JP2004180469A - Generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a generator having a power generation capacity satisfying the load capacity under normal operation in which stabilization control can be carried out instantaneously in response to generation of a starting current in the system. <P>SOLUTION: In a power supply system where power deficiency of a nonutility generator for supplying a system with AC power of commercial frequency obtained by converting power generated from a power generating section 2 through a converter 11 into DC power and then inverting it through an inverter is supplemented with power purchased from a power company, power is supplied from an electric double layer capacitor 4 when power supply is deficient due to generation of a starting current in the system and the power is smoothed thus supplying stabilized power. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power generator that outputs stable power even when a starting current is generated in a system.
[0002]
[Prior art]
Conventionally, as a private power generator, a solar power generator, a wind power generator, a gasoline engine generator, a diesel engine generator, a gas engine generator, a micro turbine generator, and the like have been practically used. In a microturbine generator, a turbine is driven at a high speed of tens of thousands to hundreds of thousands of revolutions per minute to generate high-frequency power, rectifies the high-frequency power with a converter and converts it into DC power, and converts the DC power into an inverter. And converts it to a commercial frequency of 50 Hz or 60 Hz and a commercial voltage of 100 V and supplies it to the system. In addition, in the case of a power outage in which power is not output to the system, the private power generator start-up power supply connects a storage battery to a terminal portion in the power generator where DC power is generated between the converter and the inverter, and outputs the output voltage of the storage battery. This system is used as a power source for starting a microturbine, starts a private power generator, charges a storage battery during normal operation, and stands by.
[0003]
Since this storage battery is connected for starting the power generator in a blackout state where no power is generated in the system, when the power generator starts operating in a steady state and suddenly starts the motor load, etc., a starting current is generated in the system. However, the response to the rapid discharge is slow and the system power changes, and it is not suitable for stable system power supply. As this storage battery, a lead storage battery or the like is generally used, and improvement is desired for stabilizing the voltage of the system. In particular, the generation of the starting current is, for example, when an air conditioner, a refrigerator, a vacuum cleaner, an elevator, an X-ray, etc. are connected to the system, an abnormally high power consumption increase only at this moment due to the rush current at the time of starting the motor. appear. A lead storage battery has a slow response and cannot perform stable power compensation, and when the number of times of charge / discharge is about 200 to 1000, the electrode starts to deteriorate, the storage voltage deteriorates, and it needs to be replaced in 2 to 3 years. Met.
[0004]
In addition, in a distributed power generator of an independent power system, a generator having a large power generation capacity capable of covering a maximum point of the load fluctuation is used in order to absorb a load fluctuation in the system. That is, it is necessary to install a power generation device having a large power generation capacity that can cover a starting current having a magnitude several times larger than the rated value that acts at the time of starting the motor when the motor is loaded. As described above, because of the instantaneous starting current, it is necessary to provide a power generator having a large power generation capacity that can cope with the starting current. The power generation equipment with a large capacity that also absorbs the starting current is operated with a partial load that is a fraction of the power generation capacity during steady-state operation with the longest operation time, and the power generation equipment operating efficiency is extremely poor. However, since the starting current is only generated at the time, the size of the power generation device is increased, the fuel consumption is increased, and the capital investment is expensive.
[0005]
On the other hand, when the capacity of the power generation equipment is set based on the load capacity during the steady operation, the power generator itself trips because it cannot cover the load fluctuation in the system, for example, the starting current when the motor is started. Will be.
[0006]
Furthermore, as a power supply device that supplies power stably, an electric double layer capacitor is connected in parallel to the power storage device so that when a load change or power failure occurs, the electric double layer capacitor first discharges, and then the power storage device There has been proposed a device that supplies power stably from a device (for example, Patent Document 1).
[0007]
In addition, as a power supply device that supplies power stably, an electric double layer capacitor unit is connected to the generated power output line of the gas engine, and the surplus generated power is rapidly charged to the electric double layer capacitor unit to reverse power flow. There has been proposed a device for preventing the occurrence of an image (for example, Patent Document 2).
[0008]
[Patent Document 1]
JP-A-2002-34179 ([0027], FIG. 1).
[Patent Document 2]
JP-A-7-231570 ([0029], FIG. 1).
