JP2014023412A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate driving of a high-voltage load with generated power of a storage battery.SOLUTION: The power supply system is configured so that generated power of a solar battery 11 and supply power from a commercial power supply 12 are stored in a storage battery 13, a motor 14 is driven with charged power stored in the storage battery 13 as a power supply, and so that a generator 16 is connected with the motor 14 through a transmission 15 to fetch a high voltage corresponding to a gear ratio of the transmission from the generator 16 for supplying to a load.

Description

  The present invention relates to a power supply system that supplies high-voltage power to a load by using generated power of a solar battery stored in a storage battery and power supplied from a commercial power source.

  Conventionally, the amount of commercial power from the commercial power supply is reduced by using the power generated by the solar battery, and when the commercial power supply is stopped, the battery is continuously stored until immediately before the commercial power supply is stopped. There has been widely proposed a power supply system that can supply power to a load (for example, see Patent Document 1).

JP-A-10-285825

  However, the storage battery used in the conventional power supply system generally has a capacity corresponding to the scale of the power supply system including the solar battery, and the output power and output voltage emitted by one storage battery have their own limits. . For this reason, for example, there is a disadvantage that it is not possible to cope with power supply to a load that requires high voltage operation. In addition, in order to obtain the required sufficiently high output voltage and output power, it is necessary to increase the number of installed storage batteries, that is, the number of connected storage batteries to be operated at the same time. . Furthermore, the increase in the number of installed storage batteries has the disadvantage that it may be difficult to secure these installation spaces.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to operate the generator at high speed using the generated power of the solar cell stored in the storage battery and the power supplied from the commercial power source. An object of the present invention is to provide a power supply system that can sufficiently operate a high voltage load that cannot be operated by using only the output power of the storage battery.

  In order to achieve the above-described object, a power supply system according to the present invention includes a storage battery that stores power generated by a solar battery and power supplied from a commercial power supply, and a motor that is driven using the charging power stored in the storage battery as a power source. And a generator connected to the motor via a transmission, and the rotation of the motor is converted to a speed corresponding to the gear ratio of the transmission and transmitted to the generator, and the generated power of the generator Is supplied to the load.

  According to this configuration, the motor is driven using the generated power of the solar battery stored in the storage battery during sunshine and the supplied power stored in the storage battery from the commercial power source at night, etc., and the rotation of the motor is converted to high speed rotation by the transmission. By transmitting this to the generator, a high voltage corresponding to the number of revolutions is induced in the generator, and operation of a high voltage load is enabled by the induced high voltage output.

  According to the present invention, since the generator can be operated at high speed based on the output power of the storage battery storing the generated power of the solar battery and the supply power of the commercial power supply, the high voltage induced by the generator is supplied to the high voltage load. This makes it possible to easily operate this high voltage load.

  The present invention has been briefly described above. Furthermore, the best mode for carrying out the invention described below will be described in detail with reference to the accompanying drawings.

1 is a block diagram conceptually showing a power feeding system according to an embodiment of the present invention. It is a block diagram which shows the specific example of the electric power feeding system shown in FIG.

  Hereinafter, a power supply system according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  The power feeding system according to the present embodiment shown in FIG. 1 includes a solar battery 11, a commercial power source (commercial power system) 12, a storage battery 13, a motor 14, a transmission 15, and a generator 16. The Of these, the solar cell 11 directly converts solar light energy into electric power, and is now widely used as regenerative energy. A plurality of solar cells (cells) 11 are connected (connected) in series or in parallel so as to obtain a required level of voltage, and are modularized, and are further covered with tempered glass to form a solar cell panel. ing.

  The commercial power supply 12 is a power supply source from the power company to the power consumer. In Japan, two systems of 50 Hz and 60 Hz are used, and the supply voltage is AC 100 volts. The storage battery 13 is a battery that stores DC power, stores power generated by sunlight, wind power, and the like and supplies it to a load. Electric power obtained by using natural energy such as sunlight and wind power is generally unstable and is not always a constant value. However, once the unstable power is stored in the storage battery 13, the power smoothed and stabilized by the storage battery can be output. Moreover, the storage battery 13 can take out electric power anytime and anywhere, and is very useful especially as an emergency power source.

  The motor 14 is an AC motor, and the drive shaft of the generator 16 is linked to the output shaft of the motor 14 via the transmission 15. The transmission 15 is composed of a combination of a plurality of gears, converts the rotational speed of the motor 14 into a rotational speed corresponding to the gear ratio, and transmits it to the generator 16. As the transmission 15 used here, one having a configuration in which the gear ratio is adjustable or not adjustable can be arbitrarily selected and used. In this embodiment, when the gear ratio of the transmission 15 is, for example, 10 to 1, the rotational speed of the generator 16 can be rotated 10 times faster (high speed rotation) than the rotational speed of the motor 14. it can. Therefore, the generator 16 generates a high voltage corresponding to the rotational speed.

  FIG. 2 shows details of the power feeding system shown in FIG. 1, and the solar cell 11 is connected to an inverter 18 via a distributor 17. The inverter 18 is connected to the commercial power supply 12 via a distribution board 19. Among these, the distributor 17 supplies the generated power of the solar battery 11 to the inverter 18 and also supplies it to the charging circuit of the storage battery 13.

  The inverter 18 converts the DC power input through the distributor 17 into AC power having a commercial frequency. The distribution board 19 functions to superimpose AC power obtained by the inverter 18 and AC power obtained by AC conversion of the discharge power of the storage battery 13 by an inverter 25 described later on the commercial power from the commercial power source (commercial power system) 12. To do.

  A charger 20 is connected to the distributor 17 via a switch 21, and the storage battery 13 is connected to the charger 20. When the switch 21 is closed, the charger 20 functions to supply the generated power of the solar cell 11 to the storage battery 13 through the distributor 17 and charge it.

