JP5072394B2 - Cogeneration equipment - Google Patents

Description

  The present invention relates to a cogeneration apparatus, and more particularly, to a cogeneration apparatus that can start an engine at the time of a power failure so that exhaust heat can be used or generated even at the time of a power failure.

  Recent cogeneration systems use an engine that uses relatively clean energy such as city gas and natural gas to drive the generator, and use the heat generated by the engine and surplus power to warm the cooling water and exchange heat. Since the efficiency decreases when the exhaust heat can be used or the engine is operated at a low output, it is operated at a rating of, for example, 1 kW during operation, and the commercial power system is adapted to the fluctuations in the load of the power usage device in the home. It is possible to use waste heat and supply power while being connected.

  Such a cogeneration device is disclosed in, for example, Patent Document 1, in which a current sensor is provided in a commercial system, a power storage device and a surplus power consumption heater are provided on the power usage device side, and a current amount of the commercial system is detected by the current sensor. For the hot water supply, the power is stored in the power storage means and the surplus power consumption heater is operated so that the surplus power of the generator does not flow backward to the commercial system when the power used by the power generator is small. A cogeneration device is shown that is capable of heating.

  This will be briefly described with reference to FIG. 4. In the figure, 50A, 50B, 50C,... Are power consuming devices provided at power consuming locations such as ordinary households, 52 generates heat and power as power generation means, The combined heat and power supply device that supplies power to the plurality of power consuming devices 50 includes a generator 52g and a gas engine 52e that drives the generator 52g, and is configured to generate AC power. 53 is an operation control unit for controlling the operation of the cogeneration system, 54 is an inverter for setting the output power of the generator 52g to the same voltage and frequency as the power supplied from the commercial system 60, and 55 is a plurality of power consuming devices 50. A storage battery 56 is provided in some of the power consuming devices 50 to prevent the surplus power generated by the generator 52g from flowing back to the commercial system 60 and to store the power consumed by itself. It is a charge / discharge control unit that performs control to store electric power in the storage battery 55 or to discharge the electric power from the storage battery 55.

  57 is an electric heater that warms water using this surplus power when the electric power generated by the combined heat and power supply device 52 cannot be used even by charging the power consuming devices 50A, 50B, 50C,. For example, a heater that consumes about the same power as the output power 1 KW of the generator 52 g is used. 58 is a direct current power supply unit that converts alternating current to direct current in order to store surplus power in the storage battery 55, 59 is a charge intermittent switch that switches between a charged state of the storage battery 55 and an operating state that consumes the stored power, and 60 is an external power supply As a commercial system, 61 is a distribution board provided in the home, 62 is a commercial line, 63 is a power supply line, 64 is a current flowing through the commercial line 62, and detects whether a reverse power flow occurs. A current sensor, 65 is a heater distribution line, 66 is a switching circuit for adjusting electric power supplied to the electric heater 57, 67 is a cooling water circulation path, and 68 is a cooling water circulation pump. Although not shown, the hot water heated by the gas engine 52e and the electric heater 57 through the cooling water circulation path 67 is stored in a hot water storage tank or the like, supplied to a heating terminal or the like, and used for indoor heating or the like. The

  In this cogeneration system, the electric power generated by the generator 52g driven by the gas engine 52e is aligned by the grid interconnection inverter 54 so that the voltage and frequency are the same as those of the commercial system 60, and the feed line 63 Sent out. On the other hand, the exhaust heat of the gas engine 52e warms the cooling water sent from the cooling water circulation pump 68 through the cooling water circulation path 67, and is also generated by the generator 52g to generate power consumption devices 50A, 50B, 50C,. It is heated by an electric heater 57 that is driven by surplus electric power that has not been used up and is stored in a hot water storage tank (not shown) or supplied to a heating terminal or the like for indoor heating or the like.

  Then, the electric heater 57 is driven by surplus electric power when the operation control unit 53 receives a signal from the current sensor 64 that measures the current flowing through the commercial line 62 so that the generated power of the generator 52g does not flow backward to the commercial system 60 side. However, the switching circuit 66 is controlled to adjust the power supply.

