JP2022054110A - Pump/hydraulic power generating device and hydraulic power generating system - Google Patents

Abstract

To provide a pump/hydraulic power generating device including an inverter circuit and a rectifier circuit in a periphery, and a hydraulic power generating system.SOLUTION: A pump/hydraulic power generating device is provided with an inverter part, a motor/generator, and a pump/reversing turbine in one body. The inverter part includes an inverter circuit formed by bridge-connecting a plurality of arms having diodes connected to a switching element in reverse parallel. The motor/generator is electrically connected to the inverter circuit. The pump/turbine is mechanically connected to the motor/generator. Here, the inverter circuit converts, when the motor/generator is driven by the pump/reversing turbine to generate electricity, AC power generated by the motor/generator into DC power through the diode.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hydroelectric power generation device that also serves as a pump and a hydroelectric power generation system.

Conventionally, a pump device for rotating an impeller of a pump by driving a motor is known. Further, a hydroelectric power generation device is known in which a pump is used as a water turbine and an impeller of the water turbine is rotated in the reverse direction to drive a generator.

Pumping devices and hydroelectric power generators are similar in that they use impellers and rotary electric machines (motors, generators) that have rotors and stators that work with the impellers, but their use is pumps (pumping). , Water supply, drainage, etc.) or power generation. Further, in the pump device, the input side of the motor is connected to the inverter circuit. On the other hand, in the hydroelectric power generation device, the output side of the generator is connected to the rectifier circuit. That is, the pump device and the hydroelectric power generation device have different uses and peripheral circuits, respectively.

Due to the difference between such a pump device and a hydroelectric power generation device, it is difficult to realize a pump device and a hydroelectric power generation device or a system that includes a peripheral inverter circuit and a rectifying circuit and also serves as a pump device and a hydroelectric power generation device. It has become.

Japanese Unexamined Patent Publication No. 2009-235973

An object of the present invention is to realize a hydroelectric power generation device and a hydroelectric power generation system that also serve as a pump and include a peripheral inverter circuit and a rectifier circuit.

The pump-combined hydroelectric power generation device according to one aspect of the present invention is integrally provided with an inverter unit, a motor-combined generator, and a pump-combined reversing turbine.
The inverter unit includes an inverter circuit in which a plurality of arms in which diodes are connected in antiparallel to a switching element are bridge-connected.
The motor-combined generator is electrically connected to the inverter circuit.
The pump-combined water turbine is mechanically connected to the motor-combined generator.
Here, the inverter circuit converts the AC power generated by the motor / generator into a DC power source by the diode at the time of power generation in which the motor / generator is driven by the pump / reverse water wheel.

The hydroelectric power generation system according to another aspect of the present invention includes the pump-combined hydroelectric power generation device and a grid-connected inverter.
The inverter unit further includes a rectifier circuit, a capacitor, a positive output terminal, and a negative output terminal.
The rectifier circuit can be electrically connected to a commercial power source.
The capacitor is connected between the positive output line and the negative output line in the rectifier circuit, and is connected in parallel to the inverter circuit.
The positive output terminal is connected to the positive output line.
The negative output terminal is connected to the negative output line.
The capacitor smoothes the DC power supply.
The positive output terminal and the negative output terminal output the smoothed DC power supply.
The grid interconnection inverter converts the DC power output output from the positive side output terminal and the negative side output terminal into an AC power source, and supplies the converted AC power source to the commercial power source or an individual load.

According to the present invention, it is possible to realize a hydroelectric power generation device for both pumps and a hydroelectric power generation system including a peripheral inverter circuit and a rectifier circuit.

The circuit diagram which illustrates the pump-combined hydroelectric power generation apparatus which concerns on 1st Embodiment. The front view which illustrates the appearance of the hydroelectric power generation apparatus also used as a pump of FIG. FIG. 5 is a side view illustrating the appearance of the hydroelectric power generation device also used as a pump in FIG. 1. FIG. 3 is a plan view illustrating the appearance of the hydroelectric power generation device also used as a pump in FIG. 1. FIG. 6 is a schematic diagram illustrating the operation of the hydroelectric power generation device also used as a pump in FIG. 1 as a pump. FIG. 6 is a schematic diagram illustrating the operation of the hydroelectric power generator also used as a pump in FIG. 1 as a generator. FIG. 6 is a schematic diagram illustrating another operation of the hydroelectric power generator also used as a pump in FIG. 1 as a generator. The circuit diagram which illustrates the hydroelectric power generation system which concerns on 2nd Embodiment. The schematic diagram which illustrates the hydroelectric power generation system of FIG. 8 and its piping system. FIG. 9 is a schematic diagram illustrating the operation of the hydroelectric power generation system of FIG. 9 as a pump. FIG. 9 is a schematic diagram illustrating the operation of the hydroelectric power generation system of FIG. 9 as a generator. FIG. 9 is a schematic diagram illustrating another operation of the hydroelectric power generation system of FIG. 9 as a pump. The circuit diagram which illustrates the hydroelectric power generation system which concerns on the modification of 2nd Embodiment.

Hereinafter, embodiments will be described with reference to the drawings. Hereinafter, the same or similar reference numerals are given to the elements that are the same as or similar to the described elements, and the duplicated description is basically omitted. For example, when there are multiple identical or similar elements, a common code may be used to explain each element without distinction, and the common code may be used to describe each element separately. In addition, branch numbers and / or lowercase letters may be used.

