JPH07305330A - Load adjustment control method in dam type power plant - Google Patents

Abstract

PURPOSE:To deal with variation of a water level by combining detection of water level with flow adjustment control, and adding or subtracting a correcting flow corresponding to deviation of a water level to or from the set flow value of flow adjustment control so as to control a load. CONSTITUTION:When deviation between a set water level value V11 and an actual water level value V12 exceeds a dead zone V3, the interval correcting time of an interval correcting part 21 is set so as to output after the lapse of a decided time. Next a flow value to be corrected in this case is set as a correcting flow value V21. Next when the state of a water level over the dead zone V3 is continued over the set correcting interval time, the correcting flow value V21 is output to a correcting part 22. When deviation between the water level values 11, 12 is positive, the correcting flow value V21 is added, and in case of negative, it is subtracred and output to an computing element 23. Further, the value computed for flow correction out of the value of a set flow memory part 25 and a computed correcting flow value is sent to the memory part 25, so as to renew the set flow value. Hereby, the flow value can be automatically renewed according to a water level, and a water-wheel generator can be stably operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load adjustment control system for controlling a load of a generator in a dam type power plant.

[0002]

2. Description of the Related Art In a dam-type power plant dependent on agricultural water, the power output is limited by the amount of water required for agriculture.
The amount of water overflowing from the dam can also be used for power generation during the snowmelt season and the rainy season. However, power generation is required so that the dam water level is constant with respect to the set water level.

The following method has been conventionally used for a general load adjustment control system of a hydraulic power plant. 1) Flow rate control system As shown in FIG. 2, this system has a set flow rate value V1 set by the flow rate setting unit 1 and an actual flow rate value V from the flow meter 2.
2 is compared with the comparator 3, and the set flow rate value V1 and the actual flow rate value V
When the difference from 2 changes by a value exceeding the dead zone V3 set by the dead zone setting means (not shown), the output value is calculated by the output calculation section 4 according to the change amount, and the control output increase signal V4 or The control output decrease signal V5 is the load limiter 5
The load control device 5 adjusts the load of the turbine generator by the operation of increasing or decreasing the opening degree of the load limiting device 5 to adjust the flow rate of the generator flowing into the turbine to the set flow rate value. This system is a control system that is widely used as a load adjusting device for power plants in multipurpose dams.

2) Water Level Adjustment Control System As shown in FIG. 3, this system compares the flow rate water level V11 set by the water level setting section 11 with the actual water level V12 from the water level gauge 12 by the comparator 13. It is detected whether the actual water level V12 has changed by a value exceeding the dead zone V13 with respect to the set water level V11. When the dead zone V13 is exceeded,
Similar to the system of FIG. 2, the output value is calculated by the output calculation unit 14, and the control output increase signal V14 or the control output decrease signal V15 is supplied to the load limiting device 15 to increase or decrease the opening degree of the load limiting device 15. Then, by the operation of adjusting the flow rate flowing into the turbine of the generator, the load adjustment control of the turbine generator is performed depending on the water level. This control system is often used as a load adjusting device for a hydroelectric power plant.

[0005]

[Problems to be Solved by the Invention]

The flow rate adjustment control system of 1) operates the water turbine generator that effectively uses water resources unless the set flow rate value is changed each time when the own flow changes and the dam water level changes. Is impossible.

The water level adjusting control system of 2) is not a problem as a load adjusting device for a hydroelectric power plant,
There are the following problems when adopted in a dam-type power plant. That is, when the water level fluctuates, as is clear from the block diagram of FIG. 3, the load limiting device 15 is opened / closed by the load adjustment output due to the deviation to increase / decrease the output of the turbine generator. Even though the change in the water level of the dam depends on the size of the dam, it is generally very slow, so the speed at which the feedback amount of the actual water level changes is also very slow, and overloading of the load adjustment control occurs and it is put to practical use. It is often impossible.

An object of the present invention is that in a water level adjustment control system for a dam-type power plant, the speed at which the feedback amount of the actual water level change accompanying the load adjustment control operation changes is very slow,
Load adjustment by the water level of the dam-type power plant to prevent overshooting of the load adjustment control and to maintain a stable dam water level when the flow changes and to obtain a stable output of the turbine generator according to the dam water level. It is to provide a control system.