[0009]
[Problems to be solved by the invention]
However, Patent Literature 1 describes that power is stably supplied by supplying power from a power storage device or an electric double layer capacitor when a fluctuation of a commercial AC power supply load or a power failure occurs. There is no description on stabilization of system power, measures against instantaneous start-up currents, or activation of private generators, etc., in a shared power supply that is used both as a power source and a commercial AC power supply.
[0010]
Similarly, Patent Literature 2 also describes that high-speed stabilization control is performed with respect to a rapid change by an electric double layer capacitor, and the system power of a shared power supply for a private generator and a commercial AC power supply is also described. There is no description about stabilization or starting a private generator. In particular, those who have installed privately-owned generators that have been widely used in hospitals, factories, and homes, say that they are as small and inexpensive as possible, and that they stabilize at high speed even when sudden fluctuations occur in the system. A controllable power generator is desired.
[0011]
The present invention has been made in order to solve such a conventional problem, and is a generator having a power generation capacity that satisfies a load capacity during a steady operation. It is an object of the present invention to provide a power generation device that can perform the power generation.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a generator that satisfies the load capacity during steady operation with the following configuration, and can stabilize and control the system instantaneously even if a starting current is generated in the system. It is intended to provide a power generation device that can be used.
[0013]
That is, the power generator of the present invention converts a generated power into a DC power, converts the DC power into a commercial AC voltage of a commercial frequency, and outputs the commercial AC voltage to a system, and an electric generator connected to a terminal where the DC power is generated. A double-layer capacitor, a commercial power circuit connected to the system for replenishing the power shortage of the private generator output, and a starting current is generated in the system, and when the power supply is insufficient, the electric double-layer capacitor is used. And power supply means for supplying power from the power supply. ADVANTAGE OF THE INVENTION According to this invention, it can comprise so that load capacity in a steady use state may be satisfy | filled by a private generator and a purchased commercial power circuit, and even if the starting current arises in a grid | system, it responds instantaneously and is stabilized. Can be controlled. Further, since the load capacity at the time of steady operation can be configured to satisfy a preset value, it is possible to configure the generator with a small capacity, and to purchase it correspondingly at low cost. Further, the amount of purchased commercial power can be reduced with a minimum contract.
[0014]
Since the electric double layer capacitor is connected to a power supply circuit that supplies power to the private generator via an inverter that converts DC power into AC power for starting the private generator when the private generator is started, It can be used not only for stabilizing the voltage of the system with respect to the starting current but also as a power source for starting the private generator, so that the private generator can be started even without purchased commercial power. When used as a start-up power source, the power generation unit can be started instantly anywhere.
[0015]
Since the electric double layer capacitor is a dedicated circuit for charging and discharging each of which charges from the system and discharges to the DC circuit, it is possible to stabilize against a load change by discharging while charging, and during charging. The system voltage can be stabilized even if a load fluctuation occurs.
[0016]
Since the electric double layer capacitor and the storage battery are connected to the terminal where the DC power is generated, when the electric power is generated instantaneously as in a starting current, the electric double layer capacitor stabilizes and compensates for a long period. In case of negotiation, it can be guaranteed by sharing the storage battery.
[0017]
A power generation unit for generating AC power, a converter connected to an output terminal of the power generation unit for converting the AC power to DC power, and a DC power supply connected to an output terminal of the converter and converting the DC power to a commercial frequency. An inverter that converts the DC power of the converter output, the electric double layer capacitor connected to the terminal of the DC power at which the DC power of the converter output is generated, and a connection portion of the electric double layer capacitor and the terminal at which the DC power is generated, and A first switching circuit connected between the converter output terminal, a second switching circuit connected to the output terminal of the inverter, and a connection between the second switching circuit and the output terminal of the inverter; And a starter circuit for the power generation unit, so that the generator is started by the electric double layer capacitor simply by operating the first and second switching circuits. It can be.
[0018]
The terminals that generate the DC power include substantially the same circuit that generates the DC power, wiring that generates the DC power, and the like.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a power generation device of the present invention will be described with reference to FIGS.
