JP2023064784A - Power generation output control method - Google Patents

Abstract

To provide a power generation output control method capable of maintaining power generation output of a pump inversion water wheel at a desired level without using a flowmeter.SOLUTION: The present invention relates to a power generation output control method in a case where power is generated by a pump inversion water wheel while controlling a flow rate of water taken in from a water intake gate provided in a dam and discharged to a downstream side of the dam at a desired level by means of the pump inversion water wheel. A power generation output control method 100A includes a power generation output recovery process 1 which is implemented in a case where power generation output of the pump inversion water wheel is less than a target value. The power generation output recovery process 1 includes a first step (step S01) of reducing a rotation speed of the pump inversion water wheel just by a desired level and a second step (step S02) which is implemented after the first step and in which it is confirmed whether or not the power generation output achieves the target value. The first step and the second step are repeated as a set until the power generation output achieves the target value.SELECTED DRAWING: Figure 2

Description

The present invention relates to a power generation output control method for maintaining a desired power generation output by a reverse pump water turbine.

In general, dams are controlled so that the flow rate when discharging water to the downstream side is desired. In addition, a reverse pump water turbine may be used to control the flow rate of discharged water and to generate power.
Normally, at dams, the main focus is on controlling the flow rate at the time of discharge, and power generation efficiency may not be emphasized so much. There is
Under such circumstances, when trying to improve the power generation efficiency of the reverse pump water turbine, it is desirable to install a flow meter in the water conduit. For these reasons, it was sometimes difficult to install a flow meter.
The following are known prior arts in technical fields related to the present invention.

Patent Document 1 discloses an invention related to a water amount control method for adjusting the amount of water flowing into a water turbine runner in relation to a Francis turbine, which is a reaction type water turbine, under the name of "a water amount control method for a Francis turbine."
A water flow control method for a Francis turbine, which is an invention disclosed in Patent Document 1, is a variable-speed power generator in which the turbine is a Francis type. It is characterized in that the rotation speed of the generator is controlled by a variable speed generator to adjust the amount of water flowing into the turbine runner.
Furthermore, in the water flow control method for the Francis turbine described above, the optimum rotation speed command value for the variable speed controller is generated as a function having a turbine characteristic function from the output signal of the water level detector and the flow rate command signal from the host controller. This is characterized in that the method is determined by the device.
According to the invention disclosed in Patent Document 1 as described above, the number of revolutions of the generator can be controlled over a wide range without requiring guide vanes and their opening/closing mechanisms and without causing a decrease in water turbine efficiency. It is possible to adjust the amount of water in the area.

Patent Document 2 discloses an invention related to a reverse pump water turbine power generation facility suitable for small-scale hydroelectric power generation under the name of "reverse pump water turbine power generation facility".
The reverse pump water turbine type power generation equipment disclosed in Patent Document 2 includes a reverse pump water turbine interposed in a pipeline connecting a water supply part and a water receiving part, and a main shaft of the reverse pump water turbine and a rotating shaft thereof. is connected to the generator, the flow rate detection means provided in the pipeline on the water supply side of the pump reverse rotation turbine, and the pipeline downstream from the pump reverse rotation turbine based on the flow rate detected by the flow rate detection means and a control means for controlling the rotation speed of the pump reversing water turbine so that the flow rate of the water is constant.
According to the invention disclosed in Patent Literature 2 as described above, it is possible to provide a pump reverse turbine type power generation facility capable of maintaining a constant flow rate on the water receiving side and performing highly efficient power generation.

Patent Document 3 discloses an invention related to a reverse pump water turbine power generation facility suitable for small-scale hydroelectric power generation under the name of "reverse pump water turbine power generation facility".
The reverse pump water turbine type power generation equipment disclosed in Patent Document 3 includes a reverse pump water turbine interposed in a pipeline connecting a water supply part and a water receiving part, and a main shaft of the reverse pump water turbine having a rotating shaft. A connected generator, a pressure detection means provided in a pipe line closer to the water-supplied portion than the pump reverse-rotation turbine, a flow rate detection means provided in the pipe line closer to the water-supplied portion than the pump reverse-rotation turbine, and at least Based on the pressure detected by the pressure detection means and the flow rate detected by the flow rate detection means, the estimated end pressure, which is the estimated pressure at the end of the water supply part, is calculated, and the pump is operated so that the estimated end pressure is constant. and a control means for controlling the rotation speed of the reversing water turbine.
According to the invention disclosed in Patent Literature 3 as described above, it is possible to provide a pump reverse turbine type power generation facility that can stabilize the pressure at the end on the water supply side.

Patent Literature 4 discloses an invention relating to a method and apparatus for micro-hydroelectric power generation using excess pressure under the title of "Method and apparatus for micro-hydroelectric power generation using surplus pressure".
The surplus pressure micro hydroelectric power generation method, which is an invention disclosed in Patent Document 4, uses the flow rate or pressure of water flowing through a pipeline in a water conveyance/transmission/distribution pipeline network as a control variable, and utilizes the surplus pressure associated with the control. A power generation method for hydroelectric power generation in which the opening degree control of the inlet valve installed on the upstream side of the hydroelectric power plant and the turbine rotation speed control of the hydroelectric power plant are independently performed to control the downstream side pipe of the hydroelectric power plant. It is characterized by controlling the controlled amount of water in the road to a target value.
According to the invention disclosed in Patent Document 4 as described above, while controlling the flow rate and pressure of water flowing through a pipeline in a water conveyance, water transmission, and distribution pipeline network to an arbitrary value, generated power obtained from surplus pressure can be maximized.

JP-A-9-47089 Japanese Patent Application Laid-Open No. 2004-360482 Japanese Patent Application Laid-Open No. 2004-360479 JP-A-2006-22745

In the case of the invention disclosed in the above-mentioned Patent Document 1, in order to exhibit the intended functions and effects, the turbine runner of the Francis turbine is designed to increase the flow rate by changing the rotation speed over a wide range without causing a decrease in the turbine efficiency η. It should have a variable characteristic.
In this case, if a hydroelectric power plant is to be newly installed, it is possible to easily prepare a water turbine runner having the characteristics described above. As a result, it was necessary to replace the water turbine for power generation, and there was a problem that the cost increased more than installing a new flow meter.

In the case of the invention disclosed in Patent Document 2 or Patent Document 3, a flow rate detection means (flow meter) is essential for controlling the rotation speed of the pump reverse turbine. There was a problem that the invention disclosed in No. 3 could not be implemented.

In the case of the invention disclosed in Patent Document 4, the measured values of the flow meter (26), the primary pressure gauge (28), and the secondary pressure gauge (29) are used as indices to control the opening of the water turbine inlet valve and to perform regeneration. Since it is configured to control the amount of water in the downstream pipeline of the hydraulic power plant to the target value by performing the water turbine rotation speed control of the hydraulic power plant via the inverter individually and independently, the flow meter or Must have a pressure gauge.
Therefore, there is a problem that the invention disclosed in Patent Document 4 cannot be implemented in a power generation facility that does not have these.

