JP2014036496A - Main shaft drive power generator and propulsion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a main shaft drive power generator coupled with the main shaft capable of continuously switching a shaft generator between a shaft-generation mode and an electric propulsion mode.SOLUTION: A shaft generator 5 includes: a second rotation control circuit 15-2 that controls the number of revolutions of the shaft generator 5; and a first rotation control circuit 15-1 that controls the number of revolutions of an asynchronous phase modifier 12, which are connected to each other via an integration setter 15-10. When switching a control unit 15 from a shaft-generation mode to an electric propulsion mode for low speed navigation, the integration setter 15-10 inputs the output from the first rotation control circuit 15-1 into an integral element of the second rotation control circuit 15-2 until immediately before the switching, and immediately after the switching, controls the number of revolutions of the shaft generator 5 to start from an initial value. When switching from the electric propulsion mode to the shaft-generation mode, the integration setter 15-10 inputs the output from the second rotation control circuit 15-2 to the integral element of the first rotation control circuit 15-1 as an initial value immediately before the switching; and immediately after the switching, controls the number of revolutions of the synchronous phase modifier 12 to start from the initial value to avoid to change sharply the output current command value.

Description

  The present invention relates to a main shaft drive generator-motor apparatus and propulsion apparatus that can be driven by a shaft generator connected to the main shaft in addition to the case where the propeller for ship propulsion is driven by the main device via the main shaft. is there.

  A main engine such as a diesel engine is connected to a main shaft of a propeller for propulsion that propels the ship through a clutch, and the ship is normally driven by driving the main engine. In addition, a shaft generator (synchronous machine) is connected to the main shaft, and this shaft generator normally generates power by driving the main shaft, and the generated power is frequency-converted by a power converter having a converter and an inverter. The power is converted and supplied to the inboard bus.

  Among ships, for example, as described in Patent Document 1, navigation at the time of observation survey on an observation ship (ocean research ship) or navigation at leisure tour on a leisure ship, etc. Different, low noise, low vibration, low speed navigation may be required.

  In such a case, as described in Patent Document 1, it is conceivable that an electric motor is provided separately from the main engine, and this electric motor is driven by the electric power supplied via the inboard bus for low speed navigation. However, it is necessary to install an electric motor separately from the shaft generator, and there is a problem that the facilities increase.

  Moreover, as described in Patent Documents 2 and 3, the power supplied via the inboard bus is frequency-converted by a converter and an inverter power converter, and the shaft generator is operated as a synchronous motor by this power. It is considered that the main shaft is driven to perform emergency low-speed navigation when the main engine breaks down and low-speed navigation during surveys such as marine research ships, but when the shaft generator is operated as a synchronous motor and shaft power generation When operating as a machine, the method of controlling the power converter, in particular, the current command value of the power converter is completely different, so it is necessary to stop the control before switching, and thereby the control device of the power converter There is a problem that a period during which the boat cannot be operated occurs when switching.

JP-A-8-230785 Japanese Patent Laid-Open No. 5-139391 Japanese Examined Patent Publication No. 63-66719

  Particularly in an ocean research ship or the like, since it is necessary to accurately operate the position of the ship, it is not preferable that a period during which the ship cannot be operated occurs when switching from shaft power generation to electric propulsion or from electric propulsion to shaft power generation.

  The present invention has been made to solve the above-described problems, and the object of the present invention is to change the operation of a shaft generator connected to a main shaft from shaft power generation to electric propulsion or electric propulsion. It is an object of the present invention to provide a main shaft drive generator-motor apparatus and propulsion apparatus that can be continuously switched from power use to shaft power generation.

