JP3835601B2 - Power feeding device with motor driven generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a system having a large-capacity load having a large load fluctuation, such as an electric propulsion device of a ship, from a so-called motor-driven power generator that generates power by driving a power generator by a motor such as a diesel engine or a steam turbine. The present invention relates to a power supply device that supplies power to the power supply.
[0002]
[Prior art]
In general, an electric propulsion type ship is provided with two motor-driven propulsion devices, and in order to drive the two propulsion devices, two prime mover-driven power generation devices are provided corresponding to the propulsion devices. In the driving region (cruising speed region), one or two propulsion devices are driven by one of the two power generators for the purpose of reducing operating costs, and the high-speed driving region where the load becomes high Then, two propulsion devices are driven by two power generators.
[0003]
In addition, the power generator for driving such a propulsion device may be shared with the power source of the ship power. In this case, even if the load of the propulsion device fluctuates greatly, the drive motor of the power generation device It is required to operate stably and supply stable electric power to the inboard power.
[0004]
Conventionally, a power feeding device as shown in FIG. 4 has been used to meet such a demand.
[0005]
In this power feeding device, two prime mover drive power generators P1 and P2 that generate power by driving generators GL1 and GL2 by prime movers DE1 and DE2 such as diesel engines are connected in parallel to a common propulsion bus Bd, Electric motors M1 and M2 for driving a marine vessel propulsion device (not shown) are connected in parallel to the bus Bd via power converters CI1 and CI2 for controlling the feed power. Circuit breakers CB1 and CB2 are provided between the power generation devices P1 and P2 and the bus Bd to protect the power generation devices P1 and P2 from overload and the like.
[0006]
Apart from such a power supply system for propulsion systems, two power generators (diesel engine drive power generators) Ps1, Ps2 and an emergency power generator (diesel engine drive power generator) are used as power supply systems for ship power. Pse is provided and connected in parallel to the inboard power bus Bs via the circuit breakers CBs1, CBs2, and CBse. Various inboard power loads (not shown) are connected in parallel to the bus Bs. The total capacity of this inboard power load is usually about 10% of the propulsion device load capacity, which is smaller than the propulsion device.
[0007]
In such a power feeding device, the power source of the propulsion power system and the power source of the inboard power system are independent from each other, so that the load of the propulsion power system is lighter than the normal state, the light load state, and the propulsion power system Even if the parallel operation state of the diesel engines DE1 and DE2 of the power generators P1 and P2 becomes unstable, there is no effect on the inboard power supply system, so the power source of the inboard power system has the advantage of ensuring stability. is there. However, on the other hand, the use of two independent prime mover-driven power generators increases the weight and installation space of the power supply device, which is disadvantageous in terms of cost. In particular, when used on a ship, the space and the weight are limited, so the weight and the installation space need to be as small as possible.
[0008]
In order to avoid an increase in equipment weight and installation space in this way Recommended Sharing the power source of the advance power system and the power source of the inboard power system has already been performed.
[0009]
In such an apparatus, since the electrical specifications of the load of the propulsion power system and the load of the inboard power system are different, the common bus of the inboard power system is connected to the common bus Bd of the propulsion power system via the power converters Ps11 and Ps12. Bs is connected, and these power converters convert power supplied from the propulsion power system bus Bd into power of voltage and frequency used in the ship power system and supply the power to the ship power system bus Bs.
[0010]
According to such a conventional device, since the prime mover drive power generation device serving as the power source of the inboard power system can be omitted, the weight and installation space of the power supply device can be reduced correspondingly. When the propulsion power load is extremely light as shown in the figure, the diesel engines that drive the generators are lightly loaded. Has the disadvantage of becoming unstable.
[0011]
[Problems to be solved by the invention]
As described above, in an apparatus that feeds power from a plurality of prime mover-driven power generators to a large-capacity load having a large load fluctuation and a small-capacity load having a small load fluctuation, independent power-driven power generation corresponding to the large-capacity load and the small-capacity load, respectively. Providing the device has the disadvantage of increasing the weight and installation space of the power generation device. In addition, when the large-capacity load is light, the driving prime movers of a plurality of power generators are operated in parallel, and the load on each prime mover becomes an extremely light load that is a fraction of that. In addition to the inability to adjust the parallel operation by the apparatus, the operation of the prime mover becomes unstable, and the power supply to the small capacity load becomes unstable.
