JPH05231296A - Control device for water to be taken in - Google Patents

Abstract

PURPOSE:To prevent the rapid fluctuation of the output of a generator and to prevent deterioration of a load regulating mechanism, such as a guide vane, the load setter regulating circuit and the load setter itself of a governor by starting a plurality of generators so that a water level in a water tank equivalent to a water-intake amount does not enter the margin of a water level in the water tank equivalent to a vibration zone and distributing a load to each generator. CONSTITUTION:An amount of inflow water taken in through an intake is converted into an integrated output command value PT by means of a water-intake amount/ integrated output converting circuit 100. A load distributing circuit 110 predetermined the number of operating generators and distribution of an output value outputted by each running generator according to an integrated command value PT. A starting/ stopping circuit 120 outputs a starting and a stopping command for a generator according to a command for the number of operating generators inputted from the load distributing circuit 110. Signals, caused to follow an output command value for a generator according to which the actual output value of the generator is determined by the load distributing circuit 110, are outputted from No.1, No.2, and No.3 machine load following means circuits 50, 60, and 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water response control device installed in a hydroelectric power plant.

[0002]

2. Description of the Related Art Generally, water from a river is taken in from a water inlet, water is stored in a regulating pond having a relatively small capacity via a headrace, and the stored water is passed through a pressure tunnel and a water tank having a relatively small capacity. In a hydroelectric power plant that is guided by a turbine to generate electricity, if there are multiple generators, the number of generators operating depends on the water level of the regulating pond and water tank, and the generator output of the activated generator is Determined by the water level in the aquarium.

Further, the water turbine has a vibration band in which the rotation speed vibrates in a certain region. Therefore, the water response control device controls the output of the generator so as to avoid this vibration band. The equipment configuration diagram of the hydroelectric power plant will be described below with reference to FIG.

The water taken from the water intake 1 flows into the regulating basin 3 via the water conduit 2 and stores a fixed amount of water. The generators G1 to G3 are driven by the water flowing from the regulating pond 3 through the pressure tunnel 4 and the water tank 5, and the generator G1
The water that drives ~ G3 is discharged to the river through the discharge channel 6.

The adjusting pond 3 referred to here is for adjusting the water flowing from the river from the intake port 1 in terms of time in order to respond to daily load fluctuations. For example, the surplus water amount at midnight is stored and used during the daytime load peak.

Further, the water tank 5 is installed at the end of the pressure tunnel 4, detects the amount of water flowing into the water turbine from the change in the water level of the water tank 5, and outputs a generator according to this water amount. In addition, the amount of water that suddenly changes suddenly is absorbed and replenished so as not to damage the pressure tunnel 4 by the water hammer effect that occurs when the amount of inflowing water suddenly changes due to a sudden change in load at the power plant. As described above, the water-channel power plant is provided with a water response control device that operates a plurality of generators according to the amount of water flowing from the intake 1.
Hereinafter, a conventional water response control device for a hydroelectric power plant having three generators having unique vibration bands will be described with reference to the drawings.

From the lower water level to the higher water level of the regulating pond 3, the stop water level S1 and the starting water level M1 of the first generator (hereinafter referred to as the first generator), and the second generator (hereinafter referred to as the second generator).
Stop water level S2 and starting water level M2, stop water level S3 and starting water level M of the third generator (hereinafter referred to as "3rd generator")
3 is set. However, the first and second machines here
The 3rd machine shows the operation sequence to operate the generator,
Which generator is which number is preset.
In addition, the water level S of the start / stop water S
The activation permission water level M is set. FIG. 8 shows the relationship between the set water levels of the three generators and the set water levels of the water tank. The configuration of the conventional water response control device will be described with reference to FIG. The current water level of the regulating pond 3 is the regulating pond water level HWL, and the water tank 5
Let the water level of the tank be the water level SWL.

The start / stop control circuit 10 controls the water level HWL of the regulating pond to be equal to or higher than the start water level M1 when the entire machine is stopped and the water level L in the aquarium.
When 2 becomes the activation permission water level M or more, the activation command K1 of the first machine
Is output. Further, when the regulating pond water level HWL becomes the first stop water level S1 or lower and the aquarium water level SWL becomes the start stop water level S or lower, the first stop command T1 is output. Similarly, regarding the second and third machines, a start command and a stop command are output to the generators that satisfy the above conditions.