  That is, when there is no surplus power in the combined heat and power supply device 52, a current from the commercial system 60 (hereinafter referred to as positive current) is detected through the current sensor 64, but when surplus power is generated in the combined heat and power supply device 52, the current sensor The positive current value of 64 is not detected. Therefore, the operation control unit 53 controls the switching circuit 66 so that when the forward current value detected by the current sensor 64 tends to decrease, the forward current value becomes the set lower limit current value for preventing reverse power flow. Is configured to do.

  Such a cogeneration system generally includes, for example, a hot water supply unit that uses exhaust heat from the combined heat and power supply device 52 and the engine, and an operation control unit that controls the combined heat and power supply device 52 and the hot water supply unit. A power generation / hot water supply unit including 53 and the like is provided.

  Moreover, the engine which comprises the cogeneration apparatus 52 in such a cogeneration apparatus is normally started using the cell motor which operate | moves with a battery similarly to a car etc., or the cell motor which rotates by obtaining electric power from the connected system | strain is used. It is used to start up.

  However, if a cell motor that operates on a battery is used, as in a car, etc., the cogeneration apparatus becomes large in size and costs increase. Therefore, in many cases, the cell motor is rotated by obtaining electric power from an interconnected system. However, in this case, the engine cannot be started at the time of a power failure. For example, even when a power failure occurs due to a disaster or the like, but only gas is supplied, exhaust heat utilization and power supply cannot be performed. However, there is a device that can use gas and use exhaust heat and supply power, but it cannot be used.

  In order to solve these problems, for example, Patent Document 2 includes a generator that is rotated by an engine and can also be used as an engine starter motor, and the output of the generator is converted to direct current by a drive inverter and then a DC regulator and an inverter In a cogeneration system having a power generation unit connected to an electrical load from a switchboard by connecting to a commercial system via an ATS including a breaker for disconnection A battery of about 12V is connected between the inverter and the DC regulator via a bidirectional DC-DC converter, and when the engine is started, the voltage is boosted by the bidirectional DC-DC converter and the generator is motored. If the remaining power is left, the battery can be charged by stepping down using a bidirectional DC-DC converter. And to so that, the cogeneration unit that was to be able to power even during a power failure has been proposed.

JP 2006-158148 A JP 2006-121888 A

  However, in the cogeneration apparatus disclosed in Patent Document 2, the engine is always started by motoring a generator with a battery and a bidirectional DC-DC converter, and is connected to a commercial system and during a power failure. If a single ATS is used for disconnecting the battery and connecting to the power usage device, the battery will be consumed quickly, and if there is not much concern about a power outage, the battery and bidirectional DC-DC converter will be used. The cost is increased by the amount of the switch connected to the device.

  Therefore, in the present invention, a generator that can also be used as an engine starting motor is provided, a battery of about 12V is connected between the inverter for interconnection with the external power source and the driving inverter via a bidirectional DC-DC converter, and a power failure occurs. In a cogeneration system that starts up the engine by boosting the voltage with a bi-directional DC-DC converter and starting the engine, if the battery consumption is as low as possible and there is not much concern about power failure, cogeneration It is an object to provide a cogeneration apparatus that can suppress the price of the apparatus.