[0012]
An object of the present invention is to solve such inconveniences and to supply power to a large capacity load with a large load fluctuation and a small capacity load with a relatively small load fluctuation by using a plurality of prime mover drive power generators operating in parallel as power sources. In the power supply device, the weight and installation space of the motor-driven power generation device can be reduced, the power generation device can be stably operated even when the large-capacity load becomes light, and the power supply to the small-capacity load can be stabilized. It is providing the electric power feeding control apparatus which can be performed.
[0013]
[Means for Solving the Problems]
In order to achieve such a problem, the present invention provides: A large-capacity propulsion power load with a large load fluctuation and a relatively large load by a motor-driven power generator that generates power by driving a power generator with a constant-speed motor such as a diesel engine installed in an electric propulsion type ship In the case of supplying power to a small-capacity ship power load with small fluctuations, two sets of the motor-driven power generators are provided, and each motor-driven power generator has a propulsion generator that supplies power to a large-capacity propulsion power load, and a small capacity A power generator for supplying power to the ship's inboard power load, and a prime mover for driving both of the generators in common, and the propulsion from each propulsion generator via a power converter for propulsion power load control Power is supplied in parallel to the propulsion system power supply bus connected to the power load, and power is supplied in parallel from each power generator to the power system power supply bus connected to the inboard power load. And when the propulsion power load is light, the motors of the two sets of the motor-driven power generators are kept operating and the operation of the power converter connected to one of the motor-driven power generators is stopped and the other Power is supplied to the propulsion system power supply bus only from the prime mover drive power generator .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on examples shown in the drawings.
[0017]
[First embodiment]
FIG. 1 is a block diagram showing a first embodiment of the present invention applied to a power supply device for an electric propulsion type ship.
[0018]
In FIG. 1, P1 and P2 are a three-phase AC large-capacity generator GL1, a small-capacity generator GS1, and a large-capacity generator that are commonly driven by a diesel engine DE1 and DE2 via a generator drive shaft, respectively. This is a prime mover drive power generator provided with GL2 and a small capacity generator GS2. Large-capacity generators GL1 and GL2 in each set of power generators are coupled to a drive shaft of a marine vessel propulsion device (not shown) via circuit breakers CB1 and CB2 and power conversion devices CI1 and CI2 for power supply control. The large-capacity propulsion motors M1 and M2 are connected in parallel to the propulsion system power supply bus Bd connected in parallel to supply power to the propulsion motor that is a large-capacity load.
[0019]
The other small-capacity generators GS1, GS2 of the power generators P1, P2 are connected to a power system power supply bus Bs connected to a ship power load (not shown) via non-contact semiconductor switches TS1, TS2 and circuit breakers CBs1, CBs2. Connected in parallel to supply power to the ship's power load. The inboard power load is a small capacity load of about 10% of the capacity of the propulsion power load (propulsion motor).
[0020]
As described above, the large-capacity generator GL and the small-capacity generator GS in each power generator supply power to independent loads that are driven by a common diesel engine DE but different from each other. The switch Sd provided in the propulsion system power supply bus Bd is a switch for selecting the parallel operation and the independent operation of the propulsion motors M1 and M2, and the parallel operation is selected by closing the switch Sd.
[0021]
Pe is an emergency generator device composed of an emergency diesel engine DEe and a generator Ge. For some reason, the small-capacity generators GS1 and GS2 in the power generators P1 and P2 cause an onboard power load. In order to supply power to an important power load in a ship that is activated only in an emergency when power supply to the ship becomes impossible and cannot be stopped due to a power failure, the power supply power supply bus Bs is connected via a circuit breaker CBe.