The first machine water condition output command value calculation circuit 20, the second machine water condition output command value calculation circuit 30, and the third machine water condition output command value calculation circuit 40 load the tank water level SWL according to the water level regulation rate. The output is calculated and output. Since the calculation method of each of the above circuits is the same, the first device water condition output command value calculation circuit 20 will be described here.

The No. 1 water condition output command value calculation circuit 20 inputs the signal of the water tank water level SWL, and according to a preset water level regulation ratio, the No. 1 generator output command value which is the generator output of the No. 1 device. Output PO1. The water level adjustment rate will be described with reference to FIG.

The reference water level L is set between the starting / stopping water level S and the starting permission water level M shown in FIG. 7, and generally has a width of about 30 to 50 cm. Here, 30
In the case of cm, the lowest water tank SW of the reference water level L
L is the reference water level L = 0, and the highest water tank water level SWL is the reference water level L = 100. The water level adjustment rate is the slope of the reference water level with respect to the generator output. When the water tank water level SWL is the reference water level L = 0, there is no load, and as the water tank water level SWL rises, the generator output also increases according to the water level adjustment rate. When the generator output is within the range of the vibration band lower limit output value L1 of the first machine and the vibration band upper limit output value H1 of the first machine, it is limited to the vibration band lower limit output value L1.

When the water level SWL of the water tank rises and rises to the reference water level L corresponding to the vibration band upper limit output value H1 of the No. 1 machine, the vibration band lower limit output value L1 of the No. 1 machine is released, The vibration band is avoided all at once, and the generator output increases again as the tank water level SWL rises in accordance with the water level regulation ratio, and the reference water level L = 100, and the generator output also becomes the full load. Also,
When the water tank water level SWL is the reference water level L = 100, the load becomes full load, and as the water tank water level SWL decreases, the generator output also decreases according to the water level adjustment rate. The generator output is the vibration band upper limit output value H1 of the first machine and the vibration band lower limit output value L of the first machine.
When it is within the range of 1, the vibration band upper limit output value H1 of No. 1 machine
Limited to.

Then, when the water level SWL of the water tank is lowered to the reference water level L corresponding to the vibration band lower limit output value L1 of the No. 1 machine, the vibration band upper limit output value H1 of the No. 1 machine, which has been restricted, is released, The vibration band is avoided all at once, and the generator output decreases again as the water tank water level SWL decreases in accordance with the water level regulation rate, and the reference water level L = 0 and the generator output also becomes unloaded. The No. 1 load follow-up circuit 50, the No. 2 load follow-up circuit 60, the No. 3 load follow-up circuit 70, and the calculation method of each circuit are the same, so the No. 1 load follow-up circuit 50 will be described here.

The No. 1 machine load follow-up circuit 50 adds the No. 1 machine output command value PO1 and the No. 1 machine actual output value P1 on condition that the No. 1 machine start command R1 is inputted, and the result is outputted. If the deviation output is negative, the No. 1 load reduction command D1 is output, and if the outputted deviation output is positive, the No. 1 load increase command U1 is output. In addition, regarding the conventional water response control device,
An explanation will be given with reference to a graph showing the relationship between the water level in the aquarium and the generator output. For easy understanding, rated output = 10 MW,
A description will be given of a case where a water turbine generator having a vibration band output of 4 to 6 MW has a water intake amount Q increased to 3 MW corresponding to the generator output. When the water intake Q is from the generator output equivalent to 3 MW to 4 MW equivalent, the aquarium water level rises from the generator output equivalent to 3 MW to 4 MW equivalent. Then, the generator outputs a generator output of 3 MW to 4 MW according to the water level regulation rate of FIG.

When the intake water amount Q becomes equal to or higher than the intake water amount Q corresponding to 4 MW of the generator output, the water tank water level rises above the water tank water level corresponding to 4 MW, but the generator output follows the vibration band according to the water level adjustment rate in FIG. Limited to 4 MW to avoid. And
When the water level of the aquarium is equivalent to 6 MW of the generator output, the output of the generator changes rapidly from the generator output of 4 MW to the generator output of 6 MW according to the water level regulation rate in Fig. 8.

