JP2014103832A - Inboard load Drive system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate load driving motors, such as a pump motor and a thruster motor, at a controlled rotating speed without employing an inverter and a starter which are operated only upon arrival at a port.SOLUTION: An output side of a main-engine-driven generator 3 is connected to a synchronous phase modifier 11 via a first switch 31, a converter 6 and a separately excited inverter 7. The synchronous phase modifier 11 is further connected to a load drive motor such as a cargo pump drive motor 26 or a thruster drive motor 29 via a third switch 33 (34) and connected to an inboard busbar 21 via a fourth switch 35. The inboard busbar 21 and an input terminal of the converter 6 are connected by a second switch 32.

Description

  The present invention relates to an inboard load drive system including a main shaft drive power generator.

  Conventionally, for the purpose of energy saving, a main engine shaft drive power generator that drives a shaft generator with a main engine such as a diesel engine (hereinafter referred to as a main engine) and supplies power to each load in the ship is used in many ships. Used (see, for example, Patent Document 1).

  In recent years, even in ships where such main shaft drive power generators are installed, there are increasing cases of adopting inverters in load drive motors such as electric cargo pumps and electric thrusters for further energy saving. .

An example of a conventional ship load driving system equipped with these devices is shown in FIG.
In FIG. 3, reference numeral 1 denotes a main engine (denoted as M / E in the drawing) such as a diesel engine, and the propeller 2 for propulsion and a shaft generator (denoted as SG in the figure) 3 are driven by the main engine shaft. I am doing so. Reference numeral 4 denotes an automatic voltage regulator (indicated as AVR in the figure, hereinafter referred to as a first automatic voltage regulator), which is applied to the field winding 5 in order to control the output voltage of the shaft generator 3 to a constant voltage. It adjusts the flowing excitation current.

  Reference numeral 6 denotes a converter having a diode configuration for converting AC power having a frequency determined by the rotational speed of the main engine 1 output from the shaft generator 3 into DC power, and the DC power output from the converter 6 passes through a DC circuit. Is applied to the separately excited inverter 7 composed of a thyristor, where it is converted into AC power and output.

  Reference numeral 8 denotes a current detector for detecting a direct current flowing in a direct current circuit connecting the output terminal of the converter 6 and the input terminal of the separately excited inverter 7. Reference numeral 9 denotes a reactor for removing distortion from the output voltage of the separately excited inverter 7, and reference numeral 10 denotes a transformer for detecting the output voltage of the separately excited inverter 7.

  A synchronous phase adjuster 11 adjusts the excitation current flowing in the field winding 12 by an automatic voltage regulator (indicated as AVR in the figure, hereinafter referred to as a second automatic voltage regulator) 13. Thus, the voltage on the output side of the separately excited inverter 7 is controlled to a constant voltage and the reactive power is adjusted. Reference numeral 14 denotes a rotation speed detector for detecting the rotation speed of the synchronous phase adjuster 11.

  Reference numeral 15 denotes a rotation speed setting value for setting the rotation speed command value of the synchronous phase adjuster 11, that is, the output frequency of the separately-excited inverter 7, which is normally set to be the same frequency as the frequency of the inboard power. . 16 is for adjusting the thyristor firing angle of the separately excited inverter 7 in accordance with the rotational speed command value of the rotational speed setter 15 to control the output frequency of the separately excited inverter 7, that is, the rotational speed of the synchronous phase adjuster 11. It is a control apparatus and an internal component is mentioned later.

  Reference numeral 17 denotes a circuit breaker for connecting a connecting portion between the reactor 9 and the synchronous phase adjuster 11 to an inboard bus 21 described later. Reference numeral 18 denotes a starter motor used when starting the synchronous phase adjuster 11, and 19 denotes a circuit breaker for supplying power from the inboard bus 21 to the starter motor 18.