In this embodiment, when a starting current is generated in the system, the electric double layer capacitor instantaneously compensates and supplies stable power, and a private power generation unit having a power generation capacity that satisfies a load capacity during a steady operation and a commercial power purchaser. This is an example in which electric power is shared so as to be supplied with electric power, and the amount of purchased electric power can be reduced to a minimum contract. That is, by allowing the electric double layer capacitor to compensate for large load fluctuations that occur instantaneously and suddenly in the system, the private power generation unit and the purchased commercial power can be selected to a capacity that satisfies only the load capacity during steady operation. Therefore, the amount of purchased commercial power can be minimized, the size can be reduced, and the capital investment can be reduced. Further, the private power generation unit including the electric double layer capacitor can be incorporated in one housing.
[0020]
This embodiment will be described with reference to FIGS. The power generation device 1 includes a power generation unit 2 that generates high-frequency AC power, a commercial frequency power output circuit 3, an electric double layer capacitor 4, a commercial power output circuit 5, and a power supply control circuit 6, which are It is incorporated in one case. The private power generator includes a power generation unit 2 and a commercial frequency power output circuit 3.
[0021]
The power generation unit 2 is an AC generator for private power generation installed in factories, hospitals, government offices, homes, and the like, such as a gasoline engine, a diesel engine, and a micro gas turbine.
[0022]
The commercial frequency power output circuit 3 includes a converter 11 that converts high-frequency AC power generated by the power generation unit 2 into DC power, an inverter 12 that converts DC power into AC power having a commercial frequency of, for example, 50 Hz and a commercial voltage of, for example, 100 V, And a commercial frequency power circuit 13.
[0023]
The charge / discharge circuit of the electric double layer capacitor 4 is connected to a terminal for generating DC power between the output terminal of the converter 11 and the input terminal of the inverter 12, for example, a DC power line 15, and is charged with DC power from the DC power line 15 and The charging voltage is discharged to the DC power line 15 side. That is, the electric double layer capacitor 4 is charged while the power generation unit 2 is generating power in a steady operation, and is discharged from the electric double layer capacitor 4 when a starting current such as a load change is generated in the system 7 and smoothed. The characteristics of the electric double layer capacitor 4 are that it has a low internal resistance, so it has a rapid charge / discharge, a long life, a high charge / discharge efficiency, can operate even in a low temperature environment, has excellent safety, requires no maintenance, has low pollution, and has a high efficiency power storage. is there. The electric double layer capacitor 4 is composed of a polarizable electrode and an electrolytic solution and accumulates electric charge of the electric double layer formed at the interface between the polarizable electrode and the electrolytic solution. is there. The shape of the electric double layer capacitor 4 is selected to be a shape such as a cylindrical shape, a film type, a coin type, etc., which is appropriately stored in a housing. The electric double layer capacitor 4 connects a plurality of electric double layer capacitors 4 in series to increase the output voltage, or connects a plurality of electric double layer capacitors 4 in parallel to increase the storage power capacity. Can be configured. The electric double layer capacitor 4 supplies power to the system 7 and smoothes it when a starting current is generated in the system 7 and an insufficient power supply occurs.
[0024]
The commercial power output circuit 5 is a commercial power circuit for replenishing by purchasing power from the power company when the power from the power generation unit 2 is insufficient, and is a circuit to which power contracted with the power company is supplied. A commercial frequency of 50 Hz and a commercial voltage of 100 V are output. The power supply control circuit 6 detects, for example, when the power consumption of the system increases and the power generation capacity from the power generation unit 2 becomes insufficient due to an increase in the power consumption of the system from the nighttime when the power consumption is low to the daytime when the power consumption is large. This is a circuit for performing control to supplement with electric power from the commercial power output circuit 5. The power supply control circuit 6 is connected to a power meter 21 for measuring the power flowing to the output terminal of the commercial frequency power output circuit 3.
[0025]
The power meter 21 monitors the power consumption of the power generated by the power generation unit 2 and detects when the power generation unit 2 reaches a predetermined maximum power generation capacity value. A control circuit 22 for controlling the power so as to supply the power to the system 7 is connected. The output terminal of the control circuit 22 is controlled to be in a conductive state so as to output commercial power to the system 7 when the power meter 21 detects that the power generation capacity of the power generation unit 2 has reached a predetermined value. Switching circuit 23 is connected.