The present invention has been made in response to such conventional circumstances, and its object is to reduce the power output to a target value without using a flow meter when generating power while controlling the amount of water discharged from a dam using a reverse pump water turbine. To provide a power generation output control method capable of controlling such that

A power generation output control method, which is a first invention for solving the above problems, controls the flow rate of water taken in from a water intake gate provided in a dam and discharged to the downstream side of the dam by a reverse pump water turbine. , the power generation output control method when generating power by the pump reverse rotation turbine, comprising a power generation output recovery process that is performed when the power output of the pump reverse rotation turbine is below a target value, the power generation output recovery step being performed by the pump reverse rotation turbine. and a second step of checking whether or not the power output has reached the target value. It is characterized by repeating a set of the first step and the second step until the value is reached.
In the first invention configured as described above, the first step has the effect of increasing the flow rate of water flowing into the water turbine of the reverse pump water turbine by decreasing the rotation speed of the reverse pump water turbine by a desired amount. This has the effect of restoring the power output of the reverse pump water turbine so as to approach the target value. Moreover, the second step has the effect of confirming whether or not the power generation output by the reverse pump water turbine has recovered following the execution of the first step.
Therefore, the first invention is provided with a power generation output recovery process consisting of the above-described first step and second step, so that even if the power output of the reverse pump water turbine falls below the target value, the power output is automatically restored. It has the effect of restoring the target value.

A second invention is the first invention described above, wherein the power generation output recovery step issues an alarm when the rotation speed of the pump reverse rotation turbine reaches or approaches a preset set value. wherein the set value is the rotational speed at which the power generation output is the maximum allowable value.
The second invention configured as described above has the same effects as those of the first invention described above. Furthermore, in the third step constituting the power generation output recovery step in the second invention, an alarm is issued when the number of rotations of the reverse pump water turbine reaches or approaches a preset set value. have an effect.
In the present invention, the cause of the decrease in power generation output by the reverse pump water turbine is the decrease in the flow rate of water supplied to the reverse pump water turbine from the water intake gate provided in the dam. A decrease in the amount of water intake at the water intake gate is mainly due to partial blockage of the water intake gate due to dust or the like.
On the other hand, for some reason, the dust accumulation at the water intake gate may suddenly disappear. In this case, the amount of water flowing into the reverse pump turbine will rise sharply.
When the amount of water flowing into the reverse pump water turbine rises sharply, if the power output from the reverse pump water turbine exceeds the allowable maximum value, there is a concern that the generator and the reverse pump water turbine may malfunction. .
Therefore, according to the second invention, the power generation output recovery process includes the third step in addition to the first and second steps described above, thereby reducing the risk of causing the above-described problems. have.
In the second invention, "when the number of revolutions of the pump reverse rotation turbine approaches a preset value" is, for example, an alarm value preset separately from the preset value (set value>alarm value ) is set, and the number of revolutions of the pump reversing turbine after completing the first step becomes equal to or exceeds this alarm value. Alternatively, when the first step is performed one more time, the number of revolutions of the pump reversing water turbine may become equal to or exceed the set value.

A third aspect of the invention is the above-described first aspect, wherein the dam has three or more water intake gates with different installation positions in the vertical direction, and the number of revolutions of the pump reverse turbine is set in advance in the output recovery process. When the value reaches or approaches the set value, a water intake gate that can take water is selected from the water intake gates that are not taking water, and the water intake gate that is in use is switched to the newly selected water intake gate. , and the set value is the rotation speed of the reverse pump water turbine at which the power generation output reaches the maximum allowable value.
The third invention configured as described above has the same effects as those of the first invention described above.
Further, the third invention described above includes a water intake gate switching step in place of the third step in the second invention described above.
Further, in the water intake gate switching step in the third invention, when the number of rotations of the pump reverse rotation turbine reaches or approaches a preset value, water can be taken from the water intake gate during which water intake is stopped. It has the effect of selecting a gate and switching from the intake gate in use to the newly selected intake gate.
In this way, in the third invention, by shifting from the power generation output recovery process to the water intake gate switching process when necessary, the reduction in the amount of water intake caused by, for example, the water intake gate being covered with dust can be suddenly resolved for some reason. Reduces the risk of problems occurring in the generator and the reverse pump turbine due to a sudden increase in the amount of water flowing into the reverse pump turbine, causing the power output of the reverse pump turbine to exceed the allowable maximum value. It has the effect of

A fourth aspect of the invention is the above-described third aspect of the invention, characterized in that the power generation output recovery step and the water intake gate switching step are alternately repeated.
In the fourth invention having the above configuration, by alternately repeating the power generation output recovery process and the water intake gate switching process, the power output of the reverse pump water turbine exceeds the allowable maximum value, causing problems in the generator and the reverse pump water turbine. This has the effect of bringing the power output of the reverse pump water turbine closer to the target value while suitably reducing the risk.

A fifth aspect of the present invention is the above-described third or fourth aspect, wherein in the water intake gate switching step, a reference water level, which serves as a criterion for judging whether or not water can be taken at each water intake gate, is set for each water intake gate. a fourth step of judging and selecting an intake gate that is not taking in water and is capable of taking in water from the reference water level, the current water level of the dam, and the open/closed state of each of the intake gates; Based on the result of comparison between the comparison element detection value obtained from the comparison element detection unit installed at or near the water intake gate and the comparison element reference value, the priority of the water intake gate that is not taking water and is capable of taking water is determined, and this priority is determined. a fifth step of selecting a water intake gate to be newly used based on the ranking; a sixth step, performed after the fifth step, of issuing a development command to the water intake gate to be newly used; and a seventh step, performed simultaneously with or after the step, of issuing a closing command to the intake gate in use.
The fifth invention having the above configuration has the same action as the third or fourth invention described above. Furthermore, the fourth step in the water intake gate switching process of the fifth invention is based on the reference water level set for each water intake gate, the current water level of the dam, and the open/closed state of each water intake gate. It has the effect of judging and selecting the appropriate water intake gate.
In addition, the fifth step is to determine whether water intake is stopped and water intake is possible based on the comparison result between the comparison element detection value obtained from the comparison element detection unit provided at or near each water intake gate and the comparison element reference value. It has the effect of determining the order of priority of water intake gates and selecting a new water intake gate to be used based on this order of priority.
Furthermore, the sixth step has the effect of issuing an opening command to the water intake gate to be newly used and starting water intake from that water intake gate.
The seventh step has the effect of issuing a close command to the water intake gate that is in use to stop water intake from that water intake gate.
Therefore, according to the fifth aspect, it is possible to select the water intake gate whose comparison element detection value is closest to the comparison element reference value as a new water intake gate.

