JPH078678B2 - Electric propulsion ship with computing device for propulsion load estimation - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric propulsion ship equipped with an electric propulsion device, and more particularly to an electric propulsion device equipped with an arithmetic unit capable of estimating a propulsion load in the electric propulsion device. Regarding the propulsion ship.

[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 response to a propulsion load in the electric propulsion device.
The load controller controls the amount of power generation and the like.

In addition to the above electric propulsion device, a large number of electric devices may be provided in the ship. Therefore, power supply corresponding to the onboard electric load of each device may be performed by the generator, or a plurality of generators may be provided in addition to the generator. When a plurality of generators are provided in this way, an operating number control device for controlling the number of operating generators according to the propulsion load and the electric load on board is provided.

In the above electric propulsion ship, when the speed of the ship is changed and controlled, a control signal for changing the speed of the ship is sent from the cockpit to the electric propulsion device. Then, the electric propulsion device is operated based on the control signal, and change control to a predetermined boat speed is performed.

[Problems to be solved by the invention]

By the way, in such an electric propulsion ship, for example, when the speed of the electric propulsion device is increased, the propulsion load in the electric propulsion device increases, so that the amount of electric power supplied from the generator to the electric propulsion device increases. Therefore, it is necessary to control the generator by the load control device.

However, in the conventional electric propulsion ship, the control of the generator as described above is performed after the propulsion load in the electric propulsion device is actually detected, and therefore, before the electric power of the generator increases, If the electric power cannot be smoothly supplied and the electric power is insufficient, the operation of not only the electric propulsion device but also the electric devices onboard the ship may be hindered.

Further, when the electric propulsion device is decelerated, it is necessary to reduce the amount of electric power of the generator. In this case, the above-mentioned shortage of electric power does not occur, but surplus electric power will be generated until the electric power of the generator decreases,
It is not preferable from the viewpoint of energy saving and economical efficiency.

The present invention is intended to solve these problems by estimating the propulsion load associated with the ship speed change control, and based on the estimated propulsion load, the load control of the generator almost simultaneously with the ship speed change control. It is intended to provide an electric propulsion ship with a propulsion load estimation computing device, which enables the propulsion device to operate without any hindrance and enables economical operation.

[Means for solving problems]

Therefore, the electric propulsion ship with the propulsion load estimation computing device of the present invention can supply power to the electric propulsion device equipped on the ship and the electric propulsion device corresponding to the propulsion load in the electric propulsion device. In an electric propulsion ship equipped with a generator and a load control device for the generator, an arithmetic device for supplying an estimated propulsion load signal corresponding to the instructed ship speed to the load control device is provided. It is characterized by comprising a storage unit for storing a relational expression between the speed and the propulsion load, and a calculation unit for substituting the instructed ship speed into the relational expression to estimate the propulsion load.

[Action]

In the above-described electric propulsion ship with a computing device for propulsion load estimation of the present invention, the instruction ship speed is input to the arithmetic device during the change control of the ship speed, and the instruction ship speed is stored in the storage unit in the arithmetic unit of the arithmetic device. Substituted in the relational expression stored in, the propulsive load is calculated and estimated.

Then, the estimated propulsion load signal corresponding to the calculated instructed ship speed is output from the arithmetic unit to the load control device of the generator, and the load control unit causes the power supply amount from the generator to the electric propulsion device. Is controlled.

〔Example〕

An electric propulsion ship with a propulsion load estimating computer according to an embodiment of the present invention will be described below with reference to the drawings.
The figure is a schematic diagram showing the overall configuration, and FIG. 2 is a graph showing the relationship between the ship speed notch position as the instructed ship speed and the propulsive load electric power (or current).

As shown in FIG. 1, an electric propulsion ship according to the present embodiment is equipped with an electric propulsion device. This electric propulsion device includes a propeller 1 and a plurality of propellers 1 for driving the propeller 1. It is composed of a propulsion electric motor (M ₁ , ..., Mm) 3 and a reduction gear (or constant speed gear) 2.