The cogeneration apparatus according to the present invention for solving the above problems is
A power generation unit connected to an external power source and a power usage device, the power generation unit being connected between the power generation means usable as the engine and the motor for starting the engine, and the power generation means and the external power source; The bidirectional AC / DC converting means for converting the output of the power generation means to DC, and the first DC / AC converting means for converting the converted DC into AC that can be linked to an external power source. In a cogeneration apparatus in which a battery is connected between the DC / DC converter and the first DC / AC converter via the bidirectional DC / DC converter,
The engine is started by an external power source supplied to the power generation means via the first DC / AC conversion means and the bidirectional AC / DC conversion means at the time of a power failure, and the bidirectional DC / DC conversion means Connected to the bidirectional AC / DC converting means side is a second DC / AC converting means for setting the bidirectional AC / DC converting means output to the voltage and frequency of the external power source, and both of the battery outputs at the time of power failure. Boosting with a direct current / direct current conversion means, motoring the power generation means via the bidirectional alternating current / direct current conversion means to start the engine, and separately from a switchboard connected to a commercial system, the power failure switchboard for driving the cooling water circulation pump of the waste heat utilization device is provided in the event of a power failure, including the power failure power distribution board constitutes a power failure unit,該停electrostatic unit, the second DC / AC conversion means and back With an integral and Li and bidirectional DC / DC converting means, characterized by being configured as a panel having a switch provided with detachable option to start the engine in the event of a power failure.

  In this way, starting the engine with an external power supply during a non-power failure, and with a battery during a power failure, the battery is consumed only during a power failure, so that the consumption of the battery is suppressed, and the power usage device Since power is supplied to the second DC / AC converter, it is sufficient to provide only a breaker for disconnection on the connection side with the external power source in the cogeneration system. It can be configured to reduce the price of the cogeneration device.

  In addition, by integrating the second DC / AC conversion means, the battery, and the bidirectional DC / DC conversion means, and providing a panel having a switch for starting the engine at the time of a power failure, as an option that can be attached and detached, The user can turn on the power of the cogeneration device with the switch provided as an option at the time of a power failure and can use the power, and the price of the main body of the cogeneration device can be kept low, and the spread of the cogeneration device can be measured accordingly. .

  And the surplus that is connected to the bidirectional AC / DC converting means side of the first DC / AC converting means and consumes the amount of power generated by the power generating means that exceeds the amount of power used by the power usage device Power consumption means is provided, and by making the surplus power consumption means a heater as a heating means of the exhaust heat utilization device in the cogeneration device, it can be a cogeneration device that can use the exhaust heat even during a power failure, Furthermore, in general, an engine in such a cogeneration system is tuned with a constant rating from the viewpoint of vibration and noise, but the load during a power outage is not always constant, so surplus power is consumed by a surplus power heater. As a result, the engine can be driven at a constant output, and the engine can be operated under such a condition (low noise) that noise and noise countermeasures are taken.

  Further, the bidirectional DC / DC converting means has a step-down function for charging the battery with surplus power of the power generating means, and the battery integrates and measures the power consumed by the motoring of the power generating means and the charging current. Since the current sensor is connected and the control means provided on the option side that predicts the life of the battery and displays it on the display device is provided, the battery can always be prepared in an emergency as a fully charged state. In addition, since it is possible to know the replacement time of the battery, it is possible to prevent a situation where the engine cannot be started in an emergency.

  As described above, according to the present invention, it is possible to provide a cogeneration device that can use exhaust heat and supply power even during a power failure at a low cost, and to notify the replacement timing while keeping the battery that starts the engine low during a power failure. Therefore, it is possible to provide a cogeneration apparatus that can prevent a situation where the engine cannot be started in an emergency.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, as long as there is no specific description, the shape of the component described in this embodiment, its relative arrangement, and the like are not intended to limit the scope of the present invention, but are merely illustrative examples.

  FIG. 1 is a schematic block diagram showing an engine unit for generating power and a power failure option in the cogeneration apparatus according to the present invention, FIG. 2 is a schematic block diagram of the entire cogeneration apparatus of the present invention, and FIG. 3 is the present invention. It is a schematic block diagram for demonstrating the waste heat utilization equipment in a cogeneration apparatus.

  First, an outline of a cogeneration apparatus including waste heat utilization equipment will be described with reference to FIG. In FIG. 3, reference numeral 11 denotes a gas engine that drives the generator 12. The power generated by the generator 12 is the same as the voltage and frequency of the commercial system 17 that is an external power source by the grid interconnection inverter 13. They are aligned and sent to the power usage apparatus 47 in the home through the switchboard 15 by the feeder line 49. In addition, as described above, in such a cogeneration apparatus, since the efficiency is reduced when the engine is operated at a low output, the engine is operated at a rating of, for example, 1 kW during operation, and noise is suppressed. Tuned to minimize vibration during rated operation.