In order to achieve the above object, a main shaft drive generator-motor apparatus and propulsion apparatus according to the present invention includes a main engine, a ship propeller and a shaft generator connected to the main engine via a clutch, and a thyristor. A power converter that converts the current into direct current and then converts into alternating current, a current detector that detects a current in a direct current portion of the power converter, a synchronous phase adjuster that supplies reactive power to the power converter and the inboard bus, A control device that controls the power converter based on a detected value of the rotational speed of the synchronous phase adjuster and the shaft generator, a first rotational speed setter that sets a rotational command value of the synchronous phase adjuster, A second rotational speed setting device for setting the rotational speed command value of the shaft generator;
The control device outputs a current command value of the DC section of the power converter by PI control so that the rotation speed command value of the first rotation speed setting device matches the rotation speed of the synchronous phase adjuster. And a second rotation that outputs the DC portion of the power converter by PI control so that the rotation speed command value of the second rotation speed setting device matches the rotation speed of the shaft generator. A first changeover switch for selecting whether the current command value of the direct current section of the power converter is an output of the first rotational speed control circuit or an output of the second rotational speed control circuit; A current control circuit that outputs a phase control signal so that a current flowing through a DC portion of the power converter matches the current command value; and a first PLL circuit that generates a synchronization signal from a voltage on the AC side of the power converter And generating a synchronization signal from the armature voltage of the shaft generator And calculating a thyristor firing angle of the power converter based on a second PLL circuit, a phase control signal of the current control circuit, and a synchronization signal generated by the first PLL circuit, and outputting a gate pulse. 1 phase control circuit, a second changeover switch for selecting a detection signal of the rotor position of the shaft generator or an output signal of the second PLL circuit, a phase control signal of the current control circuit, and the second A second phase control circuit that calculates a thyristor firing angle of the power converter and outputs a gate pulse based on the output signal selected by the changeover switch of 2;
When the main generator is disconnected from the propeller for propulsion by the clutch and the shaft generator is operated for electric propulsion by the power of the inboard bus, the current command of the second rotational speed control circuit is set by the first changeover switch. A value is output to the current control circuit and a detection signal of the position detector is output to the second phase control circuit by the second changeover switch;
When the clutch is connected to the propeller for propulsion by the clutch and is switched for shaft power generation to supply power from the shaft generator to the inboard bus, the first speed control circuit is switched by switching the first switch. Output the current command value to the current control circuit and switch the second changeover switch to output the output signal of the second PLL circuit to the second phase control circuit,
When switching the control device from shaft power generation to electric propulsion, the output of the first rotational speed control circuit is substituted as an initial value into the integral element of the second rotational speed control circuit, and the initial value immediately after switching To start the rotational speed control of the shaft generator,
When switching from electric propulsion to shaft power generation, the output of the second rotational speed control circuit is substituted as an initial value into the integral element of the first rotational speed control circuit, and immediately after switching, the synchronous adjustment is performed from the initial value. An integration setter for starting the rotation speed control of the phase machine is provided.

  According to the main engine shaft drive generator motor propulsion device according to the present invention, when switching the control device from shaft power generation to electric propulsion or from electric propulsion to shaft power generation, the shaft generator is used for electric propulsion. The second rotational speed control circuit that outputs the rotational speed command value and the first rotational speed control circuit that is used during shaft power generation and outputs the rotational speed command value of the synchronous phase adjuster are switched by the changeover switch and operate until just before that. Since the output of the rotation speed control circuit is assigned as an initial value to the integration element of the other rotation speed control circuit via the integration setter, the rotation speed control circuit starts from the initial value of the integration element immediately after switching. As a result, the current command value input to the current control circuit does not change abruptly and can be switched without stopping the ship.

It is a block diagram which shows typically one Embodiment of the main shaft drive generator motor propulsion apparatus by this invention. FIG. 2 is a control block diagram showing details of an integral setter 15-10, a first rotational speed control circuit 15-1, and a second rotational speed control circuit 15-2 that are components of FIG. It is a control block diagram which shows the detail of the current control circuit 15-4 which is a component of FIG. FIG. 2 is a reference control block diagram for describing an embodiment of a first rotation speed control circuit 15-1 and a second rotation speed control circuit 15-2 that are constituent elements of FIG. The reference rotation speed control circuit 15-1 (A) (b) is a control block diagram showing details of the second reference rotation speed control circuit 15-2 (A).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing an embodiment of a main shaft drive generator-motor / propulsion device according to the present invention. This embodiment is particularly characterized in a method for switching operation of a control device that controls a power converter having a converter and an inverter. Continuously and smoothly from electric propulsion to shaft power generation or from shaft power generation to electric propulsion. It is possible to switch to.

