JPS592114A - Electric power supply device for ship - Google Patents

Abstract

PURPOSE:To obtain an electric power supply device for a ship at a low cost, by using an electric power converting device containing a converter, an invertor, etc. as a shaft generating device for supplying electric power to an inboard bus during the voyage, and using it as a variable driving electric power source of a loading and unloading pump, etc. during the anchoring. CONSTITUTION:When a ship leaves a port and can use a shaft generating device, breakers 18, 19 are turned on and off, respectively, AC power is obtained from a shaft generator 3, and an electric power converting device 30 mainly consisting of a converter and an invertor 6 is started. Subsequently, it is turned on synchronously to a bus 10a by a breaker 14, a breaker 13 is turned off by shifting a load from a Diesel engine generating device 12, and electric power is supplied to an inboard load 11 of a constant frequency bus 10a during the voyage. When the ship enters preparations for arriving in a port, the generating device 12 is started, the breakers 13, 14 are turned on and off, respectively, and the shift generating device is stopped. In case when the electric power converting device 30 is operated as an electric power source for driving a variable speed, the breakers 19, 18 are turned off and on, respectively, the converting device 30 is started by obtaining AC power from the bus 10a, and a variable frequency output is supplied to a variable frequency bus 10b and is outputted to a load 22.

Description

[Detailed description of the invention] The present invention relates to an improvement C of a power supply device for a ship.

In recent years, there has been a tendency for the cost of generating power on board a ship to rise62 due to the rise in oil prices6, and shaft power generators are attracting attention as one of the countermeasures. This is an attempt to generate electricity using the power of the ship's main propulsion engine to obtain onboard power at a lower cost.

Various systems have been proposed for the axis generator, but one of the representative systems is the thyristor inverter type axis generator.
Figures 1 and 12 show examples of hinoki hinoki wood production. In FIG. 1, 1 is a main engine such as a diesel engine that drives a propulsion propeller 2, and a shaft generator that generates alternating current power with a variable frequency to be supplied to a 3t-t converter 4.

Electric power #'i converted to DC by the converter 4 is smoothed by the DC reactor 5, and then supplied to the inverter 6, where it is converted to AC power at a single frequency and supplied to the inboard bus IO. A synchronous harmonic machine for generating 8Fi reactive power.
The operation number of the inverter 6 and the onboard power supply 11, which are separately excited for commercial reasons, supplies the necessary reactive power.

7 AC reactor for suppressing harmonic frost generated by the inverter 6, voltage waveform distortion of the inboard mother m n+ due to current, 9 IrJ: Control of converter/inverter l
1 device.

Note that %12 is diesel engine 12α and AC power generation m1
It is a diesel power generator consisting of 2J, and mainly supplies f2 power to the ship's bus bar while the ship is at berth. Also 13.14
．． This is an automatic voltage regulator that controls the voltages of the 15-15 shaft generator, the 16-17 Vi shaft generator, and the synchronous harmonizer. Although it is a thing.

Since the ship uses the shaft as its source of electricity, there is no facility utilization value when the ship is at anchor. That is, (1) the main engine is stopped and cannot be used while the ship is at anchor.

(2) In order to operate and inspect the shaft generator while at berth, special additional equipment is required.

On the other hand, the vessel 52 has equipment that is operated only while at anchor.

An example is a cargo pump for a tanker. Increasingly, cargo handling pumps and the like are required to be electrically powered, and in this case, variable speed drive is usually required for cargo handling reasons or for the purpose of saving energy. Conventionally, thyristor Leonard control of a DC motor has been used for these purposes, and recently, the use of primary frequency control of a visiting motor using an inverter is being considered.

Although these devices are functionally sufficient, they are insufficient in that they are only used for guard duty while a ship is at anchor, and become idle equipment during the voyage. C
This was done based on two points of view, and its purpose is to provide a W5 equipment for ships that can improve the operating WJ rate of the equipment and can be used comprehensively and effectively. A marine power supply system that can be used as a shaft power generator to supply low-cost power to the ship's bus bar while the ship is at sea, and as a dedicated power source for variable linkage operations such as the utility pump while at anchor. That is.

Specific examples of the present invention will be described below.

An embodiment of the present invention is shown in FIG.
10b is a constant frequency bus that supplies power to general onboard loads, etc., and 10b is a variable frequency bus that supplies variable speed dynamic load 22C via a circuit breaker 21.
0α, 104 is selected by circuit breakers 4 and 20, and the output of the inverter 6 is supplied with power.

On the other hand, on the input side of the converter 4, the shaft generator 3 or the constant frequency bus 10α is selected by circuit breakers 18 and 19 to receive power. Note that this is an AC reactor for suppressing voltage waveform distortion of the constant frequency bus 10tz due to the #l harmonic current generated by the 23Vi converter 4. A group of devices including the converter 4, the DC reactor 5, the inverter 6, the AC reactor 7, the synchronous harmonic machine 8, and the control device 9 will be referred to as a power conversion device 30.

Other parts are the same as those with the same reference numerals in FIG. 1, and their explanation will be omitted.

Next, the operation of the marine power supply device according to the embodiment shown in FIG. 2 will be specifically described.

When the ship leaves the port and the condition is such that the shaft generator can be used, the circuit breaker 18 is closed 1' and 19 is opened, AC power is obtained from the shaft generator 3, and power conversion is performed mainly using the converter 4 and inverter 6. Start the device 30.

