JPS63219880A - Hydraulic power generator - Google Patents

Abstract

PURPOSE:To obtain a hydraulic power generator which generates electric power by effectively utilizing the loss pressure by installing a capacity type water wheel for controlling the discharge quantity of a constant speed rotary water feeding pump, power generator connected with the water wheel, and a controller for controlling the excitation current of the power generator. CONSTITUTION:If an industrial device 3 necessitates a flow rate Q100 of 100%, a system controller 10 controls excitation electric current to zero, and an AC exciting inductive power generator 7 is revolved at a number of revolution of N100%, and a capacity type water wheel 5 is revolved at a number of revolution of N100%. In this case, a flow rate of Q100 is supplied into the industrial device 3, and power generation is not performed. When the necessary flow rate of the industrial device 3 reduces to a flow rate of 60%, the number of revolution of the AC exciting inductive power generator 7 is reduced to N60%, and the capacity type water wheel 5 is decelerated to a number of revolution of N60%.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a hydroelectric power generation device, and in particular, a water supply pump that incorporates a displacement water wheel in place of a conventional discharge valve on the discharge side of a water supply pump. The present invention relates to a hydroelectric power generation device that generates power by rotating a positive displacement water turbine by effectively utilizing the energy loss that occurs when adjusting the discharge flow rate.

(Prior art) In general, it is known that a discharge valve is built into a pipe connecting an industrial device such as a condenser and a water pump, and the flow rate required by the industrial device is adjusted by throttling the discharge valve. I'm at work.

FIG. 6 is a diagram showing a characteristic curve H of a water pump and a loss curve H in industrial equipment, in which the horizontal axis shows the flow rate Q and the vertical axis shows the pressure H. Water pumps used in this type of manner are generally operated at a constant rotational speed and are designed so that the characteristic curve H9 and the loss curve H coincide at 100% flow. When it becomes necessary to control the flow rate flowing into the industrial equipment to Ql, the above-mentioned discharge valve is throttled to create a loss and adjust the flow rate to Ql.When adjusted in this way, the pump pressure H11, the industrial Assuming that the pressure loss at the device is Hs□ and the pressure loss at the discharge valve is Hv□, the relationship apl=HS1+Hvl is established.

(Problem to be solved by the invention) However, in the case where the discharge valve is used for adjustment,
The loss pressure Hv1 here is the flow rate flowing to the industrial equipment Ql
There was a problem in that it was released only for the purpose of setting, and it could not be used effectively.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques and to provide a hydroelectric power generation device that can effectively utilize loss pressure Hvl to generate electricity.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a water pump that rotates at a constant speed, a water pump that is connected to the discharge side of the water pump, and a The present invention is characterized by comprising a displacement water turbine that controls the displacement water turbine, a variable speed generator connected to the displacement water turbine, and a control device that controls the excitation current of the generator.

(Function) To explain the present invention in detail based on the above configuration, the flow rate downstream from the water pump is controlled by reducing the rotational speed of the positive displacement water turbine. Then, the energy generated by the aperture at this time drives a generator connected to the water wheel to generate electricity. When flowing 100% of the flow downstream, the control device controls the excitation current to zero current and rotates the displacement water turbine in a no-load state.

No power is generated at this time. When controlling the downstream flow rate, the excitation current is controlled via the control device to reduce the rotational speed of the displacement water turbine. As a result, a load is applied to the displacement water turbine in accordance with the deceleration of the rotational speed, and power generation is performed.

(Example) An example of a hydroelectric power generation device according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates a water pump, and the water pump 1 is configured to supply water to an industrial device 3 through a pipe 2. As shown in FIG. A displacement water turbine 5, such as a roots-type, gear-type, vane-type, etc., is installed on the conduit 2, and a variable-speed AC-excited induction generator is connected to the rotating shaft 5a of the displacement water turbine 5 via a coupling 6. 7 rotating shafts 7a are connected.

This AC-excited induction generator 7 is electrically connected to a power transmission line 9 via a cycloconverter 8 for converting the generated electrical frequency into a constant frequency.

Further, a system control device 10 that controls the excitation current is electrically connected to the AC-excited induction generator 7.

As shown in FIG. 2, the positive displacement water turbine 5 has a characteristic that its flow ff1Q is determined when the rotation speed N is determined. , %, a 100% flow Q1oo flows to the industrial equipment 3, and when it rotates at a rotational speed N6o%, a 60% flow ff1Q6o flows to the industrial equipment 3. Note that the above-mentioned AC-excited induction generator 7 can also be configured with a DC generator.

Next, the operation of the hydroelectric power generation device according to the present invention will be explained with reference to FIGS. 1 and 2.

When the industrial equipment 3 requires a flow rate of 100% Q1oo, the system control device 1o controls the excitation current to zero current, and the AC excitation induction generator 7 has a rotation speed N100%.
The positive displacement water turbine 5 is rotated at a rotation speed of N1oo% (no load state). In this case, the flow is to industrial equipment 3.
Too is sent and no power is generated.