  In FIG. 1, reference numeral 1 denotes a main machine of an internal combustion engine such as diesel, and a propeller 4 for a propulsion and a shaft generator 5 are connected to a main machine shaft 2 via a clutch 3. The shaft generator 5 is provided with an automatic voltage regulator (hereinafter referred to as AVR) 6 for controlling the voltage, and is connected to the field winding 7 of the shaft generator 5. A power converter 100 includes a converter 8 including a thyristor, an inverter 9 including a thyristor, and a current detector 10. The current detector 10 detects the current of the DC part between the converter 8 and the inverter 9. The reactor 11 is for removing voltage distortion. A synchronous phase adjuster 12 has a field winding 14, and the field winding 14 is connected to an AVR 13 that controls the voltage of the synchronous phase adjuster 12.

  The control device 15 for shaft power generation and electric propulsion is connected to the converter 8 and the inverter 9 and adjusts the thyristor firing angle to control the current flowing through the power converter 100.

  The shaft generator 5 is provided with a position detector 16 for detecting the position of the rotor, and the synchronous phase adjuster 12 is provided with a rotation speed detector 17 for detecting the rotation speed. Furthermore, a transformer 19 for detecting a voltage on the AC side of the inverter 9 is connected to the circuit of the inboard bus 21, the circuit breaker 20, the reactor 11, and the inverter 9. A transformer 18 for detecting the armature voltage of the shaft generator 5 is connected to the circuit of the shaft generator 5 and the converter 8.

  The controller 15 includes a first rotation speed setting unit 22 that sets the rotation speed of the synchronous phase shifter 12 that is used during shaft power generation, and a second rotation that sets the rotation speed of the shaft generator 5 that is used during electric propulsion. The number setting unit 23 and a rotation number detection circuit 24 that outputs the rotation number of the shaft generator 5 from the detection waveform of the position detector 16 are connected.

  Inside the control device 15, the power converter 100 is arranged so that the rotational speed of the synchronous phase adjuster 12 detected by the rotational speed detector 17 during shaft power generation becomes the rotational speed set by the first rotational speed setter 22. The rotation speed of the shaft generator 5 detected by the position detector 16 and the rotation speed detection circuit 24 at the time of electric propulsion is the second rotation speed. A second rotation speed control circuit 15-2 that outputs a command value of the current flowing through the power converter 100 is provided so as to achieve the rotation speed set by the setting device 23.

  Between the first rotation speed control circuit 15-1 and the second rotation speed control circuit 15-2, the output of the first rotation speed control circuit 15-1 is used as a current command value during shaft power generation, and during electric propulsion. A first changeover switch 15-3 is provided for switching the output of the second rotation speed control circuit 15-2 to be a current command value.

  On the output side of the first changeover switch 15-3, a current control circuit that outputs a phase control signal so that the current detection value of the current detector 10 becomes the current command value selected by the first changeover switch 15-3. 15-4 is provided.

  Further, on the secondary side of the transformer 19 and the transformer 18, the first and second PLL circuits 15-5 and 15-6 for outputting a synchronization signal are provided, and the second PLL circuit 15-6 is used during shaft power generation. The second change-over switch 15-7 for selecting the output of the position detector 16 during electric propulsion is provided.

  A first phase for calculating a thyristor firing angle of the inverter 9 and outputting a pulse voltage based on the synchronization signal generated by the first PLL circuit 15-5 and the phase control signal output from the current control circuit 15-4. The thyristor firing angle of the converter 8 is calculated on the basis of the synchronization signal selected by the control circuit 15-8 and the second changeover switch 15-7 and the phase control signal output from the current control circuit 15-4, and the pulse voltage The second phase control circuit 15-9 is provided.

  The first changeover switch 15-3 and the second changeover switch 15-7 are provided on the a side when the control device 15 is operated for shaft power generation, and for electric propulsion for the control device 15 to perform emergency navigation. When driving, connect to b side.