However, the current water intake Q is 5 of the generator output.
Since the water intake Q is equivalent to MW, the water intake Q is smaller than the amount of water flowing into the turbine by 1 MW of the generator output, so the water level of the aquarium drops and the vibration band should be avoided according to the water level adjustment rate in Fig. 8. In addition, the tank water level drops to a tank water level equivalent to 4 MW of generator output.

When the water level of the water tank reaches a water level corresponding to the generator output of 4 MW, the output of the generator rapidly changes from the generator output of 6 MW to the generator output of 4 MW in accordance with the water level adjustment ratio of FIG. Since the current water intake is 5 MW equivalent to the generator output, the water intake is higher than the water flowing into the turbine by 1 MW equivalent to the generator output, so the tank water level rises.

Hereinafter, the water tank water level rises from the water tank water level equivalent to 4 MW of the generator output to the water tank water level equivalent to 6 MW of the generator output, and the water tank water level equivalent to 4 MW of the generator output from the water tank water level equivalent to 6 MW of the generator output. Descend to.

[0019]

As described above, since the conventional water response control device is configured, when the turbine generator has a vibration band, the water level of the water tank, that is, the amount of water flowing into the turbine is the above vibration. When it corresponds to a belt, the water level repeatedly changes between the water tank water level corresponding to the vibration band upper limit output value and the water tank water level corresponding to the vibration band lower limit output value. Therefore, the output of the generator suddenly fluctuates, which adversely affects the system.

Further, due to repeated load fluctuations,
This may cause deterioration of the load adjusting mechanism such as guide vanes and servo motors, the load adjuster increasing / decreasing circuit of the governor, and the load adjuster itself. Further, a sudden change in the water level of the aquarium may cause a trip of the main engine.

Therefore, an object of the present invention is to start a plurality of generators so that the water tank water level corresponding to the amount of water intake does not fall within the water tank water level width corresponding to the vibration zone, and to distribute the load to each generator. By preventing sudden changes in the output of the generator,
Prevents deterioration of the load adjusting mechanism such as guide vanes and servo motors, the load setter increase / decrease circuit of the governor, and the load setter itself.

[0022]

A water response control device of the present invention is a water response control device for controlling the number of operating generators in accordance with the amount of inflow water flowing from an intake to a regulating pond.
A flow rate / load conversion means for converting the amount of inflow water into a total load output value and the number of operating generators according to the total load output value are selected, and an output command value for output from each selected generator is calculated. Load distribution means for distributing, start / stop control means for outputting start and stop commands for each generator based on the number of operating generators obtained by the load distribution means, and output command value for the generator obtained by the load distribution means Load follow-up means for outputting a signal for making the actual output value follow the output command value of the generator obtained by the load distribution means, from the actual output value of the generator.

[0023]

Since the present invention is configured as described above, the amount of inflow water taken in from the water intake is converted into the total load output value by the flow rate / load conversion means. Then, the load distribution means determines the number of operating generators based on the total load output value, and determines the distribution of output values output by each of the operated generators. The total load output value is the total value of the output values assigned to the operating generators. Then, the start / stop control unit outputs the start and stop commands of the generator from the command of the operating number input from the load distribution unit. Further, the load follow-up means outputs a signal for causing the actual output value of the generator to follow the output command value of the generator obtained by the load distribution means.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A water response control device according to an embodiment of the present invention will be described below with reference to the drawings. In addition, here, the case of having three generators will be described.

The water intake / total load output conversion circuit 100 is
The amount Q of water intake from the intake 1 shown in 10 is shown in FIG.
It is converted into the total output command value PT according to the water intake amount / total load output characteristic shown in. Here, the amount Q of water taken from the water intake 1 is calculated from the opening degree of the valve provided at the water intake 1.

The load distribution circuit 110 selects the number of generators to be operated according to the input total output command value PT, and calculates and outputs the generator output of the selected generators. 1 as shown in the internal configuration diagram of
Unit output command value calculation circuit 111, Unit 2 output command value calculation circuit 112, Unit 3 output command value calculation circuit 113, 1 unit operation command circuit 114, 2 units operation command circuit 115, 3 units operation command circuit 1
It consists of 16. The No. 1, No. 2, No. 3, and No. 3 units referred to here indicate the operation sequence in which the generators are operated, and which generator is set in advance.