The propeller 1 and the reduction gear 2 are connected by a propeller shaft 9, while a clutch 10 is interposed between the reduction gear 2 and each electric motor 3. Each electric motor 3 is connected to the bus bar 4 by an electric wire 11 having a protective device (circuit breaker) 12 interposed therebetween.

On the other hand, the busbar 4 has a plurality of generators (G ₁ , G ₂ , ..., Gn) 5
, Each of which has a protective device (circuit breaker) 14
Connected by 13. These generators 5 are connected to a load control device (or operating number control device) 6, and the load control device 6 controls the output of the generator 5.

In addition, various electric devices (Z ₁ , Z ₂ , ..., Zl) 7 as inboard loads are provided in the ship, and these electric devices 7 also have a protective device (circuit breaker) 16. Intervening wire
It is connected to the bus bar 4 by 15.

Further, the reduction gear 2 and the clutch 10 in the electric propulsion device
The electric motor 3 is connected to the ship speed handle 19 in the cockpit, and is controlled based on a command ship speed signal (in this embodiment, the ship speed notch position of the ship speed handle 19) Hv from the ship speed handle 19. It is like this.

By the way, the indicated boat speed signal Hv from the above boat speed handle 19
Is input to the electric propulsion device and, at the same time, the arithmetic unit 18
Is input to. In addition, the load detector 17 is attached to each wire 15.
Is attached, the load power (or current) of the electric device 7 is detected by the load detector 17, and the detection signal Psk (k = 1, 2, ..., L) is also input to the arithmetic unit 18. .

The arithmetic unit 18 includes an arithmetic unit 8 and a storage unit 20. The storage unit 20 stores the ship speed (the ship speed notch position) and the propulsive load power (or current) as a propulsive load when the ship is in a straight-ahead straight traveling state. The relational expression with and is preset and stored.

Further, in the calculation unit 8, the instructed boat speed signal Hv input from the boat speed handle 19 is substituted into the relational expression called from the storage unit 20, and the propulsive load power is estimated and calculated. Then, the detection signal Psk (k = 1,2, ..., l) from the load detector 17
And the estimated propulsive load power signal Pym are obtained, and the sum is output to the load control device (or operating number control device) 6 of the generator 5 as the estimated total load power (or current) signal Pyg, and the above signal is output. The output of the generator 5 is controlled by the load control device 6 based on Pyg.

Since the electric propulsion ship with the propulsion load estimation computing device as one embodiment of the present invention is configured as described above, when the ship speed handle 19 is operated in order to change the ship speed,
The instruction ship speed signal Hv is output to the electric propulsion device and at the same time to the arithmetic device 18.

Then, in the calculation unit 8 of the calculation device 18, the instruction ship speed signal
Hv is a relational expression [Pym =
f (Hv)], and the estimated propulsive load power signal Pym corresponding to the steady straight traveling of the ship is calculated. Here, the relational expression f (Hv) is generally as follows.

Pym = f (Hv) = A · | Hv | ^x + C (1) However, x is a power of about 1 to 4, A and C are arbitrary constants, and the indicated ship speed signal Hv is positive in the forward direction. , Reverse direction is negative. Further, its schematic characteristics are shown in FIG.

On the other hand, the load power (or current) of the electric device 7 as the inboard load is detected by the load detector 17,
The load power signal Psk (k = 1, 2, ..., L) is input to the arithmetic unit 18. Then, the calculation unit 8 obtains the inboard load power (or current) signal Ps as follows.

Here, 1 is the total number of electric devices 7 in the ship.

Further, in the calculation unit 8, the sum of the estimated propulsive load power signal Pym and the inboard load power signal Ps obtained by the equations (1) and (2) is obtained, and the sum is calculated as the estimated total load power (or current). ) Generator 5 as signal Pyg (= Pym + Ps)
Is output to the load control device (or the operating number control device) 6.

Then, the load control device 6 controls the load of the generator 5 based on the estimated total load power signal Pyg so as to generate the amount of power corresponding to the load power signal Pyg. Also,
When a plurality of generators 5 are provided, the operating quantity control device may control the number of generators 5 to adjust the amount of electric power.