  4A and 4B are references for explaining the first rotation speed control circuit 15-1 and the second rotation speed control circuit 15-2 in FIG. 1 according to the embodiment of the present invention in an easily understandable manner. It is a control block diagram of.

  In FIG. 4A, the reference rotation speed control circuit 15-1 (A) rotates the synchronous phase adjuster 12 detected by the rotation speed detector 17 from the rotation speed command value set by the first rotation speed setting device 22. A subtracting circuit 30 for subtracting the number detection value, a proportional amplifying circuit 31 for proportionally amplifying the output of the subtracting circuit 30, an integrating amplifying circuit 32 for integrating and amplifying the output of the subtracting circuit 30, and the proportional amplifying circuit 31 and the integrating amplifying circuit 32. And an adder circuit 33 for adding outputs.

  In FIG. 4B, the reference rotation speed control circuit 15-2 (A) rotates the shaft generator 5 detected by the rotation speed detection circuit 24 from the rotation speed setting value set by the second rotation speed setting unit 23. A subtracting circuit 40 for subtracting the number detection value, a proportional amplifying circuit 41 for proportionally amplifying the output of the subtracting circuit 40, an integrating amplifying circuit 42 for integrating and amplifying the output of the subtracting circuit 40, and the proportional amplifying circuit 41 and the integrating amplifying circuit 42. An adder circuit 43 for adding outputs and an absolute value circuit 44 for inputting the output of the adder circuit 43 and outputting an absolute value.

  FIG. 3 is a control block showing details of the current control circuit 15-4 of FIG. In FIG. 3, the current control circuit 15-4 is a current command for the reference rotation speed control circuit 15-1 (A) or the reference rotation speed control circuit 15-2 (A) output from the first changeover switch 15-3. A polarity detection circuit 50 for detecting the polarity of the value; an inversion circuit 51 for inputting the detection value of the current detector 10 and inverting the polarity; and when the control device 15 operates for shaft power generation, a When operating for electric propulsion to the side, a third changeover switch 52 connected to the b side, a subtraction circuit 53 for subtracting the output of the third changeover switch 52 from the output of the first changeover switch 15-3, It has a proportional amplification circuit 54 that proportionally amplifies the output of the subtraction circuit 53, an integration amplification circuit 55 that integrates and amplifies the output of the subtraction circuit 53, and an addition circuit 56 that adds the outputs of the proportional amplification circuit 54 and the integration amplification circuit 55.

  Furthermore, a fixed value circuit 57 that outputs a fixed value so that the thyristor firing angle of the inverter 9 becomes 150 degrees, and a fixed value circuit 58 that outputs a fixed value so that the thyristor firing angle of the converter 8 becomes 0 degrees, The fixed value circuit 59 that outputs a fixed value so that the thyristor firing angle of the converter 8 becomes 120 degrees, and the output of the adder circuit 56 when the output polarity of the polarity detection circuit 50 is positive, The changeover switch 60 that selects the output of the fixed value circuit 57 and outputs a phase control signal to the first phase control circuit 15-8, the output of the fixed value circuit 58 during shaft power generation, and the fixed value circuit during electric propulsion When the output polarity of the fourth selector switch 61 that selects and outputs 59 and the polarity detection circuit 50 is positive, the output of the fourth selector switch 61 is selected, and when it is negative, the output of the adder circuit 56 is selected. And the second phase It is composed of a changeover switch 62 for outputting a phase control signal to the control circuit 15-9.

  That is, the changeover switches 60 and 62 are connected to the + side when the polarity of the output of the first changeover switch 15-3 is positive by the polarity detection circuit 50, and to the-side when the output is negative.

  Next, the case where the control device 15 is operated for shaft power generation with such a configuration will be described. At this time, the first and second changeover switches 15-3 and 15-7 and the third and fourth changeover switches 52 and 61 (see FIG. 3) are connected to the a side.

