JPH01264535A - Method of controlling parallel operation of shaft generator - Google Patents

Abstract

PURPOSE:To improve the rapidity at the time of output sharing shift and the economy of a device by providing a frequency control function only in other generator, and conducting output sharing control by output controlling function provided only in a shaft generator. CONSTITUTION:In order to detect the output current I1 of a shaft generator, the output current i1 of a current transformer 24 is input to an I/V converter 25 to be converted to a voltage e3 having a suitable amplitude. This e3 and an output current set signal e4 are input to an output current detector 19, its differential voltage e is formed, which is input to a controller 7a for controlling the phase of a thyristor converter 4, thereby controlling the control angle of the converter 4 so that the e approaches zero. Accordingly, the output current I1 of the shaft generator can be arbitrarily controlled by suitably operating the amplitude of the signal e4. On the other hand, other generator is all the same as a conventional one including the frequency control function.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a silice inverter-type shaft power generator that generates power by once utilizing the shaft output of a main engine in a ship, and a shaft power generator driven by a turbine or an auxiliary engine. This invention relates to a method for controlling load sharing during parallel operation of generators.

``Conventional technology'' In modern ships, from the standpoint of energy conservation, the power required on board is achieved by using a silis inverter type shaft power generation device that generates power by temporarily utilizing the output of the main engine, and a turbine or auxiliary engine. In many cases, power is provided by parallel operation of engine-driven synchronous generators (hereinafter referred to as other generators). The synchronous generator 2 is driven directly or via a speed increaser by the main engine 1 that drives the propeller P of the ship, and the synchronous generator 2 is driven by the main engine 1 that drives the propeller P of the ship, and The output voltage is automatically adjusted by an automatic voltage regulator (hereinafter referred to as AVR) 3 provided in the circuit of the field winding 2a. The AC output of the synchronous generator 2 is exchanged into DC power by a converter 4, and after being smoothed through a smoothing axle 5, it is converted to AC power at a constant frequency by a passive syrisk inverter 6, and the reactive power component will be explained later. As shown in FIG. 2, it receives the supply from the electric power generator and outputs the active power to the bus 9 side. The converter 4 is configured as a silico converter,
It is controlled by a control device 7 together with an inverter 6 .

The above is the already well-known Sirisk inverter type shaft power generator (
This is an overview of the structure and operation of the shaft generator (hereinafter simply referred to as a shaft generator).To further explain FIG. 2, a load 16 is connected to the busbar 9 via a cutoff H15. Also,
On the other hand, a Tamami electric machine 10 is connected to the busbar 9 via a breaker 12, and is operated in parallel with the above-mentioned shaft generator.
Both devices supply the load 16 with active power distributed by load sharing control, which will be described later. In this case, the supply of reactive power to the load 16 and the above-mentioned thyrisk inverter 6 is performed by the Tami Electric Machine 10, and the voltage control of the bus bar 9 is performed by the AVR II provided in the circuit of the field 10a. is well known.

Conventionally, this load sharing control for parallel operation has been carried out by providing each of the machines with a frequency control function capable of setting an arbitrary frequency as described below, and appropriately manipulating the frequency setting values of both machines.

That is, as a frequency control function, the output frequency ft& of the shaft generator is detected by the F/V converter 17a, converted and outputted to a voltage signal eta of an appropriate magnitude, and this eta and the frequency setting signal eia are adjusted to the frequency. The differential voltage △el (=esB, -e2&) is input to the difference detector 18a, and this is input to the control device 7a that controls the phase control of the sirisk converter 4 so that ∆e21 approaches zero. , that is, the output frequency fL& is the frequency setting signal e2a.
The control angle α order of the sirisk converter 4 is controlled so that it approaches the set frequency f2 corresponding to . Furthermore, when Δea>0, αa is increased, and when Δea<O, aC is decreased. In addition, for Tamami Electric, the output frequency flb is converted to F/'V converter 17.
elb and the frequency setting signal e2i are input to the frequency difference detector 18b to obtain the difference voltage Δe.

("elb e2b)", input this to the start/stop controller 23 of the governor motor 22 of the turbine 20, convert it to an output signal of an appropriate size, and output it to the governor motor 22.
2 plus Δe1. The start/stop and rotational direction of the governor motor 22 is controlled so that the output frequency ftb approaches zero, that is, the output frequency ftb approaches the set frequency f2'b corresponding to the frequency setting signal ec.

More specifically, the governor motor 22 is controlled so that the control valve 21 is turned in the closing direction when Δe>0, and conversely in the opening direction when Δeb<.

