KR20020080614A - An apparatus and method for generating combined sources - Google Patents

Abstract

PURPOSE: A supply apparatus and a method for generating combined sources are provided to reduce the fuel cost and the environmental pollution by generating electrical power through an alternative energy source, such as the lights of sun and wind power. CONSTITUTION: A power controlling unit outputs a generated power using natural energy and converts an AC(Alternating Current) power generated from a diesel generator into a DC(Direct Current) power to output it. A storing unit(84) stores the DC power outputted from the power controlling unit. An inverter(64) controls an additional power supply through the diesel generator according to the DC power outputted from the power controlling unit. An automatic switching unit(66) supplies the power generated through the natural energy to a load via the inverter(64). The automatic switching unit(66) further supplies the additional power to the load.

Description

An apparatus and method for generating combined sources}

The present invention relates to a power supply device and method for a composite power generation, and more particularly, a combination of solar power generating electricity using solar light and wind power generating electricity by the power of wind at the same time with the same DC output. The present invention relates to a device and a method for supplying a combined power source for supplying power to a consumer.

The biggest problem of the conventional energy use is greenhouse gas emission, and the greenhouse gas emission is greatly increased. At this time, interest in power generation using alternative energy such as wind and solar power is increasing, and research and development are in progress.

Wind and photovoltaic power generation has unlimited resources, no fuel cost, and has eco-friendly cleanliness, which is not only high in value, but also easy to install due to the high cost burden and the technical power of commercial systems. It has been put into practical use as a distributed power source for supplying power to customers located where it is difficult to supply.

However, when generating power using only wind or solar power, there is a problem in stable power supply due to the variation in power generation output due to wind speed or solar radiation, and especially, it may have a fatal effect on customers equipped with equipment that should be operated continuously even in case of power failure. .

In order to overcome the weather dependence of the alternative energy power output, there is a method of linking the wind power generator or the solar power generator with the commercial system, but it is difficult to apply it in the region where it is difficult to supply the electric power by the commercial system. .

At present, remote islands or mountain walls are mostly supplied with diesel generators, and there is a problem that stable electricity supply is difficult to replace with alternative energy sources such as wind power and solar power.

1 is a configuration diagram of a conventional photovoltaic power generation facility, and receives direct sunlight from the solar cell array 10 to generate DC power, and the generated DC power is converted into AC while passing through the DC / AC converter 21. do. Some of the converted AC power is supplied directly to the load, and some are supplied to the power system in synchronization with the existing system. This overall operation algorithm is built in the control unit 22, and the control unit 22 performs adjustment and operation. The controller 20 includes a protection unit 23 that prevents a fault current from entering the solar power plant due to a fault such as a short circuit in the controller 20 itself or a fault such as a ground fault or a short circuit from the outside.

2 is a configuration diagram of a conventional wind power generation facility, after alternating the AC power generated in the system (SG) 40 and the system directly sending the AC power generated in the generator (SG) 40 to the existing system after There are two forms of converting it back into alternating current and sending it to the system. In the former case, the structure of the system is simple, but if the wind is not blown or blown, the adverse effects such as the frequency voltage to the system due to the output fluctuation can be greatly affected. In the latter case, the configuration of the system is complicated, but it has the advantage of being able to cope with the fluctuation of the input as in the case of the former. 2 is a system corresponding to the latter, when the blade 30 is turned by the force of the wind generator 40 and the blade 30 is connected to the AC power is generated, the AC power at this time AC / DC converter ( 51) is converted into a constant DC power, and the constant DC power is converted back to an AC in the DC / AC converter 52, and some are directly supplied to the load, and some are synchronized with the existing system, and then power is supplied to the system. It is a system. In FIG. 2, the control unit 53 and the protection unit 54 perform the same functions as the control unit 22 and the protection unit 23 of FIG. 1.

Conventional photovoltaic power generation is a power generation method having a battery that stores electric energy for use at night by generating power during the day using sunlight in the absence of commercial power in remote islands or remote areas.

The prior art in this method is Japanese Patent Application Laid-open No. 6-133462 filed in Japan on October 19, 1992 (name: grid linkage system), but this is only a grid-connected type where a commercial power source is connected. It was a system.

In addition, Korean Patent Application No. 10-1996-0038913 also relates to grid-connected photovoltaic power generation, which should continue to operate even when the power supply to the load is interrupted due to continuous power failure or unexpected power failure. When a device such as a fan or a refrigerator is used as a load, the power generated by the solar cell is continuously supplied to the load so that the electric device that can be used even with a capacity lower than the amount of generated solar power is operated. It is a grid-connected photovoltaic device that makes maximum use of power generation.