[0022]
In such a power supply apparatus, when the propulsion motors M1 and M2 are normally loaded and the ship is cruising, both sets of prime mover drive power generators P1 and P2 are operated together, the switch Sd is closed, and both Power is supplied to the propulsion motors M1 and M2 in parallel from the large-capacity propulsion generators GL1 and GL2. The inboard power load is supplied in parallel from two small capacity inboard power generators GS1, GS2. At this time, since an appropriate load is applied to the diesel engines DE1 and DE2, they are operated in parallel but maintain a stable operating state. Therefore, at this time, the operations of the small-capacity generators GS1 and GS2 are also stable, and stable power is supplied to the power system power supply bus Bs.
[0023]
When the operation state of the ship becomes low speed or stopped, the power consumption of the propulsion motors M1 and M2 decreases, and the light load state becomes 1/10 or less of the normal, and the diesel engines DE1 and DE2 of the two sets of power generators P1 and P2 The parallel operation state becomes unstable.
[0024]
When the load detection device (not shown in FIG. 1) detects a low load, the power output from the generator GL2 is stopped by narrowing down the output of one of the power converters CI2, for example, and only from the generator GL1 Power is supplied to the propulsion motors M1 and M2. At the same time, the output of the small-capacity generator GS2 on the power generation device P2 side is narrowed down, or the output of the small-capacity generator GS2 is shut off by a high-speed switch such as a semiconductor switch, and the power system to which the inboard power load is connected Power supply to the power supply bus Bs is performed only from the small-capacity generator GS1 of the power generation device P1 on the side where power supply is continued.
[0025]
Thus, in a light load state, power is supplied only from the generators (GL1, GS1) of one power generation device P1, and power supply is stopped from the generators (GL2, GS2) of the other power generation device P2. Therefore, the diesel engine DE2 on the power generation device P2 side is idle and is in an idling state, which is the same state as when the diesel engine DE1 on the power generation device P1 side is operated alone. As a result, the two diesel engines continue to operate stably without becoming unstable even when the load is light.
[0026]
Therefore, according to this apparatus, even if a large-capacity propulsion motor has a light load, power supply to a small-capacity onboard power load system does not become unstable, and power can be always stably supplied.
[0027]
[Second Embodiment]
FIG. 2 shows a second embodiment when the present invention is applied to a power supply device for a ship.
[0028]
In FIG. 2, P1 and P2 are for large capacity propulsion generators GL1 and GL2 for supplying power to propulsion motors M1 and M2 by diesel engines DE1 and DE2, respectively, and for small capacity power to be supplied to an inboard power load. The power generator is configured to drive the generators GS1 and GS2 in common. Each generator includes field FL1, FL2, FS1, and FS2, and excitation adjusters EXL1, EXL2, EXS1, and EXS2 that adjust the generator output voltage by controlling the excitation current of these fields.
[0029]
The outputs of the propulsion generators GL1 and GL2 are connected to the propulsion system power supply bus Bd to which the propulsion motors M1 and M2 are connected in parallel via the circuit breakers CB1 and CB2 and the power converters CI1 and CI2 for controlling the propulsion motor, respectively. Is done. Sd11, Sd12, Sd21, Sd22, and Sd3 connected to the bus Bd are selection switches for selecting a motor to be operated among the propulsion motors M1 and M2.
[0030]
The outputs of the power generators GS1 and GS2 are connected to a power system power supply bus Bs to which various inboard power loads (not shown) are connected via semiconductor switches TS1 and TS2 and circuit breakers CBS1 and CBS2, respectively.
[0031]
CLd is a propulsion system control device that monitors and controls the power supply of the propulsion generators GL1 and GL2, and CLs is a power system control device that monitors and controls the power supply of the power generators GS1 and GS2 systems. This is a single operation setting switch for setting a power generator that performs single operation when the load is light, and single operation setting signals a1 and a2 are input from this switch Sp to the propulsion system controller CLd and the power system controller CLs. .
[0032]
The propulsion system controller CLd determines the load of the propulsion generator based on the input voltage and current detection signals b1, b2 and c1, c2 of the propulsion generators GL1, GL2 and the independent operation setting signals a1, a2. When the state is detected and the operation command signals d1, d2, e1, e2 are output to the excitation adjusters EXL1, EXL2 and the power converters CI1, CI2 of the propulsion generator according to the state, and a light load is applied A light load detection signal f is generated and applied to the power system controller CLs.