Load sharing control (in other words, output sharing control) for parallel operation of both engines is conventionally carried out on ships by providing frequency control functions such as those explained above. As is often done between engine-driven and turbine-driven generators, by inputting frequency setting signals ea (fza) and ezb (f*b) to both machines and appropriately manipulating these values. I was going. Furthermore, this was done by increasing the setting value for increasing the load sharing amount, and lowering the setting value for decreasing the load sharing amount.

``Problem to be Solved by the Invention'' In the conventional example described above, since both devices were provided with a frequency control function, the cost required for this was excessive. Also,
Regarding the responsiveness of the output sharing control of both machines, the shaft generator has a turbine 20 and a generator 10 as in Tamami Electric.
It is extremely fast because there is no delay due to the moment of inertia of
Due to the large differences between the two machines, it was difficult to obtain satisfactory power sharing.

``Means for Solving the Problems'' The present invention focuses on the fact that there is a large difference in the response of the output sharing control of the two machines mentioned above, and the frequency control of the bus bar is performed on the one with the slower response speed, but compared to the conventional one. This is often done and is considered to be a good idea, for example, by relying only on the function of the frequency control v4 function of the electric generator, which is approximately the same as the response speed in parallel operation of generators driven by auxiliary engines. The frequency control function of the shaft generator is not required, and on the other hand, the output sharing control of both machines can be made cheaper by replacing the output control function provided only for the shaft generator, which has a faster response speed, that is, the frequency control function. It is possible to improve the stability and economical effects of output sharing control by activating the output control function composed of an output current detector and a current difference detector.

"Example" An example of the present invention is shown in FIG. 1, and will be described below. Note that the same parts as those in FIG. 2 already explained are given the same reference numerals, and the explanation will be omitted.

In order to detect the output current of the shaft generator, the second
The output current i of a current transformer of 4 is put into a 25 /
3 and the output current setting signal e4 are input to the output current difference detector 19 to create a difference voltage Δe<-e3 ea), which is input to the control device 7a that controls the phase control of the thyrisk converter 4. The control angle αC of the sirisk converter 4 is controlled so that Δe approaches zero, that is, the output current ■ approaches the set current value 2 corresponding to the output current setting signal e4. Furthermore, when Δe>0, control is made to increase αC to decrease , and conversely, when Δe<0, control is made to decrease αC to increase . Therefore, by suitably adjusting the magnitude of the output current setting signal e4, the output current (2) of the shaft generator can be arbitrarily controlled. As a result, the amount of output shared by both machines is determined first by the shaft generator, and the rest is shared by the other generators.

On the other hand, all other generators, including the frequency control function,
It is the same as that of the conventional example shown in the figure, and therefore its output frequency f□ is controlled in the same manner as in the conventional example described above. Since the shaft generator does not have a frequency control function like the conventional example, the frequency of the bus 9 is f. is controlled to approach the frequency setting signal f2b only by the frequency control function of the other generator.

Although the above description has been made regarding the case where a turbine-driven generator is used as the other generator, it goes without saying that the same can be said when an auxiliary engine-driven generator is used. Further, in the embodiment shown in FIG. 1, it is natural that the output control of the shaft generator can be performed on the amount of output current or on the amount of electric power.

"Effects of the Invention" As explained above, in the past, frequency control of the bus and output sharing control of both machines were carried out by using the frequency control function installed in each machine, but in the present invention, the frequency control function is Only the generator is controlled, the frequency control of the bus bar is controlled only by this other unit, and the output sharing control is performed only by the shaft generator. Since this is done by the function of , it is possible to improve the speed at which the output sharing is shifted and the economical effect of the device compared to the conventional system.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are block explanatory diagrams showing an embodiment of the present invention and a -ε- conventional example, respectively. 1- Main engine, 2.10- Synchronous generator, 3゜11... Automatic voltage regulator, 4... Cyrisk converter, 6... Cyrisk inverter, 7... Control Device, 16-Load, 17a, 17b-F/V converter, 1
8a, 18b... Frequency difference detector, 19... Output current difference detector, 20-... Turbine, 22... Governor morph, 23-- Start/stop controller, '24... Current transformer, 25 ...I/'V converter, 62a, e2b-
'Frequency setting signal, e4...-output current setting signal. VI: Shibona

Claims (1)

[Claims] A synchronous generator is driven directly or via a speed increaser from the ship's main engine shaft, which has rotational fluctuations, and the fluctuating frequency output of the synchronous generator is first converted to DC using a converter, and then converted to constant frequency AC using an inverter. As a method for parallel operation control of the output shaft generator and another generator, which is an auxiliary engine or turbine-driven synchronous generator, frequency control of the bus bar connecting the output terminals of these two machines is provided on the other generator side. This is performed only by the frequency control function, and the output sharing control between both machines is performed by preferentially controlling the output sharing amount on the shaft generator side by the output control function provided on the shaft generator side. A method for controlling parallel operation of a shaft generator, characterized in that: