JPS63220731A - Feeding method by thyristor inverter type main shaft driving generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply method using a thyristor inverter type main shaft drive generator in a ship.

[Conventional technology]

2. Description of the Related Art In recent years, from the viewpoint of energy saving and labor saving, electric power is supplied inside a ship using a thyristor inverter type main shaft drive generator driven by the main engine and a diesel generator. In other words, during normal voyages, when the main engine is operating near its rated rotation, the thyristor inverter type main shaft drive generator connected to the main shaft supplies power to the ship to stop the ship or reduce its cruising speed. When the main engine is stopped or its rotational speed is reduced, power is supplied by a diesel generator on standby.

FIG. 3 is a system diagram showing an example of a conventional power supply method.

As shown in FIG. 3, a thyristor inverter type main shaft drive generator 2 is connected to a main engine 1 that rotates a propeller 3. The output of the main shaft drive generator 2 is a thyristor inverter 4, a thyristor inverter 5, and a gray car 6.
It is then supplied to the load 7 inside the ship. Main shaft drive generator 2
A diesel engine 8 and a diesel generator 9 are used to supply power to the load 7 in the ship when the output of the engine stops.
is provided, and the output of the diesel generator 9 is supplied to the load 7 inside the ship via the gray car 10. 11 is a rotary synchronous phase adjuster connected between the thyristor inverter 5 and the breaker 6;

12 is a telegraph equipped with a speed adjustment handle for rotating the main engine 1 in forward and reverse directions; 13 is a speed regulator attached to the main engine 1 and the diesel engine 8; Commands issued by the telegraph 12 are transmitted to the main engine 1 and the diesel engine 8.

Switching from the main shaft drive generator 2 to the diesel generator 9 is performed as follows. That is, when a deceleration command for the main engine 1 is issued, the rotation speed of the main shaft drive generator 2 is reduced to the minimum rotation speed at which the main shaft drive generator can operate, and is temporarily held at this rotation speed. After the machine 9 is started and automatic synchronization is performed by the automatic synchronization device 15, the power supply to the load 7 is switched to the diesel generator 9, while the rotation of the main shaft drive generator 2 is stopped.

FIG. 4 is a graph showing the operating characteristics of the main shaft drive generator. In FIG. 4, the vertical axis is the output of the main shaft drive generator, the horizontal axis is its rotation speed, line A shows the rated output, and line B shows the onboard load. The onboard load B is approximately 90% of the rated output of the main shaft drive generator.

As shown in FIG. 4, as the rotational speed of the main engine decreases, the rated output of the main shaft drive generator also decreases and crosses the inboard load B. The point X where it intersects with the inboard load B at this time is the minimum rotational speed at which the main shaft drive generator can be operated, and the rotational speed of the main engine is temporarily held at this point X. Note that the decrease in the output of the main shaft drive generator can be corrected to some extent by increasing the rotational speed of the rotary synchronous phase modifier 11.

[Problem that the invention seeks to solve]

As mentioned above, until the power supply to the load 7 is switched to the diesel generator 9, the main engine 1, that is, the main shaft drive generator 2
As a result of temporarily holding the rotational speed of the main shaft drive generator at the minimum rotational speed at which the main shaft drive generator can be operated, the ship will sail in vain while in this holding state.

Figure 5 is a graph showing the time required to reduce the main engine's rotational speed to a predetermined value.The solid line shows the case where the main shaft drive generator is maintained at the minimum operable rotational speed for one hour, and the dashed-dotted line shows the case where it is not maintained. . As is clear from the drawings, it takes t hours to reduce the rotational speed of the main engine to a predetermined value, which is the minimum rotational speed at which the main shaft drive generator can be operated. Figure 6 is a graph showing the distance traveled by the ship until it stops sailing.The solid line shows the case where the main shaft drive generator is maintained at the minimum operating speed for one hour, and the dashed-dotted line shows the case where it is not maintained. . As is clear from the drawings, when the main shaft drive generator is maintained at the minimum operable rotational speed for one hour, the ship travels a distance of 1 more than when the rotational speed is not maintained.

As a result, there is a risk of collision when it is desired to bring the vessel to a sudden stop in the event of an emergency.

