JPH0749012Y2 - Turbine operation controller for hydroelectric power plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a water turbine operation control device in a hydroelectric power plant having a regulating pond and the like and having a long waterway.

(Prior art) Generally, in a hydroelectric power plant where there is a regulating pond etc. and the channel is long, if the turbine is immediately stopped under the condition that the regulating pond gate is fully closed, the water in the tank overflows. . For this reason, when performing automatic operation such as water response operation,
The water level adjuster adjusts the flow rate of the water turbine according to the water level in the tank, and the water turbine is operated until the water level reaches the stop level.

That is, FIG. 6 is a schematic configuration diagram of a water turbine operation control device using a general water level adjuster, in which the water level signal from the aquarium water level detector 2 is input to the water level adjuster 1. The water level adjuster 1 outputs a signal to the electric speed governor 3 according to the value of the water level signal until it matches the return value (feedback value) of the load limiter 4.
Then, the electric speed governor 3 adjusts the guide vane of the water turbine by the signal from the water level controller 1 to adjust the flow rate used. That is, when the water level is high, the flow rate is increased in the full load direction, and when the water level is low, the flow rate is decreased in the no load direction.

By the way, FIG. 7 is a diagram showing a water tank water level change and a stopped state of a water turbine when the generator is stopped by closing the gate of the regulating pond in a hydro-hydraulic power plant where two main engines are installed. The gate is closed, and when the water level of the water tank gradually decreases and the water level of the water tank reaches the unloaded water level, the trailing machine is stopped first. Then, since the used flow rate for one turbine disappears, the water level once rises but begins to fall again, and the preceding machine continues to operate until the stop water level is reached.

(Problems to be solved by the device) However, in a hydroelectric power plant with a long waterway, even if the gate of the regulating pond is closed to cut off the water, the water level in the water tank is large because the water in the waterway is large. It takes a long time before it becomes, and it takes a long time to stop the turbine. Therefore, for the turbine, there is a problem that a low load operation continues for a long time until the turbine stops, and mechanical problems such as vibration of the turbine occur.

In view of these points, the present invention is
An object of the present invention is to obtain a water turbine operation control device capable of automatically stopping the water wheel earlier and more when it is desired to fully close the gate of the regulating pond and stop a plurality of water wheels.

[Constitution of device]

(Means for Solving the Problem) The present invention has a water response control function for automatically starting and stopping a water turbine according to a preset water level in an aquarium, and a load adjustment for keeping the aquarium water level substantially constant. A water channel that has a function to adjust the water level, and during normal operation, starts and stops the turbine and adjusts the load according to the preset standard water levels of the water tank such as stop water level, start water level, and full load water level. In the water turbine operation control device of the power plant, an arithmetic unit was installed to correct the above stop water level set value to be considered as the full load water level when the power station was completely stopped and the gate of the regulating pond was fully closed. (Operation) When the gate of the regulating pond is closed when the power station is fully stopped, the set stop water level in the arithmetic unit is corrected to be regarded as the full load water level, on condition that the gate is fully closed. Therefore, when the water level of the water tank is equal to or higher than the stop water level during the normal operation, the water turbine is continuously operated under full load, and the water turbine is controlled so as to be completely stopped when the water level of the water tank gradually decreases and becomes equal to the stop water level. Then, the amount of water used after the gate was fully closed increased,
The water level of the water tank can be reduced quickly, and the time required to stop all the water turbines can be greatly shortened.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In FIG. 1, reference numeral 10 is a water turbine operation control device,
The turbine operation control device 10 is functionally divided into a water response control function unit and a water level adjustment function unit.

In the water response control function unit, a signal obtained by converting the aquarium water level signal H, which is the basic data for control, into a digital amount by the converter 11, and sequence conditions on the main engine side (for example, main engine operation, parallel, main engine failure, etc.), etc. Are input from the input / output device 12, and those signals are input to the arithmetic unit 13. In this arithmetic unit 13, a starting water level, a stopping water level, a fully loaded water level, an unloaded water level, etc. are preset as preset water levels as reference water levels of the water tank. Then, in the arithmetic unit 13, the operation / stop of the water turbine is determined based on the water level signal of the water tank, the sequence condition on the main engine side, the set water level, etc., and the turbine operation command after the determination is output from the input / output device 14. .