  In the present specification, a portion surrounded by a broken line from the shaft generator 3 to the circuit breaker 19 described above is referred to as a main shaft drive generator 20 for convenience. The main shaft drive power generator 20 has a constant frequency AC power corresponding to the rotation speed command value set by the rotation speed setting unit 15, with the AC power having a frequency determined by the rotation speed of the main machine 1 output from the shaft generator 3. This is a device that converts the data into an output. Reference numeral 22 denotes an automatic synchronous input device (indicated as ASY in the figure). When the main shaft drive power generator 20 is synchronized with the inboard bus 21, the circuit breaker 17 is turned on to synchronize the synchronous phase adjuster 11 with the inboard bus. throw into. Reference numeral 23 denotes a diesel generator (indicated as D / G in the figure) for supplying power to the inboard bus 21.

  A cargo pump motor 26 for driving a cargo pump for cargo handling is connected to the inboard bus 21 via a circuit breaker 24 and an inverter (indicated as INV / CONV in the figure) 25. The cargo pump electric motor 26 is mainly operated after the ship has been berthed, and its rotation speed is controlled by the inverter 25.

  Similarly, a thruster motor 29 is connected to the inboard bus 21 via a circuit breaker 27 and a starter 28. The thruster motor 29 drives the thruster propeller 30 when the ship is on the shore, and the starter 28 is for suppressing the inrush current of the thruster motor 29.

Next, a detailed configuration of the control device 16 will be described.
Reference numeral 16-1 denotes a direct current between the converter 6 and the separately excited inverter 7 by PI control based on the rotational speed of the synchronous phase adjuster 11 detected by the rotational speed detector 14 and the rotational speed command value set in advance by the rotational speed setter 15. It is a rotation speed control circuit (indicated as an AFC circuit in the figure) that outputs a current command value of a direct current flowing through the circuit. Reference numeral 16-2 denotes a current control circuit that outputs a phase control signal by PI control from the current command value input from the rotational speed control circuit 16-1 and the current value detected by the current detector 8 (denoted as ACR circuit in the figure). ). Reference numeral 16-3 denotes a PLL circuit that outputs a synchronization signal from the output voltage of the separately excited inverter 7 detected by the transformer 10. 16-4 determines the thyristor firing angle of the separately excited inverter 7 based on the phase control signal input from the current control circuit 16-2 and the synchronization signal input from the PLL circuit 16-3, and the gate pulse signal Is a phase control circuit that outputs.

Hereinafter, when the ship is sailing and the shaft generator 3 is usable, the operation of each device from the start of the main shaft drive power generator 20 to the power supply to the inboard bus 21 will be described.
First, the shaft generator 3 is driven by the main machine 1, and the excitation current flowing through the field winding 5 is adjusted by the first automatic voltage regulator 4, so that the shaft generator 3 has a constant voltage and corresponds to the rotation speed of the main machine 1. Outputs AC power at the specified frequency.

  Next, the circuit breaker 19 is turned on and the start of the synchronous phase shifter 11 is started by the starter motor 18. The synchronous phase adjuster 11 is speeded up to a predetermined rotational speed by the output power of the shaft generator 3 through the converter 6, the inverter 7, and the reactor 9, and the start is completed. Thereafter, with the circuit breaker 19 turned off and the power supply to the starter motor 18 stopped, the automatic synchronizer 22 turns on the circuit breaker 17 to supply the power of the shaft generator 3 to the inboard bus 21. At this time, the second automatic voltage regulator 13 adjusts the exciting current flowing in the field winding 12 to control the voltage of the synchronous phase adjuster 11 to a constant voltage, and from the synchronous phase adjuster 11 to the separately excited inverter 7 and the inboard. Reactive power is supplied to the bus 21.