In addition, domestic patent application No. 10-1999-0021416 also relates to a road light, and by installing the windmill and solar cells on the road by using the electric energy generated from the wind energy and solar energy obtained by the lighting of the road at night It relates to road lights using wind and solar energy that clearly and reliably display the situation. According to the investigation and analysis of the contents proposed so far, a system that generates electricity and supplies power to a load by a system of solar or wind power. It was a form.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and provides a complex power supply device for smoothly supplying electric power generated by using natural energy to island areas and mountain areas where commercial power is not available. There is a purpose.

Another object of the present invention is to provide a method for supplying a composite power source to smoothly supply electric power generated by using natural energy to island areas and mountain areas where commercial power is not available.

1 is a configuration diagram of a conventional photovoltaic power generation facility,

2 is a configuration diagram of a conventional wind power generation facility,

3 is a configuration diagram of an apparatus for supplying a combined power source according to an embodiment of the present invention;

4 is a flowchart for explaining a method for supplying a combined power source according to an embodiment of the present invention.

※ Explanation of code for main part of drawing

10: solar cell array 20, 50: controller

21, 52: DC / AC converter 22, 53: control unit

23, 54: protection unit 30: blade

40: generator 51: AC / DC converter

60: wind generator 62: first power regulator

64: inverter 66: automatic transfer switch

70 solar cell 72 second power regulator

80: diesel generator 82: third power regulator

84: storage battery S1 to S8: switch

In order to achieve the above object, the apparatus for supplying a combined power generator according to a preferred embodiment of the present invention outputs power generated by using natural energy, and controls power output by converting AC power generated by a diesel generator into DC power. Way; Storage means for storing the DC power output from the power adjusting means; An inverter for controlling the additional power supply by the diesel generator according to whether the power supply to the load is satisfied by the generated power using natural energy among the power output from the power adjusting means; And an automatic transfer switching means capable of switching to a first transfer mode for supplying generated power using the natural energy to the load via the inverter and to a second transfer mode for supplying power to the load by the operation of the diesel generator. do.

In addition, the method for supplying a combined power source according to an embodiment of the present invention, the first process of storing the generated power using natural energy in the storage means; And a second process of supplying generated power using natural energy stored in the storage means to the load, comparing the amount of supply required by the load, and charging the storage means with additional power generation or surplus power generation accordingly.

Hereinafter, with reference to the accompanying drawings for the embodiment of the present invention will be described.

3 is a configuration diagram of a power supply device for a combined power generation system according to an embodiment of the present invention, in which a windmill is driven by the force of wind when the wind is blowing; A first power regulator 62 which converts the alternating current power generated by the wind generator 60 into a corresponding direct current power and stores the same in the power storage battery 84 and outputs the rear end; A solar cell 70 that receives the sunlight to generate direct current power when sun light is generated; A second power regulator 72 for storing the DC power generated in the solar cell 70 in the storage battery 84 and outputting it to the rear stage; An inverter (64) for converting DC power supplied from the first and second power regulators (62, 72) into alternating current and supplying power to the load while appropriately adjusting the load according to the load; When the wind power is insufficient and the solar light is insufficient, and the supply amount is insufficient for the load generated by using only natural energy, the diesel generator 80 is operated to partially load the alternating current output from the diesel generator 80. A third power regulator (82) for supplying power to the storage battery (84) by directly supplying the power to the direct current and converting a portion into direct current power; And a first switching mode for supplying the remaining power from solar light and wind power to the load via the inverter 64 and a second switching mode for supplying power to the load when the diesel generator 80 is operated. An automatic line transfer switch (ALTS) unit 66 is provided. In Fig. 3, reference numerals S1 to S8 are switches.

Here, the inverter 64 incorporates a microprocessor (not shown) having a predetermined operation (control) algorithm.

The inverter 64 senses the DC power value supplied from the first and second power regulators 62 and 72 and the power value stored in the storage battery 84, and based on the sensed DC power value, the solar light. Is it possible to supply power to the load with only the power by the wind and storage battery 84 or if the power by the solar and wind and storage battery 84 is not enough and additional power by the diesel generator 80 is necessary. Judge. The inverter 64 determines the first or second transfer mode of the automatic transfer switch unit 66 according to the determination.

That is, the inverter 64 supplies the generated power using the natural energy (wind power, solar light) to the load, and the automatic transfer switch if the generated power using the natural energy does not meet the supply amount required by the load. After controlling the unit 64 to the second switching mode, electric power by the diesel generator 80 is additionally supplied to the load.