[0026]
The total power amount of the power generation capacity of the power generation unit 2 of the power generation device 1 and the commercial power amount by the power purchase is an amount of power that covers the maximum power consumption of the steady power consumption. In such a power generator 1, when a starting current is generated in the system 7, the electric double layer capacitor 4 discharges the electric power to the system 7 via the inverter 12 and the commercial frequency power circuit 13 to smooth the starting current. The power is supplied by the power supply means.
[0027]
FIG. 2 illustrates these functions, in which the vertical axis represents power consumption and the horizontal axis represents time. In FIG. 2, a straight line 31 indicates a rated power generation amount when the private power generation unit 2 is operated, and a straight line 32 indicates a shortage of power consumption with respect to the current rated power generation amount by a power supply contracted in advance from a power company. Shows the total electric energy obtained by adding. The load fluctuation curve 33 is a power consumption waveform diagram showing a load fluctuation state occurring in the system 7. A starting current generated instantaneously when a switch of the air conditioner is input at a certain time is shown by a waveform 34. . The contract power amount with the power company is the power amount of the difference between the power consumption amounts of the straight line 32 and the straight line 31. The electric energy indicating the load capacity during the steady operation is electric power in a period excluding the time when the waveform 34 occurs in the load fluctuation curve 33.
[0028]
As can be seen from FIG. 2, most of the time on the load fluctuation curve 33 is the amount of power that is insufficient in the in-house rated power generation, and can be satisfied by adding the power contracted with the power company. However, the power generation device 1 is a device that compensates for the instantaneous power shortage by discharging the stored power from the electric double layer capacitor 4 because the instantaneously generated waveform 34 becomes short of power.
[0029]
Next, the operation of FIG. 1 will be described with reference to the waveform diagram of FIG. In the load fluctuation curve 33, the power consumption is detected by the wattmeter 21 and output to the control circuit 22 until the time a when the power consumption is equal to or less than the straight line 31 as at night, and the control circuit 22 Is controlled to be in a non-conducting state to cut off the supply of commercial power. Therefore, until the period a, the load capacity can be satisfied only with the straight line 31 of the amount of electric power generated by operating the power generation unit 2 and can be covered with a margin. In the morning, when the devices start to operate little by little, the power consumption increases, and from time a to time b, the power is insufficient only with the straight line 31 of the private power generation, so that the load capacity cannot be satisfied. Is detected by the wattmeter 21, the control circuit 22 is operated to control the switching circuit 23 to be in a conductive state, and the commercial power from the commercial power output circuit 5 is supplied to the system 7. In this way, the power generator 1 can supply power satisfying the load capacity during steady operation.
[0030]
At time b, if the refrigerator suddenly operates, a starting current is generated in the system 7 at this time, and the load fluctuation curve 33 becomes a waveform on which the waveform 34 is superimposed. When the surge power exceeds the total power obtained by adding the contract power with the power company to the power generated by the private generator, the excess power is instantaneously compensated by the power supply means. The power supply means is a means for rapidly discharging and compensating the electric power from the electric double layer capacitor 4 to the system 7 via the inverter 12, the commercial frequency power circuit 13, and the power meter 21.
[0031]
At the time c when the waveform 34 disappears, the power consumption of the system 7 becomes less than the straight line 32, so that the straight line 31 of the rated generated power of the private power generation and the straight line 32 of the added power of the contracted power with the power company are satisfied. The power meter 21 outputs what can be done. In this way, the power generation device 1 can compensate for the in-house generated power, the commercial power, and the stored power of the electric double layer capacitor 4, and can supply stable power to the system 7. In FIG. 2, the steady operation refers to a load change during a period from time b to a time c to a time d in the load change curve 33. The waveform 34 from the time point b to the time point c is a load change that occurs only suddenly and instantaneously, and is distinguished from the steady operation.
[0032]
It is desirable that the configuration of the power generation unit 2 to be installed be designed so as to satisfy the rated load capacity during the steady operation as much as possible and to operate at a point where the power generation efficiency is high during the steady operation. The power generating device 1 has an electric double layer capacitor 4 capable of rapidly discharging in a short time connected to a DC power portion of an output terminal of the converter 11, and the electric double layer capacitor 4 has a power generating unit 2 and a rated capacity at a steady load capacity. The electric double layer capacitor 4 is capable of compensating for a short-time large current in which an instantaneous starting current of the motor or the like that cannot be covered by the added electric power amount of the contract commercial electric power amount flows.