<First Embodiment>
FIG. 1 is a circuit diagram illustrating the pump-combined hydroelectric power generation device according to the first embodiment. 2 to 4 are a front view, a side view, and a plan view illustrating the appearance of the hydroelectric power generation device also used as a pump, respectively. The pump-combined hydroelectric power generation device 1 is integrally provided with an inverter unit 10, a motor-combined generator 20, and a pump-combined reversing turbine 30. That is, the pump-combined hydroelectric power generation device 1 includes an inverter unit 10, a motor-combined generator 20, and a pump-combined reversing turbine 30 that are integrally provided with each other. Here, "integrally" means a configuration in which the inverter unit 10, the generator combined with a motor 20, and the reversing turbine 30 combined with a pump are provided "as one product". For example, in FIG. 3, the rotation shaft of the rotor of the motor-combined generator 20 and the rotation shaft of the impeller of the pump-combined reversing turbine 30 are located on the same straight line 40, but are not limited thereto. For example, even when the rotating shafts are arranged substantially parallel to each other and connected via a power transmission device such as a belt or a speed increaser (gear), the inverter unit 10, the motor combined generator 20, and the pump combined reversing turbine are connected. 30 is integrally provided including a power transmission device. Further, even when the rotating shafts are located on the same straight line 40, the rotating shafts may be directly connected to each other without a shaft joint or may be connected to each other via a shaft joint. Further, in FIG. 3, the inverter unit 10 is attached to the motor combined generator 20, but the present invention is not limited to this, and the inverter portion 10 may be attached to the pump combined reversing turbine 30. Alternatively, the inverter unit 10 may be arranged on a plate-shaped member on which the reversing turbine 30 also used as a pump is installed, or on a support base provided on the plate-shaped member. Even in this case, the inverter unit 10, the motor combined generator 20, and the pump combined reversing turbine 30 are integrally provided including the plate-shaped member. Further, the pump-combined hydroelectric power generation device 1 is not limited to one unit, and a plurality of units may be operated in parallel.

Here, the inverter unit 10 includes an inverter circuit 13 in which a plurality of arms 13a to 13f in which a diode D is connected in antiparallel to a switching element Tr are bridge-connected. Specifically, in the inverter circuit 13, the arms 13a to 13c having one end connected to the positive output line 14 and the arms 13d to 13f connected between the arms 13a to 13c and the negative output line 15 are bridged. Be connected. Each of the arms 13a to 13f has a diode D connected in antiparallel to the switching element Tr. This diode D is also referred to as a "freewheel diode" or a "reflux diode". As the switching element Tr, a semiconductor switching element such as a GTO (gate turn-off thyristor) or an IGBT (insulated gate type bipolar transistor) can be appropriately used. Further, the pair of the positive arm and the negative arm is arranged by the number of alternating current phases. In the example of three-phase alternating current (eg, three-phase 200V) shown in FIG. 1, the pair of the positive side arm and the negative side arm is a set of arms 13a and 13d, a set of arms 13b and 13e, and an arm 13c. , 13f set and three are arranged. Such an inverter circuit 13 supplies a pulse-shaped (rectangular wave-shaped) voltage to the motor-combined generator 20 by PWM (pulse width modulation) control by a gate drive signal from an inverter control board (not shown). Supplementally, the inverter circuit 13 supplies a pulsed voltage for performing, for example, a target pressure constant control operation to the motor / generator 20 by variable speed control by a gate drive signal. The inverter control board may be included in the inverter section or may be included in an external control panel (not shown). The inverter unit 10 may further include a rectifier circuit 11, a capacitor 12, a positive output terminal P, and a negative output terminal N. Further, the inverter circuit 13 converts the AC power generated by the motor / generator 20 into a DC power source by the diode D at the time of power generation in which the motor / generator 20 is driven by the pump / reverse water wheel 30.

The rectifier circuit 11 is a circuit that can be electrically connected to the commercial power source 50 via the inverter input terminals (R, S, T), and includes, for example, diodes 11a to 11f connected by a three-phase bridge. The rectifier circuit 11 converts the three-phase AC voltage supplied from the commercial power source 50 into a DC voltage, and converts this DC voltage between the positive output line 14 and the negative output line 15 via the capacitor 12 and the inverter circuit 13. Supply to.

The capacitor 12 is connected between the positive output line 14 and the negative output line 15 in the rectifier circuit 11, and is connected in parallel to the inverter circuit 13. The capacitor 12 stores and smoothes the DC voltage between the positive output line 14 and the negative output line 15.

The positive output terminal P is connected to the positive output line 14.

The negative output terminal N is connected to the negative output line 15.

The motor-combined generator 20 is a rotary electric machine that can be used with either a motor or a generator, and is electrically connected to the inverter circuit 13. Further, the motor / generator 20 is mechanically connected to the pump / reverse turbine. Specifically, for example, the motor-combined generator 20 includes a stator electrically connected to the inverter circuit 13 and a rotor mechanically connected to the pump-combined reversing turbine 30. The term "mechanically connected" refers to a configuration in which the rotation shaft of the rotor of the motor / generator 20 and the rotation shaft of the impeller of the pump / reverse water wheel 30 are directly connected, and each rotation shaft forms a power transmission device. Includes configurations connected via. That is, the rotation axis of the rotor of the motor / generator 20 and the rotation axis of the impeller of the pump / reverse turbine 30 may be located on the same straight line 40, and may not be located on the same straight line 40. You may. Such a motor-combined generator 20 may be, for example, a permanent magnet type synchronous motor-combined generator in which the rotor is provided with a permanent magnet.

Further, when the motor / generator 20 is used as a motor for driving the pump / reverse water wheel 30, the rotor is rotated by the pulsed voltage supplied from the inverter portion 10 to rotate the rotor via each rotating shaft. The impeller of the reversing water wheel 30 also used as a pump is rotated.