[0033]
Power system control device CLs includes light load detection signal f from propulsion system control device CLd, independent operation setting signals a1 and a2, output voltages and current detection signals h1, h2 and i1, i2 of power generators GS1 and GS2, and The voltage detection signals l1 and l2 of the inboard power supply bus Bs are input, and the power generator excitation regulators EXS1 and EXS2, the diesel engines DE1 and DE2, the circuit breakers CBs1 and CBs2, and the semiconductor switch according to these signals and the like Control signals g1, g2, j1, j2, k1, k2 and m1, m2 are output to TS1 and TS2, respectively.
[0034]
Next, the operation of the apparatus of the second embodiment configured as described above will be described with reference to the operation time chart shown in FIG.
[0035]
FIG. 3 shows an operation state in the normal operation mode in which the two power generation devices P1 and P2 are operated in parallel. 3A shows an operation (load) pattern of the propulsion motors M1 and M2 serving as loads. The operation pattern of stop-acceleration region-constant speed region-deceleration region-stop is repeated, and the magnitude of the load is proportional to the speed of the ship, so it is shown here as load L. (B) is an independent operation setting signal set by the setting switch Sp, a1 is a setting signal on the power generation device P1 side, and a2 is a setting signal on the power generation device P2 side. FIG. 3 shows a state in which the power generation device P1 is set to the power generation device that operates alone at the time of light load by closing the setting switch Sp shown in FIG. 2 to the contact a1 side. (C) is an operation command signal for the propulsion motor, and is indicated by two values of stop and operation. (D) is a light load detection signal f, which is “1” when a light load is detected, and “0” otherwise.
[0036]
In addition, (E), (F), (G), (H), and (I) in FIG. 3 respectively represent a diesel engine DE1, a propulsion generator GL1, a power converter CI1, and a power generator for power generator P1. The output states of the machine GS1 and the semiconductor switch TS1 are shown. Similarly, (J), (K), (L), (M), and (N) are respectively the diesel engine DE2, the propulsion generator GL2, the power converter CI2, the power generator GS2, and the power generator P2. The output state of semiconductor switch TS2 is shown.
[0037]
The switches Sd11 to Sd3 in the power feeding system of FIG. 2 are all closed because they are modes in which the two power generation devices P1 and P2 and the propulsion motors M1 and M2 are operated in parallel.
[0038]
(A) Operation of propulsion system power supply system
When the operation command signal (FIG. 3C) rises from “stop” to “operation” at time t1 in FIG. 3, the propulsion system control device CLd responds to this command to the conversion devices CI1, CI2 with the control signals e1, e2 is sent and these converters start operation. As a result, the electric power generated by the two power generation devices P1 and P2 is supplied in parallel to the propulsion motors M1 and M2 via the power conversion devices CI1 and CI2, and these motors are started and gradually accelerated. Rises. Until the speed, that is, the load amount of the motor reaches the light load level L1 in FIG. 3A, it is detected that the control device CLd is light load, and the light load detection signal f becomes “1” level. When the level L1 is exceeded, the level becomes “0”. When the load amount of the propulsion motor reaches the steady load Ln at the steady speed, it is kept constant here, and the load amount is reduced according to the subsequent deceleration command, and when it becomes zero, the operation command signal becomes “stop”. In this deceleration process, the load amount becomes the light load level L1 or less, and the light load detection signal f becomes “1” level again. Thereafter, such an operation pattern is repeated according to the operation command.
[0039]
The light load detection level Ll is set to 10% of the steady load Ln during the period N from the starting start point of the drive motor at which the light load detection signal f becomes “1” level to the light load level Ll.
When the power generators P1 and P2 are operated in parallel, the propulsion generators GL1 and GL2 of the two power generators P1 and P2 each bear a load of 5% of the steady load. The diesel engines DE1 and DE2 being operated are not in a state where the constant speed operation can be stably performed, and the operation becomes unstable.
