JP3223682U - AC power generation unit - Google Patents

Abstract

[PROBLEMS] To replace a capacitor built in a converter with a battery and attach it externally so that the converter and inverter are shared between the DC generator and the AC generator, thereby reducing manufacturing costs and occupying a small area. A hybrid concept AC power generation unit is provided. SOLUTION: An AC power generator 22 or a DC power generator 24, a power unit 30 comprising a converter 26 for converting AC to DC and a battery 28 charged with DC from the converter, and a DC connected to the battery for direct current from the battery. The inverter 32 for converting to alternating current, the alternating current from the alternating current generator is converted into direct current by the converter and charged to the battery, the direct current from the direct current generator is charged to the battery, and the direct current from the battery is alternating current by the inverter. And is supplied to the power supply load 18. [Selection] Figure 1

Description

  This device replaces a capacitor that smoothes the pulsating flow built in a converter that converts alternating current into direct current, for example, by selectively replacing alternating current from an AC generator driven by an engine or direct current from a solar panel. The present invention relates to an AC power generation unit that converts and outputs AC from an inverter connected to the converter.

  Portable and stationary engine generators are widely used in consumer and industrial fields. This engine generator generates AC by rotating the AC generator with the engine, but the AC frequency (Hz) obtained is severely turbulent and requires a stable frequency such as a personal computer or servo motor. It is inappropriate as a power source for the power supply load. For this reason, recent engine generators can supply alternating current converted into a stable frequency by using a converter and an inverter together.

  FIG. 2 shows an outline of a so-called inverter generator. The engine (internal combustion engine) 10 rotates an alternator 12 to generate alternating current (AC), and this alternating current (AC) is input to the converter 14. . The converter 14 converts alternating current (AC) into direct current (DC), and supplies the obtained direct current (DC) to the inverter 16 at the subsequent stage. The inverter 16 converts direct current (DC) into alternating current (AC), and the obtained alternating current (AC) is supplied to various power supply loads 18. Since the inverter 16 can convert direct current into alternating current and can also convert the power supply frequency, alternating current with a stable frequency is supplied to the power supply load 18.

Utility Model Registration No. 3219331

  The conventional inverter generator shown in FIG. 2 is an example in which a converter 14 and an inverter 16 are connected to an AC generator 12 driven by the engine 10 to obtain an alternating current with a good power supply frequency. By the way, the diversification of power supply has recently been advanced, and many power generation systems using natural energy have been put into practical use as supplements to conventional hydroelectric power generation, thermal power generation and other nuclear power generation.

  Examples of the power generation system using natural energy include solar power generation using solar panels, wind power generation, geothermal power generation, tidal power generation, and other fuel power generation. Here, since solar power generation and fuel power generation generate direct current as they are, an AC conversion unit (power conditioner) that adjusts to the required voltage and frequency is required for actual consumer and commercial use. Needed. In wind power generation, if a DC generator is used as a generator connected to a blade that is rotated by wind power, DC is directly generated. On the other hand, if an AC generator (synchronous generator or induction generator) is adopted as a generator such as wind power generation, geothermal power generation or other tidal power generation, AC is directly generated.

  The present invention relates to an AC power generation unit that can use these methods in a combined or selective manner, whether it is a method of generating direct current or a method of generating alternating current. Therefore, in the detailed description of the present invention, a system that generates direct current, such as solar power generation, is referred to as a “direct current generator”, and a system that generates alternating current, such as an engine generator, is referred to as an “alternating current generator”.

  If there is an AC power generation unit that hybridizes a DC power generator that uses natural energy as a source of energy, such as the aforementioned solar power generation or wind power generation, with a conventional AC power generator (for example, an inverter generator), solar power generation It is convenient because it can complement each other's natural energy and mechanical energy such as engines, but it does not yet exist in the market. In this hybrid AC power generation unit, the converter 14 and the inverter 16 described above are required in order to obtain a high-quality AC with a stable frequency regardless of which power generator (DC / AC) is used. And

  Therefore, in order to realize the AC power generation unit according to the hybrid concept, it is necessary to separately provide a converter and an inverter for each of the DC power generation body and the AC power generation body. However, the separate use of the converter and inverter for the DC generator and the AC generator has the disadvantages that the essential components are duplicated, resulting in a large cost loss and an increase in the overall configuration of the unit. .

In order to overcome the above-mentioned problems and achieve the intended purpose, the device according to claim 1,
AC generator or DC generator,
A power unit comprising a converter for converting alternating current to direct current and a battery to which direct current from the converter is charged;
An inverter connected to the battery and converting direct current from the battery into alternating current;
AC from the AC generator is converted to DC by the converter and charged to the battery,
Direct current from the direct current generator is charged to the battery,
The gist of the invention is that the direct current from the battery is converted into alternating current by the inverter and supplied to the power supply load.
According to the first aspect of the invention, the converter and the inverter can be shared by both the DC power generator and the AC power generator by replacing the capacitor of the converter with a battery and externally attaching it. For this reason, it is possible to simplify the manufacturing cost and the occupation area.

  By replacing the capacitor built in the converter with a battery and attaching it externally, the converter and inverter can be shared between the DC generator and the AC generator, thus reducing the manufacturing cost and the occupied area. It became possible to simplify.

It is a block diagram which shows schematic structure of the alternating current power generation unit which concerns on this invention. It is a block diagram which shows schematic structure of the conventional inverter generator.