Further, when the motor / reverse generator 20 is used as a generator driven by the pump / reverse water wheel 30, the rotor rotates via each rotation shaft due to the rotation of the impeller of the pump / reverse water wheel 30. As a result, the AC voltage generated in the stator coil is supplied to the inverter circuit 13.

The reversing water wheel 30 also used as a pump is a fluid machine that can be used with either a pump or a reversing water wheel. It can be used as appropriate. For example, the reversing water wheel 30 also used as a pump has a casing that guides fluid from a suction port to an impeller and guides the fluid discharged from a rotating impeller to a discharge port to discharge the fluid, and an impeller rotatably housed in the casing. And a rotating shaft (main shaft) fixed to the impeller and transmitting power to the impeller. On the contrary, when the reversing turbine 30 also used as a pump is used as a reversing turbine, the suction port and the discharge port are connected in the opposite direction to those when the pump is used, the fluid is guided from the discharge port to the impeller, and the fluid discharged from the impeller that rotates in the reverse direction. Is guided to suction and discharged. In this case, the pump-combined reversing turbine 30 becomes a reversing turbine, and the motor-combined generator 20 becomes a generator to generate AC power.

Further, the reversing turbine 30 also used as a pump is installed and used at a place suitable for the intended use. That is, when the pump-combined reversing turbine 30 is used as a pump driven by a motor-combined generator 20, for example, it is installed in a water supply pipe of a building. Any water supply system such as a direct water supply system or a water tank system can be applied to the reversing turbine 30 that also serves as a pump. For example, the reversing turbine 30 that also serves as a pump is a so-called direct pressure boosting type that is directly connected to the water main and directly boosts the water flowing through the water main to supply water to a supply destination such as a faucet or a shower head provided in a building. It can be used as a pump. Alternatively, the reversing turbine 30 that also serves as a pump is a so-called pressurized pump type that sucks water stored in a water tank from a water main to increase the pressure and supplies water to a supply destination such as a faucet or a shower head provided in a building. It can be used as a pump. In any case, the pump-combined reversing turbine 30 as a pump sucks the water on the primary side through the suction port 31 connected to the suction pipe by the rotation of the impeller driven by the motor-combined generator 20. The pressure is increased, and water is supplied from the discharge port 32 to the supply destination on the secondary side via the discharge pipe.

Further, when the pump-combined reversing turbine 30 is used as a reversing turbine for driving a motor-combined generator 20, it is installed in a place where there is a water flow, for example, a river or an irrigation canal. The reversing turbine 30 which also serves as a pump drives the generator 20 which also serves as a motor by rotating the impeller in the reverse direction by the water flow taken in from the discharge port 32 of the pump, and discharges the water flow from the suction port 31 of the pump.

Next, an operation example of the hydroelectric power generation device that also serves as a pump configured as described above will be described with reference to FIGS. 5 to 7. This operation example includes an operation when used as a pump (FIG. 5) and an operation when used as a generator (FIGS. 6 and 7). Hereinafter, each operation example will be described in order.

(Operation when used as a pump: Fig. 5)
First, it is assumed that the pump-combined hydroelectric power generation device 1 is installed in, for example, a pump room in the basement of a building. Further, it is assumed that the reversing turbine 30 also used as a pump is connected to the water supply pipe of the building. Here, the suction pipe on the primary side of the water supply pipe may be, for example, a water main in a directly connected water supply system or a suction pipe in a water receiving tank in a water tank system.

Here, as shown by the arrow 51, the inverter unit 10 supplies the obtained pulsed voltage to the motor / generator 20 by converting the three-phase AC voltage supplied from the commercial power source 50. Specifically, the rectifier circuit 11 of the inverter unit 10 converts the three-phase AC voltage supplied from the commercial power source 50 into a DC voltage, and converts this DC voltage into a capacitor between the positive output line 14 and the negative output line 15. It is supplied to the inverter circuit 13 via 12. The capacitor 12 smoothes the DC voltage between the positive output line 14 and the negative output line 15.

The inverter circuit 13 switches and controls each of the switching elements Tr of the arms 13a to 13f to an on state or an off state by PWM control using a gate drive signal from an inverter control board (not shown), and uses a pulsed voltage as a motor / generator. Supply to 20. When the switching element Tr is switched on and off, the diodes D of the arms 13a to 13f consume the counter electromotive force generated by the inductive load of the motor or the like by passing a forward current. That is, the diode D protects the switching element Tr from the overvoltage due to the counter electromotive force at the time of on / off switching.

As described above, the inverter unit 10 converts the three-phase AC voltage supplied from the commercial power source 50 via the rectifier circuit 11, the capacitor 12, and the inverter circuit 13, and converts the obtained pulsed voltage into a generator that also serves as a motor. It is supplying to 20.

On the other hand, the motor-combined generator 20 is driven by the pulsed voltage, and the rotor rotates to rotate the rotating shaft of the pump-combined reversing turbine 30.

The reversing turbine 30 also used as a pump sucks water on the primary side through the suction port 31 to increase the pressure by rotating the impeller fixed to the rotating shaft, and increases the pressure from the discharge port 32 via the discharge pipe. Water is supplied to the supply destination on the side.

In this way, the pump-combined hydroelectric power generation device 1 is used as a pump.

