JPS6318993A - Frequency control system for biaxial drive differential type shaft generator - Google Patents

Abstract

PURPOSE:To obtain an AC power of constant frequency by so controlling the rotating speeds of armature and field windings that the relative rotating speed of the armature winding and the field winding is maintained constant. CONSTITUTION:The field winding 14 of a synchronous generator 10 is shaft- coupled with a main driving machine 24. A hydraulic pump 28 shaft-coupled and driven through gears 22, 26 with the machine 24 is provided. A hydraulic motor 32 is disposed and connected through an oil pressure conduit 30 with the pump 28, and the output shaft of the motor 32 is coupled through a gear 34 with an armature winding 12. The rotating speeds of the windings 14 and 12 are input to a governor 18, which outputs a control signal so that the relative speed between the windings 12 and 14 becomes constant. Thus, the AC power of constant frequency can be easily obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a two-shaft drive differential shaft power generation device driven by variable rotation speed axes such as various propeller shafts and axles whose rotation speeds fluctuate. The present invention relates to a frequency control method for keeping the output frequency of this shaft power generation device constant.

[Conventional technology]

Generally, as a frequency control method for a synchronous generator, for example,
A device having a configuration as shown in FIG. 2 is known.

That is, in FIG. 2, reference numeral 10 indicates a synchronous generator, 12 indicates an armature winding of the generator 10, and 14 indicates a field winding. In this case, the armature winding 12 of the generator 10 is fixedly arranged, and the field & PL winding 14 is connected to the turbine 1.
The power generator R10 is configured to generate alternating current power by being coaxially coupled to the power generator R10 and driven to rotate integrally with the power generator R10. Furthermore, the rotation speed of the turbine 16 is detected and this detection signal is input to the speed governor 18, and the speed governor 18 controls and operates the steam valve 20 that adjusts the flow rate of steam supplied to the turbine 16. The rotation speed of the turbine 16 is kept constant, and the output frequency of the generator 10 is kept constant.

However, one winding of an alternator with a field winding and an armature winding is fixedly arranged, and the other winding is connected to and integrated with a variable rotation speed shaft such as various propeller shafts or axles. In a conventional shaft power generation device configured to be driven in rotation, it was not possible to obtain output power at a constant frequency due to the variability of the relative rotational speeds of both windings.

From this point of view, the applicant first coupled one winding of an alternator, which includes an armature winding and a field winding, to a variable rotation speed shaft and integrally drives it to rotate. In addition, the other winding is configured to be rotationally driven by a variable speed drive machine provided separately from the variable rotation speed shaft, and the rotation speed of one winding is differentially controlled with respect to the rotation speed of the other winding. We developed a two-shaft drive differential type shaft power generation device configured to generate constant voltage and constant frequency power by controlling the system, and filed a patent application (Japanese Patent Application No. 59-262815).

[Problem that the invention seeks to solve]

In the above-mentioned two-shaft drive differential shaft power generator, in order to obtain alternating current power of a constant frequency, one winding coupled to the variable rotation speed shaft and a variable speed winding provided separately from the variable rotation speed shaft are required. It is necessary to provide a device for controlling the rotational speed of the variable speed drive machine so as to maintain a constant relative rotational speed with the other winding rotatably driven by the variable speed drive machine.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a two-shaft drive differential shaft power generation device, in which the rotation speed of one winding that is rotationally driven by a variable rotation speed shaft, and the rotation speed of one winding that is rotationally driven by a variable rotation speed shaft, and a variable speed and the rotation speed of the other winding that is rotationally driven by the drive machine, and based on these detected values, feeds the variable speed drive machine so as to maintain the relative rotation speed of both windings at a constant value. In addition to performing hack control, for predictable rotational speed fluctuations such as changes in the set rotational speed of the variable rotational speed axis, the rotational speed fluctuations are predictively calculated and controlled to prevent frequency fluctuations. To provide a frequency control method that can

[Means for solving problems]

The frequency control method of the two-shaft drive differential shaft power generator according to the present invention generates alternating current power by driving an alternating current generator equipped with a field winding and an armature winding coupled to a variable rotation speed shaft. It consists of a shaft power generation device, in which one of the field winding and armature winding is connected to the variable rotation speed shaft and driven to rotate, and a variable speed generator is provided separately from the variable rotation speed shaft. The other winding is rotationally driven by a drive machine, and the rotation speed of the other winding is differentially controlled with respect to the rotation speed of the one winding.
11, in a two-shaft drive differential shaft power generator configured to detect the rotational speed of the field winding and the armature winding;
The present invention is characterized in that the rotation speed of the negative winding is controlled so as to compare these rotation speeds and keep the opposing rotation speed constant.