[0040]
In this embodiment, when the light load detection signal f is “1” level, the control device CLd continues the operation of the power conversion device CI1 on the side of the power generation device P1 set by the operation setting switch Sp, The operation command to the conversion device CI2 on the other power generation device P2 side is interrupted to stop the operation, and power supply from the power conversion device CI2 to the propulsion motor is stopped (FIG. 3G, (L )reference). Therefore, in the light load region, P2 of the two power generating devices that are operated in parallel is removed, and the state becomes equivalent to the single operation of only P1. The power generator of the stand will bear all. That is, at this time, since the operation mode selection switch Sd3 inserted into the bus Bd connecting the propulsion motors M1 and M2 is turned on, even if the converter CI2 is stopped, the converter that is being operated Power is also supplied from the CI 1 to the propulsion motor M2 via the switches Sd11-Sd3-Sd22. As a result, in the light load state, both the prime movers of the two prime mover-driven generators continue to operate, but the generator becomes equivalent to the single operation of one propulsion generator, and the prime mover (diesel engine) in parallel operation ) To avoid unstable operation.
[0041]
When the speed of the propulsion motor increases and the load amount exceeds the light load detection level Ll, the light load detection signal f becomes “0” level. Therefore, the control device CLd An operation command is given to CI2 (FIG. 3 (L)), and the power conversion device CI2 operates to supply power again. For this reason, when the load becomes a high load, power is supplied to the propulsion motors M1 and M2 in parallel from the two power generation devices P1 and P2, so that the supplied power does not become insufficient.
[0042]
(B) Operation of the power supply system: When two power generators are operating in parallel
When two generators GS1 and GS2 for inboard power driven in common with the propulsion generators GL1 and GL2 by the diesel engines DE1 and DE2 in the power generators P1 and P2, respectively, are operated in parallel, the power supply shown in FIG. In the system, the circuit breakers CBs1, CBs2 and the semiconductor switches TS1, TS2 are turned on, and the outputs of the generators GS1, GS2 are supplied in parallel to the inboard power bus Bs to which various inboard power loads (not shown) are connected. Since the capacity of the inboard power load is as small as 1/10 or less of the capacity of the propulsion system (propulsion motor) as described above, in the state where it is detected that the load is light in the propulsion system power supply system as described above. The load state of the prime mover (diesel engine) is still a light load state.
[0043]
In the operation at this time, in the circuit of FIG. 2, the propulsion system control device CLd generates the propulsion system light load detection signal f (FIG. 3D) and applies it to the power system control device CLs. When the control device CLs receives the light load detection signal f, since the single operation setting signal a1 is given from the setting switch Sp, the control device CLs narrows the excitation current to the excitation adjuster EXs2 of the generator GS2 on the non-set side. The control signal g2 is given, the output voltage of the generator GS2 is slightly lowered, the off command signal m2 is given to the semiconductor switch TS2 to turn them off, and then the shutoff command k2 is given to the breaker CBs2 to shut off. Then, the generator GS2 is disconnected from the bus Bs, and the output of the generator is stopped (see FIG. 3M). When the generator GS2 is disconnected, the excitation current is narrowed down by the excitation adjuster EXs2, and the output voltage of the generator GS2 is slightly reduced to increase the voltage on the bus side of the semiconductor switch TS2. Can be. Since the circuit breaker CB2 performs a circuit breaking operation without a load current, the burden on the circuit breaker CB2 can be reduced and the life can be extended.
[0044]
As a result, the power generator is in a state where only the generator GS1 operates alone, and the operation of the diesel engine DE2 of the power generator P2 is continued (see FIG. 3 (J)), but the load applied to this is Since the engine becomes zero and the diesel engine DE1 on the power generator P1 side is substantially in a single operation state, the two diesel engines become unstable in a light load state with a large capacity propulsion system load. Can be avoided, and power can be stably supplied to the inboard power system power supply bus Bs.
[0045]
In the above, in order to shift the power generator to a single operation at light load, the circuit breaker or the semiconductor switch is shut off after the output voltage of the generator is narrowed down by the excitation regulator. You may make it interrupt | block the output of generator GS1, GS2 only by CBs1, CBs2 or semiconductor switch TS1, TS2. In this case, the circuit breakers CBs1 and CBs2 are opened and closed when the system is stopped, and the semiconductor switches TS1 and TS2 are turned on and off during normal operation. Therefore, even with frequent control, it can withstand long-term use and improve reliability.
