JPS5824632B2 - Suishiya Pump Mataha Pump Suishyano Untenseigiyohouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a power plant that has a small-capacity intermediate reservoir between an upper power plant and a lower power plant that is shared by both power plants, and is capable of stabilizing the water level of the intermediate reservoir and Concerning a safe operation control method for a hydroelectric power plant.

In a hydroelectric power plant, a power station is constructed between an upper reservoir and a lower reservoir, and power generation or pumping operation is performed by utilizing the head or lift formed by the water level difference between the two reservoirs.

However, topographical or geological problems may make it difficult to construct a power plant in the required location, or the head or lift may be too high for single power analysis only.

In such a case, a small-capacity intermediate reservoir is installed at a point where the head or head is divided into two between the upper and lower reservoirs, and power plants are placed separately above and below the reservoir. By sharing the water in the intermediate reservoir, power generation or pumping operations are carried out.

A hydroelectric power plant with this type of structure has two power plants, an upper and a lower power plant, but through the water level of the intermediate reservoir, etc.
Since each power station influences the operation control of the hydraulic machines at the other power station, they are treated as one power station when operating in conjunction with the electric power system.

This is because the water storage capacity of the intermediate reservoir is small, so if the upper and lower power plants are operated independently without being connected to each other, the intermediate reservoir will run out of water at any time.

Therefore, the question of how best to control the operation of this type of hydroelectric power plant has become an important issue.

In particular, for pumped storage power plants with complex operation modes, this is an extremely important issue from the viewpoint of safety and economy.

For example, when a power generation command is received from a central power dispatch center, it is necessary to decide in what ratio the load should be distributed to the upper and lower power plants, taking into account safety and economic efficiency.

From a safety perspective, it is necessary to control when the intermediate reservoir fills and when it does not, and from an economic perspective, how to control the water level of the intermediate reservoir to ensure good operation expected in the future. Control is required to determine whether the system can continue.

The operational mode of a pumped storage power plant is complicated because it is necessary to fully consider this economic aspect. It is an important issue whether to determine and control the situation, and appropriate control has been desired.

The purpose of the present invention is to detect the water level of the intermediate reservoir, transmit this water level signal as a common control command to the hydraulic machines of the upper and lower power plants, and detect when the water level is out of a preset range. By changing the operating status of one of the hydraulic machines, the water level of the intermediate reservoir is maintained at the desired level for operation,
An object of the present invention is to provide a method for controlling the operation of a hydroelectric power plant, which allows each power plant to be operated safely and economically.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Figure 1 shows an overview of the waterway system of a hydroelectric power plant that shares an intermediate reservoir.An intermediate reservoir 3 is provided between the upper reservoir 1 and the lower reservoir 2, and upper and lower reservoirs are provided above and below, respectively. A power plant 4 and a lower power plant 5 are arranged separately.

The upper power plant 4 is connected to the upper reservoir 1 and the intermediate reservoir 3 by an inlet channel 6 and an outlet channel 8, respectively, and the lower power plant 5 is connected to the intermediate reservoir 3 by an inlet channel 7 and an outlet channel 9, respectively. and lower reservoir 2
The characteristic of the hydroelectric power plant system is that the upper and lower power plants are connected to the intermediate reservoir 3 through waterways 8 and 7, respectively, so they share the water there and The system is operated under a head or head H between the upper reservoir 1 and the lower water leak 2, which is divided into two halves, H1 and H2.

First, the upper power plant 4 and the lower power plant 5 are simultaneously performing pumping operation, and the upper power plant 4 has a pumping height of H1.
Under the pumping flow rate Qp+, and in the lower power plant 5, the pumping head H
2, the case where the pumps are operated in a state where the pumped water flow rate is QP2 will be explained.

When operating in a state where the relationship between each pumping flow rate is QPI>QP2, in the intermediate reservoir 3, △Q
The amount of water corresponding to p-Qp+-QP2 will be lost, and the water level X will fall with time.

In particular, since the intermediate reservoir 3 is small, the water level changes much faster than in a normal reservoir.

As shown in FIG. 2, the state of change in the water level of this intermediate reservoir 3 is detected by a water level detector 11 provided in the intermediate reservoir 3, and this water level is detected within a predetermined water level range X1 to X1.
X2 (Hereinafter, X1 to X2 will be referred to as the specified water level range.

) is determined.

When the water level is within the specified range, the comparator 17 connects the adder 13.1 that constitutes the operation control system of the upper and lower power stations 4 and 5, respectively.
The water level signal XA is transmitted to 5.

The prescribed water level ranges X, -X2 are determined in consideration of both safety and economy.

When the water level signal
The difference between the water levels y and Z detected by the water level detector 10 of the lower reservoir 2 and the water level detector 12 of the lower reservoir 2 and the water level X of the intermediate reservoir 3 is determined, and the respective water level differences (H+ = y
H2=z-x) is given as a control signal to the guide vane control device 14 of the upper power plant 4 and the guide vane control device 16 of the lower power plant 5, and the respective power plants 4 and 5 are controlled independently.