After the start is completed, the bus 10aC is synchronously turned on using the circuit breaker 14, and the load is transferred from the diesel generator 12, and then the C2 lotus circuit breaker 1
3 is operated as an open-shaft power generator to supply low-cost power to the onboard load 11 on the constant frequency bus 10a for most of the ship's voyage.

When the ship is ready to enter the port, the diesel generator 12 is started, the load is transferred to the bus bar at the bell 13, the load is transferred from the shaft generator, and then the second circuit breaker 14 is turned to stop the shaft generator. . From then on, onboard power will be supplied by a diesel generator when entering port and at berthing.

Next, a description will be given of the operation when the power conversion device 30 is operated as an 11 source for variable speed drive under condition C2, that is, when a cargo handling pump is operated on a tanker or the like. In this case, the constant frequency bus 10α is supplied with power from the diesel engine generator [12]. The power converter 30 is started by obtaining alternating current power from the constant frequency bus 10a with the circuit breaker 9 closed 1' and the circuit breaker 18 opened 1'.

Under the condition that the frequency fm and voltage v1 suitable for starting the town variable speed drive negative #22 are obtained at the output of the power converter 30, the circuit breaker 20 is closed to 1' and the output of the power converter 30 is connected to the variable frequency bus lOk. supply to. Circuit breaker 21 is then closed and load 22 is started. When the load 22 is a squirrel cage induction motor, it is generally started at a low frequency, and the speed is generally controlled by keeping the ratio of the frequency to the voltage (V/F ratio) at -1.

After the power converter 30 is started, the output frequency and output voltage of the power converter 30 are controlled based on the operating condition C of the load 22, and the rotational speed of the load is controlled according to the target value. In this state, the power conversion device 3o operates as a variable voltage and variable frequency power supply device. The frequency control operation of the power converter [30 is basically the same as that of the shaft power generator, and is performed by controlling the thick peak of the DC power supplied from the converter 4 to the converter 6. tl, negative #J2 converted to AC power (active power) by inverter 6
2 and the loss power of the synchronous phase modifier 8 are supplied. Therefore, if the power generated by the inverter 60 is increased by gate control of the converter 4, the output frequency will increase.
On the other hand, if you decrease it, it will go down.

On the other hand, the voltage side g41 of the power converter 30 is connected to the synchronous phase modifier 8
This is done by an automatic voltage regulator 17. automatic voltage regulator 1
The characteristic of 7 is the v/F ratio-foot side control characteristic mentioned above.
This controls the output voltage. This is important to prevent magnetic saturation of the iron core of load 22.

Automatic voltage t11 of synchronous phase modulator 8! An example of the characteristics of the l regulator 17 is shown in Figure 3 ((1), (J) l2. m3 figure (') U
When the shaft is operated as a device, (4) is an example of the case where it is operated as a variable speed drive source device.

FIG. 3 (α) 6 C2 control is performed to maintain the voltage of the synchronous phase adjuster 8 at the short circuit voltage vn around the rated frequency In with the normal variable voltage vI4 rectifier 0 characteristic.

On the other hand, FIG. 3 (4) shows 1. This is an automatic voltage regulator characteristic that has voltage frequency characteristics to realize performance as a power source, and is called a V/F-leg side control 1% characteristic. This can be realized by determining the reference voltage of the automatic voltage IJj4Ii device depending on the output frequency. In this case, the rating is 1. The voltage vn is obtained at the rated frequency jnt2, and as the output frequency decreases, the output voltage l2 also decreases. At extremely low frequencies, it is common to control the V/F ratio to be slightly larger in order to compensate for the leakage impedance on the primary side of the load motor.

As mentioned above, the failure F! By using different power converters, Al Niyore not only provides low-cost power while the ship is sailing, but also allows the variable speed of the onboard load even when the ship is at anchor, which was previously not possible. Utilizing it for driving provides 5J capacity. This is not just about effective utilization of equipment, but also the energy saving effect (so-called energy saving effect) in ship systems.
It is extremely effective in saving resources and making effective use of space inside the ship.

As described above, the present invention is effective in the development of power supply devices for ships, and has great value in the development of industrial technology.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a conventional marine power supply device. Figure 2 is a system diagram showing an embodiment of the power source device for ships of the present invention, and Figure 3 (1) and (4) are characteristic diagrams of the synchronous harmonic type automatic voltage 11 rectifier shown in Figure 2. Figure 3 (α) shows the case when operating as an axis-driven 1. device, and Figure 3 (4) shows the case when operating as a power conversion device for variable speed drive. 1... For propulsion. Main engine 3...shaft generator 10a...
・Short frequency bus for use...Variable frequency bus 12...
Diesel power generators 13, 14.1 which are other power generators
5.18.19.20.21...Creator 22...Variable speed drive load 30...Power conversion agent Patent attorney Inoue -Male

Claims (1)

[Claims] In a marine power supply system using a power converter whose input is selectively connected to either a shaft generator driven by the main propulsion engine or a constant frequency bus to which other power generating equipment is connected. , IP4 indicates that a circuit breaker is installed so that the output of the power converter can be selectively supplied to the constant frequency bus and the variable frequency bus to which the variable speed drive load is connected. Marine power supply.