[0033]
In the above-described embodiment, an example in which the electric double layer capacitor 4 is used for stabilizing power at the time of generation of a starting current has been described. However, the electric double layer capacitor 4 may be used as a power source for starting the power generation unit 2.
[0034]
Next, an embodiment in which the power generation unit 2 is used as a power source for starting the microturbine 41 will be described with reference to FIG. 1 and 2 are given the same reference numerals in FIG. 3, and the detailed description thereof will be omitted because they are duplicated. FIG. 3 omits the commercial power output circuit 5, the power supply control circuit 6, and the circuit 7 in FIG.
[0035]
The power generation unit 2 is, for example, a micro turbine 41 that generates AC power. A commercial frequency power output circuit 3 for outputting commercial frequency power is connected to a generated power output terminal of the microturbine 41. The microturbine 41 includes a gas turbine 42 in which a turbine rotor blade 49 rotates at high speed by the power of combustion gas, a generator 45 in which a rotation shaft 44 is directly connected to a rotation shaft 43 of the gas turbine 42 to generate high-speed rotation and generate power, And a filter 46 for inhaling and filtering air for use. The gas turbine 42 compresses the air sucked in through the filter 46 and sends the compressed air to a combustor 50, and heats the compressed air. It is composed of a combustor 50 that is supplied and burns to generate combustion gas for rotating the turbine rotor blades 49, and a turbine rotor blade 49 that rotates at high speed by the power of the combustion gas after starting by the starting power.
[0036]
The generator 45 includes a stator 51 having a rotating shaft 44 integrally connected to the rotating shaft 43 of the turbine rotating blade 49, and a cylindrical fixed coil 52 electromagnetically coupled to the stator 51 to output generated power. Consists of The compressor 48 inhales air through the filter 46 by rotating the rotation shaft 43 when the turbine rotor blades 49 rotate, and rotates the fan coupled to the rotation shaft 43 to compress the air. It is a compressor.
[0037]
The commercial frequency power output circuit 3 is connected to the output terminal of the fixed coil 52, and includes a converter 11, an inverter 12, an electric double layer capacitor 4, a transformer 56, and a circuit breaker 57. The transformer 56 is a device for converting a voltage obtained by converting DC power into AC power of a commercial frequency by the inverter 12 into a commercial voltage of, for example, 100 V. The circuit breaker 57 is a device that controls ON / OFF of the output power of the microturbine 41. The commercial frequency power output circuit 3 having such a configuration includes a power supply circuit for starting the micro turbine 41. This power supply circuit is a starting power supply circuit that supplies AC power at the time of starting the microturbine 41. The power supply power at the time of starting the microturbine 41 is supplied to, for example, a turbine rotor blade driving circuit such as a motor for rotating the turbine rotor blade 49.
[0038]
In the start-up power supply circuit, a first switch 61 is connected between an output terminal of the converter 11 and an input terminal of the electric double layer capacitor 4, and further, a first switch 61 is connected between an output terminal of the inverter 12 and an input terminal of the transformer 56. , A second switch 62 is connected, and the other terminal of the second switch 62 is connected to an input terminal of a motor for rotatingly starting a turbine rotor blade 49 which is a starting circuit of a power generation unit. . It is desirable that the first and second switches 61 and 62 have a dual interlocking switch function. When starting the turbine rotor blades 49, the start-up power supply circuit operates the first and second switches 61 and 62 in a non-conducting state to discharge the DC power stored in the output of the electric double layer capacitor 4. Is a circuit that utilizes
[0039]
The DC power output from the electric double layer capacitor 4 is converted by the inverter 12 into motor driving AC power for rotating the turbine rotor blades 49, and the turbine rotor blades 49 are rotated. The rotation of the turbine rotor blades 49 rotates a fan of a compressor 48 connected to the rotating shaft 43, and the compressor 48 draws air from the filter 46 to generate compressed air. The compressed air is sent to the combustor 50, and combusts with the city gas of the fuel gas in the combustor 50 to generate a combustion gas. Since this combustion gas rotates the turbine rotor blades 49 just started at a high speed, the supply of the starting power is stopped. In the operation of stopping the supply of the starting power, the supply of the starting power is stopped by operating the first and second switches 61 and 62 in a conductive state. In addition, the start-up power of the turbine rotor 49 output from the inverter 12 is gradually increased to facilitate the start of the turbine rotor 49.