A sixth invention is the above fifth invention, wherein the comparison factor in the water intake gate switching process is the water temperature, and the water intake gate switching process is performed after the fifth step, and the individual water intake gates or their an eighth step of determining whether or not to use the water intake gate together based on the comparison result between the turbidity detection value obtained from the turbidity detection unit provided in the vicinity and the turbidity reference value, and after the eighth step and a ninth step of selecting a water intake gate that can be used in combination when it is determined in the eighth step that the water intake gate needs to be used together, and a sixth step performed after the ninth step. , is characterized by issuing an open command to all water intake gates used together.
The sixth invention configured as described above has the same action as the fifth invention described above. Furthermore, by specifying the water temperature as the comparison element in the water intake gate switching process of the sixth invention, in the fifth step of the water intake gate switching process, the water intake gate with the smallest water temperature difference from the water temperature reference value is given the highest priority. It has the effect of selecting as a high water intake gate.
In addition, the eighth step determines whether or not to use the water intake gate together based on the comparison result between the turbidity detection value obtained from the turbidity detection unit provided at or near the individual water intake gate and the turbidity reference value. It has the effect of
Furthermore, the ninth step has the effect of selecting a water intake gate that can be used in combination when it is determined in the previous eighth step that the water intake gate must be used in combination.
In addition, the sixth step, which is performed after the ninth step, has the effect of issuing an opening command to all the water intake gates used together, and starting water intake from these water intake gates.
Therefore, according to the sixth invention, the water temperature of the water taken in from the water intake gate after switching is brought closer to the water temperature reference value, and the turbidity is lowered.

According to the first invention as described above, when power is generated by the reverse pump turbine while the flow rate of water taken in from the water intake gate provided in the dam and discharged to the downstream side of the dam is controlled as desired by the reverse pump turbine. can be maintained at or near the target value.
In addition, since there is no need to install a flow meter in order to control the rotation speed of the pump reverse turbine, the power generation equipment can be simplified, and work such as maintenance and accuracy confirmation of the flow meter can be omitted.
Therefore, according to the first invention, it is possible to efficiently generate power using the existing power generation equipment provided with a reverse pump water turbine that does not have a flow meter in the flow path.

The second invention has the same effects as those of the first invention described above. Furthermore, according to the second invention, even if for some reason the decrease in the amount of water intake from the water intake gate in use suddenly disappears and the amount of water flowing into the water turbine of the reverse pump water turbine rises sharply, It is possible to reduce the risk of exceeding the maximum allowable power output in In this case, it is possible to preferably prevent troubles in the power generation equipment during power generation using the reverse pump water turbine.
As a result, according to the second invention, it is possible to efficiently generate power using the water flow flowing into the reverse pump water turbine while suppressing the occurrence of troubles in the power generation equipment.

The third invention has the same effects as those of the first invention described above. Furthermore, according to the third invention, when the dam has three or more water intake gates, and when it becomes impossible to restore the power generation output only by reducing the rotation speed of the pump reverse turbine, switching is performed. It is possible to automatically select the possible intake gates and switch the intake gates.
As a result, according to the third invention, the power generation output by the reverse pump water turbine reaches or approaches the target value more efficiently and for a longer period of time than when the water intake gate switching process is not included. can be maintained.

The fourth invention has the same effect as the third invention described above. Furthermore, according to the fourth invention, the power generation output by the reverse pump water turbine can be automatically maintained at or near the target value.
As a result, according to the fourth invention, it is possible to continuously and efficiently generate power using the reverse pump water turbine without increasing the cost of power generation equipment.

The fifth invention has the same effects as the fourth invention described above. Furthermore, according to the fifth aspect, the water taken in from the newly selected water intake gate can be made closer to the comparison element reference value.
In this case, for example, by selecting an element that is likely to affect the ecosystem downstream of the dam as a comparison element, the impact on the downstream side by switching the intake gate can be reduced from the perspective of the comparison element. be able to.
Therefore, according to the fifth invention, it is possible to increase the power generation efficiency of the power generation facility equipped with the reverse pump water turbine, while reducing the influence on the downstream side of the dam from the viewpoint of comparison factors.

The sixth invention has the same effects as the fifth invention described above. Furthermore, according to the sixth invention, when switching the water intake gate to obtain a sufficient water flow for power generation, it is possible to select the water intake gate whose water temperature is close to the reference value and whose turbidity is lower. .
In this case, when switching the water intake gate, the impact on the ecosystem and farmland downstream of the dam can be minimized.
Therefore, according to the sixth invention, the environment downstream of the dam can be considered as much as possible while increasing the efficiency of power generation by the power generation facility equipped with the reverse pump water turbine.

BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual diagram of the power generation equipment which is the implementation object of this invention. 4 is a flow chart of a power output recovery process in the power output control method according to the first embodiment of the present invention; 9 is a flow chart of a power generation output recovery process in a power generation output control method according to Embodiment 2 of the present invention. FIG. 9 is a flow chart of a water intake gate switching process in a power generation output control method according to Embodiment 2 of the present invention; FIG. 4 is a flow chart showing a procedure for monitoring the usage state of the water intake gate A; 4 is a flow chart showing a procedure for monitoring the usage state of the water intake gate B; 4 is a flow chart showing a procedure for monitoring the usage state of the water intake gate C; It is a flowchart which shows an example of the water intake gate priority determination process in step S05. FIG. 10 is a flow chart showing another modified example of the water intake gate switching process in the power generation output control method according to the second embodiment of the present invention; FIG. 10 is a flow chart for judging whether other water intake gates need to be used together when water is taken from water intake gate A. FIG. 10 is a flow chart for judging whether or not to use other water intake gates together when water is taken from water intake gate B. FIG. 10 is a flow chart for judging whether or not other water intake gates need to be used together when water is taken from water intake gate C. FIG. (a) A graph showing the relationship between the number of revolutions of a reverse pump water turbine and the dam water level in the power generation facility to which the present invention is applied, and (b) a graph showing the relationship between the output of the reverse pump water turbine and the dam water level.

A power generation output control method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 13. FIG.

First, prior to the description of the present invention, an outline of a power generation facility to which a power generation output control method according to the present invention is applied will be described with reference to FIGS. 1 and 13. FIG.
FIG. 1 is a conceptual diagram of power generation equipment to which the present invention is applied.
For example, as shown in FIG. 1, the power generation equipment 17, which is the target of the power generation output control method of the present invention, includes at least one water intake gate (for example, water intake gate A) provided in the dam 6 and a A reverse pump water wheel 11 is provided in a water conduit 9 that connects with a discharge pond 10 that is provided.
In addition, in the reverse pump water turbine 11 in the power generation equipment 17 as described above, the generator 12 is connected to the rotating shaft 11b of the water turbine 11a, and is configured to obtain a power generation output corresponding to the rotation speed of the rotating shaft 11b. there is
Furthermore, the power generation equipment 17 as described above includes a control unit 13 that controls the rotation speed of the rotating shaft 11b of the pump reverse rotation turbine 11. By controlling the rotation speed of the rotating shaft 11b with the control unit 13, the induction The flow rate of water flowing through the water channel 9 is controlled as desired.