(Operation when used as a generator: Fig. 6 and Fig. 7)
First, it is assumed that the pump-combined hydroelectric power generation device 1 is installed in, for example, a hut provided above an irrigation canal having a water flow. Further, in the reversing turbine 30 also used as a pump, the pipes are connected so that the suction port and the discharge port are opposite to those when the pump is used. For example, in the pump-combined reversing turbine 30, the suction pipe connected to the discharge port 32 of the pump is arranged in the irrigation canal, and the discharge pipe connected to the suction port 31 of the pump is arranged in the irrigation canal on the downstream side of the suction pipe. It is assumed that it has been done. That is, the pump-combined hydroelectric power generation device 1 is arranged so that the water flow in the irrigation canal flows through the pump-combined reversing water wheel 30 in a state where the electric systems such as the inverter unit 10 and the motor-combined generator 20 are located outside the irrigation canal. It is assumed that it has been done. In this case, it is preferable that all the water flows in the irrigation canal flow in the reversing turbine 30 also used as a pump. Further, for example, it is assumed that the grid interconnection inverter 60 is electrically connected between the positive side output terminal P and the negative side output terminal N of the inverter unit 10. As the grid interconnection inverter 60, a power supply regeneration converter, a power conditioner, or the like can be appropriately used. As shown in FIGS. 6 and 7, the grid interconnection inverter 60 converts the DC power output from the positive output terminal P and the negative output terminal N into an AC power source, and converts the converted AC power source into a commercial power source 50. Alternatively, it is supplied to the individual load 55. However, in the following description, a case of supplying (regenerating) to the commercial power source 50 as shown in FIG. 6 will be described as an example. Further, the following description may be an operation example of a hydroelectric power generation system including a pump-combined hydroelectric power generation device 1 and a grid interconnection inverter 60. Here, the grid interconnection inverter 60 has the same circuit configuration as the inverter circuit 13. For example, in the grid interconnection inverter 60, a plurality of arms 61 to 66 in which a diode d is connected in antiparallel to a switching element tr are bridge-connected. Specifically, the grid interconnection inverter 60 includes arms 61 to 63 having one end connected to the positive output terminal P and arms 64 to 66 connected between the arms 61 to 63 and the negative output terminal N. Is bridged. Such a grid interconnection inverter 60 can switch the on / off state of each switching element tr by the same PWM control as the inverter circuit 13.

Here, the pump-combined reversing turbine 30 drives the motor-combined generator 20 by rotating the impeller in the reverse direction by the water flow taken in from the discharge port 32 in the pump, and discharges the water flow from the suction port 31 in the pump.

The motor / generator 20 supplies the AC voltage generated in the stator to the inverter circuit 13 by driving the rotation shaft by the rotation of the impeller of the pump / reverse water wheel 30 to rotate the rotor. That is, the motor / generator 20 is driven by the pump / reverse turbine 30 to generate AC power and supply it to the inverter circuit 13.

Here, as shown by the arrow 21, the inverter circuit 13, the capacitor 12, and the grid interconnection inverter 60 convert the AC power generated by the motor-combined generator 20 into a DC power source for smoothing, and the smoothed DC. The power source is converted into an AC power source and regenerated into the commercial power source 50.

Specifically, the inverter circuit 13 converts the AC power generated by the motor-combined generator 20 into a DC power supply by the diode D. Supplementally, since the inverter circuit 13 does not drive the motor / combined generator 20 during power generation using the motor / combined generator 20 as a generator, no gate drive signal is input and all switching elements Tr are turned off. Therefore, the inverter circuit 13 is an equivalent circuit of a rectifier circuit in which the diode D is bridge-connected. That is, the inverter circuit 13 operates as a rectifier circuit in which the diode D is bridge-connected during power generation by the motor-combined generator 20. Therefore, the inverter circuit 13 converts the generated AC power source into a DC power source by the diode bridge. That is, when the hydroelectric power generation device 1 also used as a pump is used as a reversing turbine to generate electricity, a DC power source can be automatically generated.

The capacitor 12 smoothes the DC power source converted by the diode D.

The positive side output terminal P and the negative side output terminal N output the smoothed DC power supply to the grid interconnection inverter 60.

The grid interconnection inverter 60 converts the output DC power supply into an AC power supply, and regenerates the converted AC power supply into the commercial power supply 50.

As described above, the inverter circuit 13, the capacitor 12, and the grid interconnection inverter 60 convert the generated AC power source into a DC power source and smooth it, and convert the smoothed DC power source into an AC power source to convert the generated AC power source into a commercial power source 50. Is regenerating.

As described above, according to the first embodiment, the pump-combined hydroelectric power generator includes an inverter unit including an inverter circuit in which a plurality of arms in which diodes are connected in antiparallel to a switching element are bridge-connected, and an inverter circuit. An electrically connected motor-combined generator and a pump-combined reversing water wheel mechanically connected to the motor-combined generator are integrally provided. Here, the inverter circuit converts the AC power generated by the motor / generator into a DC power source by the diode at the time of power generation in which the motor / generator is driven by the pump / reverse water wheel.