[0008]

In order to achieve the above object, a load adjustment control system in a dam type power plant of the present invention is a load adjustment control system for performing output adjustment control in a dam type power plant. A flow rate adjustment control unit that compares the actual flow rate with the set flow rate and controls the output of the generator,
The actual water level value is compared with the set water level value, and a calculation unit for calculating a flow rate correction value according to the deviation is provided, and the set flow rate is automatically updated according to the flow rate correction value obtained by this calculation unit. By doing so, the dam water level is controlled so that the generator output according to the actual water level is maintained while maintaining the set water level.

The calculation unit outputs an output when the deviation of the actual water level value from the set water level value exceeds a predetermined dead zone for a predetermined period of time, and an interval correction unit. A correction unit that adds or subtracts a corrected flow rate value determined according to the output of the unit according to the positive or negative of the deviation, and a set flow rate storage unit that stores the flow rate value corrected based on the output of the correction unit. It is characterized by that.

[0010]

In other words, the load adjustment control system of the present invention has a flow rate adjustment control for controlling the output of the generator by comparing and calculating the actual flow rate with respect to the set flow rate in order to perform the output adjustment control in the dam type power plant. The water level that controls the actual dam water level relative to the water level and automatically updates the flow rate of the flow rate adjustment control according to the actual dam water level to control the generator output according to the dam water level while maintaining the dam water level at the set water level. This is a system that combines adjustment control.

In particular, a dam-type power plant, unlike a water-channel power plant, has an operating water level that is not limited to one point but changes to a variable water level. However, the system of the present invention can perform a wide range water level setting water level adjustment operation. It has the features that can.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram for explaining a load adjustment control method in a dam-type power plant according to an embodiment of the present invention.

This load adjustment control system includes both the flow rate control system shown in FIG. 2 and the water level adjustment control system shown in FIG. That is, the water level control system includes a water level setting unit 11 for setting the set water level V11, a water level detector 12 for measuring the actual water level V12, and a water level detecting unit including the comparator 3, and a set flow rate V1. A flow rate setting unit 1, a flow rate meter 2 for detecting the actual flow rate V2, and a flow rate detection unit including a comparator 13 are provided. Then, the output of the comparator 3 of the water level detection unit is supplied to one input end of the comparator 13 of the flow rate setting unit via the switch S1-1 after being subjected to predetermined arithmetic processing in the arithmetic unit 20 described later. It is supposed to be done.

The switch S1-1 is a switch that can be manually switched alternately with the switch S1-2 inserted between the output end of the flow rate setting unit 1 and the input end of the comparator 13.
The signal of the calculation unit 20 is supplied to the comparator 13 when the switch S1-1 is ON, and the set flow rate value is supplied to the comparator 13 when the switch S1-2 is ON.

As in the case of FIG. 3, it is detected whether the output of the comparator 13 has changed by a value exceeding the dead zone V13, and when it exceeds the dead zone V13, the output calculation unit 14
The output value is calculated by, and the control output increase signal V14 or the control output decrease signal V15 is supplied to the load limiting device 15, and the opening degree of the load limiting device 15 is increased or decreased to set the flow rate flowing into the turbine of the generator. With the operation of adjusting to the flow rate value,
Adjustment control of the load of the turbine generator is performed.

Therefore, if the switch S1-2 is turned on and the switch S1-1 is turned off, the load limiting device 15 is operated according to the operation of only the flow rate setting unit regardless of the operation of the water level detecting unit and the calculating unit 20. It is possible to select the operation mode of controlling.

Next, the arithmetic unit 20 will be described. The calculation unit 20 sets the correction time interval when the output value of the comparator 3 exceeds the dead zone V3.
1 and preset water level V11,
Correction amount adder 2 for adding a correction amount to a preset correction flow rate value V21 when the output value of the comparator 3 is positive
2a and a correction amount subtraction unit 22b that subtracts the correction amount when the output value of the comparator 3 is negative,
It has and.

The output of the correction unit 22 is supplied to the comparator 13 via the arithmetic unit 23, the limiter 24, and the set flow rate storage unit 25 and the switch S1-1. Now, when the switch S1-2 is switched to the switch S1-1, the actual flow rate value V12 measured by the flow meter 2 of the flow rate detection unit is measured.
Is also supplied to the memory 26 of the arithmetic unit 20 via the switch S2-2 under the control of the controller 27, and this data is output to the set flow rate storage unit 25 via the limiter 24. Are compared and driven.

The output from the controller 27 outputs the switch S2-2 to 1 when the execution of the water level adjusting operation is selected.
The operation is performed so that only the scan is turned on and then returned, and the set flow rate storage unit 25 stores the actual flow rate value at the time of this switching. The subsequent operation is exactly the same as that of the flow rate adjustment control system.