Here, the flow rate control of the water conduit 9 using the reverse pump water turbine 11 in the power generation equipment 17 shown in FIG. 1 will be described with reference to FIG. 13 . In this specification, "the number of revolutions of the rotating shaft 11b of the reverse pump water turbine 11" is simply referred to as "the number of revolutions of the reverse pump water turbine 11".
FIG. 13(a) is a graph showing the relationship between the rotation speed of the reverse pump water turbine and the dam water level in the power generation facility to which the present invention is applied, and (b) shows the relationship between the output of the reverse pump water turbine and the dam water level. graph. Table 1 below is a table of numerical values forming the basis of the graphs of FIGS. 13(a) and 13(b). The values shown in FIGS. 13(a) and (b) and Table 1 below are examples for explaining the characteristics of the power generation equipment 17 to which the present invention is applied. It does not mean that the dam water level at , the number of revolutions of the pump reverse turbine 11, etc. will always be in the states shown in Table 1.

As is clear from the graph of FIG. 13( a ), in the power generation equipment 17 , the water level (L ₀ ) of the dam 6 and the rotation speed (N) of the reverse pump water turbine 11 are correlated. Furthermore, as is clear from the graph of FIG. 13(b), the water level (L ₀ ) of the dam 6 and the power generation output (output; W) of the reverse pump water turbine 11 are also correlated.

More specifically, the power output (W) by the reverse pump water turbine 11 in the power generation equipment 17, which is the object of implementation of the present invention, can be obtained by Equation 1 shown below.

<Formula 1>
[W: power generation output (J/s)] = [g: acceleration of gravity (m/ ^s2 )] x [Q: flow rate (kg/s)] x [H _e : effective head (m)] x [F: efficiency]
However, [H _e : effective head] = [H _a : total head] - [H _b : loss head]
[H _a : total head] = [L ₀ : dam water level] - [L ₁ : discharge pond water level]

See Fig. 1 for effective head (H _e ), total head (H _a ), head loss (H _b ), dam water level (L ₀ ), and discharge pond water level (L ₁ ).
Table 2 below summarizes the head loss (H _b ) and the efficiency (F) corresponding to the flow rate (Q) in the water conduit 9 of the power generating equipment 17 in the above equation 1. For convenience, the density of water is assumed to be 1×10 ³ (kg/m ³ ).

That is, in the power generation equipment 17 to which the present invention is applied, the flow rate (Q) of the water conduit 9 can be indirectly grasped from the power output (W) of the reverse pump water turbine 11 based on Equation 1 above.
Therefore, in the power generation equipment 17 to which the present invention is applied, as is apparent from Table 1 above, when the dam water level (L ₀ ) does not change, that is, when the dam water level (L ₀ ) is maintained at that position In order to increase the flow rate (Q) of the water conduit 9, the number of revolutions of the pump reversing water wheel 11 should be decreased.
On the other hand, if the dam water level (L ₀ ) does not change, the flow rate (Q) of the water conduit 9 can be decreased by increasing the rotation speed of the reverse pump water turbine 11 .
Therefore, in the power generation equipment 17, which is the object of implementation of the present invention, based on the measured value of the water level (L ₀ ) of the dam 6, the head loss (H _b ) and efficiency (F) shown in Table 2 above, and the above equation 1 , the flow rate (Q) in the conduit 9 can be controlled.
In the power generation equipment 17 to which the present invention is applied, the flow rate (Q) of the water conduit 9 can be indirectly monitored by monitoring the power output (W) of the reverse pump turbine 11 .

On the other hand, in the power generation equipment 17 as described above, when the water intake gate (for example, the water intake gate A etc.) for the water flow that drives the pump reverse turbine 11 is partially clogged with dust, the water intake gate is partially blocked. , the expected flow rate (Q) at that water level (L ₀ ) will not be obtained.
In this case, the power output (W) of the reverse pump water turbine 11 falls below the target value of the power output (W) expected at that water level (L ₀ ).
Furthermore, in this case, although there is no problem with the water level (L ₀ ) of the dam 6, not only is it impossible to supply the required flow rate (Q) to, for example, the discharge pond 10 downstream of the dam 6, but the water level ( L ₀ ), there is a problem that even the expected power output (W) cannot be obtained. The power generation output control method according to the present invention was invented in view of such circumstances.

A power generation output control method according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.
FIG. 2 is a flow chart of a power output recovery process in the power output control method according to the first embodiment of the present invention. The same parts as those shown in FIG. 1 are denoted by the same reference numerals, and the description of the configuration thereof is omitted.
In the power generation equipment 17 shown in FIG. 1, it is determined whether or not to take water from a water intake gate (for example, water intake gate A) provided in the dam 6, that is, whether or not to generate power by the reverse pump water turbine 11. A reference water level (for example, reference water level (L _A )) is set, and if the current water level (L ₀ ) of the dam is below the reference water level (for example, reference water level (L _A )), the water intake gate (for example, water intake gate A ) is not taken.
On the other hand, when the current water level (L ₀ ) of the dam exceeds the reference water level (eg reference water level ( _LA )), water is taken from the water intake gate (eg water intake gate A). That is, power is generated by the reverse pump water turbine 11 using water taken in from a water intake gate (for example, the water intake gate A).
In addition, in Example 1, the case where water is taken in from the water intake gate A provided in the dam 6 and electric power is generated will be described as an example.

In the power generation output recovery step 1 in the power generation output control method 100A according to the first embodiment, for example, as shown in FIG. L ₀ ) is equal to or higher than the reference water level (L _A ) for judging whether or not water can be taken from the water intake gate A (step S00).
In step S00, if the current water level (L ₀ ) of the dam 6 is equal to or higher than the reference water level (L _A ), an opening command is issued to the water intake gate A, and water intake from the water intake gate A is started. At the same time, power generation by the pump reverse rotation turbine 11 is started.