As described above, the inverter circuit operates as an inverter when used as a pump, and operates as a rectifier circuit in which a diode is bridge-connected when used as a generator. That is, a configuration in which the inverter circuit when the pump is used also serves as the rectifier circuit when the generator is used makes it possible to realize a hydroelectric power generation device that also serves as a pump and includes a peripheral inverter circuit and a rectifier circuit. Further, according to the first embodiment, one product called a hydroelectric power generation device also used as a pump can be easily used not only for a pump application but also for a power generation application as a pump reversing turbine. That is, the product manufactured as a motor pump can be used as a reversing turbine generator. In other words, the inverter-driven motor direct-coupled pump and the inverter-mounted pump reversing turbine can be used in combination. In addition, by integrating the inverter unit, the generator that also serves as a motor, and the reversing turbine that also serves as a pump, it is possible to reduce the size and improve mass productivity. Supplementally, in the inverter circuit, both a switching element and a diode are used when used as a pump. On the other hand, in the inverter circuit, when used as a generator, only a diode is used among the switching element and the diode. Therefore, when one product called a hydroelectric power generation device that also serves as a pump is used only for power generation, it is mounted even though the switching element of the inverter circuit is not used. On the other hand, the pump-combined hydroelectric power generation device has an advantage that it can be easily managed as compared with the case where the pump device and the hydroelectric power generation device are managed separately. Further, for example, the price of the hydroelectric power generation device that also serves as a pump can be reduced as compared with the case where the pump device and the hydroelectric power generation device are designed separately, and even if a switching element that is not used for power generation is mounted. It is possible to prevent the price from becoming expensive.

Further, according to the first embodiment, the motor combined generator may be a permanent magnet type synchronous motor combined generator. In this case, in addition to the above-mentioned effects, it is possible to improve the motor efficiency and the power generation efficiency of the hydroelectric power generation device that also serves as a pump.

Further, according to the first embodiment, the rotation shaft of the rotor of the motor-combined generator and the rotation shaft of the impeller of the pump-combined reversing turbine may be positioned on the same straight line with each other. In this case, in addition to the above-mentioned action and effect, since the belt or the like is not interposed between the rotating shafts, the power transmission loss between the rotating shafts can be suppressed and the device can be made compact.

Further, according to the first embodiment, the inverter unit is connected between a rectifier circuit that can be electrically connected to a commercial power source and a positive output line and a negative output line in the rectifier circuit, and is an inverter circuit. A capacitor connected in parallel with the capacitor, a positive output terminal connected to the positive output line, and a negative output terminal connected to the negative output line may be further included. Here, the capacitor smoothes the DC power supply, and the positive side output terminal and the negative side output terminal output the smoothed DC power supply. In this case, in addition to the above-mentioned effects, the inverter section further includes a rectifier circuit, a capacitor, and the like when the pump is used. can. Further, since the inverter unit further includes the positive side output terminal and the negative side output terminal, the DC power source obtained by power generation can be output to the outside of the inverter unit.

Further, according to the first embodiment, the above-mentioned pump-combined hydroelectric power generation device and the DC power source output from the positive side output terminal and the negative side output terminal are converted into an AC power source, and the converted AC power source is used. A hydroelectric power generation system may be provided with a commercial power source or a grid interconnection inverter that supplies individual loads. In this case, in addition to the above-mentioned effects, it is possible to realize a hydroelectric power generation system equipped with a hydroelectric power generation device that also serves as a pump including a peripheral inverter circuit and a rectifying circuit, and supplies the AC power generation obtained by the power generation to a commercial power source or an individual load. can do. Supplementally, the DC power supply taken out from the positive side output terminal and the negative side output terminal can be connected to the power system via the grid interconnection inverter to sell power, or connected to an individual load to supply power to other equipment. Therefore, the generated electricity can be effectively used.

[First modification of the first embodiment]
The first embodiment may be modified as in the following first modification.
The hydroelectric power generation system according to the first modification is a mode in which a pump-combined hydroelectric power generation device is alternately switched and used as a pump and a generator without switching the piping system.

Specifically, the hydroelectric power generation system according to the first modification includes the above-mentioned hydroelectric power generation device that also serves as a pump, and suction pipes and discharge pipes that are connected to a suction port and a discharge port when the reversing turbine that also serves as a pump is used as a pump. It is equipped with a discharge pipe. When a pushing pressure is applied to the impeller of the reversing turbine that also serves as a pump from the suction pipe, the impeller rotates in the normal direction and the generator that also serves as a motor generates AC power. When the pushing pressure is applied, for example, the suction pipe may be a water main in a direct water supply system. That is, when the above-mentioned hydroelectric power generator that also serves as a pump is installed as a direct-coupled water pump, the reversing turbine that also serves as a pump can be used as a pump when it is driven by the generator that also serves as a motor, and the reversing turbine that also serves as a pump can be used as a turbine when it is not driven. can do. Supplementally, even when the inverter is stopped, if there is a pushing pressure at the suction port of the reversing turbine that also serves as a pump, the pump can operate in the normal direction to generate electricity. However, in the state where power is generated by the pushing pressure, it is only stored in the capacitor as a DC power source. On the other hand, if the positive side output terminal P and the negative side output terminal N are provided in advance in the DC power supply unit which is the intermediate voltage of the inverter unit, the DC power supply can be taken out of the inverter unit. The above effects can be similarly obtained even when the hydroelectric power generation system according to the first modification is provided with the above-mentioned grid interconnection inverter. In this case, in the same manner as described above, the DC power supply taken out from the positive side output terminal and the negative side output terminal is connected to the power system via the grid interconnection inverter to sell the power, or is connected to the individual load. It can be used as a power source for other devices, and the generated electricity can be effectively used.

[Second variant of the first embodiment]
The first modification of the first embodiment may be modified as in the second modification below.
The hydroelectric power generation system according to the second modification is a form further provided with a storage battery in the form of switching use in the first modification.

Specifically, as shown in FIG. 8, in the hydroelectric power generation system according to the second modification, in addition to the pump-combined hydroelectric power generation device 1 according to the first modification, the positive side output terminal P and the negative side of the inverter unit 10 Further, a storage battery 70 for storing the DC power output output from the output terminal N is provided.

Here, the storage battery 70 stores a DC power source that exceeds the storage capacity of the capacitor 12 at the time of power generation, and when the reversing water wheel 30 also used as a pump is used as a pump, the stored DC power source is used as the positive side output terminal P and the negative side. It is supplied to the inverter circuit 13 via the output terminal N.