  First, when the shaft generator 5 is operated in the power generation mode, the propeller 4 for propulsion and the shaft generator 5 are driven via the clutch 3 when the operation of the main engine 1 is started. The shaft generator 5 starts power generation by supplying a field current to the field winding 7 with the AVR 6. The power generated by the shaft generator 5 is converted to DC power by the converter 8 and then converted again to AC power by the inverter 9, and the power is supplied to the inboard bus 21 via the reactor 11, the synchronous phase adjuster 12 and the circuit breaker 20. Supply. The output reactive power of the synchronous phase adjuster 12 is controlled by adjusting the current flowing through the field winding 14 by the AVR 13.

  In order to operate the shaft generator 5 in the power generation mode, the first rotation speed setter 22 is set so that the rotation speed of the synchronous phase adjuster 12, that is, the frequency of the armature voltage is higher than the frequency of the voltage of the inboard bus 21. Set the rotation speed command value with. At this time, since the current command value that is the output of the reference rotation speed control circuit 15-1 (A) is positive, the changeover switches 60 and 62 in FIG. Since it is input to the second phase control circuit 15-9 via the changeover switch 62, the thyristor firing angle of the converter 8 is fixed at 0 degrees.

  Further, the deviation value between the current command value from the first changeover switch 15-3 and the current detection value of the current detector 10 is input to the first phase control circuit 15-8 via the changeover switch 60, and the inverter 9 The thyristor firing angle is adjusted so that the current detection value of the current detector 10 matches the current command value of the first rotation speed control circuit 15-1. The direction of the current detected by the current detector 10 when the shaft generator 5 is operated in the power generation mode is the direction from the converter 8 to the inverter 9.

  Here, if the rotation speed of the synchronous phase shifter 12, that is, the frequency of the armature voltage is set to be lower than the frequency of the voltage of the inboard bus 21 by the first rotation speed setting device 22, the reference rotation speed control circuit 15- The output of 1 (A) is negative, and a negative current command value is input to the current control circuit 15-4. That is, since current is controlled to flow from the inverter 9 to the converter 8, the shaft generator 5 is driven as a synchronous motor and enters an electric mode in which the operation of the main machine 1 is energized.

  In the electric mode, the polarity detection circuit 50 in FIG. 3 detects a negative value, and the changeover switches 60 and 62 are connected to the negative side. Inverter 9 is fixed value circuit 57 and the thyristor firing angle is fixed at 150 degrees, and converter 8 adjusts the thyristor firing angle so that the current value flowing through current detector 10 matches the current command value.

  Next, a case where the control device 15 is operated for electric propulsion will be described. In this case, the main machine 1 is disconnected from the main machine shaft 2 by the clutch 3, and the first and second change-over switches 15-3 and 15-7 and the third and fourth change-over switches 52 and 61 are b. Connected to the side. At this time, the shaft generator 5 includes the converter 8, the position detector 16, the rotation speed detection circuit 24, the reference rotation speed control circuit 15-2 (A), the current control circuit 15-4, and the second phase. The control circuit 15-9 constitutes a thyristor motor.

  The reference rotation speed control circuit 15-2 (A) outputs a current command value so that the rotation speed of the shaft generator 5 detected by the rotation speed detection circuit 24 becomes the rotation speed set by the second rotation speed setting unit 23. To do. The current command value input to the current control circuit 15-4 becomes positive due to the action of the absolute value circuit 44. Therefore, the changeover switches 60 and 62 are connected to the + side.

  Further, since the current flowing between the converter 8 and the inverter 9 is inverted in polarity by the inverting circuit 51 and then input to the subtracting circuit 53 via the third changeover switch 52, the current flows from the inverter 9 to the converter 8. .

  The thyristor firing angle of the converter 8 is fixed to 120 degrees by the fixed value circuit 59 because the fourth changeover switch 61 is connected to the b side, and the second changeover switch 15-7 via the second changeover switch 15-7. The converter 8 outputs an AC voltage for rotating the shaft generator 5 using the detection waveform of the position detector 16 input to the second phase control circuit 15-9 as a synchronization signal. On the other hand, the deviation between the current command value from the first changeover switch 15-3 and the output of the changeover switch 52 is amplified by the proportional amplification circuit 54 and the integral amplification circuit 55, and the output value of the addition circuit 56 for adding these is switched. The thyristor firing angle of the inverter 9 is inputted to the first phase control circuit 15-8 via the switch 60, and the current detection value of the current detector 10 is the current command value of the second rotation speed control circuit 15-2. It is adjusted to become.