After that, it is confirmed whether or not the power output (W) of the generator 12 has reached the target value of the power output at the current water level (L ₀ ) of the dam 6, and the power output (W) has not reached the target value. In this case, a control signal for decreasing the rotation speed of the pump reverse rotation turbine 11 by a desired amount is issued from the control unit 13 to the pump rotation rotation turbine 11, and the rotation speed of the rotating shaft 11b of the pump reverse rotation turbine 11 is decreased (step S01). ).
In this case, as described above with reference to FIG. 13, the flow rate of the water supplied from the water intake gate A to the pump reverse rotation turbine 11 increases, thereby increasing the power generation output (W) of the pump reverse rotation turbine 11. Recover (rise).
Then, after this step S01, it is confirmed whether or not the power output (W) of the generator 12 has reached the target value at the current water level (L ₀ ) of the dam 6 (step S02), and the power output (W) is If the target value is not reached, the above steps S01 and S02 are repeated as a set until the power output (W) reaches the target value (not shown in FIG. 2).

Therefore, when the power generation output control method 100A according to the first embodiment includes the power generation output recovery process 1 having steps S01 and S02 as described above, the current water level (L ₀ ) of the dam is equal to or higher than the reference water level (L _A ). Despite the fact that the flow rate from the water intake gate A is below the flow rate expected when the water level (L ₀ ), even if the power generation output (W) of the pump reverse turbine 11 decreases, the flow rate The power generation output (W) in the reverse pump water turbine 11 can be recovered so as to approach the target value regardless of the measured value of the meter.
In this case, since it is not necessary to install a flow meter in the water conduit 9 of the power generation equipment 17, which is the object of the present invention, the cost required for investment in the power generation equipment 17 and the labor and cost required for its maintenance can be saved. can.

In addition, even though the current water level (L ₀ ) of the dam is equal to or higher than the reference water level ( _LA ), the flow rate from the intake gate A is less than the expected flow rate when the water level (L ₀ ) is a partial blockage of the water intake gate A mainly due to dust accumulation on the water intake gate A.
For some reason, the dust accumulation at the water intake gate A may suddenly disappear.
In this case, as the flow rate of water flowing into the pump reverse turbine 11 rises, the power output (W) of the pump reverse turbine 11 also rises sharply, and if the value exceeds the allowable upper limit, the pump There is a concern that the reversing water turbine 11 and the generator 12 may malfunction.
In view of such circumstances, the power output recovery step 1 of the power output control method 100A according to the first embodiment may further include step S03 as described below.

That is, as shown in FIG. 2, in the power output recovery step 1 of the power output control method 100A according to the first embodiment, the rotation speed of the reverse pump water turbine 11 is increased after step S01 and before step S02 is performed. (N) has reached a preset set value, and an alarm is issued when the rotation speed (N) of the reverse pump water turbine 11 has reached the preset set value. A step (step S03) may be provided (optional component).
The “preset value” in step S<b>03 described above is the rotation speed (N _max ) at which the power output (W) of the reverse pump water turbine 11 is allowed to be the maximum value.
In addition, in the above step S03, if an alarm is issued, for example, a recovery measure is taken such as removing the garbage hanging on the water intake gate A of the dam 6, and the necessary water is removed from the water intake gate A again. A flow of water is taken. As a result, the power generation by the pump reverse turbine 11 can be continued using the water taken from the water intake gate A.

When the power generation output recovery step 1 of the power generation output control method 100A according to the first embodiment includes step S03 in addition to steps S01 and S02 described above, the water intake gate A is intended to be covered with dust. It is possible to prevent malfunction of the reverse pump water turbine 11 and the generator 12 when the flow rate from the water intake gate A to the reverse reverse pump water turbine 11 rises sharply due to sudden cancellation.

If the dam 6 constituting the power generation facility 17 shown in FIG. If the power output (W) of the reverse pump turbine 11 cannot be expected to recover even if the power output recovery step 1 is performed in the power output control method 100A, the problem may be solved by switching to another water intake gate. In other words, the water intake from the water intake gate A that is partially blocked by dust is stopped, and the water intake is switched to the water intake gate B or the water intake gate C that is not covered with dust, so that the pump reverse turbine 11 can generate power. Power (W) may be restored.
Then, in step S03 constituting the power generation output recovery step 1 of the power generation output control method 100A according to the first embodiment, when the rotation speed of the reverse pump water turbine 11 reaches a preset value, another water intake A power generation output control method 100B according to the second embodiment includes a water intake gate switching step 2a for automatically switching to a gate (for example, water intake gate B or water intake gate C).

Here, a power generation output control method according to a second embodiment of the present invention will be described with reference to FIGS. 1 and 3 to 7. FIG.
FIG. 3 is a flow chart of a power generation output recovery process in a power generation output control method according to Embodiment 2 of the present invention. Moreover, FIG. 4 is a flow chart of the water intake gate switching step 2a in the power generation output control method according to the second embodiment of the present invention. The same parts as those shown in FIG. 1 or 2 are denoted by the same reference numerals, and descriptions of the configurations thereof are omitted.
In the power output control method 100B according to the second embodiment, as shown in FIG. 3, steps up to step S03 of the power output recovery process 1 are the same as up to step S03 of the power output recovery process 1 according to the first embodiment. .
Then, in the power generation output control method 100B according to the second embodiment, as shown in FIG. At this time, the process proceeds to the water intake gate switching step 2a shown in FIG.

In the water intake gate switching step 2a of the power generation output control method 100B according to the second embodiment, as shown in FIG. If there is a water intake gate that can take water, the water intake gate (single or plural) is selected (step S04).
If it is determined in step S04 that water intake is stopped and there is no water intake gate that can take water, it means that there is no new water intake gate that can be used, and an alarm is issued.
Also, monitoring of the usage state of each water intake gate is performed according to the flow shown in FIGS. 5 to 7, for example.

FIG. 5 is a flow chart showing the procedure for monitoring the usage state of the water intake gate A. As shown in FIG. FIG. 6 is a flow chart showing the procedure for monitoring the usage state of the water intake gate B. As shown in FIG. Furthermore, FIG. 7 is a flow chart showing the procedure for monitoring the usage state of the water intake gate C. As shown in FIG. The same parts as those shown in FIGS. 1 to 4 are denoted by the same reference numerals, and descriptions of their configurations are omitted.
Monitoring of the use state of the water intake gate A is carried out, for example, by a water intake gate A use state monitoring process _3A as shown in FIG.
More specifically, in this water intake gate A usage state monitoring step _3A , first, the current water level (L ₀ ) of the dam 6 is measured, and the controller 13 determines this water level (L ₀ ) as the reference water level of the water intake gate A. It is determined whether (L _A ) is exceeded.
Then, when the current water level (L ₀ ) of the dam 6 is lower than the reference water level (L _A ) of the water intake gate A, the water intake gate A is judged to be “water intake stopped/cannot be taken”, and the control unit 13 stored in
Further, when the current water level (L ₀ ) of the dam 6 exceeds the reference water level (LA ₎ of the water intake gate A, the open/closed state of the water intake gate A is further confirmed by the control unit 13, and the water intake gate A is fully closed. In this case, the water intake gate A is determined to be “water intake stopped/water intake possible”, and the information is stored in the control unit 13 .
On the other hand, when the current water level (L ₀ ) of the dam 6 exceeds the standard water level ( _LA ) of the intake gate A and the intake gate A is not fully closed, the intake gate A , and the information is stored in the control unit 13 .
The water intake gate A use state monitoring process _3A as shown in FIG. is stored.

