JPS63113183A - Control device for pelton turbine operation - Google Patents

Abstract

PURPOSE:To reduce the cost of power station facilities and improve the operation efficiency thereof by constituting a Pelton turbine in such a way that an input water quantity to the turbine is adjusted with a deflector and a discharge quantity from a power station is controlled with a needle valve, respectively independent of each other. CONSTITUTION:When a power line is out of order, for example, an input control device 5A controls the opening of a deflector 3 and reduces water supply to a Pelton turbine 1, thereby maintaining a proper water quantity. Also, a discharge control device 11A controls the opening of a needle valve 2 and maintains a required water quantity. When the fracture of the power line continues, the turbine 1 is put to an emergency stop and a main engine comes to stop completely. In this case, however, the needle valve 2 is adjusted to control a necessary discharge quantity. On the other hand, when the fracture has been eliminated, the number of revolutions of the turbine 1 is controlled with the deflector 3 interlocked with an input water quantity control device 5A and the needle valve 2 maintains the required discharge quantity. According to the aforesaid constitution of the operation control device, it becomes unnecessary to provide a water discharge mechanism and an overflow passage for a power station.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a Pelton water turbine operation control device that makes it possible to control the amount of input water and the amount of water discharged to a water turbine. [Prior Art] Fig. 4 shows a conventional Pelton water turbine. This is a configuration diagram showing the operation control device. In the figure, 1 is a water turbine, 2 is a needle valve for adjusting the amount of water input to the water turbine 1, and 3 is a valve that is connected to the water turbine 1 via the needle valve 2 when the water turbine 1 is stopped. 1 ton of input water supplied
4 is a link mechanism for making the position of the deflector 3 follow the position of the needle valve 2 during normal operation; 5 is a link mechanism for adjusting the amount of water input to the needle valve 2 and the water turbine at 10 rotations. , an input water flow control device equipped with a regulating means for adjusting the output, 6 is a control signal thereof, 1
T is a feedback signal that transmits the opening degree of the needle valve 1 to the input water flow control device 5, 7 is a signal for fully closing the deflector 3 in an emergency, 811'' is a water tank, and 9 is a signal that transfers water from the water tank 8 to the water wheel 1. 10/l'i water conduit for guiding the water to the water tank 8 through the needle valve 2, a discharge mechanism for supplying water in a quantity exceeding that of the water tank 8, 11 a discharge control device for controlling the discharge mechanism 10, and 12 a discharge control device thereof. The discharge control signal 13 is the spillway of the power plant.

Next, the operation will be explained. 1 ton water wheel - To operate it,
First, the opening degree of the needle valve 2 is adjusted by the input water amount control device 5. As a result, the amount of input water injected into the water turbine 1 is adjusted, and the rotation speed and output of the water turbine 10 are adjusted.

Next, the deflector 3 operates so that the water jet is gradually applied to the water turbine 1. On the other hand, when it is necessary to make the discharge amount of water introduced from the water tank 8 through the water conduit pipe 9 greater than the amount of water input to the water turbine 1, the discharge control device 11 controls the discharge mechanism 10 to open. and release water.

[Problem that the invention seeks to solve]

Since the conventional Pelton turbine operation control device is configured as described above, when it is necessary to discharge more water from the water tank 8 than the amount of water input to the turbine 1, the discharge mechanism 10 and the spillway 13 of the power plant There were problems such as the need to equip the power plant with electricity, which increased the construction cost of the power plant.

This invention was made in the ninth attempt to solve the above-mentioned problems, and it is possible to control the amount of discharged water independently from the control of the amount of input water to the water turbine, without the need for a special discharge mechanism as a power plant. The purpose of this study is to obtain a Pelton turbine operation control device that can perform the following operations.

[Means for solving problems]

The Pelton water turbine operation control device according to the present invention controls the rotation speed and output of the water turbine by adjusting the amount of water input to the water turbine with a deflector whose operation is controlled by the input water amount control device, and controls the rotation speed and output of the water turbine by controlling the input water amount by the discharge control device. The system is designed to adjust the amount of water discharged from the power plant by adjusting a needle valve whose operation is controlled.

[Effect]

The deflector in this invention operates to control the amount of water input to the water turbine, that is, the rotation speed and output of the water turbine, and the needle valve operates to adjust the amount of water discharged from the power plant.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 5A is an input water amount control device, which controls the deflector 3 using a control signal 12 and adjusts the amount of water input to the water turbine 1, thereby adjusting the number of rotations of the water turbine 10 and the output. 11A is a discharge control device that is almost the same as that shown in Fig. 4, but the difference from Fig. 4 is that the needle valve 2
is controlled by the control signal 13. Reference numeral 14 denotes a control signal for the deflector opening degree which is supplied from the discharge control device 11A to the sive deflector 3. This signal makes it possible to control the deflector to an appropriate opening degree according to the discharge amount by the needle valve 2. ing.

15 and 16Fi are feedback signals for feeding back the opening signal of the needle valve 2 and the opening signal of the deflector 3 to the discharge control device 1tA.