  The control device 16 uses the rotation speed control circuit 16-1 to determine the current detector 8 based on the rotation speed of the synchronous phase adjuster 11 detected by the rotation speed detector 14 and the rotation speed command value set in advance by the rotation speed setting device 15. A current command value flowing in a DC circuit provided with a current control value is output, and a phase control signal is output from the current command value and the current detection value detected by the current detector 8 in the current control circuit 16-2. The phase control circuit 16-4 adjusts the thyristor firing angle of the separately-excited inverter 7 on the basis of the synchronization signal output from the PLL circuit 16-3, and the rotational speed of the synchronous phase adjuster 11 is set by the rotational speed setting device 15 The rotation speed, that is, the output frequency of the separately excited inverter 7 is a device that operates so as to be a frequency corresponding to the rotation speed command value set by the rotation speed setting unit 15.

Next, the case where a ship is docked at a port is demonstrated.
When landing the ship at the port, the main engine 1 is stopped, the circuit breaker 17 is turned off, and the operation of the main shaft drive power generator 20 is stopped. Thereafter, the circuit breaker 27 is turned on, the electric power of the inboard bus 21 is used, the thruster propeller 30 is driven by the thruster motor 29 via the starter 28, and the ship is propelled in the lateral direction.

  When the ship arrives at the shore, the circuit breaker 27 is turned off to stop the operation of the thruster. Thereafter, the circuit breaker 24 is turned on to perform cargo handling, and the cargo pump motor 26 is driven via the inverter 25 using the power of the inboard bus 21.

Japanese Patent Application Laid-Open No. 6-276795

  Unlike the general load in the ship, load driving motors such as the cargo pump motor 26 and the thruster motor 29 described above are normally operated only when they arrive at the port. These load driving motors require special devices such as the inverter 25 and the starter 28 in spite of a short operation time, so that the equipment cost of the inboard load driving system as a whole becomes high. There is also a problem that requires a place to install the device.

  The present invention has been made to solve the above-described problems, and is provided with a load driving motor such as a pump motor or a thruster motor without providing an inverter or a starter that is operated only when arriving at a port. It is an object of the present invention to provide an onboard load drive system including a main shaft drive power generator that can be operated while controlling the rotation speed.

  In order to solve the above problems, an inboard load drive system according to the present invention includes an inboard bus, a shaft generator driven by a main engine, and a first automatic voltage regulator for adjusting an output voltage of the shaft generator. A converter that converts the output power of the shaft generator into direct current; a separately-excited inverter that converts direct current power that is the output of the converter into alternating current power; and a current detector that detects current on the direct current side of the converter; A synchronous phase adjuster that supplies reactive power to the separately excited inverter and the inboard bus, a second automatic voltage regulator that adjusts an output voltage of the synchronous phase adjuster, and a rotational speed that sets the rotational speed of the synchronous phase adjuster Using the PI control from the setting device, the rotation speed detector for detecting the rotation speed of the synchronous phase adjuster, the rotation speed command value set by the rotation speed setting device and the detection value of the rotation speed detector Con A rotational speed control circuit that outputs a command value of the current flowing to the DC side of the motor, and a phase control using PI control from the current command value that is output from the rotational speed control circuit and the current value detected by the current detector A current control circuit that outputs a signal, a PLL circuit for generating a synchronization signal from the voltage on the AC side of the separately-excited inverter, a phase control signal that is the output of the current control circuit, and a synchronization that is the output of the PLL circuit A phase control circuit for outputting a gate pulse signal from the signal to the separately-excited inverter, a first contactor provided in series with a circuit for connecting between the shaft generator and the converter, and the first contact A second contactor provided between a vessel and a circuit connecting the converter and the inboard bus, and one for connecting an output side of the separately excited inverter to a load driving motor or Several third contactors, a fourth contactor provided between the output side of the separately excited inverter and the inboard bus, and the first to fourth contactors corresponding to the operation mode of the inboard load In the inboard load drive system comprising a switching device for turning on or off, when supplying the output power of the separately-excited inverter to the inboard bus, the first and fourth contactors are turned on by the switching device, When turning off the second and third contactors and driving the load driving motor with the output power of the inboard bus, the switching device turns off the first and fourth contactors, The third contactor is turned on, and the load drive motor is driven by converting the frequency of the power of the inboard bus to the frequency according to the rotation speed set by the rotation speed setting device by the separately-excited inverter. The load drive with the rotation speed setting device It is characterized by controlling the rotational speed of the motor for driving.