Similarly, in the water intake gate B, the use state of the water intake gate B is monitored by the water intake gate B use state monitoring step _3B shown in FIG.
Further, the water intake gate C is similarly monitored by the water intake gate C usage state monitoring step _3C shown in FIG.

More _specifically , for example, in the power generation equipment ₁₇ shown in FIG. In step S04 in the water intake gate switching step 2a of the power generation output control method 100B, water intake gates B and C are selected as switchable water intake gates other than the water intake gate A.
On the other hand, in _the power generation facility _{17 shown} in FIG. If it is in use, in step S04, since there is no newly usable (switchable) water intake gate other than the water intake gate C, an alarm is issued.
Then, when an alarm is issued in step S04, for example, a worker takes a recovery measure such as removing the garbage hanging on the water intake gate C of the dam 6, and the necessary flow rate is again discharged from the water intake gate C. of water is withdrawn. As a result, the power generation by the pump reverse turbine 11 can be continued using the water taken from the water intake gate C.

Further, in step S05 after step S04, the priority of the water intake gates selected in step S04 is determined based on a predetermined standard, and the water intake gate with the highest priority is newly selected. This is the process of selecting the intake gate to be used.
The "predetermined criteria" for determining the priority order of the intake gates selected in step S04 is, for example, "preferentially use the intake gate located vertically above the dam 6". It is the standard. In this step S05, only one criterion for determining the priority of the water intake gates may be used, or a plurality of criteria may be used together. Other examples of the "predetermined criteria" will be described later in detail.

As an example of the "predetermined criteria", when the priority of the intake gates is determined based on the criterion of "prioritizing the intake gate located vertically higher in the dam 6", the priority is determined as follows.
For example, in the power generation facility 17 shown in FIG. 1, if the current water level (L ₀ ) of the dam 6 exceeds the reference water level (L _A ) and the water intake gate B and the water intake gate C are selected in step S04, In the subsequent step 05, the water intake gate B located vertically above the water intake gate C is selected as the water intake gate to be newly used.

Then, in step S06 after step S05, the controller 13 issues an open command to the newly used water intake gate (for example, water intake gate B) selected in step S05, and the newly used water intake gate ( For example, water intake from the water intake gate B) is started (see FIG. 4).

Further, in step S07 after step S06, a closing command is issued to the water intake gate in use (eg, water intake gate A) to stop water intake from the water intake gate in use (eg, water intake gate A). (see Figure 4).

Therefore, according to the power generation output control method 100B according to the second embodiment, when recovery of the power generation output (W) by the pump reverse rotation turbine 11 cannot be expected even if the power generation output recovery step 1 is performed (see FIG. 3), By shifting to the water intake gate switching step 2a shown in FIG. 4, it becomes possible to supply a sufficient flow rate of water to the reverse pump water turbine 11 from the new water intake gate.
In this case, power generation by the reverse pump water turbine 11 can be continued, so the power generation efficiency of the power generation equipment 17 can be improved.
Also, when the power generation output control method 100B according to the second embodiment is performed, there is no need to newly install a flow meter in the power generation equipment 17. Time and cost can be saved.

Furthermore, in the power output control method 100B according to the second embodiment, the power output recovery step 1 and the water intake gate switching step 2a may be alternately repeated (an optional component).
In this case, in the power generation equipment 17 shown in FIG. 1, the power output (W) of the reverse pump water turbine 11 can be continuously and efficiently kept close to the target value.

Next, a modification of the water intake gate switching step 2a in the power generation output control method 100B according to the second embodiment will be described with reference to FIGS. 4 and 8. FIG.
Another example of how to determine the priority of water intake gates that are stopped and capable of taking water in step S05 shown in FIG. 4 will be described.
In step 05, when determining the priority of water intake gates that are stopped and can take water, a comparison element detection unit (for example, a sensor) is provided in advance at or near each water intake gate, and from this comparison element detection unit The priority may be determined based on the resulting comparison element criteria (optional component).
Here, a detailed description will be given by taking as an example a case where water temperature is used as a comparison factor when determining the order of priority of water intake gates.

FIG. 8 is a flow chart showing an example of the water intake gate priority order determination process in step S05. The same parts as those shown in FIGS. 1 to 7 are denoted by the same reference numerals, and descriptions of their configurations are omitted.
If the water intake gates are prioritized, for example, based on water temperature measurements, the power generation facility 17 is drawn into each of the water intake gates A to C, or in the vicinity of each of the water intake gates A to C, from each water intake gate. Water temperature sensors 15A-15C are provided to measure water temperatures (T _A )-(T _C ) of water. Furthermore, the power generation equipment 17 has a reference water temperature (not shown) for measuring a reference water temperature (T ₀ ) that serves as a comparison standard when comparing the water temperatures (T _A ) to (T _C ) measured by the water temperature sensors 15A to 15C. It also has a sensor. The reference water temperature (T ₀ ) may be, for example, the water temperature near the water surface (water level (L ₀ )) in the dam 6, or the water temperature measured at a desired point upstream of the dam 6 after discharge. It may be set as desired according to the use of the water.

In this case, in the water intake gate priority order determination step 4 in step S05, as shown in FIG. 8, first, the reference water temperature (T ₀ ) is measured by a reference water temperature sensor (not shown) in the power generation equipment 17 (step S41). .
Simultaneously with or after this step S41, water temperatures (T _A ) to (T _C ) are measured by the water temperature sensors 15A to 15C at the respective water intake gates A to C (step S42).
After step S42, the controller 13 calculates the absolute values of the water temperature differences (D _A ) to (D _C ) based on the reference water temperature (T ₀ ) and the measured values of the water temperatures (T _A ) to (T _C ). (step S43).
After this step S43, the priority of the water intake gates A to C is determined in ascending order of water temperature difference (D _A ) to (D _C ), and this priority is stored in the control unit 13 (step S44).
In step S05, the above-described steps S41 to S44 constituting the water intake gate priority determination process 4 are repeated at desired intervals, and the latest priority is stored in the control unit 13. FIG.