In the frequency control method described above, the variable speed drive machine is composed of a hydraulic motor driven by a hydraulic pump coupled to a variable rotation speed shaft, and the rotation speed detection signals of the field winding and armature winding are sent to the governor. The speed governor may be configured to output a control signal for adjusting the swash plate angle of the hydraulic pump/hydraulic motor by m nodes. In this case, an auxiliary controller that predicts and calculates changes in the predictable rotation speed of the field winding or armature winding is provided, and the output signal of this auxiliary controller is added to the governor to control fluctuations in the output frequency. It can also be configured to prevent this.

[Effect]

According to the frequency control circuit of the two-shaft drive differential shaft power generator according to the present invention, the rotation speed of one of the windings rotationally driven by the variable rotation speed shaft and the frequency control circuit provided separately from the variable rotation speed shaft are controlled. The rotational speed of the other winding that is rotatably driven by the variable-speed driver is detected, and based on these detection signals, the variable-speed driver is fed so as to maintain the relative rotational speed of both windings at a constant value. Bank control makes it possible to maintain the output frequency of the shaft generator at a constant level, and also to control the rotation speed in response to predictable fluctuations in rotation speed, such as changes in the set rotation speed of the variable rotation speed shaft. Fluctuations can be predicted and controlled to prevent fluctuations in the output frequency.

〔Example〕

Next, an embodiment of a frequency control method in a two-shaft drive differential shaft power generator according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the frequency control system of the present invention, in which a shaft power generator is driven by a main engine for propulsion of a ship.

That is, in FIG. 1, reference numeral 10 indicates a synchronous generator, 12 indicates an armature winding of the generator 10, and 14 indicates a field winding. In this case, the armature winding 12 and the field winding 14 are both rotatably supported by bearings (not shown), and the field winding 14 is configured to be axially coupled to the main drive machine 24 and driven to rotate. do. In addition, the main drive machine 24
A hydraulic pump 28 that is axially coupled and driven via gears 22 and 26 is installed. Furthermore, a hydraulic motor 32 is connected to the hydraulic pump 28 via a hydraulic conduit 30, and the output shaft of the hydraulic motor 32 is coupled to the armature winding I2 via a gear 34. In this case, the hydraulic motor 32 converts the hydraulic pressure generated by the hydraulic pump 28 into rotational driving force and transmits it to the armature winding 2, and the rotational speed is determined by the swash plate angle of the hydraulic pump 28/hydraulic motor 32 ( (not shown) allows continuous adjustment from the forward direction to the reverse direction.

Next, a frequency control circuit in the shaft power generator configured as described above will be explained. First, a speed governor 18 is provided which detects the rotational speed of the field winding 14 and the rotational speed of the armature winding 12 using appropriate detectors, and inputs the obtained detection signals, respectively. Therefore, the speed governor 18 outputs a signal to the hydraulic pump 28 to control the rotation speed of the hydraulic motor 32 that rotationally drives the armature winding 12, and connects the armature winding 12 and the field winding. A main control circuit is configured to perform feedbank control so that the relative rotational speed with respect to 14 is constant.

In this case, the speed governor 18 uses the detection signal of the output frequency of the generator 10 as its L control input, compares this detection signal with the frequency setting value, and outputs the required control signal. It can also be configured like this.

On the other hand, in order to prevent frequency fluctuations due to changes in the rotation speed that can be predicted in advance, such as when changing the rotation speed of the main drive machine 24, frequency prediction control can be performed. In this case, an auxiliary controller 36 is provided to perform predictive calculation to compensate for frequency fluctuations when changing the rotational speed of the main drive machine 24 to generate a required control signal, and to transmit this control signal to the governor 18.
A frequency prediction control circuit is configured to prevent frequency fluctuations by inputting the