[0040]
Next, the operation of FIG. 3 will be described.
First, the microturbine 41 is started. Activation of the microturbine 41 operates the first and second switches 61 and 62 in a non-conductive state. As a result, a discharge circuit in which a DC voltage is input from the electric double layer capacitor 4 to the inverter 12 is formed, and the inverter 12 outputs AC power for starting the turbine rotor blades 49. As a result, the turbine rotor 49 rotates, and the fan of the compressor 48 connected to the rotating shaft 43 of the turbine rotor 49 rotates. As a result, the compressor 48 sucks air from the filter 46, compresses the air, and sends the compressed air to the combustor 50.
[0041]
The combustor 50 burns the city gas with the compressed air, generates a combustion gas, and sends the combustion gas to the turbine rotor 49. The turbine rotor blades 49 at the initial stage of rotation rotate at high speed by the power of the combustion gas. At this time, the first and second switches 61 and 62 are operated in a conductive state, and the supply of the starting power by the electric double layer capacitor 4 is stopped. Such a start operation of the microturbine 41 is an open / close operation of the first and second switches 61 and 62, and can be automated. In the automation means, the operation of stopping the supply of the start-up power can be executed by a computer, for example, a microcomputer, by the high-speed rotation of the turbine rotor blades 49 after the supply of the start-up power.
[0042]
Since a short-time load such as the starting current of the motor for the turbine rotor blade 49 can be covered by the power storage system from the electric double layer capacitor 4, the short-time load such as the starting current of the motor can be reduced when setting the contract power amount with the power company. A contract can be made with a steady amount of power consumption without adding a load, and an economic contract can be made to reduce a power fee paid to a power company.
[0043]
In the above-described embodiment, the circuit of the converter 11 and the inverter 12 for outputting the commercial frequency power is switched and used as the supply means of the starting power for the microturbine 41 by the electric double layer capacitor 4, but the microturbine 41 is started. Power supply circuit may be provided independently.
[0044]
Next, another embodiment in which a starting power supply circuit using the electric double layer capacitor 4 is provided independently will be described with reference to FIG. 1 to 3 and FIG. 4 are denoted by the same reference numerals, and the detailed description thereof will be omitted because they are duplicated.
[0045]
The discharge terminal 71 of the electric double layer capacitor 4 is connected to one end of a switch 72 that is turned on only at the time of startup, and the other end of the switch 72 converts DC power into AC power for starting the microturbine 41. The inverter 73 is connected. The starting AC power output from the inverter 73 is connected so as to be supplied to a motor for rotating, for example, a turbine rotor blade 49 of the microturbine 41. The starting circuit is a circuit including the switch 72 and the inverter 73.
[0046]
As a result, DC power is output from the electric double layer capacitor 4 to the inverter 73 only when the switch 72 is operated in the conductive state, and the inverter 73 uses the AC power for starting the micro turbine 41 to rotate the turbine rotor blades 49. Output to the motor. In this way, the turbine rotor blades 49 rotate, and a large amount of combustion gas is generated. When the turbine rotor blades 49 rotate at high speed by the power of the combustion gas, the switch 72 is operated to be in a non-conductive state, and The start operation of the turbine 41 ends. The electric double layer capacitor 4 is charged by the DC power output from the converter 11 when the power generation of the microturbine 41 reaches a steady state.
[0047]
In the above-described embodiment, the embodiment in which the power for starting the microturbine 41 is supplied only from the electric double layer capacitor 4 having the rapid charge / discharge characteristics has been described. However, it is desired to operate power generation for private use immediately when commercial power is interrupted. In this case, the configuration can be made as follows. When the commercial power is interrupted, the rotation of the turbine rotor 49 is started by the electric power from the electric double layer capacitor 4 having a rapid discharge characteristic, and then the electric power from the storage battery 74 is also supplied to the turbine rotor 49. Is also good.
[0048]
Next, this embodiment will be described with reference to FIG. The same reference numerals are given to FIG. 5 for the same parts as those in FIGS.