  A rectifier 23 is connected to an AC line 24 connecting the inverter 18 and the distribution board 19 via a switch 22, and the rectifier 23 is further connected to a charger 20. The rectifier 23 rectifies the AC output power of the inverter 18 and the AC power from the commercial power source when the switch 22 is closed. The charger 20 can store the DC output power by the rectification in the storage battery 13. Yes.

  Further, an inverter 25 is connected to the storage battery 13, and the inverter 25 is connected to the AC line 24 via a switch 26. As a result, when the switch 26 is closed, the power stored in the storage battery 13 as described above is discharged and input to the inverter 25. The inverter 25 converts the discharged power into AC and converts the AC converted power into power. Supply to the AC line 24 is enabled.

  A motor (AC motor) 14 is connected to the AC line 24, and an input shaft of the transmission 15 is connected to an output shaft of the motor 14. A drive shaft of a generator (alternator or dc generator) 16 is connected to the output shaft of the transmission 15. Thereby, the rotation of the motor 14 is increased according to a predetermined gear ratio of the transmission 15, and the generator 16 is operated at a predetermined rotation speed higher than the rotation speed of the motor 14. Therefore, the generator 16 outputs a high level voltage corresponding to the speed.

  In the power feeding system having such a configuration, the generated power of the solar cell 11 is input to the inverter 18 through the distributor 17 during sunlight, and the AC power converted by the inverter 18 is combined with the AC power from the commercial power supply 12 through the AC line 24. To the motor 14. In this case, when the switch 21 is closed, the generated power of the solar cell 11 is supplied to the charger 20 via the distributor 17, and the charger 20 supplies the distributed power (DC power) to the capacitor 13. Allow to store electricity.

  On the other hand, AC power from the commercial power source 12 is supplied to the distribution board 19 and the AC line 24 regardless of whether it is daytime or nighttime. Here, when the switch 22 is closed, the AC power on the AC line 24 is input to the rectifier 23 and converted into DC power, and the charger 20 stores the DC power in the storage battery 13. Therefore, the storage battery 13 stores not only the power generated by the solar battery 11 but also AC power from the commercial power source 12. When the switch 21 is opened, only the AC power from the commercial power source 12 is stored in the storage battery 13.

  Even during the charging operation of the storage battery 13, the motor 14 rotates by receiving AC power through the AC line 24, and this rotation is transmitted to the generator 16 through the transmission 15. Therefore, the generator 16 is operated at a speed corresponding to a predetermined gear ratio set in the transmission 15, and generates a predetermined level of AC power or DC power according to the operating speed.

  Further, when the surroundings are dark, for example, at night, when the solar cell 11 does not generate power, or when power supply from the commercial power supply 12 is interrupted (when a power failure occurs), the AC voltage power on the AC line 24 The level drops to zero. Therefore, the drive power of the motor 14 cannot be obtained, and the generator 16 cannot be driven by the motor 14. In this case, the switch 26 is closed while the switches 21 and 22 are opened. As a result, the storage battery 13 starts discharging to the inverter 25, and the inverter 25 converts the DC power released by the storage battery 13 into AC power that matches the frequency and phase of the commercial power supply 12 and supplies the AC power to the AC line 24. Therefore, the motor 14 connected to the AC line 24 is driven, and the driving torque of the motor 14 is transmitted to the transmission 15.

  The gear ratio of the transmission 15 can be arbitrarily set, and is set to a sufficiently large value as compared with a normal gear ratio. For this reason, the generator 16 rotates at a speed sufficiently higher than the rotational speed of the motor 14 according to the gear ratio. As a result, the generator 16 is in a high voltage output state and can operate with a high voltage load. That is, various high voltage loads can be operated using only the discharge power of the battery 13 as a power source.

  When the transmission 15 itself does not have the gear ratio setting means as described above, the motor 14 and the generator 16 are directly linked so as to bypass the transmission 15 as shown by a chain line in FIG. Can be made. Thereby, when AC power is normally obtained from the generated power of the solar battery 11 and the commercial power supply 12, the generator 16 can be directly operated by the motor 14 using the AC power.

  As described above, the power supply system according to the present embodiment stores the power generated by the solar battery 11 and the power supplied from the commercial power supply 12 in the storage battery 13 and drives the motor 14 using the charging power stored in the storage battery 13 as a power source. In addition, a generator 16 is connected to the motor 14 via a transmission 15 so that a high voltage corresponding to the gear ratio of the transmission 15 can be extracted from the generator 16 and supplied to a load.

  Therefore, according to this configuration, the motor 14 is driven using the generated power of the solar battery 11 stored in the storage battery 13 during sunshine and the supply power stored in the storage battery 13 from the commercial power supply 12 at night or the like. By transmitting the rotation to the generator 16 via the transmission 15, the generator 16 can be operated at an arbitrary high speed according to the gear ratio of the transmission 15. Therefore, the generator 16 can output a high voltage at a level corresponding to the high-speed rotation, and thus the operation of a high voltage load can be easily realized by the high voltage output.

11 Solar power 12 Commercial power (system)
DESCRIPTION OF SYMBOLS 13 Storage battery 14 Motor 15 Transmission 16 Generator 17 Distributor 18, 25 Inverter 19 Distribution board 20 Charger 21, 22, 26, 28 Switch 23 Rectifier 24 AC line 27 Bypass line

Claims (1)

A storage battery for storing the generated power of the solar battery and the power supplied from the commercial power supply;
A motor driven by using the charging power stored in the storage battery as a power source;
A generator coupled to the motor via a transmission,
The rotation of the motor is converted to a speed according to the gear ratio of the transmission and transmitted to the generator,
A power supply system that supplies power generated by the generator to a load.

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