On the other hand, in the water level adjusting function unit, a changing aquarium water level data output from the conversion unit 11, a signal obtained by converting the load limit opening data that is the return value (feedback value) of the load into a digital amount by the converter 15, and The “gate fully closed” signals of the regulating pond are taken in by the input / output device 16, and those signals are input to the arithmetic device 17. Then, in this arithmetic unit 17, a load adjustment command signal is calculated based on the aquarium water level data and the stop water level set in the arithmetic unit 17, the starting water level, the total load water level, etc., and the load adjustment command signal is input / output. It is output to an electric speed governor (not shown) via the device 18.

By the way, the arithmetic unit 17 also has a function of correcting the stop water level during normal operation (set stop water level) as the full load water level under the condition that the gate of the regulating pond is fully closed. Then, the load adjustment command is the second as the water level adjustment function.
It is calculated according to the flow shown in the figure.

That is, while the turbine is in operation, the water level data from the water tank is constantly input from the water level detector (step A), and if the condition of the gate fully closed (step B) of the regulating pond is "NO", the water level adjustment during normal operation is continued. (Step C). On the other hand, if the condition of the regulating pond “gate fully closed” is satisfied, the stop position during normal operation is compared with the current water level (step D), and the stop water level during normal operation is corrected to the full load water level (step E). . In other words, the water level above the stop water level during normal operation is the full load water level. It should be noted that this full load water level is always corrected as to whether it is proper or not (step F).

Next, the full load water level is converted into a load value (flow rate value) (step G), and a load adjustment command is output to the electric speed governor via the input / output device 18 (step H). The opening data is input (step I), and the feedback control is continued until the full load position is reached (step J).

The above series of control is continued until the water level of the water tank reaches the stop water level (step K), and the correction of the full load water level is canceled (step M) under the water wheel stop condition (step L).

For example, Fig. 3 is a diagram showing changes in the water tank water level when the power plant is stopped. The water tank water level is the full load water level H _h during normal operation.
When the gate of the regulating pond is closed and all stops are in operation during the above operation, even if the tank water levels are compared at this point, the turbine operation continues at the full load water level because it is above the full load water level.

Next, even if the water level in the aquarium drops to H _m1 , it is still above the stop water level, and the output is made to reach the full load water level. When the water level in the aquarium further decreases to H _m2 , it is lower than the no-load water level during normal operation but higher than the stop water level, so it is output as the full load water level and the full load operation is performed until the stop water level H _l is reached. continue.

FIG. 4 is a diagram showing a characteristic in which the time t until the turbine is stopped is compared with the conventional one with respect to the decrease in the water level H of the aquarium, and is stopped earlier than the conventional one by a time of t ₁ -t _2. Will be done.

Fig. 5 shows the load (P) when the water level is adjusted.
It is a diagram comparing the characteristics, in the case of the conventional as shown in the figure,
Although the load (P) decreases and the operation becomes low, in the case of the present invention, the operation is continued until the water level decreases.

[Advantages of the Invention] Since the present invention is configured as described above, the flow rate used after the gate is fully closed can be increased as compared with the conventional one.
Even in a hydroelectric power plant where the waterway is long, the turbine will not stop for a long time, and low-load operation will not continue for a long time, which may cause mechanical troubles such as vibration. In other words, there is an effect that a smooth load operation becomes possible.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a hydraulic turbine operation control device of the present invention, and FIG.
Fig. 3 is a flow chart showing the operation during load adjustment, Fig. 3 is a diagram showing an example of water tank water level change at the time of stop, Fig. 4 is an explanatory diagram showing characteristics of water turbine stop time with respect to water tank water level drop, and Fig. 5 is load characteristic. FIG. 6 is a configuration diagram showing a general water level adjuster, and FIG. 7 is an explanatory diagram showing a change in water tank water level and a stopped state of a water turbine at a power station with two main engines. is there. 1 ... Water level adjuster, 2 ... Water tank water level detector, 3 ... Electric speed governor, 4 ... Load limiter, 10 ... Water turbine operation control device, 12, 14, 1
6,18 ... I / O device, 13,17 ... Arithmetic device.

Claims (1)

[Scope of utility model registration request] 1. A water response control function for automatically starting and stopping a water turbine according to a preset water level in a water tank, and a water level adjustment function for adjusting a load to keep the water level in the water tank substantially constant. , A water turbine operation control device for a hydroelectric power plant that performs start / stop and load adjustment according to each preset standard water level of the water tank such as stop water level, start water level, full load water level during normal operation At the time of full stoppage of the power plant, a hydraulic turbine operation control device characterized by being provided with an arithmetic unit for correcting the above-mentioned stop water level set value to be regarded as a full load water level on condition that the gate of the regulating pond is fully closed. .