JPH0442734A - Generator load sharing unit - Google Patents

Abstract

PURPOSE:To realize an optimal load sharing control without causing excessive overload on an S/G having system output variable with variation of the rotational speed of main machine by inputting the rotational number of main machine and judging system output from the S/G. CONSTITUTION:Rotational number of main machine is inputted at first to a load sharing unit 10 in order to operate S/G system output at that time. An S/G output KW and a D/G output KW are then inputted to the load sharing unit 10. Total load on board is then shared proportionally according to the S/G system output and a D/G rated output and output control of the S/G and D/G is performed based on an output from the load sharing unit 10. Consequently, power can be fed stably without causing overload of S/G even in a proportional output region.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Utilization Sharing] The present invention relates to a main engine drive shaft generator proportional output area load sharing device that is equipped with an S/G and other generators and performs automatic load sharing control.

[Prior Art] Due to advances in power electronics in recent years, many main engine drive shaft generators (S/G) use frequency conversion devices controlled by thyristors. This S/G is generally the main engine (M
/E) The system output (KW) changes depending on the rotation speed.

When the M/E that drives the S/G falls below a certain number of revolutions, it enters a proportional output region, and the output decreases according to the number of revolutions. Although this is well known, when an eddy current occurs in the proportional region, non-critical loads are stopped by priority shutdown.

[Problems to be Solved by the Invention] As described above, conventionally, when the S/G system output decreases and an eddy current occurs, priority is given to shutoff.

However, S/G operates in parallel with other generators such as D/G,
If there is a margin, unnecessary priority shutdown can be prevented by shifting the load to a location other than the S/G.

However, conventionally, a control method has not been adopted in which the M/E rotational speed is input to a load sharing device, an S/G system output corresponding to the rotational speed is calculated, and load sharing control is performed.

[Means for Solving the Problems] The technical means of the present invention is to input the main engine rotation speed and determine the system output of the S/G based on it.

FIG. 3 schematically shows the system output characteristics of the S/G that performs thyristor control. By inputting the S/G system output characteristics with respect to the main engine rotation speed as shown in Fig. 3 into the load sharing device, S/G can be uniquely adjusted depending on the main engine rotation speed.
G's system output can be determined.

[Embodiment] FIG. 1 shows the configuration of a system according to an embodiment of the present invention.

The conditions are parallel operation of one S/G and one D/G. In addition, the system output characteristics of S/G are as shown in Figure 4, and D
The rated output of /G is 100 OKW.

(1) First, the main engine rotational speed is input to the load sharing device 10, and the S/G system output at that time is calculated.

For example, when the main engine rotation speed is 70% rpm, the system output of the S/G is 750 KW in FIG. 4.

(2) Next, input the S/G output KWSD/G output KW to the load sharing device 10. For example, at this time, proportional load sharing control is performed, and the S/G output is KW-800 (KW) and the D/G output is KW-800 (KW).

The total load on the ship will be -800+800-1600 (KW).

■ However, at this time, the S/G was overloaded by 50KW. Assuming that the S/G system output is 750 KW and the D/G rated output is 100 OKW, if the total onboard load of 1,600 KW is proportionally distributed, then the S/G system output will be proportionally distributed by the output of the load sharing device 10 so that /G and D/G output control.

As described above, even in the proportional output region, stable load power supply is achieved without overloading the S/G.

FIG. 2 shows a flowchart of the above arithmetic processing.

The above operation (■) shown in step 2 is performed using the S/G as shown in Figure 4.
If so, M/E%rpm<0, and the S/G system output is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the device of the present invention, FIG. 2 is a flow diagram thereof, FIG. 3 is a system output characteristic diagram, and FIG. 4 is a load sharing characteristic diagram of the main generator. 10...Load Sharing Device Next, in step 3, the state (2) is determined, in step 4, the calculation of (2) is performed, and based on this, a judgment is made in step 5, and either 6.7 is selected. [Effects of the Invention] According to the present invention, it is possible to realize optimal load sharing control without unnecessarily overloading the S/G whose system output changes as the main engine rotational speed changes. .

Claims (1)

[Claims] A storage means for storing the system output characteristics of the main generator, a means for calculating the system output based on the stored characteristics by inputting the main engine rotation speed, and inputting the output KW of the main generator and another generator. 1. A load sharing device in a proportional output region of a generator, characterized in that the device is equipped with means for calculating the amount of load to be borne by each generator from the rated output of another generator and the main generator system output.