  From the above, the frequency is converted from the inboard bus 21 by the inverter 9 operating as a converter and the converter 8 operating as an inverter to supply electric power to the shaft generator 5, and the shaft generator 5 is propelled by operating as a thyristor motor. The propeller 4 can be driven, and the ship can be navigated in an emergency when the main engine 1 stops due to a failure or the like.

  As described above, the control device 15 can be used for shaft power generation and electric propulsion to use the shaft generator as a generator, or can be used for emergency propulsion electric propulsion. There's a problem.

  4A and 4B, the outputs of the subtracting circuits 30 and 40 before switching are supplied to the integrating amplifying circuits 32 and 42. The reference rotational speed control circuits 15-1 (A) and 15-2 (A) shown in FIGS. When the control device 15 is switched so as to perform control for shaft driving and electric propulsion from this state, the current command value input to the current control circuit 15-4 changes abruptly.

  As a result, a phenomenon occurs in which fluctuations in the rotational speed of the shaft generator 5 are promoted from the electric side, and fluctuations in the rotational speed of the synchronous phase adjuster 12 are promoted from the electric side.

  In order to avoid such a phenomenon, the control device of the present embodiment uses the circuit configuration of FIG. 2 instead of the reference rotation speed control circuit shown in FIGS. 4 (a) and 4 (b). The difference from the reference rotational speed control circuit is that an integral setter 15-10 is provided, and the first rotational speed control is performed based on the command of the integral setter 15-10 when switching to different operation modes for shaft power generation and electric propulsion. The output of the circuit 15-1 or the second rotational speed control circuit 15-2 is input as an initial value to the integral element of the other rotational speed control circuit, and is configured to start from the initial value immediately after switching. .

  FIG. 2 is a control block diagram showing details of the integration setter 15-10, the first rotation speed control circuit 15-1, and the second rotation speed control circuit 15-2. In the figure, a first rotation speed control circuit 15-1 that performs PI control includes a fixed value circuit 70 that outputs a fixed value 0 to the current control circuit 15-1 (A) of FIG. 5 changeover switches 71 are additionally provided.

  As with the first and second change-over switches 15-3, 15-7, the third and fourth change-over switches 52, 61, the fifth change-over switch 71 is operated by the control device 15 for shaft power generation. Connect to the a side when operating, and connect to the b side when operating for electric propulsion.

  When the fifth changeover switch 71 is connected to the a side (for shaft power generation), the synchronous phase adjuster 12 detected by the rotational speed detector 17 from the rotational speed command value set by the first rotational speed setter 22. The output obtained by subtracting the detected rotation speed value by the subtraction circuit 30 is input to the proportional amplification circuit 31 and the integral amplification circuit 32 via the fifth changeover switch 71 to perform PI control, and the first changeover switch 15-3. To the current control circuit 15-4. When the fifth changeover switch 71 is connected to the b side (for electric propulsion), 0 of the fixed value circuit 70 is input to the proportional amplifier circuit 31 and the integral amplifier circuit 32.

  On the other hand, the second rotation speed control circuit 15-2 has a fixed value circuit 72 that outputs a fixed value 0 and a sixth changeover switch 73 with respect to the reference current control circuit 15-2 (A) of FIG. Is added.

  Similar to the first and second change-over switches 15-3, 15-7, the third and fourth change-over switches 52, 61, the sixth change-over switch 73 is operated by the control device 15 for shaft power generation. Connect to the a side when operating, and connect to the b side when operating for electric propulsion.

  When the sixth changeover switch 73 is connected to the b side (for electric propulsion), the shaft generator detected by the rotation speed detection circuit 24 from the rotation speed command value set by the second rotation speed setting circuit 23 5 is subtracted by the subtraction circuit 40 and is input to the proportional amplification circuit 41 and the integral amplification circuit 42 via the sixth changeover switch 73, and PI control is performed, so that the first changeover switch is obtained. It is output to the current control circuit 15-4 via 15-3. When the sixth changeover switch 73 is connected to the a side (for shaft power generation), 0 is input from the fixed value circuit 72 to the proportional amplification circuit 41 and the integral amplification circuit 42 via the sixth changeover switch 73. .