  Further, a current sensor 16 is provided between the commercial system 17 and the switchboard 15, and the current of the power sent from the commercial system 17 through the switchboard 15 to the power usage device 47 is measured and provided in the inverter 13. Sent to the controller. And the control apparatus in the inverter 13 reduces the electric power which the electric power usage apparatus 47 uses, and the electric current sent to the electric power usage apparatus 47 through the switchboard 15 from the commercial system 17 becomes small, ie, the generator 12 generated electric power. When there is surplus power, the surplus power consuming heater 22 is energized to prevent reverse power flow to the commercial system 17.

  On the other hand, the engine 11 is provided with a cooling water pipe 48 for utilizing the exhaust heat. Further, heat is given to the cooling water in the cooling water pipe 48 also from the exhaust heat exchanger 40, and the surplus electric power is consumed. Heat is also given to the cooling water by the heater 22. The heated cooling water warms the water stored in the hot water storage tank 42 by the heat exchangers 41, 43, and the water supplied to a heating terminal for indoor heating provided in the home (not shown). Similarly, 44 and 45 are heat exchangers for supplying hot water to the home, and 46 is an auxiliary heat source device that uses a gas or the like as a heat source when the heat source is insufficient.

  The above is the outline of the cogeneration apparatus. Next, the present invention will be described in detail with reference to FIGS. 1 and FIG. 2, the same components as those in FIG. 3 described above are denoted by the same reference numerals. In the figure, 11 is an engine, 12 is a generator that can be used as an engine starter motor, 13 is an AC / DC inverter 18 that converts, for example, 300V, 213 Hz alternating current generated by the generator 12 into about 300V direct current, This inverter board is equipped with a DC / AC inverter 19 for making this direct current 300V into the same alternating current as the voltage and frequency in the commercial system 17 as an external power source. By these engine 11, generator 12, inverter board 13, and ECU board 14, An engine unit 10 is configured.

Since the frequency and voltage of the commercial power system 17 that is an external power source are unlikely to fluctuate, the frequency and voltage of the power generated by the generator 12 is likely to fluctuate depending on the usage state of the power. by the 18 and DC / AC inverter 19, the generator 12 and the voltage and frequency of the electricity generated by an external power source serving as the grid 17 as aligned et been Ru be the same as in. The AC / DC inverter 18 and the DC / AC inverter 19 convert the alternating current from the commercial system into a direct current with the DC / AC inverter 19 and convert the direct current into the alternating current with the AC / DC inverter 18 when there is no power failure. A bidirectional AC / DC inverter and a DC / AC inverter that motor the generator 12 that can be used as an engine starting motor and start the engine 11.

  Reference numeral 14 denotes an ECU board that controls the engine 11 by mounting a CPU 29 that performs electronic control of the throttle, gas solenoid valve, ignition device, and various sensors of the engine 11, and 20 is mounted on the inverter board 13. A control power supply 21 that supplies power is controlled by the AC / DC inverter 18 and the DC / AC inverter 19, and the power consumption of the surplus power consumption heater 22 provided outside the inverter board 13 is controlled by PWM (Pulse Width Modulation). A CPU 26 that sends an instruction to the semiconductor switch 23 that controls the duty ratio by means of, for example, a breaker that is configured by a relay or the like and that can be controlled by the CPU 21. The surplus power consumption heater 22 is also used to warm the cooling water for hot water supply with surplus power, as described with reference to FIG.

  Normally, in such a cogeneration device, if electricity flows through the commercial system 17 during a power failure, it will hinder the maintenance of the electrical system. Is one of them, and the other is a DC / AC inverter 19 serving as a gate block instead of a breaker. Reference numeral 15 is a switchboard for supplying the outputs of the commercial system 17 and the DC / AC inverter 19 to household electric power use devices, and 16 is a current sensor composed of, for example, a CT (Current Transformer). The result is sent to the CPU 29 of the inverter board 13.