[0049]
A storage battery 74 is connected to the electric double layer capacitor 4 in parallel. That is, the electric double layer capacitor 4 and the storage battery 74 are connected so that charging is performed from the output terminal of the converter 11 and discharging is performed at one end of the switch 72. The starting circuit is a circuit including the switch 72 and the inverter 73. As described above, the parallel connection circuit of the electric double-layer capacitor 4 and the storage battery 74 operates the switch 72 first in a conductive state when, for example, commercial power is cut off and the micro turbine 41 of the private generator is to be started quickly, The turbine rotor blades 49 are started by the DC power from the electric double layer capacitor 4, and thereafter, the DC power from the storage battery 74 or the storage power from both is supplied to the turbine rotor blade 49 starting motor to supply the turbine rotor blades 49. 49 can be rotated at high speed. In this configuration, the expensive electric double layer capacitor 4 can be configured to be relatively small.
[0050]
Thereafter, when a starting current is generated in the system 7 in a state where the microturbine 41 is in a steady power generation operation, DC power is instantaneously supplied from the electric double layer capacitor 4 to compensate the power.
[0051]
The power generator 1 according to the circuit configuration diagram of FIG. 5 is not limited to the backup power supply at the time of power failure, and may use the storage battery 74 as a power supply for starting the turbine rotor 49 of the microturbine 41 when urgency is not required. it can. That is, when the microturbine 41 is started, the power is supplied from the storage battery 74 to start the turbine rotor blades 49, and the electric power is instantaneously used as power compensation when a starting current is generated in the system 7 during power generation in a steady state. DC power may be supplied from the multilayer capacitor 4. Examples of the storage battery 74 include a sodium-sulfur battery (NAS battery), a secondary battery using a vanadium-based electrolyte (Redox flow battery), a secondary battery using a sodium-based electrolyte (REGENESYS battery), and a superconducting power storage system. and so on.
[0052]
In the above-described embodiment, an example has been described in which a current for charging flows from the output terminal of the converter 11 as charging of the electric double layer capacitor 4, but a charging current may flow from the system 7.
[0053]
Next, an embodiment in which the charging current flows from the system 7 will be described with reference to FIGS. 1 to 5 are given the same reference numerals as in FIGS. 6 and 7, and the detailed description thereof is omitted because they are duplicated. 6 and 7, the commercial power output circuit 5, the power supply control circuit 6, and the commercial power supply circuit of the system 7 in FIG. 1 are omitted.
[0054]
The system 7 that outputs the commercial voltage at the commercial frequency is connected to the electric double layer capacitor 4 via the charger 77 so that the charging current flows through the electric double layer capacitor 4, and the discharge current of the electric double layer capacitor 4 is supplied to the input terminal of the inverter 12. A charging / discharging circuit is provided so as to flow through. In the charging / discharging circuit, since the charging current flows directly from the system 7 where the starting current is generated to the electric double layer capacitor 4 as described above, the generation of the starting current can be suppressed and smoothed while charging. The charger 77 is, for example, a rectifier circuit for converting AC power generated in the system 7 into DC power.
[0055]
A series connection circuit of the charger 78 and the storage battery 79 can be connected in parallel to a series connection circuit of the electric double layer capacitor 4 and the charger 77 of the power generation device 1 of FIG. FIG. 7 shows this embodiment. When a starting current is generated in the system 7, the electric double layer capacitor 4 responds instantaneously to the electric double layer capacitor 4. The electric double layer capacitor 4 discharges DC power to the inverter 12, and the inverter 12 compensates for the starting current. Is converted into AC power to supply stable power to the system 7. Further, when the starting current is large and the compensation power is insufficient, the storage battery 79 also outputs so as to supplement the DC power. Charger 78 is a circuit having a converter function for converting AC power generated in system 7 into DC power.
[0056]
In the above embodiment, a micro turbine is described as the power generation unit 2. However, a micro gas turbine generator, a micro steam turbine generator, a gasoline engine generator, a diesel engine generator, a wind power generator, a solar cell generator, a fuel cell generator For example, the invention can be applied to any generator for private use.