The following table is a distribution table of generators operating among the three generators and generator output of the generators operating according to the total output command value PT input to the load distribution circuit 110. This is shown and is preset for each model.

[0028]

[Table 1] FIG. 4 is a graph in which the horizontal axis indicates the total output command value PT and the vertical axis indicates the generator output value of each generator for easy understanding.

For example, when the total output command value PT is 3 MW, the 1-unit operation command circuit 114 outputs the ON signal of the 1-unit operation command X1 for operating one generator, and the 1st unit output command value calculation circuit 111 outputs the No. 1 output command value PO1 which makes the No. 1 generator output 3 MW.

In this case, the No. 2 output command value calculation circuit 11
2nd and 3rd machine output command value calculation circuit 113, 2 units operation command circuit
The output command value and the operation command are not output from any of the 115 and 3 unit operation command circuits 116, and the operation of the second and third machines is stopped.

When the total output command value PT is 6 MW, the ON signal of the two-unit operation command X2 for operating the two generators is output from the two-unit operation command circuit 115, and the No. 1 unit output command value is calculated. From the circuit 111, the generator output of No. 1 is 2 to less than 4 MW and the No. 1 output command value PO1 and the output of No. 2 output command value calculation circuit 112 is 2 to less than 2 to 4 MW.
The number output command value PO2 is output. However, (No. 1 output command value PO1) + (No. 2 output command value PO2) = 6MW
The values of the No. 1 output command value PO1 and the No. 2 output command value PO2 are set so that

In this case, the third unit output command value calculation circuit 11
No output command value or operation command is output from any of the 3, 1-device operation command circuit 114 and the 3-device operation command circuit 116, and the operation of the No. 3 machine is stopped.

When the total output command value PT is 9 MW, the ON signal of the two-device operation command X2 for operating the two generators is output from the two-device operation command circuit 115, and the first device output command value calculation is performed. From the circuit 111, the generator output of the No. 1 machine is the 6MW 1st machine output command value PO1 and No. 2 machine output command value calculation circuit 1
The generator output of No. 2 to No. 12 is 3MW No. 2 output command value P
O2 is output.

In this case, No. 3 output command value calculation circuit 11
No output command value or operation command is output from any of the 3, 1-device operation command circuit 114 and the 3-device operation command circuit 116, and the operation of the No. 3 machine is stopped.

When the total output command value PT is 11 MW, the ON signal of the two-unit operation command X2 for operating the two generators is output from the two-unit operation command circuit 115, and the first unit output command value calculation is performed. From the circuit 111 to the generator output of No. 1 machine, the 8MW No. 1 machine output command value PO1 and No. 2 machine output command value calculation circuit 1
The generator output of No. 2 to No. 12 is 3MW No. 2 output command value P
O2 is output.

In this case, the third unit output command value calculation circuit 11
No output command value or operation command is output from any of the 3, 1-device operation command circuit 114 and the 3-device operation command circuit 116, and the operation of the No. 3 machine is stopped.

When the total output command value PT is 15 MW, the ON signal of the two-unit operation command X2 for operating the two generators is output from the two-unit operation command circuit 115, and the first unit output command value calculation is performed. 6 to 10 MW from the output of generator No. 1 from circuit 111
No. 1 output command value PO1 and No. 2 output command value calculation circuit 112 output No. 2 output command value PO2 of less than 6-10 MW from the No. 2 generator output. However, (No. 1 output command value PO1) + (No. 2 output command value PO2) =
The No. 1 output command value PO1 and the No. 2 output command value PO2 are set to be 15 MW.

In this case, the third unit output command value calculation circuit 11
No output command value or operation command is output from any of the 3, 1-device operation command circuit 114 and the 3-device operation command circuit 116, and the operation of the No. 3 machine is stopped.

When the total output command value PT is 25 MW, the ON signal of the three-unit operation command X3 for operating the three generators is output from the three-unit operation command circuit 116, and the first unit output command value calculation is performed. 6.6 to 10 from the generator output of No. 1 machine from circuit 111
MW No. 1 output command value PO1 and No. 2 output command value calculation circuit 112 to No. 2 generator output command value PO2 from the No. 2 generator output, and No. 3 output command value calculation circuit From the generator output of the third generator from 113, the third output command value PO3 of 6.6 to 10 MW is output.