That is, when a reversing turbine that also serves as a pump is connected as a direct-coupled water turbine, the turbine is turned into a turbine by the pushing pressure from the suction port while the inverter is stopped, and a DC power supply that exceeds the storage capacity of the condenser 12 during power generation by the forward rotation of the turbine is stored in the storage battery. 70 stores electricity. When the pump is used, the storage battery 70 supplies the stored DC power supply to the inverter circuit 13 via the positive side output terminal P and the negative side output terminal N, and the inverter circuit 13 drives the motor-combined generator to pump. Rotate the impeller of the dual-purpose reverse water wheel. As described above, the generated electricity can be effectively utilized by the configuration in which the surplus DC power source is stored in the storage battery at the time of power generation and the DC power source is used when the pump is used. The effect of using the storage battery 70 can be similarly obtained even when the hydroelectric power generation system according to the second modification is provided with the system interconnection inverter described above.

<Second embodiment>
FIG. 9 is a circuit diagram illustrating the hydroelectric power generation system according to the second embodiment and a schematic diagram illustrating the piping system of the system, and substantially the same parts as those in FIGS. 1 and 5 are designated by the same reference numerals. The detailed explanation is omitted, and here, the different parts are mainly described. Similarly, in each of the following embodiments, the description of the duplicated portion will be omitted.

The hydroelectric power generation system according to the second embodiment is different from the second modification of the first embodiment, and by switching the piping system, the pump / hydroelectric power generation device is alternately switched as each of the pump and the generator. It is a form to be used. The configuration other than the piping system is the same as that of the second modification as shown in FIG.

Along with this, the piping system connected to the pump-combined reversing turbine 30 can switch the piping between the time of power generation and the time of using the pump (during pumping). For example, as shown in FIG. 9, a primary side pipe 81 capable of sucking / discharging water to the first water storage tank 80 is connected to the suction port 31 when the pump of the reversing turbine 30 also used as a pump is used. Further, a secondary side pipe 82 is connected to the discharge port 32 when the pump of the reversing turbine 30 also used as a pump is used. The secondary side pipe 82 can discharge water to the second water storage tank 83 via the three-way valve 82a and the discharge pipe 82b. Further, the bottom of the second water storage tank 83 and the three-way valve 82a are connected via an outflow pipe 82c. The three-way valve 82a is a valve capable of switching the piping system so that the secondary side pipe 82 and the discharge pipe 82b are communicated with each other when the pump is used, and the outflow pipe 82c and the secondary side pipe 82 are communicated with each other when the pump is used. Since the first water tank 80 is arranged above the second water tank 83, it may be called an upper water tank. Similarly, the second water tank 83 may be referred to as a lower water tank. Further, the first water tank 80 and the second water tank 83 are not limited to water tanks, but may be ponds. Further, the names of the pipes such as the primary side pipe 81, the secondary side pipe 82, the discharge pipe 82b, and the outflow pipe 82c are for convenience and may be changed as appropriate.

Other configurations are the same as in the first embodiment.

Next, an operation example of the hydroelectric power generation system configured as described above will be described with reference to FIGS. 8, 10 to 12. This operation example includes an operation when the storage battery 70 is used as a pump (FIGS. 10 and 12) and an operation when the storage battery 70 is used as a generator capable of storing electricity (FIG. 11) before and after the storage of the storage battery 70. There is. Hereinafter, each operation example will be described in order.

(Operation when used as a pump_Before storage of the storage battery 70: Fig. 10)
First, it is assumed that the three-way valve 82a communicates the secondary side pipe 82 and the discharge pipe 82b. Further, it is assumed that the storage battery 70 has not yet been stored.

Here, as shown by the arrow 51 in FIG. 10, the inverter unit 10 supplies the obtained pulsed voltage to the motor / generator 20 by converting the three-phase AC voltage supplied from the commercial power source 50. do.

The motor-combined generator 20 is driven by the pulsed voltage, and the rotor rotates to rotate the rotating shaft of the pump-combined reversing turbine 30.

As the impeller fixed to the rotating shaft rotates, the pump-combined reversing turbine 30 sucks water from the suction port 31 to increase the pressure and discharges the water from the discharge port 32, as shown by the arrow 84. Specifically, the pump-combined reversing water wheel 30 sucks water in the first water storage tank 80 through the suction port 31 and the primary side pipe 81 to increase the pressure, and discharges the secondary side pipe 82, the three-way valve 82a and the discharge from the discharge port 32. Water is supplied to the second water storage tank 83 via the pipe 82b.

As described above, in the hydroelectric power generation system, the hydroelectric power generation device 1 also used as a pump is used as a pump by the three-phase AC voltage supplied from the commercial power source 50 before the storage battery 70 is charged.

(Operation when used as a generator_storage battery 70 is stored: Fig. 11)
First, it is assumed that the three-way valve 82a communicates the outflow pipe 82c connected to the bottom of the second water storage tank 83 with the secondary side pipe 82.

As a result, the water in the second water storage tank 83 is taken into the pump-combined reversing turbine 30 from the discharge port 32 through the outflow pipe 82c, the three-way valve 82a, and the secondary side pipe 82. As shown by the arrow 85, the pump-combined reversing turbine 30 drives the motor-combined generator 20 by rotating the impeller in the reverse direction by the water flow taken in from the discharge port 32, and connects the primary side pipe 81 from the suction port 31 in the pump. A water stream is discharged to the first water tank 80 through the water.

