JP3675186B2 - Control method of electric propulsion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for controlling a marine electric propulsion device.
[0002]
[Prior art]
FIG. 2 is a circuit configuration diagram showing a conventional example of this type of electric propulsion apparatus control method.
In FIG. 2, 1 is a prime mover such as a diesel engine, 2 is a generator using the prime mover 1 as a drive source, 3 is a motor, 4 is a propeller driven by the motor 3, and 5 is a speed detection for detecting the rotational speed of the motor 3. , 6 is a power converter that converts electric power of the generator 2 into electric power necessary for controlling the electric motor 3, and 7 detects, for example, an electric current of the electric motor 3, and detects a generated torque of the electric motor 3 from this electric current. A torque detector 11 is a speed setter for setting the rotation speed of the electric motor 3, and 12 is an adjustment calculation of a deviation between the speed set value of the speed setter 11 and the detected value of the speed detector 5. The speed controller 13 outputs the torque set value as a torque adjustment value, and adjusts and calculates the deviation between the torque set value and the detected value of the torque detector 7 and turns on each of the semiconductor switches constituting the power converter 6 based on the calculated value.・ Off A power converter control circuit for regulating the power supplied to the electric motor 3 to the desired value by Rukoto.
[0003]
[Problems to be solved by the invention]
In the control method of the electric propulsion apparatus shown in FIG. 2, for example, when the load torque of the propeller 4 increases rapidly, the rotation speed of the motor 3 also decreases rapidly, and the electric motor that is the output of the speed regulator 12 to correct this rapid decrease in rotation speed. The torque setting value of 3 also increases rapidly. As a result, the input and output power of the power converter 6 increase rapidly, and this sudden increase in input power may cause an abnormal stop of the prime mover 1, and the output frequency and voltage of the generator 2 may be disturbed. There was a problem of adversely affecting equipment including the power converter 6 connected to the illustrated inboard power system.
[0004]
An object of the present invention is to provide a method for controlling an electric propulsion device that solves the above-described problems.
[0005]
[Means for Solving the Problems]
The present invention relates to a method for controlling an electric propulsion device for a ship, which includes at least a propeller and an electric motor that drives the propeller.
A value obtained by adjusting and calculating a deviation between the speed setting value of the motor set from the outside and the speed detection value of the motor is limited to a torque limit value, and the limited value is set as the torque setting value of the motor. When controlling the electric motor based on a set value, a value obtained by multiplying the value obtained by multiplying the torque set value and the detected speed value by an allowable power increase amount is updated and held every predetermined time. A value obtained by dividing the held value by the speed detection value is used as the torque limit value.
[0006]
According to this invention, by controlling the electric motor at a torque limit value or less derived from a value based on the power increase amount allowable value, the fluctuations of the motor and the generator driven by the motor are reduced to the allowable value or less. be able to.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a circuit configuration diagram showing an embodiment of a control method for an electric propulsion apparatus according to the present invention. Components having the same functions as those in the conventional circuit shown in FIG. Omitted.
That is, in FIG. 1, a multiplication operation unit 21 multiplies a torque set value, which is an output of a speed regulator 25 described later, and a detection value of the speed detector 5 and outputs the multiplication value as an actual power value of the motor 3. , 22 is an addition computing unit that adds a preset power increase amount allowable value (for example, about 20% of the rated power of the generator 2) to the actual power value, and 23 is a value obtained by adding the addition value of the addition computing unit 22 to a predetermined value. A sample and hold circuit that samples every time (for example, every 10 seconds), holds and outputs this value, and 24 divides the output value of the sample and hold circuit 23 by the detection value of the speed detector 5, and this division A division calculator 25 that outputs a value as a torque limit value of the motor 3 adjusts and calculates a deviation between the speed setting value and the detection value of the speed detector 5, and the obtained adjustment calculation value exceeds the torque limit value. When you are Outputs click limit value as the torque setpoint of the motor 3 and, when the adjusting operation values obtained below the torque limit value is a speed regulator for outputting said modulation operation value as the torque setpoint of the motor 3.
[0008]
In the circuit configuration shown in FIG. 1, in the steady state, the rotational speed of the motor 3 is substantially equal to the speed set value of the speed setter 11, and as a result, the adjustment calculation value in the speed adjuster 25 is within the torque limit value. It is in the state.
At this time, for example, when the load torque of the propeller 4 rapidly increases, the speed regulator 25 causes the electric motor 3 to generate an acceleration torque so as to maintain the speed set value. As a result, the adjustment calculation value exceeds the torque limit value, The output of the speed regulator 25 outputs the torque limit value as a torque set value.
[0009]
At this time, by setting the power increase allowable value to about 20% of the rated power of the generator 2 as described above, the fluctuations of the prime mover 1 and the generator 2 driven by the prime mover 1 are made less than the allowable value. Can do. Note that, by setting the sample period of the sample and hold circuit 23 to about 10 seconds as described above, the settling time of the adjustment operation in the speed regulator 25 can be matched.
[0010]
【The invention's effect】
According to the present invention, by controlling the electric motor for propelling the propeller below the torque limit value derived from the value based on the power increase allowable value, fluctuations in the motor and the generator driven by the motor are below the allowable value. Can be.
[Brief description of the drawings]
FIG. 1 is a circuit configuration diagram showing an embodiment of a control method for an electric propulsion device according to the present invention. FIG. 2 is a circuit configuration diagram showing a control method for a conventional electric propulsion device.
DESCRIPTION OF SYMBOLS 1 ... Motor | power_engine, 2 ... Generator, 3 ... Electric motor, 4 ... Propeller, 5 ... Speed detector, 6 ... Power converter, 7 ... Torque detector, 11 ... Speed setter, 12 ... Speed regulator, 13 ... Electric power Converter control circuit, 21... Multiplication operation unit, 22... Addition operation unit, 23... Sample and hold circuit, 24.

Claims (1)

In a method for controlling a marine electric propulsion device including at least a propeller and an electric motor that drives the propeller,
A value obtained by adjusting and calculating a deviation between the speed setting value of the motor set from the outside and the speed detection value of the motor is limited to a torque limit value, and the limited value is set as the torque setting value of the motor. When controlling the electric motor based on the set value,
A value obtained by adding a power increase amount allowable value to a value obtained by multiplying the torque setting value by the speed detection value is updated and held every predetermined time,
A control method for an electric propulsion apparatus, wherein a value obtained by dividing the held value by the speed detection value is used as the torque limit value.

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