However, (No. 1 output command value PO1) + (2
Machine output command value PO2) + (3rd machine output command value PO3)
Set the values of the No. 1 output command value PO1, the No. 2 output command value PO2, and the No. 3 output command value PO3 so that = 25 MW. In this case, no operation command is output from either the one-device operation command circuit 114 or the three-device operation command circuit 116.

The start / stop control circuit 120 outputs the No. 1 start command K1 when the ON signal of the one-unit operation command X1 is input while the three generators are stopped, and the two-unit operation command is issued during the operation of one unit. X2
No. 2 start command K2 is input when the ON signal of 3 is input, and 3 is input when the ON signal of three unit operation command X3 is input during the operation of two units.
Outputs the machine start command K3.

During operation of the three units, O of the three unit operation command X2
When the FF signal is input, the No. 3 machine stop command T3 is input, and when the OFF signal of the two-device operation command X1 is input during the two-device operation, it is 3
As for the machine stop command T2, when the OFF signal of the machine operation command X1 is input during the operation of one machine, the machine stop command T1 is output. 1st machine load following circuit 50, 2nd machine load following circuit 60, 3
The device load tracking circuit 70, the calculation method of each circuit is the same,
Here, the No. 1 load following circuit 50 will be described.

The No. 1 machine load follow-up circuit 50 adds the No. 1 machine output command value PO1 and the No. 1 machine actual output value P1 on condition that the No. 1 machine start command R1 has been input, and the result is output. No. 1 load decrease command signal D1 when the deviation output is negative, and No. 1 load increase command signal U1 when the output deviation is positive
Is output. Further, the water response control device of the present embodiment will be described with reference to the graph of FIG. 5 showing the relationship between the water intake amount, the water tank water level, and the generator output.

For easy understanding, rated output = 10
In the turbine generator with MW and vibration band output = 4 to 6 MW, the case where the water intake Q increases from 3 MW corresponding to the generator output to 9 MW will be described. Water intake Q is 4 MW from 3 MW equivalent to generator output
Up to a considerable water intake Q, the tank water level rises from the generator output equivalent to 3 MW to the equivalent of 4 MW. And FIG.
According to the water level regulation rate of, the generator output of 3MW to 4MW is output from one generator.

When the amount Q of intake water becomes equal to or greater than the amount Q of intake water equivalent to 4 MW of the generator output, the operation of one to two generators is started. Both the value PO1 and the output command value PO2 for the second unit are 2 MW. Also, as the water intake Q increases from the generator output of 4 MW to 5 MW, the No. 1 output command values PO1 and 2
Both the unit output command value PO2 increases to 2.5 MW.

When the amount Q of water intake has increased from 5 MW corresponding to the output of the generator to 9 MW equivalent, the amount Q of water intake is equal to 8 of the output of the generator.
Up to MW equivalent, both No. 1 output command value PO1 and No. 2 output command value PO2 increased from 2.5 MW to 4 MW, and when water intake Q exceeds 8 MW equivalent to generator output, No. 1 output command value PO1 is 6 MW In addition, the output command value PO2 of the second machine becomes 2 MW. When the water intake Q increases to 9 MW corresponding to the generator output, the No. 1 output command value PO1 remains 6 MW and the No. 2 output command value PO2 increases from 2 MW to 3 MW.

From the above, according to the present embodiment, even when the water intake Q increases from the generator output of 3 MW to 5 MW,
When the No. 1 machine enters the vibration band, the No. 2 machine is also automatically started, and the number of generators is set to be two to perform the generator output commensurate with the water intake Q. Therefore, since the water level of the water tank does not change, it is possible to prevent the generator output from the generator from changing and adversely affecting the system.

Further, since the generator output does not increase and decrease frequently, deterioration of the load adjusting mechanism such as the guide vane and the servo motor, the load setter increasing / decreasing circuit of the governor, and the load setter itself is prevented.

Further, in the present embodiment, the relationship between the total generator output value and the generator output of each generator is preset by the load distribution circuit, but the vibration band upper limit and vibration band lower limit of each generator are preset. By doing so, the total generator output command value PT is automatically set to the first device output command value PO1 and the second device output command value PO.
It is also possible to distribute to the second and third machine output command values PO3. Further, in the present embodiment, the case where the number of generators is three has been described, but the number of generators other than three is also possible in the same manner as in the present embodiment.