On the other hand, the inverter 64 stores the excess power in the storage battery 84 and supplies the remaining power to the load when the generated power using the natural energy (wind power, sunlight) is greater than the load, the natural energy If the generated power is smaller than the load, the diesel generator 80 may not be operated, but the power stored in the storage battery 84 may be supplied to the load. In this case, since the life of the battery 84 is completely discharged, the life of the battery 84 rapidly decreases, so that the minimum voltage level V _MIN and the maximum voltage level V _MAX can be maintained by setting an appropriate minimum voltage level V _MIN . Adjust charge and discharge (power storage and supply) appropriately. Here, the appropriate voltage level varies slightly depending on how much voltage is supplied to the load. The minimum voltage level (V _MIN ) and the maximum voltage level (V _MAX ) of the storage battery 84 are determined depending on the degree of charge and discharge depth. The battery 84 in which the minimum voltage level V _MIN and the maximum voltage level V _MAX are set passes directly without charging any more when the power stored during charging reaches the maximum voltage level V _MAX .

In addition, the inverter 64 checks the voltage level V _B of the storage battery 84 when the generated electric power using the natural energy (wind power, solar light) is smaller than the load, and is equal to or lower than a predetermined voltage level V _MIN . In the rear, the electric power using the diesel generator 80 is additionally supplied without supplying power from the storage battery 84. In this case, when the diesel generator 80 is operated, a part of electric power using the diesel generator 80 is supplied to the load, and the rest is stored in the storage battery 84.

Next, the operation of the apparatus for supplying the combined power generation power according to the embodiment of the present invention will be described in detail with reference to the flowchart of FIG. 4.

First, as an initial condition, the switches S1, S2, S3, and S4 are in a closed state, and the switches S5, S6, S7, and S8 are in an open state, and the current automatic switching mode (ALTS). Mode) is assumed to be a first switching mode using electric power by wind and solar light, and it is assumed that the DC voltage V _B stored in the battery 84 is in a state of maximum V _MAX .

The AC power generated through the wind power generator 60 maintains a constant voltage level to allow power storage in the storage battery 84 through the first power regulator 62 and the DC voltage of the second power regulator 72. Adjust to match. In the second power regulator 72, since the direct current output generated by the solar cell 70 will be changed by solar energy, the variable direct current power is adjusted to a constant direct current power to allow power storage in the storage battery 84. This also needs to be appropriately adjusted to maintain the same voltage as the first power regulator 62 (steps S10 and S12).

The generated electric power generated by the solar light and the wind power is input to the inverter 64 through the first and second power regulators 62 and 72. The inverter 64 determines whether the generated electric power generated by the solar and wind power is larger than the load (steps S14 and S16).

As a result of the determination, when the generated power generated by the solar and wind power is larger than the load (“YES” in step S16), the inverter 64 corresponds to the supply amount required by the load through the automatic transfer switch unit 66. Supply power to the load.

In addition, the inverter 64 stores the excess power in the storage battery 84. When the current voltage level V _B of the storage battery 84 is equal to or less than the minimum voltage level V _MIN (in step S18), YES ") the switch S5 is closed to charge the storage battery 84 (step S20).

After a predetermined time has elapsed, the inverter 64 opens the switch S5 when the voltage level V _B of the battery 84 is equal to the maximum voltage level V _MAX (“YES” in step S22). The storage of power to the storage battery 84 is stopped. Of course, even at this time, the power generated by the solar and wind power is continuously provided to the load.

On the other hand, if the generated power generated by the solar and wind power in step S16 is smaller than the load, the process proceeds to step S26 to determine whether the current voltage level (V _B ) of the storage battery 84 is below the minimum voltage level (V _MIN ). To judge.

As a result of the determination in step S26, when the current voltage level V _B of the storage battery 84 is equal to or greater than the minimum voltage level V _MIN , the inverter 64 closes the switch S5, and the switch S1, S2, S3, and S4 are opened to supply the load stored in the storage battery 84 to the load (step S28).

After that, when the power generated by the solar and wind power is generated and sufficiently supplied to the load (“Yes” in step S30), the inverter 64 opens the switch S5 and the switches S1 and S2. , S3, S4 are closed to provide the load with power from the first and second power regulators 62, 72.

On the contrary, as a result of the determination in step S26, the diesel generator 80 is started when the current voltage level V _B of the storage battery 84 is equal to or less than the minimum voltage level V _MIN (step S34). In this case, the inverter 64 closes the switches S6, S7, and S8 (step S36). Then, the inverter 64 switches the automatic transfer switch unit 66 to the second transfer mode (step S38).

Accordingly, the alternating current power generated by the diesel generator 80 is supplied to the load through the automatic transfer switch unit 66, and the remaining power is supplied to the storage battery 84 through the third power regulator 82 to store the storage battery. 84 is charged (step S40).