Therefore, an object of the present invention is to provide power to the ship when power is supplied by a main shaft drive generator connected to the main engine, and when the drive of the main engine is stopped or its driving force is reduced, the electric power is Until the supply is switched to a diesel generator, a thyristor pulse generator is installed that can supply power to the ship's loads without having to maintain the rotational speed of the mainshaft drive generator at the minimum operating speed of the mainshaft drive generator. Providing a power supply method using a main shaft drive generator [Another means to solve the problem] The present invention comprises a thyristor inverter main shaft drive generator driven by a main engine and a diesel generator, While the main engine is being driven at the rotational speed, power is supplied to the ship's load by the main shaft drive generator, and when the drive of the main engine is stopped or its rotational speed decreases, the power supply to the ship's load is switched to the diesel generator. In a power supply method using a thyristor inverter type main shaft drive generator, a part of the electric power generated by the main shaft drive generator is stored by a rotary synchronous phase adjuster having a flywheel connected to the main shaft drive generator. Then, based on a command to stop driving or reduce the rotation speed of the main engine, the diesel generator is driven, and the rotary synchronous generator is speeded up, and the diesel generator is synchronously turned on and the load is shifted. The present invention is characterized in that the required power is supplied to the load inside the ship by the inertia of the flywheel provided in the rotary synchronous phase adjuster until the end of the process.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a system diagram showing one embodiment of the present invention. In the drawings, parts that are the same as those in the conventional method shown in FIG. 3 are designated by the same reference numerals, and their explanations will be omitted.

In this invention, a rotary synchronous phase modifier 11 is connected between the inverter 5 and the gray car 6 in the middle of the circuit that supplies the output of the main shaft drive generator 2 to the load 7 in the ship.
A flywheel 14 is provided.

The rotary synchronous phase modifier 11 and the flywheel 14 are rotated by the output of the main shaft drive generator 2, and accumulate a portion of the output generated by the main shaft drive generator 2.

As shown in FIG. 2, when the output of the main shaft drive generator 2 decreases from point A to point 3,
Due to the inertia of the flywheel 14 attached to 1, the output 12 from the rotary synchronous phase adjuster 11 is added to the output i from the main shaft drive generator 2, and this total output I3 is supplied to the 9 loads 7. As a result, the output C required for the load 7 is compensated.

Therefore, as long as the flywheel 14 has inertia,
The necessary output for the load 7 can be obtained.

The flywheel 14 is required to have a capacity that does not reduce its rotation immediately even if the main shaft drive generator 2 stops, and has a capacity that can supply power to the load 7 for a certain period of time. It is sufficient if the output is 10 to 20% of the rated output of the machine 2.

[For production]

Since this invention is configured as described above, when a deceleration command is issued from the telegraph 12 to the main engine 1 and the main shaft drive generator 2, the diesel generator 9 is immediately driven and the rotary synchronous phase modifier 11 is activated. , for example, until the speed is increased from 60 Hz to 65 Hz and the output of the diesel generator 9 reaches its rated value, the inertia of the flywheel 14 attached to the rotary synchronous phase modifier 11 supplies the required power to the load 7 inside the ship. supply

Therefore, as in the past, the number of revolutions of the main shaft drive generator is 20,
There is no need to maintain the rotational speed of the main shaft drive generator at the minimum operating speed for a certain period of time, and unnecessary navigation of the ship during this period can be eliminated.

〔Effect of the invention〕

As described above, according to the present invention, when power is supplied inside the ship by a main shaft drive generator connected to the main engine, when the drive of the main engine is stopped or its driving force is reduced, , until the power supply is switched to the diesel generator, the rotation speed of the main shaft drive generator is
The main shaft drive generator can supply the necessary power to the load on the ship without having to maintain the rotation speed at the minimum operating speed, and in order to supply power to the load, the ship will not be able to sail unnecessarily or stop suddenly. This provides an excellent industrial effect that prevents collisions and the like from occurring due to delays.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an embodiment of this invention, Fig. 2 is a principle diagram of this invention, Fig. 3 is a system diagram showing an example of a conventional method, and Fig. 4 is an operating characteristic of a main shaft drive generator. The graph shown in Figure 5 shows the rotational speed of the main engine. In the drawings, 1... Main engine, 2... Main shaft drive generator,
3...Propeller, 4...Thyristor converter, 5...Thyristor inverter, 6...Gray car, 7...Ki, s...
Diesel Enson, 9...Diesel Generator,
10...Gray car, 11...Rotary synchronous phase modifier, 12...Telegraph, 13...Speed regulator, 1
4...Flywheel, 15...Automatic synchronization input device.

Claims (1)

[Claims] It is equipped with a thyristor inverter type main shaft drive generator driven by the main engine and a diesel generator, and while the main engine is driven at a normal rotation speed, the main shaft drive generator In the power supply method using a thyristor inverter type main shaft drive generator, which supplies power to an onboard load and switches the power supply to the onboard load to the diesel generator when the drive of the main engine is stopped or its rotation speed decreases, A part of the electric power generated by the main shaft drive generator is
Driving the diesel generator based on a command that is accumulated by a rotary synchronous phase adjuster having a flywheel connected to the main shaft drive generator and stops driving the main engine or reduces the rotational speed, The speed of the rotary synchronous phase modifier is increased, the diesel generator is synchronously turned on, and the inertia of the flywheel provided in the rotary synchronous phase modifier is used to generate the required power. A power supply method using a thyristor inverter-type main shaft drive generator, which is characterized by supplying power to loads onboard.