Ongrid Hybrid Uninterruptible Power Supply

TECHNICAL FIELD

This invention generally relates to inverters and uninterruptible power supplies (UPSs) which are used in the field of solar energy (use of photovoltaic panel).

This invention particularly relates to a settlement developed by assembling the photovoltaic inverters with uninterruptible power supplies (UPSs), which eliminates the need for a qualified uninterruptible power and provides an economic return by transmitting the power from photovoltaic solar panel to an electrical grid.

BACKGROUND OF THE INVENTION

UPSs are used in technologies to supply the need for uninterruptible, clean, and qualified power. The aim of the UPSs is to preserve the loads connected to itself against power failure and problems that may occur in grids.

In the current UPS applications (Illustration 1 ), power from an electrical grid is conducted to the loads connected to UPS through various transformations. UPS uses the power from the electrical grid both for supplying the loads connected to itself and for charging the battery group or groups. As will be apparent from the descriptions, UPS does not transmit the power to an electrical grid; on the contrary, it is a system that consumes power. UPSs do not have a feature that allows the incorporation of the power from a photovoltaic solar panel into its own system.

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Illustration 1 - Current structure of an UPS Photovoltaic solar panels generate voltage in the form of direct current (DC). In order to conduct and use this voltage that generated in the form of DC, it should be converted into alternating current (AC) form that is used in grids. Photovoltaic inverters are used to perform this process. The current photovoltaic inverter systems (Illustration 2) transmit the power obtained from photovoltaic solar panels to a grid and are used to make the power obtained from photovoltaic solar panels become available. Therefore, photovoltaic inverter systems do not have a feature to prevent the load being subject to the problems that may occur in a grid. It cannot provide a solution in power failures occurred in electrical grids.

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Illustration 2 - Current structure of a photovoltaic inverter

In photovoltaic solar power systems, solar panels are connected in series to each other to reach a desired voltage level. However, in order to reach a desired power level, series solar panels are connected in parallel to each other. By this way, solar panel groups having desired power and voltage values can be established. Related to this subject, the American patent application US20120319489A1 can be shown as an example for the embodiments in the art. The recommended device in the American patent application allows equal voltages of series photovoltaic solar panel arrays. Therefore, it is possible to obtain more power from solar panel group. Accordingly, that application relates to more efficient use of solar energy. Solar energy (photovoltaic panel) compatible uninterruptible power supply device according to the invention is a device that allows the solar energy both to supply the load and to transmit the power to a grid. It is not a study related to more efficient use of solar panels.

Consequently, unlike conventional UPS technologies, it is necessary to develop a settlement, which simultaneously involves the UPS and photovoltaic inverter features, in the relevant field due to the above-mentioned negativities and insufficiency of the current solutions on the subject. OBJECT OF THE INVENTION

The aim of the invention is to eliminate the above-mentioned negativities and to improve uninterruptible power supply systems.

The aim of the invention is to eliminate the need for a qualified uninterruptible power and to provide an economic return by transmitting the power from photovoltaic solar panel to an electrical grid. The aim of the invention is to develop a settlement which both uses renewable energy resources and exchanges power with the electrical grid within a single unit.

One of the aims of the invention is to develop a settlement that can obtain a renewable energy from photovoltaic solar panels and draw a power from an electrical grid.

Another aim of the invention is to develop a settlement that can transmit the excess power obtained from the photovoltaic solar panels to the electrical grid and comprises all UPS system features. Other aim of the invention is to be able to supply the need of load by drawing power both from an electrical grid and photovoltaic solar panels in case the power obtained from photovoltaic solar panels is less than the load at the output of the device of the invention. In case the power obtained from photovoltaic solar panels is more than the load at the output of the device, the need of the load is supplied by drawing a power from photovoltaic solar panels and the excess power is transmitted to an electrical grid.

Another aim of the invention is to allow the production of single phase or three phase solar energy compatible UPSs in various power intervals according to user demands and renewable energy market needs.