[0046]
(C) Operation of the power system power supply system: Switching the operation of one power generator
When one of the two power generators GS1 and GS2 is operated alone, the circuit breaker on the side of the power generator to be stopped, for example, CBs2 is set to “open”, and the power generator GS2 is Disconnect from the inboard power supply bus Bs.
[0047]
For example, when the generator to be operated is switched from GS1 to GS2, the diesel engine DE2 on the stopped power generator P2 side is started and the power generator GS2 is turned on so as not to cause a power failure of the inboard power system power supply bus Bs. increase. In order to synchronize with the operating generator GS1, the power system controller CLs takes in the output voltage signal h2 of the power generator GS2 and the voltage signal l1 of the inboard power supply bus Bs, and matches the frequency and phase of both. Thus, the speed control signal j2 is given to the diesel engine DE2 to control the speed. When the control device CLs determines that the frequency and phase of the voltage signals l1 and h2 match, it issues a closing signal k2 to the circuit breaker CBs2 and turns it on, and gives an on signal m2 to the semiconductor switch TS2 to turn it on. Then, the generators GS1 and GS2 are set in a parallel operation state.
[0048]
Thereafter, the breaker CBs1 on the generator GS1 side is cut off by the cut-off signal k1, and the semiconductor switch TS1 is turned off by the off signal m1, thereby disconnecting the power generator GS1 from the inboard power supply bus Bs, and generating power for power generation. The operation switching from the machine GS1 to GS2 is completed.
[0049]
【The invention's effect】
As described above, according to the present invention, power is supplied to a large-capacity load having a large load variation and a small-capacity load having a relatively small load variation by a prime mover driving power generator that generates power by driving the generator by a prime mover such as a diesel engine. In this case, the prime mover-driven generator is provided with a large-capacity generator and a small-capacity generator, and both generators are configured to be driven in common by a single prime mover and have a large-capacity Since power is supplied to the large-capacity load from the small-capacity generator to the small-capacity load separately, the two generators can be driven by a common prime mover, reducing the weight of the generator An effect of reducing the installation space can be obtained.
[0050]
In the present invention, two sets of prime mover-driven power generators configured to drive a large-capacity generator and a small-capacity generator in common by one prime mover are provided. The two prime movers of the two sets of prime mover-driven generators continued to operate when the large-capacity load became a light load. The parallel operation at the time of light load of two prime movers is made by supplying power to both the large-capacity and small-capacity loads independently from any one of the selected prime mover-driven power generators. The state is eliminated, the motor can be stably operated, and the effect of stably supplying power from the small-capacity generator can be obtained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a basic embodiment of the present invention.
FIG. 2 is a block diagram showing a more specific embodiment of the present invention.
FIG. 3 is a time chart for explaining the operation of the present invention.
FIG. 4 is a configuration diagram showing a conventional apparatus.
[Explanation of symbols]
P1, P2: Motor drive power generator
GL1, G12: Propulsion generator (large capacity generator)
GS1, GS2: Inboard power generator (small capacity generator)
M1, M2: Propulsion motor (large capacity load)
Bd: Propulsion system power supply bus
Bs: Inboard power feeding bus

Claims (1)

A large-capacity propulsion power load with a large load fluctuation and a relatively large load by a motor-driven power generator that generates power by driving a power generator with a constant-speed motor such as a diesel engine installed in an electric propulsion type ship In the case of supplying power to a small-capacity ship power load with small fluctuations, two sets of the motor-driven power generators are provided, each motor-driven power generator includes a propulsion generator that supplies power to a large-capacity propulsion power load, and a small capacity A power generator for supplying power to the ship's inboard power load, and a prime mover that drives both of the generators in common, and the propulsion from each propulsion generator through a power converter for propulsion power load control Power is supplied in parallel to the propulsion system power supply bus connected to the power load, and power is supplied in parallel from each power generator to the power system power supply bus connected to the inboard power load. And when the propulsion power load becomes light load, the motors of the two sets of the motor-driven power generators are kept operating and the operation of the power converter connected to one of the motor-driven power generators is stopped and the other A power supply apparatus using a motor-driven power generator, wherein power is supplied to the propulsion system power supply bus only from the motor-driven power generator.

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