  By adopting the inboard load drive system of the present invention, it is possible to omit a dedicated inverter or starter used for a load driving motor used when a ship is berthing, and also, normally, an axis drive power generation that is not used when a ship is berthing Effective utilization of the apparatus is achieved, and there is an effect that utilization efficiency can be improved. Furthermore, this has the effect of providing a cheaper and space-saving system.

The block diagram of the ship load driving system in embodiment of this invention. The figure which shows the ON / OFF state of each contactor based on the operation mode of the inboard load drive system shown in FIG. The block diagram of the conventional ship load driving system.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The same reference numerals are given to the same devices or parts as the conventional devices or parts shown in FIG. 3, and the suffixes are added to the reference numerals for the devices corresponding to the conventional devices. Omitted.

[Constitution]
In the configuration diagram of the inboard load drive system in FIG. 1, the embodiment of the inboard load drive system according to the present invention is largely different from the conventional example as follows.

  In other words, the circuit breaker 24 and the inverter 25, the circuit breaker 27 and the starter 28 in FIG. 3 are removed, and the circuit connecting the output side of the shaft generator 3 and the input side of the converter 6 is connected in series. A point provided with a contactor 31, a point provided with a contactor 32 for connecting or releasing between the contactor 31 and the circuit connecting the input side of the converter 6 and the inboard bus 21, and the separately excited inverter 7 And the contact point 33 for connecting or opening the cargo pump motor 26 to the inboard power line 37, and the contact point 33 for connecting or opening the cargo pump motor 26 to the inboard power line 37. Similarly, in order to connect or open the contact point 34 for connecting or releasing the thruster motor 29 to the inboard power wiring 37 and the connection part of the circuit breaker 17 and the inboard power wiring 37 and the inboard bus 21. The point provided with the contactor 35, and the point provided with the switching device 36 that outputs a signal for turning on or off the contactor 31 to the contactor 35 based on the operation mode of the inboard load drive system in this embodiment. The range of the rotation speed command value set by the rotation speed setting device 15 is expanded so that the speed of the cargo pump motor 26 and the thruster motor 29 can be controlled.

In the present invention, reference numeral 20 given to the conventional apparatus is obtained by providing the contactor 31 in the main shaft drive power generator and changing a part of the configuration and changing a part of the operation method. Has been changed to 20A. For convenience of explanation, the contactor 31 is a first contactor, the contactor 32 is a second contactor, the contactors 33 and 34 are collectively a third contactor, and the contactor 35 is a fourth contactor. Call it.
Other circuit configurations are the same as those in FIG.

[Action]
Hereinafter, the operation of this embodiment will be described with reference to the manner in which the contactors 31 to 35 are turned on and off based on the three operation modes of the inboard load drive system shown in FIG.

(I) At the time of power feeding to the inboard bus 21 First, the case where the output power of the main shaft drive power generator 20A is supplied to the inboard bus 21 such as during navigation of the ship will be described.

  In this case, the shaft generator 3 is turned on by turning on the first contactor 31 and the fourth contactor 35 with the second contactor 32 and the third contactors 33 and 34 turned off. The first contactor 31, the converter 6, the separately excited inverter 7, and the reactor 9 are connected to the synchronous phase adjuster 11, and the breaker 17 is connected to the inboard power wiring 37. Further, the inboard power wiring 37 is connected to the inboard bus 21 via the fourth contactor 35. Thus, the output power of the shaft generator 3 is adjusted to the frequency of the inboard bus 21 by the converter 6 and the separately excited inverter 7 and supplied to the inboard bus 21. At this time, the rotational speed command value of the rotational speed setter 15 is set and fixed so that the output frequency of the separately excited inverter 7 is the same as the output frequency of the inboard bus 21.