  The integration setter 15-10 is configured by connecting two seventh and eighth changeover switches 74 and 75. When the control device 15 is operating for shaft power generation, each changeover switch 74 and 75 is connected. Is connected to the a side and to the b side when the control device 15 is operating for electric propulsion. As a result, when the control device 15 is operating for shaft power generation, since the changeover switches 74 and 75 are connected to the a side, the output of the addition circuit 33 on the first rotation speed control circuit 15-1 side. The value is output to the current control circuit 15-4 via the first changeover switch 15-3, and the second rotation speed control on the other side via the seventh and eighth changeover switches 74 and 75. The initial value is also input to the integration amplifier circuit 42 which is an integration element of the circuit 15-2.

  Since the second rotation speed control circuit 15-2 receives 0 from the fixed value circuit 72 to the proportional amplifier circuit 41 and the integral amplifier circuit 42 via the sixth changeover switch 73, the output value of the adder circuit 43 Corresponds to the output value of the adder circuit 33 of the first rotation speed control circuit 15-1.

  Here, the main machine 1 in operation is disconnected by the clutch 3, and the first and second change-over switches 15-3 and 15-7, the third, the fourth, the fifth, the sixth, the seventh and the eighth change-over switches. When 52, 61, 71, 73, 74, and 75 are switched from the a side to the b side, the control device 15 switches from normal shaft power generation to electric propulsion during survey navigation or the like.

  At this time, the output of the subtraction circuit 40 in the second rotation speed control circuit 15-2 is input to the proportional amplification circuit 41 and the integral amplification circuit 42 via the sixth changeover switch 73, and PI control is performed. At this time, the integral amplification circuit 42 as an integral element has a current command value at the time of shaft power generation immediately before switching the control device 15 for shaft power generation to that for electric propulsion as an initial value. The current command value, which is the output of, is controlled from its initial value and output to the current control circuit 15-4 to control the shaft generator 5. Therefore, the current command value at the time of electric propulsion does not change suddenly with the switching, and the switching can be performed without stopping the ship.

  The same applies when the control device 15 is switched from electric propulsion to shaft power generation. When the changeover switches 15-3, 15-7, 52, 61, 71, 73, 74, 75 are switched from the b side to the a side, The output of the subtraction circuit 30 inside the one rotation speed control circuit 15-1 is input to the proportional amplification circuit 31 and the integral amplification circuit 32 via the fifth changeover switch 71.

  At this time, the integral amplifier circuit 32 which is an integral element includes the seventh and eighth adders 43 to 8 in the second rotational speed control circuit 15-2 until immediately before the control device 15 is switched from electric propulsion to shaft power generation. The current command value at the time of electric propulsion is substituted as an initial value via the changeover switches 74 and 75. Therefore, the current command value that is the output of the adder circuit 33 is output to the current control circuit 15-4 using the current command value at the time of electric propulsion as an initial value, and the synchronous motor 12 is controlled. Can be switched without stopping the ship.

  In this way, it is possible to continuously switch from shaft power generation to electric propulsion or from electric propulsion to shaft power generation without abruptly changing the current command value to the current control circuit 15-4. It is possible to eliminate the occurrence of a period during which the ship cannot be operated.

  Although the present invention has been described with the embodiment, it goes without saying that various modifications can be made without departing from the present invention.