[0057]
As described above, according to the above-described embodiment, even if the power of the load circuit of the power generator 1, that is, the power of the system 7 suddenly fluctuates instantaneously, the response is smoothed immediately, and the stable output power is always used. it can. Furthermore, a power generation device 1 that can generate a stable power control in the system 7 by responding instantaneously even when a starting current is generated in the system 7 with a power generation facility having a power generation capacity that satisfies the load capacity at the time of steady operation. Obtainable. Furthermore, since it is only necessary to provide the power generating unit 2 that satisfies the rated load capacity of the private generator at the time of steady operation, it is necessary to install the power generating unit 2 having a large load capacity at a low cost only for an instant. Absent. Furthermore, the power generation device 1 is an effective system when owning a private power generation facility, cooperating with a power company via the system 7, and operating the private power generation facility and purchased commercial power in combination. Furthermore, since a short-time load such as a starting current for starting the motor for the turbine rotor blade can be covered by the stored power from the electric double layer capacitor 4, the starting current of the motor can be reduced when setting a contract electric power amount with an electric power company. It is possible to make a contract with an economical amount of electric power that does not add a short-time load, such as a short-time load, and to make an economical contract that can reduce the electric power fee paid to the electric power company.
[0058]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, stabilization control can be performed in an instantaneous response even if a starting current is generated in a system with a generator having a power generation capacity that satisfies a load capacity during a steady operation.
[Brief description of the drawings]
FIG. 1 is a circuit configuration diagram for explaining an embodiment of a power generation device of the present invention.
FIG. 2 is a characteristic diagram for explaining the relationship between the amount of power generated by the private generator in FIG. 1, the amount of contract power with a power company, and the amount of load-variable power consumption.
FIG. 3 is a circuit configuration diagram for explaining another embodiment of FIG. 1;
FIG. 4 is a circuit configuration diagram for explaining another embodiment of FIG. 1;
FIG. 5 is a circuit configuration diagram for explaining another embodiment of FIG. 1;
FIG. 6 is a circuit configuration diagram for explaining another embodiment of FIG. 1;
FIG. 7 is a circuit configuration diagram for explaining another embodiment of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Power generation apparatus, 2 ... Power generation part, 3 ... Commercial frequency power output circuit, 4 ... Electric double layer capacitor, 5 ... Commercial power output circuit, 6 ... Power supply control circuit, 7 ... System, 11 ... Converter, 12, 73 ... Inverter, 13 ... Commercial frequency power circuit, 15 ... DC power line, 21 ... Wattmeter, 22 ... Control circuit, 23 ... Switching circuit, 31, 32 ... Line, 33 ... Load fluctuation curve, 34 ... Waveform, 41 ... Micro turbine , 42 ... gas turbine, 43, 44 ... rotating shaft, 45 ... generator, 46 ... filter, 47, 50 ... combustor, 48 ... compressor, 49 ... turbine rotor blade, 51 ... rotating coil, 52 ... fixed coil, 56: Transformer, 57: Breaker, 61, 62, 72: Switch, 71: Discharge terminal, 74, 79: Storage battery, 77, 78: Charger.

Claims (5)

A private power generator that converts the generated power into DC power, converts this DC current into a commercial AC voltage of a commercial frequency, and outputs it to the grid,
An electric double layer capacitor connected to a terminal where the DC power is generated,
A commercial power circuit connected to the grid to replenish the power shortage of the private generator output,
A power supply means for supplying power from the electric double layer capacitor when a starting current is generated in the system and a power supply shortage occurs. The electric double layer capacitor is connected to a power supply circuit that supplies power to the private generator via an inverter that converts DC power into AC power for starting the private generator when the private generator is started. The power generator according to claim 1, characterized in that: 3. The power generator according to claim 1, wherein the electric double layer capacitor is connected to a charge / discharge circuit that charges from the system and discharges the DC circuit. 4. The power generator according to any one of claims 1 to 3, wherein the electric double layer capacitor and a storage battery are connected to a terminal where the DC power is generated. A power generation unit for generating AC power,
A converter connected to an output terminal of the power generation unit and converting the AC power to DC power;
An inverter connected to an output terminal of the converter and converting the DC power into a commercial AC voltage having a commercial frequency;
The electric double layer capacitor connected to a terminal where the DC power of the converter output is generated,
A first switching circuit connected between the electric double layer capacitor and a connection part of a terminal where the DC power is generated and the converter output terminal;
A second switching circuit connected to an output terminal of the inverter;
The power generator according to any one of claims 1 to 4, comprising: the second switching circuit; and a starter circuit of the power generator connected to a connection between an output terminal of the inverter and the power generator. .

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