(Ii) At the time of driving the thruster motor 29 Next, a case where the thruster motor 29 is operated when the ship touches the harbor will be described.
In this case, with the first contactor 31, one contactor 33 of the third contactor and the fourth contactor 35 turned off, the other of the second contactor 32 and the third contactor is turned off. The contactor 34 is turned on.

  As a result, the shaft generator 3 and the converter 6 are disconnected, and further, the inboard bus 21 and the inboard power wiring 37 are disconnected. On the other hand, the inboard bus 21 is connected to the synchronous phase adjuster 11 through the second contactor 32, the converter 6, the separately excited inverter 7, and the reactor 9, and further, the circuit breaker 17, the inboard power wiring 37, and the third contactor. The other contactor 34 is connected to the thruster motor 29.

  Thereby, the electric power of the inboard bus 21 is supplied to the second contactor 32, the converter 6, the separately excited inverter 7, the reactor 9, and the synchronous phase adjuster 11, and further from the inboard power wiring 37 through the circuit breaker 17. Is supplied to the thruster motor 29 via the other contactor 34 of the contactor.

  At this time, since the rotational speed of the thruster motor 29 is determined by the frequency of the output voltage of the separately excited inverter 7, the rotational speed setter 15 that determines the rotational speed command value of the synchronous phase adjuster 11 is operated to drive the thruster motor 29 at speed. Control.

(Iii) When the cargo pump electric motor 26 is driven When the cargo pump is operated after the ship has berthed, the third contactor 34 of the third contactor is turned off from the state at the time of the thruster operation. One contactor 33 of the contactor is turned on.
The rotation speed of the cargo pump motor 26 is controlled by operating the rotation speed setting device 15 in the same manner as when the thruster motor 29 is operated.

[Modification]
The present invention is not limited to the embodiments described above, and can be implemented with appropriate modifications as described in (i) to (iv) below.

  (I) In the configuration diagram of FIG. 1, the first contactor 31 and the second contactor 32 that is in the open / closed state are depicted as independent contactors. It is possible to replace the contactor 32 with a single-pole / double-throw type switching switch so that when one of the contactors 32 is integrated and one of them is turned on, the other is turned off.

  (Ii) Although not shown in the configuration diagram of FIG. 1, a state in which a clutch is provided between the main engine 1 and the propeller 2 for propulsion, and the propeller 2 for propulsion is separated from the drive shaft of the main engine 1 even when the ship is berthing. When the shaft generator 3 is driven by the main engine 1, the contactor 32 is turned off, the contactor 31 is turned on, and the output power of the shaft generator 3 is used instead of the inboard bus 21, and the motor for the cargo pump. 26 or the thruster motor 29 may be driven.

  (Iii) In the above embodiment, the examples of the cargo pump motor 26 and the thruster motor 29 have been described. However, the present invention is not limited to this, and any load driving motor may be used as long as the ship is berthing.

  (Iv) In the above embodiment, the operation method in the case where the converter 6 is configured by a diode has been described. However, the converter 6 can also be configured by a thyristor. In this case, a thyristor motor can be constituted by the thyristor converter, the separately excited inverter 7 and the synchronous phase adjuster 11 and can be started by intermittent start, so that the starter motor 18 and the circuit breaker 19 can be eliminated.

  As described above, according to the embodiment of the present invention, the power of the inboard bus 21 is frequency-converted by the control circuit of the shaft drive power generator 20A when the ship is berthing, and the ship berthing such as the cargo pump electric motor 26 and the thruster electric motor 29 is performed. Since it is configured to drive the load drive motor used at times, it is no longer necessary to provide a dedicated control device such as an inverter or starter, which has been used in load drive motors in the past. It is possible to effectively use the shaft drive power generator that does not, and to increase the utilization efficiency.

