 is replaced with a variable pitch propeller 3a. The variable pitch propeller (CPP: Controllable Pitch Propeller) can change the pitch angle of the wings of the propeller, so that the speed of the ship can be adjusted freely with the main engine 1 always rotating at the most efficient speed. This technology has the advantage of being able to be used and has been widely used in recent years. In the present embodiment, by using the variable pitch propeller 3a, the main engine 1 is kept at a constant rotational speed, and the frequency and voltage of the inboard bus 6 and the shaft drive generator 4 are matched so that a predetermined fluctuation range of the ship speed is obtained. Are matched with a variable pitch propeller so that they coincide for a long period regardless of the speed of the ship. In this state, the control device 10 closes the first switch 7, opens the second and third switches 8 and 9, and synchronizes the power of the inboard bus 6 to the shaft drive generator 4 to directly drive the motor. As a result, it is possible to obtain a ship propulsion boosting system that can avoid the power conversion device 5 in which power loss occurs and can continue a period of excellent power conversion efficiency for a longer time.

  In addition, by setting the most efficient rotation speed of the main engine to the rotation speed 60 Hz of the shaft drive generator 4, it is possible to obtain a ship propulsion boosting system that has further improved fuel efficiency and power conversion efficiency.

  As described above, according to the ship propulsion and energization system of the present invention, it is provided with switching means for supplying power directly from the inboard bus without going through the power converter, and the shaft drive generator is driven as an electric motor by this switching means. As a result, it is possible to obtain a ship propulsion boosting system that is excellent in efficiency.

  Although the present invention has been described with reference to the above-described embodiments, it is needless to say that the present invention is not limited to these and various modifications can be made within the scope of the invention.

1: main engine 2: step-up gear 3: propulsion propeller 3a: variable pitch propeller 4: shaft drive generator 5: power converter 6: inboard bus 7: first switch 8: second switch 9: third switch 10: Control device

Claims (4)

In relation to a ship propulsion boosting system using an axial drive generator in a state where a main machine that drives a propeller is driven, a main machine that drives the propeller, and a power converter that is driven by the main machine and controls a frequency and a voltage. A shaft-driven generator that supplies power to the inboard bus via
In the vessel propulsion and energization system configured to propel and energize the main unit by receiving electric power supplied from the inboard bus and driving the propulsion motor when propulsion and energizing the main unit, the power from the inboard bus A switching device that enables power to be supplied directly to the shaft-driven generator without going through a converter,
When the propulsion boost is required for the main engine, and the output frequency and voltage of the shaft drive generator coincide with the frequency and voltage of the inboard bus in the propulsion boost mode, the shaft drive generator is A ship propulsion and energization system, wherein the main engine is propelled and energized by being synchronously inserted into an inboard bus and driving the shaft-driven generator directly as a propulsion motor with electric power of the inboard bus.   2. The ship propulsion boosting system according to claim 1, wherein the switching operation of the switching device is automated when conditions for synchronizing the frequency and voltage of the shaft-driven generator and the inboard bus are aligned. .   2. The ship propulsion boosting system according to claim 1, wherein the propeller is a variable pitch propeller, the rotation speed of the main engine is constant, and the output frequency and voltage of the shaft drive generator are the frequency and voltage of the inboard bus. The ship propulsion boosting system is characterized in that the shaft drive generator is synchronously inserted into the inboard bus by the switching device and is directly driven as a propulsion motor. The ship propulsion and boosting system according to any one of claims 1 to 3, wherein the switching device includes the shaft-driven generator and the inboard bus, the shaft-driven generator and the power converter, and the power converter and A ship propulsion boosting system comprising a switch inserted between inboard busbars.

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