JPS6313893A - Electrically propelled ship with propelling load estimating arithmetic unit - Google Patents

Abstract

PURPOSE:To carry out the smooth and economical operation of a propelling device by providing an arithmetic unit for feeding an estimated propelling load signal corresponding to the indicated propeller rotating speed to a load control device, and estimating a propelling load at the time of the varying control of the propeller rotating speed and carrying out the control of the load of a generator. CONSTITUTION:An indicated propeller rotating speed signal Nv from a ship speed handle 19 is inputted into an electric propelling device while also into an arithmetic unit 18. And, a load power to electric equipment 7 is detected by a detector 17 and the signal Psk is also inputted into the arithmetic unit 18. An arithmetic part 8 substitutes the indicated propeller rotating speed Nv for a relation expression read from a memory part 20 in which the relation expression between a propeller rotating speed and a propelling load power at the time of steady-state straight advancing navigation is previously set, to estimatingly operate a propelling load power. And, the sum of this signal and the detected signal Psk is outputted to a load control device 6 as an estimated total load power signal Pyg, to control the output of a generator 5. Accordingly, the power feeding quantity to a propelling device can be carefully controlled, economically operating the propelling device without hindrance.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric propulsion ship equipped with an electric propulsion device, and particularly relates to an electric propulsion ship equipped with an electric propulsion device, and in particular, to an electric propulsion ship equipped with an electric propulsion device. Regarding electric propulsion ships equipped with

[Conventional technology]

Generally, an electric propulsion ship is equipped with an electric propulsion device, and a generator is connected to the electric propulsion device.

This generator supplies power to the electric propulsion device in accordance with the propulsion load on the electric propulsion device,
The amount of power generated, etc. is controlled by the load control device.

Note that a ship may be equipped with a large number of electric devices in addition to the electric propulsion device described above. Therefore, the power supply corresponding to the onboard electrical load of each device may be performed by the above-mentioned generator, or a plurality of generators other than the above-mentioned generator may be provided.

In the case of having multiple generators in this way, a device for controlling the number of generators in operation is provided to control the number of generators in operation according to the above-mentioned propulsion load and onboard electrical load. When changing and controlling the propeller rotation speed, a control signal for changing the propeller rotation speed is sent from the cockpit to the electric propulsion system. Then, based on the control signal, the electric propulsion device is operated, and the propeller rotation speed is controlled to be changed to a predetermined propeller rotation speed.

[Problem that the invention seeks to solve]

By the way, in such an electric propulsion ship, for example, if the propeller rotation speed of the electric propulsion device is increased, the propulsion load on the electric propulsion device increases, so the amount of power supplied from the generator to the electric propulsion device increases. In order to increase this, it is necessary to control the generator with a load control device.

However, on electric propulsion ships based in the United States, the above-mentioned control of the start time is performed after actually detecting the propulsion load in the electric propulsion system, so the start-up time is not controlled until the power amount of the generator increases. In addition, smooth power supply may not be possible, and the lack of power may cause problems not only in the electric propulsion system but also in the operation of electrical equipment inside the ship.

Furthermore, when the propeller rotation speed of the electric propulsion device is reduced, it is necessary to reduce the amount of electric power of the generator. In this case, there will not be a shortage of electricity as described above, but there will be surplus electricity until the generator's electricity is reduced, which is not good from the point of view of energy saving and yield efficiency. Undesirable.

The present invention aims to solve these problems by estimating the propulsion load associated with the change control of the propeller rotation speed, and based on this estimated propulsion load, the generator is started almost simultaneously with the change control of the propeller rotation speed. By making it possible to control the load,
It is an object of the present invention to provide an electric propulsion ship equipped with a calculation device for estimating a propulsive load, which allows a propulsion device to operate without any trouble and enables economical operation.

[Means for solving problems]

For this reason, the external electric propulsion ship with an arithmetic unit for propulsive load estimation according to the present invention is an electric propulsion ship equipped with a propeller installed on the ship and an electric motor for driving the propeller! In an electric propulsion ship equipped with a generator that supplies power to the electric propulsion device in response to the propulsion load in the electric propulsion device, and a load control device for the generator, A calculation device that supplies an estimated propulsion load signal corresponding to the designated propeller rotation speed is provided, and the calculation device stores a relational expression between the propeller rotation speed and the propulsion load, and a storage unit that stores the relational expression between the propeller rotation speed and the propulsion load, The present invention is characterized in that it includes a calculation unit that estimates the propulsion load by substituting into the calculation unit.