  In addition, 30 drives a generator 12 that can be used as a starter motor in the event of a power failure, supplies power for starting the engine 11, and uses the power generated by the generator 12 via a power distribution panel 32 during a power failure. 47 is a power failure start / power supply unit, 31 is a power failure panel for instructing hot water supply or power supply at the time of a power failure, 311 is a hot water switch, 312 is a power generation switch, 313 is a stop switch, 314 is a display of power consumption, etc. The devices 315, 316, 317, and 318 are indicator lamps for indicating the charging state and the stale state of the battery 36 in the start-up / feeding unit 30 at the time of a power failure. For example, 315 is blue indicating that the battery 36 is sufficiently charged. Indicator light, 316 is a yellow indicator light indicating that the power is decreasing, and 317 is a red indicator indicating a state where there is almost no power and the battery must be charged , 318 is a display lamp indicating that the exchange is necessary battery is gone I calyx.

  32 is a power distribution board for power supply in case of a power failure, and is connected to the power use device 47 as shown in FIG. 2 and used to drive a cooling water circulation pump of the exhaust heat utilization device. . 33 is a CPU 31 for controlling a power failure panel 31, a bidirectional DC / DC inverter 34, a DC / AC inverter 35, a power integrating sensor 38, a power failure breaker 37, etc. in a power failure unit 30. The low-voltage battery 38 starts the engine 11 from the battery 36, and therefore when the motoring current of the generator 12 is passed or the surplus power generated by the generator 12 is passed through the bidirectional DC / DC inverter 34. When the battery 36 is charged, the respective currents are measured and integrated, and the current integration sensor 39 for predicting the life of the battery 36 by the CPU 33 is a hot water supply unit as described with reference to FIG. 27 in FIG. 1 is an option for power failure that integrates the start / power supply unit 30 and the power failure panel 31 in the event of a power failure. , 28 waste heat utilization and power generation during non-power failure, is a non-power failure panel for instructing them to stop.

  In the cogeneration apparatus configured as described above, as described above, the engine unit 10 including the engine 11, the generator 12, the inverter board 13, and the ECU board 14, and the exhaust heat exchanger 42 shown in FIG. The hot water supply unit indicated by 39 in FIG. 2 including the hot water supply tank shown in FIG. 2 is generally installed outside the cooking area, and the blackout option 27 including the non-power failure panel 28 and the power failure panel 31 is a normal home. Installed inside.

  In the cogeneration apparatus shown in FIGS. 1 and 2, when there is no power failure, the hot water supply or power supply switch provided on the non-power failure panel 28 shown in FIG. The breaker 26 (see FIG. 1) is closed, and the alternating current sent from the commercial system 17 via the switchboard 15 and the breaker 26 is converted into direct current by the DC / AC inverter 19 and then converted into alternating current by the AC / DC inverter 18. Then, the engine 11 is started by motoring the generator 12 that can be used as an engine starting motor.

  At that time, the CPU 29 mounted on the ECU board 14 (see FIG. 1) electronically controls the throttle, gas solenoid valve, ignition device, various sensors, and the like of the engine 11. Then, for example, 300 V and 213 Hz alternating current generated by driving the generator 12 is converted to about 300 V direct current by the AC / DC inverter 18 included in the inverter board 13, and then the DC / AC inverter 19 performs external power supply. It is converted into AC100V / 200V three-phase alternating current having the same frequency as that of the commercial system 17, and is supplied from the breaker 26 to the power usage device in the home via the switchboard 15.

  A current sensor 16 is provided between the commercial system 17 serving as an external power source and the switchboard 15 to detect power used by the commercial system 17. Since the output of the generator 12 is constant, for example, 1 KW as described above, if the power used by the power usage apparatus in the home exceeds 1 KW, power is supplied from the commercial system 17 via the switchboard 15.