DESCRIPTION OF SYMBOLS 1 ... Main machine 2 ... Main machine shaft 3 ... Clutch 4 ... Propeller 5 for propulsion | shafts Generator 6 and 13 ... AVR
7 ... Field winding of shaft generator,
8 ... Converter (inverter)
9 ... Inverter (converter)
DESCRIPTION OF SYMBOLS 10 ... Current detector 11 ... Reactor 12 ... Synchronous phase adjuster 14 ... Field winding 15 of synchronous phase adjuster ... Control device 15-1 for axial power generation and electric propulsion ... Speed control circuit 15-1 (A) ... Reference rotational speed control circuit 15-2 ... rotational speed control circuit 15-2 (A) ... reference rotational speed control circuit 15-3 ... changeover switch 15-4 ... current control circuits 15-5, 15-6 ... PLL circuit 15- 7 ... changeover switches 15-8, 15-9 ... phase control circuit 15-10 ... integration setter 16 ... position detector 17 ... rotational speed detectors 18, 19 ... transformer 20 ... breaker 21 ... inboard buses 22, 23 Rotation speed setter 24 Rotation speed detection circuits 30 and 40 Subtraction circuits 31 and 41 Proportional amplification circuits 32 and 42 Integration amplification circuits 33 and 43 Addition circuit 44 Absolute value circuit 50 Polarity detection circuit 51 Inversion Circuit 52 ... changeover switch 53 ... subtraction Road 54 ... proportional amplifier circuit 55 ... integrating amplifier circuit 56 ... summing circuit 57, 58, 59 ... fixed value circuits 60, 61, 62 ... selector switch 74, 75, ... changeover switch 100 ... power converter

Claims (1)

Main engine, marine propulsion propeller and shaft generator connected to the main engine via a clutch, a power converter including a thyristor for converting electric power into direct current and then converting into direct current, and a direct current section of the power converter A current detector for detecting the current of the power converter, a synchronous phase adjuster for supplying reactive power to the power converter and the inboard bus, and the power converter based on the detected value of the rotational speed of the synchronous phase adjuster and the shaft generator A control device for controlling the rotation speed, a first rotation speed setting device for setting the rotation command value of the synchronous phase adjuster, and a second rotation speed setting device for setting the rotation speed command value of the shaft generator,
The control device outputs a current command value of the DC section of the power converter by PI control so that the rotation speed command value of the first rotation speed setting device matches the rotation speed of the synchronous phase adjuster. And a second rotation that outputs the DC portion of the power converter by PI control so that the rotation speed command value of the second rotation speed setting device matches the rotation speed of the shaft generator. A first changeover switch for selecting whether the current command value of the direct current section of the power converter is an output of the first rotational speed control circuit or an output of the second rotational speed control circuit; A current control circuit that outputs a phase control signal so that a current flowing through a DC portion of the power converter matches the current command value; and a first PLL circuit that generates a synchronization signal from a voltage on the AC side of the power converter And generating a synchronization signal from the armature voltage of the shaft generator And calculating a thyristor firing angle of the power converter based on a second PLL circuit, a phase control signal of the current control circuit, and a synchronization signal generated by the first PLL circuit, and outputting a gate pulse. 1 phase control circuit, a second changeover switch for selecting a detection signal of the rotor position of the shaft generator or an output signal of the second PLL circuit, a phase control signal of the current control circuit, and the second A second phase control circuit that calculates a thyristor firing angle of the power converter and outputs a gate pulse based on the output signal selected by the changeover switch of 2;
When the main generator is disconnected from the propeller for propulsion by the clutch and the shaft generator is operated for electric propulsion by the power of the inboard bus, the current command of the second rotational speed control circuit is set by the first changeover switch. A value is output to the current control circuit and a detection signal of the position detector is output to the second phase control circuit by the second changeover switch;
When the clutch is connected to the propeller for propulsion by the clutch and is switched for shaft power generation to supply power from the shaft generator to the inboard bus, the first speed control circuit is switched by switching the first switch. Output the current command value to the current control circuit and switch the second changeover switch to output the output signal of the second PLL circuit to the second phase control circuit,
When switching the control device from shaft power generation to electric propulsion, the output of the first rotational speed control circuit is substituted as an initial value into the integral element of the second rotational speed control circuit, and the initial value immediately after switching To start the rotational speed control of the shaft generator,
When switching from electric propulsion to shaft power generation, the output of the second rotational speed control circuit is substituted as an initial value into the integral element of the first rotational speed control circuit, and immediately after switching, the synchronous adjustment is performed from the initial value. A main shaft drive generator-motor apparatus and propulsion apparatus, characterized in that an integral setting device is provided for starting the rotation speed control of the phase machine.

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