Note that other components that are the same as those shown in FIG. 4 are designated by the same reference numerals, and redundant explanation thereof will be omitted.

Figure 2 shows the electrical main circuit of a generator to which a water turbine equipped with this Pelton water turbine operation control device is directly connected.
21 is a synchronous generator directly connected to the main shaft of the water turbine 1; 22 is a generator breaker for connecting the generator 21 to the grid; and 23 is a main transformer for boosting the terminal voltage of the generator 21. , 24 is a power transmission line breaker for connecting the generator 21 to the grid at high voltage, 25 is the grid, and 26 is an internal circuit of the power plant.

Next, the operation will be explained in detail according to the state transition diagram shown in FIG.

Note that the circles in Figure 3 indicate the state of the system at each point in time, and the arrows indicate the content of the transition from each state to another. For example, 1p is defined as state 1, and the arrows are described as steps of the transition. That's it.

First, state IFi represents a completely stopped state of the main engine, and in this state 1, the needle valve 2 and deflector 3 shown in FIG.
is fully closed, and waterwheel 1 is also completely stopped.

When a start command is given in state 1, the state transitions to state 2 via step 1. That is,
Step IFi The opening operation of the needle valve 2 in Fig. 1 is performed, and the resultant state 2 is that even though the needle valve 2 is discharging water, the water turbine 1 is still completely stopped because the deflector 3 is fully closed. It is in a state of being

Next, in step 2, the deflector 3 is opened to a certain opening degree. As a result, the water wheel 1 starts rotating. This is state 3 in FIG.

Next, in step 3, by making use of the input water amount control device 5A linked to the deflector 3, which is one of the waiting points of the present invention, a transition is made to state 4 in which the number of rotations of the water turbine 10 is maintained near the rated number of rotations.

Next, in step 4, the generator 21 is connected to the water turbine 1.
Synchronize with the t-system and transition to state 5 of parallel operation. In state 5, the discharge control device 11A holds the deflector 3 at an appropriate position where it does not interfere with the discharge of the needle valve 2. The input to the water turbine 1 is adjusted by the opening degree of the needle valve 2, and the opening degree of the needle valve 2 is adjusted manually or by a wood-like operation mechanism built into the discharge control device 11A.

Next, in step 5, if a transmission line failure occurs, the generator 21 in FIG. 4 is electrically isolated from the grid 25 by opening the transmission line breaker 24. At that time, the speed of the water turbine 1 in FIG. 2 increases, but in response to this, the input water amount to the water turbine 1 is reduced by the friend deflector 3, which is again linked to the input water amount control device 5A. This will keep it at an appropriate value. In addition, the needle valve 2#: continues the wood-like operation required by the discharge control device 11A,
Maintain the discharge t required for the power plant.

Such a state becomes state 6.

If the failure continues in state 6, the water turbine 1 is brought to an emergency stop in step 8, and the state shifts to state 1. however,
If it is necessary to discharge a certain flow rate as a power plant,
The discharge amount is controlled by fully closing the deflector 3 and adjusting the needle valve 2 appropriately.

On the other hand, if the fault has been removed in state 6, a transition is made to state 7 in step 6.

In state 7, the number of revolutions of the water turbine 10 is controlled by the deflector 3 which is linked to the input water flow control device 5A, and the needle valve 2 maintains the discharge amount required by the discharge control device 11A and the like. In the above case, the transmission line breaker 24 is open and the generator 21 is supplying power only to the in-house circuit 7. Next, in state 7, some kind of failure continues on the grid 25 side. However, when the fault is removed, the generator 21 is brought into synchronization with the grid by turning on the power transmission line breaker 24f. At this time, the speed of the generator 21 is adjusted by the deflector 3. This is the transition from state 7 to state 5 according to step 7.

In addition to the above, it is of course possible to return to state 1 from any state by a stop operation.

In addition, in the above embodiment, the input water amount control device 5A and the discharge control device 11Af may be separately configured by a sequence controller or the like, and the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the Pelton turbine operation control device is configured to adjust the amount of water input to the water turbine using a deflector, and adjust the amount of water discharged from the power plant using a needle valve. Also, the discharge mechanism can be omitted, reducing equipment costs and increasing the operating efficiency of the power plant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a Pelton water turbine operation control device according to an embodiment of the present invention, FIG. 2 is an electrical main circuit diagram including a generator connected to the water turbine, and FIG. 3 is a state transition diagram due to operation control. FIG. 4 is a block diagram of a conventional Pelton turbine operation control device. 1 is a water wheel, 2 is a needle valve, 3 is a deflector, 5A is an input water flow control device, aJd water tank, 9 is a water pipe, and 11A is a discharge control device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant: Mitsubishi Electric Corporation Figure 1 Figure 2 Figure 3 Stay A8

Claims (1)

[Claims] A Pelton water turbine operation control device comprising a deflector and a needle valve and capable of controlling the amount of water input to the water turbine and the amount of water discharged, the input water amount control device causing the deflector to control the amount of water input to the water turbine, and the amount of water discharged. A Pelton water turbine operation control device, characterized in that a discharge control device is provided for causing the needle valves to perform the following control.