Therefore, in step S05 of the water intake gate switching process 2a, the priority order of the water intake gates A to C can be determined by executing the water intake gate priority order determination process 4 as described above.
In this case, the priority of the water intake gates A to C is determined based on comparison with a comparison standard (for example, water temperature near the water surface of the dam 6), and a new water intake gate to be used is selected.
As a result, for example, in the intake gate priority determination step 4 as shown in FIG. can be selected as a water intake gate. As a result, when the water taken from the new water intake gate after the water intake gate switching is discharged to the downstream side of the dam 6, the influence of the water temperature (or the desired comparison factor) on the farmland and ecosystem can be reduced. can.
More specifically, if the temperature of the water supplied to farmland and ecosystems is significantly lower than normal, there is concern that problems such as a decline in yield will occur due to obstacles in the growth of crops, etc. By minimizing the decrease in the water temperature of the water discharged from the dam 6, it is possible to prevent the occurrence of the problems described above.
As a result, according to the power generation output control method 100B according to the second embodiment as described above, the power generation output (W) can be efficiently restored to the target value by the pump reverse rotation turbine 11 only by performing the power generation output recovery step 1. When it becomes impossible to switch the water intake gate, the power generation output (W) can be reliably recovered by selecting and switching the water intake gate that is most suitable for switching the water intake gate without relying on manual labor. Also, at that time, the influence on the downstream side of the dam 6 due to the switching of the water intake gate can be minimized.

In FIG. 8, water temperature is used as a comparison factor when determining the priority of water intake gates A to C. However, water turbidity and chromaticity can also be used as comparison factors other than water temperature. can also be adopted.
Also, in FIG. 8, the case where the measurement value by the comparison reference sensor is used as the comparison standard of the comparison element is described as an example. may be set as a constant reference value instead of the measured value. In this case, step S41 (comparison reference value measurement step) in the water intake gate priority order determination step 4 shown in FIG. 8 is omitted.

Alternatively, in step 05 of the water intake gate switching process 2a, the priority of the water intake gates A to C may be determined based on one type of comparison element as described above, but the water intake gates A to C may be determined based on a plurality of comparison elements. may be prioritized (optional component).
In this case, a sensor for detecting a different comparison element is installed in each of the water intake gates A to C constituting the power generation facility 17, and the water intake gate priority is determined as shown in FIG. 8 for each comparison element. Step 4 may be carried out to determine the priority of each comparison element, for example, giving a higher score in descending order of priority, and determining the priority of the water intake gate in descending order of the sum of the scores.

Further, when the water intake gate priority determination step 4 described above is carried out, there may be a plurality of water intake gates with the same priority. In this case, if the priority is the same, there is no particular problem in taking water from any water intake gate.
In this case, in order to narrow down the number of intake gates to be newly used to one, for example, a criterion such as prioritizing the intake gate located vertically above the dam 6 may be determined in advance.
Alternatively, the main cause of the decrease in the amount of water intake from the water intake gate currently in use is the partial clogging of the water intake gate due to the generation of dust on the water intake gate.
In this case, if the intake gate closest to the intake gate partially blocked by dust is selected, the garbage will easily move to the newly selected intake gate, and the newly selected intake gate will There is also the possibility that a decline in water intake will be more likely to occur. In view of this situation, when there are multiple intake gates with the same priority, selecting an intake gate located further away from the intake gate currently in use will reduce the amount of water intake from the new intake gate. In some cases, the decline can be made difficult to occur. Therefore, if there are a plurality of water intake gates with the same priority, it may be determined in advance that priority is given to the water intake gate located farther away from the water intake gate currently in use.
In either case, the water intake gate selected in step S05 of the water intake gate switching process 2a can be reliably narrowed down to one.
Alternatively, in step S05, if a plurality of intake gates with the same priority exist, an alarm may be issued, and when the alarm is issued, the intake gate to be used may be determined by a person. good.

Finally, another modified example of the water intake gate switching process according to the second embodiment will be described with reference to FIGS. 9 to 12. FIG.
In FIG. 4 above, the case where the priority of the water intake gates is determined based on one type of comparison element or a plurality of types of comparison elements in step S05 of the water intake gate switching process 2a is described as an example. It is also assumed that it is necessary to determine the priority of the comparison factors themselves that are considered when determining the priority of each.
Here, as an example of such a case, a new intake gate to be used is selected based on the water temperature, which is a comparison factor, and then the measured turbidity of the newly used intake gate (another comparison factor) A case will be described in which it is determined whether or not the water intake gate can be used alone.

FIG. 9 is a flow chart showing another modification of the water intake gate switching process in the power generation output control method according to the second embodiment of the present invention. The same parts as those shown in FIGS. 1 to 8 are denoted by the same reference numerals, and descriptions of their configurations are omitted.
Further, in the water intake gate switching process 2b as shown in FIG. 9, steps up to step S05 are the same as the water intake gate switching process 2a described above.
Then, when a water intake gate to be newly used is selected in step S05 of the water intake gate switching process 2b, the water turbidity of the selected water intake gate (or its vicinity) is measured in the next step S08. , whether or not the newly used intake gate can be used alone is determined based on the measured turbidity value.
When performing step S08, water turbidity is measured at each water intake gate (for example, water intake gates A to C). The result is stored in the control section 13 .

Here, a detailed description will be given of the step of judging whether or not the water intake gates need to be used together, which is carried out at the water intake gates A to C, with reference to FIGS. 10 to 12. FIG.
FIG. 10 is a flow chart for judging whether or not other water intake gates need to be used together when water is taken from the water intake gate A. In FIG. FIG. 11 is a flow chart for judging whether or not another water intake gate is necessary when water is taken from the water intake gate B. In FIG. Furthermore, FIG. 12 is a flow chart for judging whether or not other water intake gates need to be used together when water is taken from the water intake gate C. As shown in FIG. The same parts as those shown in FIGS. 1 to 9 are denoted by the same reference numerals, and descriptions of their configurations are omitted.
Further, when performing step 08 described above, each of the water intake gates A to C provided in the dam 6 in the power generation facility 17 is equipped with turbidity sensors 16A to 16C in the vicinity thereof.

In the water intake gate A combination necessity determination step _5A shown in FIG _. is measured, this measured value (E _A ) is compared in the control unit 13 with the turbidity reference value (E ₀ ) set in advance in the control unit 13, and the measured value (E _A ) becomes the turbidity reference If it is less than or equal to the value (E ₀ ), it is determined that intake gate A can be used alone. On the other hand, when the measured value (E _A ) exceeds the turbidity standard value (E ₀ ), it is determined that the water intake gate A cannot be used alone. That is, when water is taken from the water intake gate A, it is determined that other water intake gates must be used together.
10 is repeated every desired time (for example, every 5 _minutes or every 15 minutes), and the latest determination result is stored in the control unit 13. be done.

Similarly, for the water intake gate B, it is determined whether or not it is necessary to use other water intake gates when water is taken from the water intake gate B by the water intake gate B combination necessity determination step _5B shown in FIG. , the latest determination result is stored in the control unit 13 .
Furthermore, in the case of the water intake gate C, similarly, it is determined whether or not it is necessary to use other water intake gates when water is taken from the water intake gate C by the water intake gate C combination necessity determination step _5C shown in FIG. , the latest determination result is stored in the control unit 13 .