[For production]

In the above-mentioned electric propulsion ship equipped with a calculation device for propulsive load estimation of the present invention, when changing the propeller rotation speed, the commanded propeller rotation speed is input to the calculation device, and the calculation section of the start g device calculates the command propeller rotation speed. , is substituted into the relational expression stored in the storage unit, and the propulsion load is calculated and estimated.

And performance 11. An estimated propulsion load signal corresponding to the instructed propeller rotation speed is output from the calculation device to the load control device of the generator, and the load control device controls the amount of power supplied from the generator to the electric propulsion device. be done.

〔Example〕

Hereinafter, an electric propulsion ship equipped with a calculation device for propulsive load estimation as an embodiment of the present invention will be explained with reference to the drawings.
The figure is a schematic diagram showing the entire vI command, and FIG. 2 is a graph showing the relationship between the designated propeller rotation speed and the propulsion load power (or current).

As shown in FIG. 1, the electric propulsion boat according to this embodiment is equipped with an electric propulsion device, and this electric propulsion device includes a propeller 1 and a plurality of propellers for driving the propeller 1. It is composed of a propulsion electric motor (Ml, . . . , Mi) 3 and a reduction gear (or constant velocity gear) 2.

The propeller 1 and the reduction gear 2 are connected by a propeller shaft 9, and a clutch 10 is interposed between the reduction gear 2 and each electric motor 3. Further, each electric motor 3 has an electric wire 1 interposed with a protective device (breaker) 12.
1 to the bus bar 4.

On the other hand, mother #14 has multiple generators (G + , G 2
1..., Gn) 5 are connected to each other by a wire #a13 having a protective device (breaker) 14 interposed therebetween.

These power generators 8!5 are connected to a load control device (or a device for controlling the number of operating units) 6, and the load control device 6 controls the output of the power generators 8!5.

In addition, there are various electrical equipment (
Z,,Z2. ..., 2J) 7 are provided, and these electric devices 7 are also connected to the motherboard [4] by an electric wire 15 with a protective device RA (breaker) 1G interposed therebetween.

Furthermore, the reduction gear 2° clutch 10 and the electric fi 3 in the electric propulsion system
The propeller rotation speed signal Nv is connected to the boat speed handle 19, and is controlled based on an instruction propeller rotation speed signal Nv from the boat speed handle 19.

Incidentally, the commanded propeller rotation speed signal Nv from the speed handle 19 is input to the arithmetic unit 18 at the same time as being input to the electric propulsion system. *In addition, a load detector 17 is attached to each electric wire 15, and this load detector 1
7, the load power (or current) of the electrical equipment 7 is detected, and the detection signal Psk (k=1, 2...,
1) is also input to the arithmetic unit 18.

This calculation device 18 consists of a calculation section 8 and a storage section 20,
In 4jJ20, a relational expression between the propeller rotation speed during steady straight-ahead navigation of the ship and the propulsion load power (or current) as the propulsion load is preset and stored.

Further, in the calculation section 8, the commanded propeller rotation speed signal Nv inputted from the boat speed handle 19 is substituted into the relational expression called from the storage section 20, and the propulsion load power is estimated and calculated. Then, the detection signal P from the load detector 17
sk (k=1.2..., l) and the estimated propulsion load power signal Pym is calculated, and this sum is used as the estimated total load power (or current) signal pyg by the load control device of the generator 5. (Alternatively, it is outputted to the operating number control device 16, and the output of the generator 5 is controlled by the load control device fi6 based on the signal pyg.

Since the electric propulsion ship equipped with a calculation device for propulsive load estimation as an embodiment of the present invention is configured as described above, it is necessary to perform change control of the propeller rotation speed (with the ship speed handle 19
, the indicated propeller rotation speed signal Nv becomes M
At the same time as the output to the L'yc type propulsion device, the calculation device 1
It is also output to 8.

And the calculation part r! In the calculation unit 8 of 118, the instruction propeller rotation speed signal Nv is stored! Substituted into the relational expression [Pyw=f(Nv)] stored in advance in l520,
An estimated propulsion load power signal Pym corresponding to when the ship is traveling straight ahead is calculated. Here, the above relational expression f(Nv) is generally as follows.

Pym-f(Nv)=A ・1Nvl' 10C...(
1) However, x is a power of about 1 to 4, A and C are arbitrary constants, and the instructed propeller rotation speed signal Nv is positive in the forward direction and negative in the backward direction. Further, its schematic characteristics are shown in FIG.

On the other hand, the load power (or current) of the electrical equipment 7 as the onboard load is detected by the load detector 17, and the load power signal Psk (k= 1, 2, . . . ) is detected by the load detector 17.