  DESCRIPTION OF SYMBOLS 1 ... Main machine, 2 ... Propeller for propulsion, 3 ... Shaft generator, 4 ... 1st automatic voltage regulator, 5 ... Field winding, 6 ... Converter, 7 ... Separately excited inverter, 8 ... Current detector, 9 DESCRIPTION OF SYMBOLS ... Reactor, 10 ... Transformer, 11 ... Synchronous phase adjuster, 12 ... Field winding, 13 ... 2nd automatic voltage regulator, 14 ... Revolution detector, 15 ... Revolution setter, 16 ... Controller, 16-1 ... Rotational speed control circuit, 16-2 ... Current control circuit, 16-3 ... PLL circuit, 16-4 ... Phase control circuit, 17 ... Circuit breaker, 18 ... Synchronous phase adjuster starting motor, 19 ... Circuit breaker , 20A ... main shaft drive power generator, 21 ... inboard bus, 22 ... automatic synchronizer, 23 ... diesel generator, 26 ... cargo pump motor, 29 ... thruster motor, 30 ... thruster propeller, 31 ... first Contactor, 32 ... second contactor, 33 or 34 ... third Contactor, 35 ... fourth contactor, 36 ... switching device, 37 ... inboard power wiring.

Claims (5)

An inboard bus, a shaft generator driven by a main engine, a first automatic voltage regulator for adjusting an output voltage of the shaft generator, a converter for converting output power of the shaft generator into a direct current, and the converter A separately-excited inverter that converts the DC power that is the output of the converter into AC power, a current detector that detects a current on the DC side of the converter, a synchronous phase adjuster that supplies reactive power to the separately-excited inverter and the inboard bus, and A second automatic voltage regulator for adjusting the output voltage of the synchronous phase adjuster, a rotational speed setter for setting the rotational speed of the synchronous phase adjuster, and a rotational speed for detecting the rotational speed of the synchronous phase adjuster A rotational speed control circuit for outputting a rotational speed command value set by the rotational speed setter and a detected value of the rotational speed detector using PI control to output a command value of a current flowing to the DC side of the converter; , A current control circuit that outputs a phase control signal using PI control from a current command value that is output from the rotation speed control circuit and a current value detected by the current detector, and is synchronized with the voltage on the AC side of the separately-excited inverter A PLL circuit for generating a signal, a phase control signal that is an output of the current control circuit, a phase control circuit that outputs a gate pulse signal to the separately-excited inverter from a synchronization signal that is an output of the PLL circuit, and the shaft A first contactor provided in series with a circuit connecting between the generator and the converter, and provided between the circuit connecting the first contactor and the converter and the inboard bus. A second contactor, one or more third contactors for connecting the output side of the separately excited inverter to a load driving motor, the output side of the separately excited inverter, and the inboard A fourth contactor provided between the lines, and the switching device in response to the operation mode of the inboard load is the first to turn on or off the fourth contactor, in inboard load driving system including a
When supplying the output power of the separately excited inverter to the inboard bus, the switching device turns on the first and fourth contactors, turns off the second and third contactors,
When driving the load driving motor with the output power of the inboard bus, the switching device turns off the first and fourth contactors, turns on the second and third contactors, and The load drive motor is driven by converting the frequency of the power of the bus to the frequency according to the rotation speed set by the rotation speed setting device by the separately-excited inverter, and the load drive motor is driven by the rotation speed setting device. An inboard load drive system characterized by controlling the rotation speed.   2. The inboard load drive system according to claim 1, wherein the converter comprises a diode.   2. The inboard load drive system according to claim 1, wherein the converter is constituted by a thyristor.   The inboard load drive system according to any one of claims 1 to 3, wherein the first contactor and the fourth contactor are configured as a single pole double throw type contactor. .   A clutch is provided between the main engine and the propeller for propulsion so that the shaft generator is driven by the main engine even when the ship is berthing, the second contactor is turned off, the first contactor is turned on, and the output of the shaft generator is turned on. The inboard load drive system according to any one of claims 1 to 4, wherein the load driving motor is driven using electric power.

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