Therefore, in step S8 of the water intake gate switching step 2b, the water intake gate stored in the control unit 13 determines whether it is necessary to use other water intake gates when taking water from the water intake gate selected in the immediately preceding step S05. The determination is made based on the determination result of necessity of combined use.
Then, if it is determined in step S05 that the newly selected water intake gate can be used alone, an open command is issued to the newly used water intake gate ( Step S06), at the same time or after this, a closing command is issued to the water intake gate currently in use (step S07).

On the other hand, if it is determined in step S08 of the water intake gate switching process 2b that it is necessary to use another water intake gate when taking water from the new water intake gate, another water intake gate that can be used in combination is determined after step S08. A step S09-1 of selecting is performed.
This step S09-1 is the same as step S04 in the previous water intake gate switching process 2a and water intake gate switching process 2b.
That is, in step S09-1, the usage status of each water intake gate obtained by the usage status monitoring steps _3A to _3C of each water intake gate shown in FIGS. Based on the determination result of 1), an intake gate that is not in use and that can be used together is selected.
It should be noted that if it is not possible to select a water intake gate that can be used together in this step S09-1, for example, a warning is issued, and the new water intake gate selected in the previous step S05 is used alone, or It may be configured such that a person makes a decision as to whether to stop water intake.

Furthermore, when a plurality of water intake gates that can be used together are selected in the previous step S09-1, the priority of the water intake gates that can be used together is determined in the same manner as step S05 in the water intake gate switching process 2a or the water intake gate switching process 2b. The water intake gate having the highest priority may be selected as the water intake gate to be used together (step S09-2; optional component).

Then, in step S09-1, or in steps S09-1 and S9-2, if a new water intake gate and a water intake gate to be used together with this water intake gate are selected, a new water intake gate is selected in subsequent step S06'. An open command, more specifically a half-open command, is issued to both the water intake gate used and the water intake gate used in conjunction with this water intake gate.
Furthermore, at the same time as or after this step S06', a closing command is issued to the water intake gate currently in use (step S07).

Therefore, when the power generation output control method 100B according to the second embodiment as described above includes the water intake gate switching process 2b according to another modification as shown in FIG. The water discharged downstream of 6 can be made to have a water temperature close to the reference water temperature (T ₀ ) and a turbidity close to the turbidity reference value (E ₀ ).
Therefore, according to the power generation output control method 100B according to the second embodiment including the water intake gate switching process 2b according to another modified example, power generation by the pump reverse rotation water turbine 11 is greater than when the water intake gate switching process 2a is included. When switching the water intake gate to bring the output (W) closer to the target value, the water temperature and turbidity of the discharged water, that is, at least two comparative factors, should minimize the influence on the downstream side of the dam 6. can be done.

INDUSTRIAL APPLICABILITY As described above, the present invention is a power generation output control method capable of maintaining a desired power generation output by a reverse pump turbine without using a flow meter, and can be used in the technical field related to hydroelectric power generation facilities.

1... Power generation output recovery process 2a, 2b... Water intake gate switching process 3 _A ... Water intake gate A usage status monitoring process 3 _B ... Water intake gate B usage status monitoring process 3 _C ... Water intake gate C usage status monitoring process 4... Water intake gate priority Determining process 5 _A ... Water intake gate A combined necessity determination process 5 _B ... Water intake gate B combined necessity determination process 5 _C ... Water intake gate C combined necessity determination process 6 -- Dam 9 -- Conduit 10 -- Discharge pond 11 -- Pump reverse rotation Water wheel 11a Water wheel 11b Rotary shaft 12 Generator 13 Control unit 15A Water temperature sensor 15B Water temperature sensor 15C Water temperature sensor 16A Turbidity sensor 16B Turbidity sensor 16C Turbidity sensor 17 Power generation equipment 100A, 100B …Generation output control method A to C …Water intake gate

Claims (6)

A power generation output control method when power is generated by a reverse pump water turbine while controlling the flow rate of water taken in from a water intake gate provided in a dam and discharged downstream of the dam as desired, comprising:
A power generation output recovery step that is performed when the power generation output of the pump reverse rotation turbine is below a target value,
The power generation output recovery step includes:
a first step of reducing the speed of rotation of the pump reversing turbine by a desired amount;
a second step of confirming whether the power generation output has reached the target value, which is performed after the first step;
A power generation output control method, wherein the first step and the second step are repeated as a set until the power generation output reaches the target value. The power generation output recovery step includes:
a third step of issuing an alarm when the number of revolutions of the pump reversing water turbine reaches or approaches a preset set value;
2. The power generation output control method according to claim 1, wherein the set value is the rotational speed at which the power generation output is a maximum allowable value. The dam comprises three or more water intake gates with different installation positions in the vertical direction,
In the output recovery step, when the number of revolutions of the pump reverse-rotation water turbine reaches a preset value or approaches the predetermined value, select the water intake gate that can take water from the water intake gate that is not taking water. and moving to a water intake gate switching step of switching from the water intake gate in use to the newly selected water intake gate,
2. The power generation output control method according to claim 1, wherein the set value is the rotational speed at which the power generation output is a maximum allowable value. 4. The power generation output control method according to claim 3, wherein the power generation output recovery step and the water intake gate switching step are alternately repeated. The water intake gate switching step includes:
A reference water level that serves as a criterion for judging whether or not water can be taken in at the water intake gate is set for each of the water intake gates. and a fourth step of judging and selecting the water intake gate from which water can be taken;
Performed after the fourth step, based on the comparison result between the comparison element detection value obtained from the comparison element detection unit provided at or near each water intake gate and the comparison element reference value, while water intake is stopped and a fifth step of determining the order of priority of the water intake gates from which water can be taken, and selecting the water intake gate to be newly used based on the order of priority;
a sixth step, performed after the fifth step, of issuing an opening command to the water intake gate to be newly used;
and a seventh step, performed simultaneously with or after said sixth step, of issuing a closing command to said water intake gate that is in use. power generation output control method. The comparison element in the water intake gate switching process is water temperature,
The water intake gate switching step includes:
It is performed after the fifth step, and the water intake gate is used together based on the result of comparison between the turbidity detection value obtained from the turbidity detection unit provided at or near the individual water intake gate and the turbidity reference value. an eighth step of determining the necessity of
a ninth step, which is performed after the eighth step, and selects the water intake gate that can be used in combination when it is determined in the eighth step that the water intake gate needs to be used in combination;
6. The power generation output control method according to claim 5, wherein in said sixth step performed after said ninth step, an opening command is issued to all said water intake gates used together.

Images