In the motor / generator 20, the rotating shaft is driven by the rotation of the impeller of the pump / reverse water wheel 30 to rotate the rotor, and as shown in FIG. 8, the AC voltage generated in the stator is converted into an inverter. It is supplied to the circuit 13. That is, the motor / generator 20 is driven by the pump / reverse turbine 30 to generate AC power and supply it to the inverter circuit 13.

Here, as shown by the arrow 22, the inverter circuit 13 and the capacitor 12 convert the AC power generated by the motor / combined generator 20 into a DC power source for smoothing and storage, and the storage battery 70 is the capacitor 12. Stores DC power that exceeds the storage capacity.

As described above, the hydroelectric power generation system uses the pump-combined hydroelectric power generation device 1 as a generator at the time of power generation, and stores the DC power source exceeding the storage capacity of the capacitor 12 in the pump-combined hydroelectric power generation device 1 in the storage battery 70. There is.

(Operation when used as a pump_Discharge after storage: Fig. 12)
First, it is assumed that the three-way valve 82a communicates the secondary side pipe 82 and the discharge pipe 82b. It is assumed that the storage battery 70 has been charged.

Here, as shown by the arrow 71 in FIG. 12, the storage battery 70 supplies the stored DC power supply to the inverter circuit 13 via the positive side output terminal P and the negative side output terminal N shown in FIG.

The motor-combined generator 20 is driven by the pulsed voltage, and the rotor rotates to rotate the rotating shaft of the pump-combined reversing turbine 30.

As the impeller fixed to the rotating shaft rotates, the pump-combined reversing turbine 30 sucks water from the suction port 31 to increase the pressure and discharges the water from the discharge port 32, as shown by the arrow 84 in FIG. That is, similarly to the above, the pump-combined reversing water wheel 30 sucks water in the first water storage tank 80 through the suction port 31 and the primary side pipe 81 to increase the pressure, and the secondary side pipe 82 and the three-way valve are increased from the discharge port 32. Water is supplied to the second water storage tank 83 via the 82a and the discharge pipe 82b.

As described above, in the hydroelectric power generation system, after the storage battery 70 is charged, the pump-combined hydroelectric power generation device 1 can be used as a pump by the DC power supply supplied from the storage battery 70.

As described above, according to the second embodiment, the hydroelectric power generation system stores the pump-combined hydroelectric power generation device according to the first embodiment and the DC power supply output from the positive side output terminal and the negative side output terminal. It is equipped with a storage battery. Here, the storage battery stores DC power that exceeds the storage capacity of the capacitor during power generation, and when the reverse water wheel that also serves as a pump is used as a pump, the stored DC power is transmitted via the positive side output terminal and the negative side output terminal. Supply to the inverter circuit.

Therefore, in addition to the operation and effect of the first embodiment, the configuration provided with the storage battery can reduce the degree of use of the commercial power source and save power when the pump is used.

[Modified example of the second embodiment]
The second embodiment may be modified as in the following modification.
The hydroelectric power generation system according to the modified example is a combination of the first and second embodiments, and as shown in FIG. 13, in parallel with the storage battery 70 of the pump-combined hydroelectric power generator 1 according to the second embodiment. , Is a mode in which the grid interconnection inverter 60 according to the first embodiment is connected. The pump-combined reversing turbine 30 is connected to the switchable piping system according to the second embodiment.

Here, in the grid interconnection inverter 60, similarly to the above, the DC power source output from the positive side output terminal P and the negative side output terminal N of the pump / combined hydroelectric power generation device 1 is converted into an AC power source, and the converted AC power source is used. Is supplied to the commercial power source 50 or the individual load 55. However, the storage battery 70 is connected between both the positive output terminal P and the negative output terminal N to which the grid interconnection inverter 60 is connected. Further, a distribution board 58 is connected between the grid interconnection inverter 60, the commercial power supply 50, and the individual load 55. The distribution board 58 connects or disconnects between the grid interconnection inverter 60 and the commercial power supply 50. Further, the distribution board 58 connects or disconnects between the grid interconnection inverter 60 and the individual load 55.

According to the above configuration, after the pump operation of FIG. 10 and the storage operation of FIG. 11 described above, the grid interconnection inverter 60 converts the DC power supply supplied from the storage battery 70 into an AC power supply, and the conversion is performed. AC power can be supplied to the commercial power supply 50 or the individual load 55.

Therefore, according to this modification, the effects of both of the first and second embodiments can be obtained.

The above embodiments are merely specific examples to aid in understanding the concepts of the invention and are not intended to limit the scope of the invention. The embodiments may be added, deleted or converted with various components without departing from the gist of the present invention.

Although some functional parts have been described in the above-described embodiment, these are only examples of implementation of each functional part. For example, it is possible that a plurality of functional parts described as being mounted on one device may be mounted on a plurality of separate devices, and vice versa. It is also possible that the functional unit is mounted on one device.

Further, the above-mentioned pump-combined hydroelectric power generation device and hydroelectric power generation system may be expressed as shown in the following [1] to [6].

[1] Inverter, motor (generator), and pump (reversing water wheel) in a pump reversing water wheel that uses an inverter-driven motor direct connection pump and pipes the suction port and the discharge port in the opposite direction to generate power. A hydraulic power generator that also serves as a pump that converts the AC power generated from the generator into DC power by using the diode of the inverter section (inverter circuit) that is integrated and connected to the generator (motor) during power generation.

[2] In the above [1], a hydroelectric power generator that also serves as a pump and uses a permanent magnet type synchronous generator (motor).