When the electric device 7 as the inboard load cannot be provided or when the electric device 7 is supplied with electric power from a generator different from the electric propulsion device, the calculation unit 8 of the calculation device 18 uses (1 Only the estimated propulsive load power signal Pym based on the equation) is calculated, and the signal Pym is input to the load control device (or the operating number control device) 6.

Further, in this embodiment, the propeller 1 is used as an electric propulsion device.
The present invention is also applied to an electric propulsion ship in which a superconducting magnet or the like is used to accelerate external water by electromagnetic induction to obtain propulsive force in the same manner as described above. it can.

As described above, according to the present embodiment, when the control for changing the ship speed is performed, at the same time as the change control, in the arithmetic unit 18, the estimated propulsive load power signal Py corresponding to the instructed ship speed signal Hv.
m is estimated and calculated.

Since the load control of the generator 5 is performed based on the estimated total load power signal Pyg obtained from the sum of this signal Pym and the other inboard load power signal Ps, not only the electric propulsion device but also the electricity onboard the ship The required amount of power is constantly supplied to the formula device 7 in almost real time.

Therefore, for example, during speed-up control, the amount of power supplied from the generator 5 increases in accordance with the speed-up amount, so that the electric propulsion device operates without any trouble, and during deceleration control, power generation according to the speed-down amount. Since the amount of power supplied from the aircraft 5 is reduced, surplus power is not generated and economical operation can be performed.

In particular, when there are a large number of generators 5, each load should be shared at a load factor that maximizes generator engine efficiency.
By optimizing the number of operating vehicles, more economical operation can be achieved.

〔The invention's effect〕

As described above in detail, according to the electric propulsion ship with the propulsion load estimating operation device of the present invention, the electric propulsion device mounted on the ship and the electric propulsion device corresponding to the propulsion load in the electric propulsion device are provided. In an electric propulsion ship equipped with a generator capable of supplying power to the propulsion device and a load control device for the generator, an arithmetic device is provided for supplying the load control device with an estimated propulsive load force signal corresponding to the commanded ship speed. Since the arithmetic unit is configured to include a storage unit that stores the relational expression between the ship speed and the propulsion load and a calculation unit that substitutes the instructed ship speed into the relational expression to estimate the propulsion load, The propulsion load is estimated when changing the ship speed, the generator load is controlled based on the propulsion load, and the amount of power supplied to the electric propulsion device is finely controlled, which is economical and does not hinder the electric propulsion device. Can be activated to That.

[Brief description of drawings]

FIGS. 1 and 2 show an electric propulsion ship with a propulsion load estimation computing device as an embodiment of the present invention. FIG. 1 is a schematic diagram showing the overall structure of the electric propulsion ship, and FIG. It is a graph which shows the relationship between a ship speed notch position and propulsion load electric power (or electric current). 1 ... propeller, 2 ... reduction gear (or constant velocity gear),
3 ... Propulsion motor (M ₁ , ..., Mm), 4 ... Bus, 5 ...
Generators (G ₁ , G ₂ , ..., Gn), 6 ... load control device (or operating number control device), 7 ... electrical equipment (Z ₁ , Z ₂ , ..., Zl) as inboard load, 8 ... Computing unit, 9 ... Propeller shaft, 10 ... Clutch, 11 ... Electric wire, 12 ... Protective device (circuit breaker), 13 ... Electric wire, 14 ... Protective device (circuit breaker),
15 …… electric wire, 16 …… protective device (circuit breaker), 17 …… load detector, 18 …… computing device, 19 …… ship speed handle, 20 …… storage unit.

Claims (1)

[Claims] 1. An electric propulsion device mounted on a ship, a generator capable of supplying power to the electric propulsion device in response to a propulsion load in the electric propulsion device, and a load control device for the electric propulsion device. The provided electric propulsion ship is provided with an arithmetic unit for supplying an estimated propulsion load signal corresponding to the instructed ship speed to the load control device, and the arithmetic unit stores a relational expression between the ship speed and the propulsion load. An electric propulsion ship with a propulsion load estimating arithmetic unit, comprising: and a computing unit for substituting the indicated ship speed into the above relational expression to estimate the propulsion load.