As a calculation part r! 118. Then, in the calculation section 8, the inboard load power (or current) signal P
s is calculated as follows.

Ps=ΣPsk...(2) 4,t Here, l is the total number of electrical devices 7 on board.

Furthermore, in the calculation unit 8, the sum of the estimated propulsion load power signal Pym obtained by equations (1) and (2) and the onboard load power signal Ps is obtained, and the sum is calculated as the estimated total load power (or current ) Load control device for generator 5 as signal Pyg (=Pym+Ps)! ! (or the operating number control device) 6.

Then, the load control device 6 receives the propulsion load power signal PF[+
Based on this, the load of the generator 5 is controlled so as to generate the amount of power according to the load power signal pyg. In addition, when a plurality of generators 5 are provided, the number of power generators in operation is controlled by a control device. j! The amount of power may be adjusted by controlling the number of units.

Note that when the electric equipment 7 is not provided as an onboard load or when the electric equipment 7 receives power from a generator different from the electric propulsion system, the calculation unit 8 of the calculation unit 18 calculates (1) ) Only the estimated propulsion load power signal Py- based on the equation is calculated, and the signal Py- is input to the load control device (or the number of operating units control device) 6.

As described above, according to the present embodiment, when the propeller rotation speed change control is performed, at the same time as this change control, the estimated propulsion load power signal Pym corresponding to the instructed propeller rotation speed signal Nv is estimated in the arithmetic unit 18. Calculated.

Based on the estimated total load power signal pyg obtained from the sum of this signal Pym and other onboard load power signals Ps, the load control of the generator 1t1525 is performed. Power is always supplied to the device 7 in the required amount almost in real time.

Therefore, for example, during speed increase control, the amount of power supplied to the generator 5 increases in accordance with the speed increase 1, so the electric propulsion system operates without any problem, and during deceleration control, power is generated in accordance with the amount of deceleration. Since the amount of power supplied from aircraft 5 is reduced, no surplus power is generated, and economical operation can be performed.

In particular, when there are a large number of TFiF915 generators, more economical operation can be achieved by optimizing the number of units in operation so that each unit shares the load at a load factor that maximizes generator engine efficiency. Become.

〔Effect of the invention〕

As described in detail above, according to the electric propulsion ship with a calculation device for propulsive load estimation of the present invention, an electric propulsion device consisting of a propeller installed on the ship and an electric motor for driving the propeller, In an electric propulsion ship that is equipped with a generator that can supply power to the electric propulsion device in response to the propulsion load in the electric propulsion device, and a load control device for the generator, the load control device is provided with a propeller rotation speed that is specified to the load control device. A computing device is provided for providing an estimated propulsion load signal, the computing device comprising:
It is comprised of a storage section that stores the relational expression between the propeller rotation speed and the propulsive load, and a calculation section that estimates the propulsion load by substituting the instructed propeller rotation speed into the above relational expression.
The propulsion load is estimated when changing the propeller rotation speed, and the load on the generator is controlled based on the propulsion load. It can be operated economically.

[Brief explanation of drawings]

Figures 1 and 2 show an electric propulsion ship equipped with a calculation device for propulsive load estimation as an embodiment of the present invention. Figure 1 is a schematic diagram showing its overall configuration, and Figure 2 shows the indicated propeller rotation speed and It is a graph showing the relationship with propulsion load power (or current). 1. Propeller, 2. Reduction gear (or constant velocity gear),
3. Electric propulsion 1ff (M,..., Mm), 4.
・Bus bar, 5... Generator (Gl, G2..., Gn),
6. Load control device (or operation number control device), 7.
・Electrical equipment as onboard loads (Zl, Z2=...,
Zl), 8...Calculation unit, 9...Propeller shaft, 10
...Clutch, 11..Electric wire, 12..Protective device (breaker), 13..Electric wire, 14..Protective device (breaker), 1
5...711#i, 16...Protective device (breaker), 17
...Load detector, 18.. Arithmetic unit, 19.. Ship speed handle, 20.. Storage unit.

Claims (1)

[Claims] An electric propulsion system consisting of a propeller installed on a ship and an electric motor for driving the propeller, a generator capable of supplying power to the electric propulsion system in response to the propulsion load on the electric propulsion system, and In an electric propulsion ship equipped with a load control device for a generator, a calculation device is provided that supplies an estimated propulsion load signal corresponding to the instructed propeller rotation speed to the load control device, and the calculation device A calculation device for estimating a propulsion load, comprising a storage unit that stores a relational expression with respect to the load, and a calculation unit that estimates a propulsion load by substituting the designated propeller rotation speed into the relational expression. electric propulsion boat.