In the above-mentioned pumping operation, if the water level When the water level detector 1
A comparator 17 transmits the water level signal XB directly to the guide vane controllers 14 and 16.

Then, regardless of the water levels y and z of the upper reservoir 1 and the lower reservoir 2, one or both of the hydraulic machines of the power plants 4 and 5 are controlled.

As a result, the relationship between the amount of water pumped at each power station 4 and 5 is expressed as Qp s
> Qp 2 to Qp t < Qp 2 and each hydraulic machine is operated so that the water level of the intermediate reservoir 3 does not fall further.

Next, if the pumping flow rate relationship is Qp1<Qp2, the intermediate reservoir 3 will have an increase in water volume corresponding to ΔQp=Qp2 Qp+ per unit time, and the water level X will rise over time. It's going to happen.

Therefore, the water level X of the intermediate reservoir 3 is within the specified water level range
When the water level signal from the water level detector 11 exceeds the upper limit X1 of
transmits the water level signal
By controlling the guide vane opening degree of the hydraulic machine in one or both of the above, or by controlling the stoppage of the hydraulic machine in the lower power station 5, the relationship between the respective pumped water amounts can be
The state is changed from PI<QP2 to Qp1>Qp2 to prevent the water level of the intermediate reservoir 3 from rising further, and the equipment is operated in a safe and economical state.

Subsequently, power generation operations are carried out simultaneously at power stations 4 and 5. At power station 4, the amount of power generated is QTI under the head difference H1, and at power station 5, the amount of power generated is QTI under the head difference H2.
Let us consider the case where each water turbine is operated in the state of T2.

When the relationship between the flow rates of each power plant is QT1>QT2, the amount of water corresponding to ΔQT-QT1-QT2 increases per unit time in the intermediate reservoir 3, and the water level X rises with time.

Moreover, when the relationship between the respective power generation flow rates is QTI<QT2, on the contrary, the amount of water corresponding to ΔQT=QT2−QT+ per unit time is lost in the intermediate reservoir 3, and the water level X decreases with time.

In other words, even in the case of power generation operation in this way, as in the case of pumping operation described above, dangerous situations such as water overflow, water level that makes it impossible to continue economical operation, or water shortage can occur in the intermediate reservoir 3. It will also make you feel depressed.

Therefore, in such a case, the water level X of the intermediate reservoir 3 is transmitted as a common control signal When X leaves the specified water level range X1 to X2, the guide vane opening degree is controlled or the hydraulic machine is stopped in one or both of the hydraulic machines in each power plant based on the water level signal from the intermediate reservoir 3.

This prevents the water level X of the intermediate reservoir 3 from dropping to a state undesirable for operation, making it possible to perform safe and economical operation.

As explained above, according to the present invention, the water level of the small-capacity intermediate reservoir, which is located between the upper power plant and the lower power plant and is shared with each other, is maintained in a safe area. I can drive safely.

In addition, since the water level in the intermediate reservoir can be controlled to be within a preset range, for example, when switching operation modes, the previous operation can be specified to end at a water level suitable for the next operation control. It is also possible to set a water level range X1 to X2.

As a result, each power plant can operate efficiently and economically, and even after long periods of operation, the water level is maintained at approximately the desired specified position, so even after the hydraulic machinery has stopped, the required Hydraulic machinery can be operated at any time without any problems.

This means that even in cases such as pumped storage power plants, where the operation modes are complex and require particular coordination and maneuverability in equipment operation, the equipment can be operated without problems.
come.

[Brief explanation of drawings]

FIG. 1 is a waterway system diagram of a hydroelectric power plant having an intermediate reservoir to which the present invention is applied, and FIG. 2 is a block diagram illustrating the control method according to the present invention. 1-... Upper reservoir, 2... Lower reservoir, 3... Intermediate reservoir, 4... Upper power plant, 5... Lower side. Power plant, 10, 11, 12...
...Water level detector, 13゜15...Adder,
14, 16... Guide vane control device, 17.
... Comparator.

Claims (1)

[Claims] 1 A small-capacity intermediate reservoir that shares internal water is provided between the upper reservoir and the lower reservoir, an upper power plant is installed between the upper reservoir and the intermediate reservoir, and an upper power plant is installed between the intermediate reservoir and the lower reservoir. In a method of controlling a hydroelectric power plant having lower power plants, the water level signal of each of the reservoirs is detected, and when the water level signal of the intermediate reservoir is within a predetermined water level range, the water level signal of the upper reservoir is detected. from the water level signal and the water level signal of the intermediate reservoir,
The lower power plant is controlled based on the water level signal of the intermediate reservoir and the water level signal of the lower reservoir, and when the water level signal of the intermediate reservoir deviates from the specified water level range, the water level of the intermediate reservoir is controlled. A method for controlling the operation of a hydroelectric power plant, characterized in that the upper and lower power plants are each controlled based on a signal so that the water level of the intermediate reservoir returns to the specified water level range.