  On the other hand, if the power consumption of the power usage device in the home is less than 1 KW, the surplus electricity flows backward to the commercial system 17 as it is. In order to prevent this, the measurement result of the current sensor 16 provided between the commercial system 17 and the switchboard 15 is always sent to the control CPU 21 mounted on the inverter board 13, and the CPU 21 sends the measurement result based on this measurement result. In addition, when a decrease in the current flowing from the commercial system 17 toward the switchboard 15 is detected, a power corresponding to the surplus power is supplied to the semiconductor switch 23 that controls the power used by the surplus power consumption heater 22 because a reverse power flow may occur. Send PWM control signal to consume.

  The semiconductor switch 23 is composed of, for example, a transistor, and by inputting a PWM signal having a duty ratio for consuming surplus power to the base, power corresponding to the surplus power is generated by the surplus power consumption heater 22 according to the transmitted signal. It is consumed and the reverse power flow to the commercial system 17 is prevented.

  On the other hand, the exhaust heat of the engine 11 warms the cooling water passing through the exhaust heat exchanger 40 (see FIG. 2 and FIG. 3) composed of pipes wound around a radiator and the like, and further generates surplus power. If it is, it is heated by the heater 22 that consumes the surplus power. When a hot water supply or power supply stop signal is sent, the breaker 26 is opened, and the engine 11 is stopped by the ECU board 14 to stop hot water supply and power supply.

  Then, due to a power failure, the breaker 26 opens and the DC / AC inverter 19 stops operating and functions as a gate block. The commercial system 17 is disconnected and power feeding is stopped. For example, the gas driving the gas engine 11 is stopped. When the hot water supply switch 311 or the power generation switch 312 of the panel 31 at the time of power failure shown in FIGS. 1 and 2 is pressed, a signal is sent to the CPU 33, and for example, 12V of the battery 36 is reduced to 300 V by the DC / DC inverter 34. The engine 11 is started up after being boosted nearby and converted into alternating current for motoring the generator 12 by the AC / DC inverter 18. Of course, the battery 36 is not limited to 12V.

  When the generator 12 is driven by starting the engine 11, for example, 300 V and 213 Hz AC generated is about 300 V DC by the AC / DC inverter 18 included in the inverter board 13 as in the case of a non-power failure. Since the operation of the DC / AC inverter 19 is stopped at the time of a power failure, the DC / AC inverter 35 included in the power supply unit 30 is set to the same frequency and voltage as the commercial system 17 at the time of a power failure. Power is supplied to the power usage device 47 shown in FIG. 2 and a cooling water circulation pump (not shown) via the breaker 37 and the power distribution board 32 at the time of power failure.

  At this time, when the power generated by the generator 12 is not used up by the power usage device 47, the PWM control signal is sent from the CPU 21 to the semiconductor switch 23 so that the power corresponding to the surplus power is consumed, as in the case of non-power failure. The surplus power consumption heater 22 consumes power corresponding to surplus power. As described above, the surplus power consumption heater 22 is used to warm the cooling water of the hot water supply equipment in FIGS. The cooling water is also warmed by the exhaust heat exchanger 40 that uses the exhaust heat of the engine 11, stored in the hot water storage tank 42, and sent to a domestic hot water supply facility, a heating facility, or the like for use.

  Further, for example, the current integrating sensor 38 provided in the 12V battery 36 is based on the current used when starting the engine 11 and the surplus power generated by the generator 12 via the bidirectional DC / DC inverter 34 thereafter. When charging, the respective currents are measured and integrated, and the signal is sent to the CPU 33 to predict the life of the battery 36. When the battery 36 is sufficiently charged according to the prediction result, the battery remaining amount is indicated. The blue indicator 315 provided in the LED is turned on when the power is low, the yellow indicator 316 is turned on when there is almost no power and the battery needs to be charged. If replacement is necessary, the replacement indicator lamp 318 is turned on to notify the user. In this way, the user can know that the amount of charge of the battery 36, the need for charging, or that the battery 36 must be replaced.