Therefore, the control operation obtained by the frequency control circuit of this embodiment configured as described above is as follows. That is, the output frequency of the generator 10 is determined by the armature winding 12 and the field r.
The rotation speed of the field winding 14 is determined by the rotation speed of the main drive machine 24, and is controlled by the rotation speed of the main drive machine 24. Therefore, the rotation speed of the armature winding 12 is adjusted to keep the relative rotation speed of both windings constant.Therefore, during normal control, the governor 18 The rotational speed detection signal of the magnetic winding 14 is input and compared, and a calculation is performed to control the rotational speed of the armature winding 12 so as to keep the relative rotational speed of both windings constant, and a necessary control signal is generated. This control signal is input to the hydraulic pump 28 to adjust the swash plate angle of the hydraulic pump 28/hydraulic motor 32, thereby controlling the rotation speed of the hydraulic motor 32 that rotationally drives the armature winding 12.

Next, a case will be described in which the setting of the rotational speed of the main drive machine 24 is changed when changing the speed of the ship. In this case, as the rotational speed of the main drive machine 24 changes, the field winding 1
4 changes, and is controlled by the aforementioned main control circuit to keep the relative rotation speed constant. however,
Frequency fluctuations occur in the output of the shaft power generator due to control delay time, transmission delay time from when the control command is output until the rotation speed of the armature winding 12 is actually adjusted, and the like. At this time, the greater the rate of change and amount of change in the rotational speed of the main drive machine 24, the greater the range of frequency fluctuation.

Therefore, when changing the rotation speed, which can be predicted in advance, the auxiliary controller 36 uses the frequency prediction control circuit described above to generate a necessary control signal by performing predictive calculations to compensate for control delays and transmission delays. By adding this control signal to the speed governor 18, the amount of frequency fluctuation can be suppressed.

〔Effect of the invention〕

As is clear from the embodiments described above, according to the present invention,
Either the armature winding or the field winding is driven to rotate by a variable rotation speed shaft such as the main drive of a ship, and the other winding is rotated so that the relative rotation speed of both windings is kept constant. By controlling the number of rotations of the wire, it is possible to easily output constant frequency AC power.

Further, according to the frequency control method of the present invention, when a predictable change in the rotation speed is made such as when changing the rotation speed setting of the main drive motor of a ship, by providing an auxiliary controller that performs predictive control, control delays and transmission delays can be avoided. Therefore, it is possible to easily perform frequency control with a small frequency fluctuation range.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

FIG. 1 is a control system diagram showing an embodiment of a two-shaft drive differential type shaft power generator implementing the frequency control method according to the present invention;
The figure is a control system diagram showing an overview of a frequency control method in a conventional synchronous generator. 10... Generator 12... Armature winding 14...
・Field winding 16...Turbine 18...Governor
20... Control valve 22) 26.34... Gear 2
4... Main drive machine 28... Hydraulic pump 30... Hydraulic pipe line 32... Hydraulic motor 36... Auxiliary controller patent applicant Kawasaki Heavy Industries, Ltd. Fuji Electric Co., Ltd. FIG, 2

Claims (3)

[Claims] (1) Consisting of a shaft power generation device that generates AC power by driving an alternating current generator equipped with a field winding and an armature winding coupled to a variable rotation speed shaft, the field winding and armature winding One of the windings is connected to the variable rotation speed shaft and driven to rotate, and the other winding is rotationally driven by a variable speed drive machine provided separately from the variable rotation speed shaft, In a two-shaft drive differential shaft power generator configured to differentially control the rotational speed of one winding with respect to the rotational speed of the other winding, detecting the rotational speed of the field winding and the armature winding. A frequency control system for a two-shaft drive differential shaft power generator, characterized in that the rotation speed of the one winding is controlled so as to compare these rotation speeds and keep the relative rotation speed constant. (2) In the frequency control method according to claim 1, the variable speed drive machine is composed of a hydraulic motor driven by a hydraulic pump coupled to a variable rotation speed shaft, and the field winding and the armature winding A two-shaft drive differential type shaft generator configured to input a line rotation speed detection signal to a speed governor and output a control signal for adjusting the swash plate angle of the hydraulic pump/hydraulic motor by the speed governor. Equipment frequency control method. (3) In the frequency control method according to claim 2, an auxiliary controller is provided that predicts and calculates a predictable change in the rotation speed of the field winding or armature winding, and the output of the auxiliary controller is A frequency control method for a two-shaft drive differential shaft generator configured to add a signal to the speed governor to prevent fluctuations in the output frequency.