In the load adjustment control system of the present invention, prior to actual operation, the set water level value V11 and the actual water level value V12 are set.
When the deviation of exceeds the dead zone, the output is not immediately output,
The interval time of the interval correction unit 21 is set such that the preset time is output after the elapse. Further, the flow rate value to be corrected when the deviation between the set water level value V11 and the actual water level V12 exceeds the dead zone is set in advance as the corrected flow rate value V21. It is assumed that the switch S1-1 is ON and the switch S1-2 is OFF.

In this state, the water level changes beyond the dead zone V3, and when this state continues beyond the set correction interval time, the preset correction flow rate value V21 is output to the correction section 22. Set water level value V11 and actual water level value V
When the deviation of 12 is positive, this correction flow rate is added, and when it is negative, the correction flow rate is subtracted, and the correction flow rate value as the result is output to the calculator 23 and calculated with the value of the set flow rate storage unit 25. The flow rate correction calculation is performed with the corrected flow rate value, the result is sent to the set flow rate storage unit 25, and the flow rate value stored at the start of the operation is updated. Then, the updated flow rate value is supplied to the comparator 13 via the switch S1-1.

Since this update operation is continuously performed at a predetermined interval, the flow rate value is always the set flow rate value after the actual water level change, and the load adjustment control is performed. The corrected flow rate value and the set flow rate update interval time are determined by the dam water storage table and the regulation of increase / decrease in discharge of dam management.

As described above, the load adjustment control system in the dam type power plant of the present invention is a load adjustment control system for performing the output adjustment control in the dam type power plant, and the actual flow rate is compared with the set flow rate. It is equipped with a flow rate adjustment control unit that calculates and controls the output of the generator, and a calculation unit that compares the actual water level value with the set water level value and calculates the flow rate correction value according to the deviation. By automatically updating the set flow rate in accordance with the obtained flow rate correction value, it is possible to control the dam water level so that the generator output according to the actual water level is maintained at the set water level.

The calculation unit outputs an output when the deviation of the actual water level value from the set water level value exceeds a predetermined dead zone for a predetermined period of time, and an interval correction unit. A correction unit that adds or subtracts a corrected flow rate value determined according to the output of the unit according to the positive or negative of the deviation, and a set flow rate storage unit that stores the flow rate value corrected based on the output of the correction unit. It is characterized by that.

[0025]

As described above, according to the flow rate adjustment control system of the present invention, by combining the water level detection and the flow rate adjustment control system, according to the displacement of the water level, depending on whether the deviation of the water level is positive or negative, The flow rate adjustment control is performed by adding or subtracting the corrected flow rate that can be determined by the dam water storage table to the set flow rate value of the flow rate adjustment control. Therefore, the flow rate value is automatically updated according to the water level of the dam, and as a result, it becomes possible to stably operate the water turbine generator while always keeping the water level of the dam constant.

[Brief description of drawings]

FIG. 1 is a block diagram showing a load adjustment control system in a dam-type power plant according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional flow rate adjustment control system.

FIG. 3 is a block diagram showing a conventional water level adjustment control system.

[Explanation of symbols]

 1 flow rate setting unit 2 flow meter 3 comparator 11 water level setting unit 12 water level meter 13 comparator 14 output calculation unit 15 load limiter 20 calculation unit 21 interval correction unit 22 correction unit 23 calculator 24 limiter 25 set flow storage unit

Claims (2)

[Claims] 1. A load adjustment control system for performing output adjustment control in a dam-type power plant, wherein a flow rate adjustment control unit that compares and calculates an actual flow rate with a set flow rate and controls the output of a generator, The actual water level value is compared with the set water level value, and a calculation unit for calculating a flow rate correction value according to the deviation is provided, and the set flow rate is automatically updated according to the flow rate correction value obtained by this calculation unit. By doing so, the load adjustment control method is characterized in that the generator water output is controlled according to the actual water level while maintaining the dam water level at the set water level. 2. The interval correction unit, which outputs an output when the deviation of the actual water level value from the set water level value exceeds a predetermined dead zone for more than a predetermined time, and the interval correction unit. A correction unit that adds or subtracts a corrected flow rate value determined according to the output of the unit according to the positive or negative of the deviation, and a set flow rate storage unit that stores the flow rate value corrected based on the output of the correction unit. Claim 1
The load adjustment control method described in.