  Next, a preferred embodiment of the AC power generation unit according to the present invention will be described with reference to the accompanying drawings. Examples of the forms of natural energy used in the embodiments of the present invention include (1) the case of using a direct current power source that directly outputs direct current by converting sunlight with a solar panel, and (2) wind power generation. Such a case is roughly classified into a case of using an AC power source that generates a rotational force by natural energy and outputs an alternating current, such as hydroelectric power generation and geothermal power generation. In general, large-scale power generation facilities are recalled in terms of feng hydro power generation and geothermal power generation, but here, small-scale usage forms are assumed. Taking hydroelectric power generation as an example, water turbines are installed in small drainage channels such as gutters and valley rivers, and small-scale power generation is carried out locally by rotating these water turbines. In addition, wind power generation is not a large-scale device that rotates a windmill in a tower built in a strong wind region, but highly efficient small-scale wind power generation devices that can be installed in private homes and public facilities have become widespread. Further, even in the case of geothermal power generation, small-scale geothermal power generation is possible by rotating a small steam turbine if thermal steam is constantly ejected from the ground surface in hot springs or volcanic areas. For example, in wind power generation, if a DC generator is adopted as a generator rotated by a blade, it becomes a “DC generator”, and if an AC generator is adopted, it becomes an “AC generator”. That's right.

  The AC power generation unit 20 shown in the block of FIG. 1 shows an example in which an AC power generator is adopted as a wind power generator, and this wind power generator is an AC power generator 22. However, when a DC generator is adopted as the wind power generator, the DC generator 24 shown in FIG. 1 is obtained. A representative example of the DC power generator 24 is a solar panel (solar module) used for solar power generation.

  An AC power generation unit 20 in FIG. 1 includes an AC power generator 22 formed of an AC generator such as an engine generator and / or a DC power generator 24 formed of a DC power generation module such as a solar panel, and a converter that converts alternating current into direct current. (AC / DC) 26 and a power unit 30 composed of a battery 28 charged with direct current from the converter 26, and an inverter 32 for converting direct current from the battery 28 in the power unit 30 into alternating current. .

  The converter 26 in the power unit 30 has the same basic function as that of the converter 14 shown in FIG. 2 for converting alternating current (AC) into direct current (DC). However, the converter 26 differs in that it uses a battery 28 instead of a capacitor. That is, a converter generally has a rectifier such as a thyristor or a triac, and converts alternating current (AC) from an alternating current generator into direct current (DC). The obtained direct current (DC) has many pulsating flow components, so-called `` “Half-wave rectification”. Therefore, the converted direct current (DC) is smoothed by an electrolytic capacitor (capacitor), and the pulsating flow component is smoothed and output as a stable direct current.

  However, in an embodiment of the present invention, a battery (storage battery) 28 is provided separately from the converter 26 in place of the electrolytic capacitor (capacitor) so that the direct current from the direct current generator 24 and / or the direct current from the converter 26 ( Both are in a pulsating state) so that the battery 28 is charged. The direct current (DC) in the pulsating state is smoothed by charging the battery 28 and becomes a good direct current. That is, instead of the DC smoothing electrolytic capacitor (capacitor) originally provided in the converter, the power unit 30 can be configured by the battery 28 and the converter 26 by providing the battery 28 separately. As a result, the manufacturing cost of the AC power generation unit 20 can be reduced, and a simple hybrid power generation unit as a whole can be realized.

  The inverter 32 shown in FIG. 1 is basically the same as the inverter 16 shown in FIG. 2, and includes a self-extinguishing switching element such as an IGBT (insulated gate bipolar transistor) or a power MOSFET. That is, the input direct current (DC) is converted into alternating current (AC) by driving the gate to perform direct current turn-off and turn-on.

  According to the AC power generation unit according to the above-described embodiment, for example, when using the AC power generator 22 that uses an AC power generator for wind power generation, the converter 26 converts the alternating current (AC) from the AC power generator 22 into direct current. The direct current (DC) obtained by converting into (DC) is charged in the battery 28. The direct current (DC) has a pulsating flow component, but the direct current (DC) supplied to the inverter 32 after being stored in the battery 28 has the pulsating flow component removed. The inverter 32 converts direct current (DC) into alternating current (AC) and adjusts the frequency to supply high-quality alternating current (AC) to various power supply loads 18.

  For example, when solar power generation using a solar panel is used for the DC power generator 24, the direct current (DC) from the battery 28 is charged to the inverter 32 after charging the direct current from the DC power generator 24 to the battery 28. The inverter 32 converts direct current (DC) into alternating current (AC), and supplies the converted alternating current to the power supply load 18.

  As described above, according to the present invention, when the AC power generator 22 is used, it is not necessary to use an electrolytic capacitor (capacitor) for the converter 26, and the pulsating flow component is removed by smoothing by the battery 28 provided as an alternative. it can. Further, when the DC power generator 24 is used, the battery 28 only needs to be charged. The power unit 30 can be configured compactly by the converter 26 and the battery 28, and the housing can be downsized.

18 power supply load, 22 AC generator, 24 DC generator, 26 converter,
28 batteries, 30 power units, 32 inverters

Claims (1)

AC generator (22) or DC generator (24),
A power unit (30) comprising a converter (26) for converting alternating current to direct current and a battery (28) to which direct current from the converter (26) is charged;
An inverter (32) connected to the battery (28) for converting direct current from the battery (28) into alternating current;
AC from the AC generator (22) is converted to DC by the converter (26) and charged to the battery (28),
Direct current from the direct current generator (24) is charged to the battery (28),
The AC power generation unit is characterized in that a direct current from the battery (28) is converted into an alternating current by the inverter (32) and supplied to the feeding load (18).

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