Thus, the start / power supply unit 30 at the time of a power failure is configured so as to be detachable between the AC / DC inverter 18 and the DC / AC inverter 19, for example, and integrated with the panel at the time of a power failure as shown in FIG. If a power failure during the option 27 as, if not be much use the hot water supply facilities and power supply facility in the event of a power failure is to buy only the cogeneration unit, excluding the power failure option 27, a power failure at the time options if necessary 27 can be purchased, so the cogeneration apparatus can be made inexpensive.

  According to the present invention, the cogeneration device can be used even at the time of a power failure, the consumption of the battery can be suppressed to a small level, and the price of the cogeneration device can be reduced when there is not much concern about the power failure. Can contribute.

It is the schematic block diagram which showed the engine unit which produces electric power in the cogeneration apparatus which becomes this invention, and the option at the time of a power failure. It is a schematic block diagram of the whole cogeneration apparatus of this invention. It is a schematic block diagram for demonstrating the hot water supply equipment in the cogeneration apparatus which becomes this invention. It is a block diagram of the conventional cogeneration apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine unit 11 Engine 12 Generator 13 Inverter board 14 ECU board 15 Distribution board 16 Current sensor 17 Commercial system 18 AC / DC inverter 19 DC / AC inverter 20 Control power supply 21 CPU
22 Excessive power consumption heater 23 Semiconductor switch 26 Breaker 27 Power failure option 28 Non-power failure panel 29 CPU
30 Power failure start / power supply unit 31 Power failure panel 311 Hot water switch 312 Power generation switch 313 Stop switch 314 Power indicator 315 Blue indicator 316 Yellow indicator 317 Red indicator 318 Replacement indicator 32 Power distribution panel 33 during power failure
34 DC / DC inverter 35 DC / AC inverter 36 12V battery 37 Breaker 38 during power failure Current integration sensor 39 Hot water supply unit

Claims (3)

A power generation unit connected to an external power source and a power usage device, the power generation unit being connected between the power generation means usable as the engine and the motor for starting the engine, and the power generation means and the external power source; The bidirectional AC / DC converting means for converting the output of the power generation means to DC, and the first DC / AC converting means for converting the converted DC into AC that can be linked to an external power source. In a cogeneration apparatus in which a battery is connected between the DC / DC converter and the first DC / AC converter via the bidirectional DC / DC converter,
The engine is started by an external power source supplied to the power generation means via the first DC / AC conversion means and the bidirectional AC / DC conversion means at the time of a power failure, and the bidirectional DC / DC conversion means Connected to the bidirectional AC / DC converting means side is a second DC / AC converting means for setting the bidirectional AC / DC converting means output to the voltage and frequency of the external power source, and both of the battery outputs at the time of power failure. Boosting with a direct current / direct current conversion means, motoring the power generation means via the bidirectional alternating current / direct current conversion means, and enabling the engine to start,
In addition to the distribution panel connected to the commercial system, a power failure distribution board that drives the cooling water circulation pump of the exhaust heat utilization device in the event of a power failure is provided, and a power failure unit is configured including the power distribution panel during the power failure. The DC / AC conversion means, the battery, and the bidirectional DC / DC conversion means are integrated with each other, and a panel having a switch for starting the engine in the event of a power failure is provided to constitute a removable option. Cogeneration equipment.   Surplus power consumption that is connected to the bidirectional AC / DC converting means side of the first DC / AC converting means and consumes the amount of power generated by the power generating means that exceeds the amount of power used by the power using device. The cogeneration apparatus according to claim 1, further comprising: a heater as a heating unit of the exhaust heat utilization apparatus in the cogeneration apparatus.   The bidirectional DC / DC converting means has a step-down function for charging the battery with surplus power of the power generation means, and the battery is a current sensor for integrating and measuring the power consumed by the motoring of the power generation means and the charging current. The cogeneration apparatus according to claim 2, further comprising a control unit provided on the option side for predicting a battery life and displaying on the display device.

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