When the voltage level V _B of the battery 84 to be charged is equal to the maximum voltage level V _MAX (“YES” in step S42), the inverter 64 opens the switches S6 and S7. (Step S44) When the output by the solar and wind power is generated and the supply amount to the load is sufficient ("YES" in step S46), the inverter 64 closes the switches S1, S2, S3, S4. And switch S8 is opened (step S48). In addition, the inverter 64 switches the automatic transfer mode of the automatic transfer switch unit 66 to a first transfer mode (ie, solar + wind power mode) (step S50).

Accordingly, the diesel generator 80 is stopped and power generated by the solar and wind power is supplied to the load.

Of course, if the amount of power generated by natural energy (solar, wind) is sufficient or insufficient to supply the load frequently, the power supply may be continuously changed. You can adjust the control algorithm.

As described in detail above, according to the present invention, two different outputs of a photovoltaic power generation system capable of generating power by solar light and a wind power generation system capable of generating power by wind power may be used by using a power regulator. Combined with one DC output to supply power to the place where it is needed, or to store the power in the storage battery when it is left, the power stored in the battery when the amount of power generated is less than the required amount due to lack of solar light or wind power. Can supply the load to the load, and if there is not enough power to supply it by supplying all the power stored in the battery, the diesel generator can be operated to charge some of the battery and some to power the required load. Part can be solved through alternative energy sources, This reduces the capacity of the diesel generator, thereby reducing fuel costs and improving environmental pollution.

The present invention contributes to global warming and environmental problems by providing power generated by using environmentally friendly natural energy of solar light and wind power in urban and mountain areas where commercial power is not available, and in remote islands and mountain walls. Can also contribute to the telephony business.

On the other hand, the present invention is not limited only to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, the technical idea to which such modifications and variations are also applied to the claims Must see

Claims (12)

Power control means for outputting generated power using natural energy and converting and outputting AC power generated in the diesel generator into DC power; Storage means for storing the DC power output from the power adjusting means; An inverter for controlling the additional power supply by the diesel generator according to whether the power supply to the load is satisfied by the generated power using natural energy among the power output from the power adjusting means; And And an automatic transfer switching means capable of switching to a first transfer mode for supplying generated power using the natural energy to the load via the inverter and to a second transfer mode for supplying power to the load by the operation of the diesel generator. Supply of the combined power generation, characterized in that. The method of claim 1, The power generation unit using the natural energy output from the power control means is a power supply using a combined power source, characterized in that consisting of power using the wind power and solar power. The method according to claim 1 or 2, The inverter supplies the generated power using the natural energy to the load, and when the generated power using the natural energy does not meet the supply amount required by the load, the inverter controls the automatic transfer switching means to supply power from the diesel generator. And supplying the load to the load. The method according to claim 1 or 2, The inverter stores the excess power in the storage means and supplies the remaining power to the load when the generated power using the natural energy is larger than the load, and supplies the remaining power to the load if the generated power using the natural energy is smaller than the load. Supply of the combined power generation, characterized in that for supplying the stored power to the load. The method of claim 4, wherein The storage means is the minimum voltage level and the maximum voltage level is set, the power supply of the combined power generation, characterized in that when the power to be stored during charging reaches the maximum voltage level without passing any further charging. The method of claim 4, wherein The inverter checks the voltage level of the storage means when the generated power using the natural energy is smaller than the load, and if the inverter is less than a predetermined voltage level, the inverter additionally supplies power using the diesel generator without supplying power from the storage means. Supply of the combined power generation, characterized in that. A first step of storing the generated power using natural energy in a storage means; And And a second process of supplying the generated power using natural energy stored in the storage means to the load, comparing the supply amount required by the load, and thus charging the storage means with additional power generation or surplus power generation. The method of supplying a combined power source. The method of claim 7, wherein The power generation using the natural energy is a power supply using a wind power and the power using the solar power supply method of a composite power generation, characterized in that consisting of. The method of claim 7, wherein The further power generation is a supply method of a combined power generation, characterized in that made by a diesel generator. The method of claim 7, wherein In the second process, when the surplus power generation amount is charged in the storage means, when the charged electric power reaches the maximum voltage level of the storage means, the method of supplying the combined power generator is characterized in that the passage immediately passes without further charging. The method of claim 7, wherein In the second step, if the voltage level of the storage means is checked or less than a predetermined voltage level, the additional power generation method characterized in that the additional power generation without supplying the generated power using the stored energy of the storage means. The method of claim 7, wherein In the second step, when the additional power generation is performed, a part of the additionally generated power is supplied to the load while the rest is stored in the storage means.