[3] In the above [1] or [2], the DC power supply unit, which is the intermediate voltage unit of the inverter, has an output terminal (positive side P, negative side N) and is also used as a pump to output the generated DC power supply. Hydroelectric power generator.

[4] In any of the above [1] to [3], the DC power generated from the DC power output terminal is supplied to the power system or individually via a grid interconnection inverter such as a power regeneration converter or a power conditioner. A hydraulic power generator that also serves as a pump to connect to the load.

[5] In any of the above [1] to [4], connect the pipes to the same suction port and discharge port as when using the pump, and if there is a pushing pressure such as a pressure boosting pump directly connected to the water supply, open the valve when the pump is stopped. As a result, a hydroelectric power generator that also serves as a pump that rotates the pump to generate power even if it rotates in the normal direction.

[6] In any of the above [1] to [5], when the storage capacity of the capacitor is exceeded during power generation, electricity is stored in an externally connected storage battery and the electricity stored in the pump drive can be used. A hydroelectric power generator that can also be used as a pump.

[7] An output terminal is provided in the DC intermediate voltage section of the PM motor integrated pump equipped with an inverter, and AC is supplied from the DC power supply from the output terminal by an external power regenerative converter or power conditioner connected to the output terminal. A hydraulic power generation system that creates a power source.

The present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, each embodiment may be carried out in combination as appropriate, in which case the combined effect can be obtained. Further, the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent elements are deleted can be extracted as an invention.

1 ... Pump combined hydraulic power generator, 10 ... Inverter section, 11 ... Rectifier circuit, 11a to 11f, D, d ... Diode, 12 ... Condenser, 13 ... Inverter circuit, 13a ~ 13f, 61 ~ 66 ... Arm, 14 ... Positive side output line, 15 ... Negative side output line, 20 ... Motor combined generator, 30 ... Pump combined reverse water wheel, 31 ... -Suction port, 32 ... Discharge port, 40 ... Same straight line, 50 ... Commercial power supply, 55 ... Individual load, 58 ... Distribution board, 60 ... Grid interconnection inverter, 70 ... storage battery, 80 ... first water storage tank, 81 ... primary side pipe, 82 ... secondary side pipe, 82a ... three-way valve, 82b ... discharge pipe, 82c ... outflow Piping, 83 ... 2nd water storage tank, Tr, tr ... switching element, P ... positive output terminal, N ... negative output terminal.

Claims (9)

An inverter unit including an inverter circuit in which multiple arms in which diodes are connected in antiparallel to a switching element are bridge-connected, and
A generator that also serves as a motor that is electrically connected to the inverter circuit,
It is a pump-combined hydroelectric power generator that is integrally provided with a pump-combined reversing turbine mechanically connected to the motor-combined generator.
The inverter circuit is a pump-combined hydroelectric power generation device that converts an AC power source generated by the motor-combined generator into a DC power source by the diode when the motor-combined generator is driven by the pump-combined reversing water turbine. The pump-combined hydroelectric power generator according to claim 1, wherein the motor-combined generator is a permanent magnet type synchronous motor-combined generator. The pump-combined hydroelectric power generator according to claim 1 or 2, wherein the rotating shaft of the rotor of the motor-combined generator and the rotating shaft of the impeller of the pump-combined reversing turbine are located on the same straight line with each other. The inverter section is
A rectifier circuit that can be electrically connected to a commercial power supply,
A capacitor connected between the positive output line and the negative output line in the rectifier circuit and connected in parallel to the inverter circuit.
The positive output terminal connected to the positive output line,
The negative output terminal connected to the negative output line,
Including
The capacitor smoothes the DC power supply and
The positive output terminal and the negative output terminal output the smoothed DC power supply.
The hydroelectric power generator also used as a pump according to any one of claims 1 to 3. The pump-combined hydroelectric power generation device according to claim 4,
A hydroelectric power generation system including a grid-connected inverter that converts DC power output from the positive output terminal and the negative output terminal into AC power and supplies the converted AC power to the commercial power supply or individual load. .. It is equipped with a suction pipe and a discharge pipe connected to the suction port and the discharge port when the reversing turbine that also serves as a pump is used as a pump.
The hydroelectric power generation system according to claim 5, wherein when a pushing pressure is applied to the impeller of the pump-combined reversing turbine from the suction pipe, the impeller rotates in the normal direction and the motor-combined generator generates an AC power source. The pump-combined hydroelectric power generation device according to any one of claims 1 to 4.
It is equipped with a suction pipe and a discharge pipe connected to the suction port and the discharge port when the reversing turbine that also serves as a pump is used as a pump.
A hydroelectric power generation system in which when a pushing pressure is applied to an impeller of the pump-combined reversing turbine from the suction pipe, the impeller rotates in the normal direction and the motor-combined generator generates an AC power source. Further equipped with a storage battery for storing the DC power output output from the positive output terminal and the negative output terminal.
At the time of power generation, the storage battery stores the DC power source exceeding the storage capacity of the capacitor, and when the pump-cum-reversing water wheel is used as a pump, the stored DC power source is used as the positive side output terminal and the negative side. The hydroelectric power generation system according to any one of claims 5 to 7, which directly or indirectly cites claim 4, which is supplied to the inverter circuit via an output terminal. The pump-combined hydroelectric power generation device according to claim 4,
It is equipped with a storage battery that stores the DC power output output from the positive output terminal and the negative output terminal.
At the time of power generation, the storage battery stores the DC power source exceeding the storage capacity of the capacitor, and when the pump-cum-reversing water wheel is used as a pump, the stored DC power source is used as the positive side output terminal and the negative side. A hydroelectric power generation system that supplies power to the inverter circuit via an output terminal.

Images