When the required flow rate in the industrial equipment 3 is reduced to, for example, 60% flow rate Q6o, the system control device 1° controls the amount of excitation current, reduces the rotation speed of the AC excitation induction generator 7 to N16%, and increases the volume. The water turbine 5 is decelerated to the rotation speed N60%.

In this case, the flow rate Q on is sent to the industrial device 3, and power generation is performed according to the rotation speed N2O% of the positive displacement water turbine 5.

When the required flow rate in the industrial equipment 3 decreases by 40% or 20%, the rotation speed of the positive displacement water turbine 5 is reduced by N% in the same manner as described above.
Decrease the speed by N%. In this case, the flow H to the industrial equipment 3
Q A flow rate Q2o is sent, and power generation is performed according to the rotational speed N% and N13% of the 40゜ displacement water turbine 5.

According to the present invention, if the pressure loss H1 at 100% rotation speed N1oo% (no load state) is designed to match the loss pressure H1 when the conventional discharge valve is fully open, for example, at 60% rotation speed At several N6o%, the pressure of Hv-H3-Hl out of the loss pressure H3 of the positive displacement water turbine 5 can be effectively used to generate electricity.

This effectively usable pressure H decreases as the rotational speed N decreases. It increases as the time increases.

By the way, the energy P is as follows: ■ η: Since it can be expressed as the efficiency of the volumetric water turbine, the energy P that can be effectively recovered is determined by the relationship between the flow ff1Q and the pressure H.

■ When illustrated, it becomes as shown in FIG.

FIG. 4 shows another embodiment of the hydroelectric power generation device according to the invention.

According to this embodiment, a rotation speed detector 12 for detecting the rotation speed N of the displacement water turbine 5 is connected to the AC-excited induction generator 7, and the rotation speed detector 12 detects the rotation speed N of the displacement water turbine 5. A calculation device 13 into which the relationship with the available pressure Hv is input is connected to the system control device 10.

With this configuration, as shown in FIG. 5, by inputting the required flow rate Q1 in the industrial equipment 3 to the calculation device 13, the number of rotations N1 at which the positive displacement water turbine 5 should be rotated is calculated. Based on the calculation result, the system control device 10 is operated to control the amount of excitation current of the AC excitation induction generator 7,
The rotation speed N1 of the positive displacement water turbine 5 is reliably controlled. This rotation speed N1 can be confirmed by the rotation speed detector 12. Therefore, more fine-grained control is possible, and energy can be recovered without waste. Furthermore, according to the present invention,
It is also possible to configure the input to the arithmetic unit 13 so that the pressure H that can be effectively used is input.

An embodiment of the present invention has been described above with reference to the attached drawings. According to the present invention, the energy loss due to the throttling that occurs when controlling the amount of water sent from the water pump is used to generate electricity by using the q-effect. It is clear that the equipment connected to the downstream side is not limited to industrial equipment, but may also be water supply equipment to each household, etc., which may vary widely. Furthermore, the present invention can be applied to general power generation equipment, and when used in locations with large head fluctuations, it is an extremely effective means as it does not cause an extreme drop in efficiency compared to conventional water turbine power generation equipment. becomes.

〔Effect of the invention〕

1- Since the configuration is as described above, according to the present invention, it is possible to generate electricity by effectively utilizing the energy loss caused by the throttling that occurs when controlling the amount of water sent from the water pump, thereby reducing operating costs. be able to.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of a hydroelectric power generation device according to the present invention, FIGS. 2 and 3 are explanatory diagrams showing the characteristics of a positive displacement water turbine, and FIG. 4 is an explanatory diagram showing an embodiment of a hydroelectric power generation device according to the present invention. FIG. 5 is an explanatory diagram showing the embodiment, FIG. 5 is a block diagram showing its control, and FIG. 6 is an explanatory diagram showing the characteristics of a conventional water pump controlled by a discharge valve. DESCRIPTION OF SYMBOLS 1... Water pump, 3... Industrial equipment, 5... Displacement water turbine, 7... AC excitation induction generator, 8... Cyclo converter, 10... System control device, 12...
- Rotation speed detector, 13... calculation device. Applicant's agent Mr. Sato $1 □Q 2nd hearing Figure 3 Figure 4

Claims (1)

[Claims] 1. A water pump that rotates at a constant speed, a displacement water wheel connected to the discharge side of the water pump to control the discharge amount of the water pump, and a variable speed water turbine connected to the displacement water pump. A hydroelectric power generation device comprising a generator and a control device that controls the excitation current of the generator. 2. The hydroelectric power generation system according to claim 1, wherein the variable speed generator is an AC-excited induction generator, and a cycloconverter is connected to the power transmission line side of the AC-excited induction generator. 3. A calculation device that calculates the rotation speed of the displacement water turbine from the flow rate to flow through the displacement water turbine can be connected to the control device, and the excitation current of the variable speed generator can be controlled based on the calculation result. A hydroelectric power generation device according to claim 1, wherein the hydroelectric power generation device is configured as follows.