[0050]

As described above, according to the present invention, when operating a plurality of generators having a vibration band, the generator output of the generator that operates each generator according to the amount of water intake is changed by the vibration of each generator. Since it is decided not to enter the zone, it is possible to prevent a sudden change in the output of the generator due to a sudden change in the water level of the aquarium, so there is no adverse effect on the system, or a guide vane or servo
It is possible to prevent the deterioration of the load adjusting mechanism such as a switch, the load setting device increasing / decreasing circuit of the governor, and the load setting device itself.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a water response control device according to an embodiment.

FIG. 2 is an internal configuration diagram of a load distribution circuit of the water response control device according to the present embodiment.

FIG. 3 is a water intake / total power generator characteristic diagram of the present embodiment.

FIG. 4 is a general generator output / each generator output characteristic diagram of the present embodiment.

FIG. 5 is an operation explanatory diagram of the water response control device according to the present embodiment.

FIG. 6 is a block diagram of a conventional water response control device.

FIG. 7 is an explanatory diagram of a start / stop water level of a conventional water response control device.

FIG. 8 is an explanatory diagram of a water level adjustment rate of a conventional water response control device.

FIG. 9 is an operation explanatory view of the conventional water response control device.

FIG. 10 is an overall configuration diagram of a hydrographic power station.

[Explanation of symbols]

1 ... Intake port, 2 ... Headrace channel, 3 ... Regulating pond, 4 ... Pressure tunnel, 5 ... Water tank, 6 ... Drainage channel, 10, 120 ... Start / stop control circuit, 20 ... No. 1 machine water condition output command value calculation Circuit, 30 ... No. 2 water condition output command value calculation circuit, 40 ... No. 3 water condition output command value calculation circuit, 50 ... No. 1 load follow circuit, 60 ... No. 2 load follow circuit, 70 ... No. 3 Machine load following circuit, 100 ... Water intake / total load output conversion circuit, 110 ... Load distribution circuit, 111 ... No. 1 output command value calculation circuit, 112 ... No. 2 output command value calculation circuit,
113 ... Unit 3 output command value calculation circuit, 114 ... 1 unit operation command circuit, 115 ... 2 unit operation command circuit, 116 ... 3 unit operation command circuit, S1, S2, S3 ... Stop water level, K1, K2, K3 ...
Starting water level, S ... Starting stop water level, M ... Starting permission water level, L ...
Standard water level, HWL ... adjusting pond water level, SWL ... aquarium water level, H
1, H2, H3 ... Vibration band upper limit output value, L1, L2, L3
... Lower limit output value of vibration band, PO1 ... Output command value of No. 1 machine, PO
2 ... No. 2 output command value, PO3 ... No. 3 output command value, T
1 ... 1st machine stop command, T2 ... 2nd machine stop command, T3 ... 3
No. machine stop command, K1 ... No. 1 machine start command, K2 ... No. 2 machine start command, K3 ... No. 3 machine start command, X1 ... One machine operation command,
X2 ... 2 unit operation command, X3 ... 3 unit operation command, PT ... Total output command value, U1 ... 1st machine load increase command, U2 ... 2nd machine load increase command, U3 ... 3rd machine load increase command, D1 ... 1st machine load reduction command, D2 ... 2nd machine load reduction command, D3 ... 3rd machine load reduction command, P1 ... 1st machine actual output value, P2 ... 2nd machine actual output value,
P3 ... No. 3 actual output value, R1 ... No. 1 start command, R2 ...
No. 2 start command, R3 ... No. 3 start command, Q ... Water intake.

Claims (1)

[Claims] 1. A water response control device for controlling the number of operating plural generators according to the inflow amount flowing into an adjustment pond from an intake port, and controlling the generator output commensurate with the inflow water amount. To a total load output value, a load for calculating and distributing an output command value output by each selected generator, and the number of operating generators according to the total load output value. Distribution means, start / stop control means for outputting start and stop commands of each generator based on the number of operating generators obtained by the load distribution means, output command value of the generator obtained by the load distribution means, and generator And a load follow-up means for outputting a signal for making the actual output value follow the output command value of the generator obtained by the load distribution means, from the actual output value.