This invention can be used in all fields in which UPSs are used and/or electricity is generated from solar energy as it can work both by the power obtained from photovoltaic solar panels and the power from an electrical grid. The invention, in photovoltaic solar panel compatible uninterruptible power supply systems, is a power supply device, which eliminates the need for qualified uninterruptible power, provides an economic return by transmitting the power from photovoltaic solar panel to the electrical grid, and is developed by assembling photovoltaic inverters with uninterruptible power supplies (UPS), includes:

an AC-DC Rectifier which converts alternating current voltage into direct current voltage an AC-DC Inverter in which direct current voltage that is generated by the said AC-DC rectifier and an DC-DC MPPT unit is converted into alternating current voltage

- an DC-DC MPPT unit which receives power from photovoltaic panels, raises the received power to the highest level, and supplies the DC-AC inverter unit and AC-DC rectifier unit

- a panel input terminal which allows the said DC-DC MPPT unit receiving power from photovoltaic solar panels, and an output connection terminal to which the loads are connected.

In order to fulfill the above-mentioned objectives, the invention includes:

- at least one grid input terminal which provides the AC-DC rectifier unit to supply the DC- AC inverter unit by drawing power from an electrical grid and to transmit the power that obtained from photovoltaic solar panels via the DC-DC MPPT unit to the said electrical grid

- in case of failure, in order to prevent lack of power in the loads connected to the output connection terminal,

at least one second resource to which the loads are transmitted and at least one Static Bypass Unit which conducts the power from the second resource to output connection terminal (8) via the second resource connection point.

Structural and characteristic features and all advantageous of the invention will become apparent via the below figures and detailed description that is written by making reference to these figures and thus, the evaluation should also be performed by taking into account these figures and detailed description.

FIGURES ASSISTING TO UNDERSTAND THE INVENTION Figure 1 is the general view of the components of the solar energy (photovoltaic panel) compatible uninterruptible power supply device and the relationship of these components between each other.

DESCRIPTION OF THE REFERENCES

1 . AC-DC Rectifier

2. Photovoltaic Solar Panel

2.1 Panel Input Terminal 3. Static Bypass Unit

4. DC-AC Inverter

5. Second Resource

5.1 Second Resource Connection Point

6. Electrical Grid

6.1 Grid Connection Point

7. DC-DC MPPT Unit

8. Output Connection Terminal

There is no need to necessarily scale the drawings and the unnecessary details might have been neglected to understand the present invention. Moreover, elements which are at least substantially identical or have at least substantially identical functions are demonstrated with the same number.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the preferred settlements of the solar energy (photovoltaic panel) compatible uninterruptible power supply device are described only for a better understanding of the subject.

The DC-DC MPPT (Maximum Power Point Tracker) unit (7) is the direct current voltage converter circuit. This unit raises the obtained direct current voltage to the suitable level of direct current and draws power from the solar panels (2) at the highest point. By using this unit, raising the electrical power obtained from photovoltaic solar panels (2) to the highest level and supplying the AC-DC rectifier unit (1 ) and DC-AC inverter (4) unit have become possible.

The AC-DC rectifier unit (1 ) has a feature that allows supplying the DC-AC inverter unit (4) by drawing the power from a grid and transmitting the power obtained from photovoltaic solar panels (2) via DC-DC MPPT unit (7) to the electrical grid (6) through grid input terminal (6.1 ). In case the power obtained from photovoltaic solar panels (2) is more than the need of the loads connected to the output connection terminal (8), by using this property, excess power is transmitted to the electrical grid (6) and an economic contribution is provided to a user.

DC-AC inverter unit (4) converts a direct current voltage into an alternating current voltage that can be used by the loads. Static bypass unit (3) is used to transmit the power from the second resource (5) to the loads connected to the output connection terminal (8). Therefore, lack of power in the loads connected to the output connection terminal (8) is prevented. (The second resource (5) can be an alternating grid connection, an uninterruptible power supply or a generator). Static bypass unit (3) is used to prevent lack of power in the loads connected to the output connection terminal (8) in case of failure in the AC-DC rectifier unit (1 ) or in DC-AC inverter unit (4).

The device of the invention generally includes;

• An AC-DC Rectifier (1 ) which converts the alternating current voltage drawn from a grid input terminal (6.1 ) connection point into direct current voltage and allows transmission of power to an electrical grid (6),

• A DC-AC Inverter (4) in which direct current voltage generated by the AC-DC rectifier (1) and DC-DC MPPT units (7) is converted into alternating current voltage and conducted to output connection point (8),

• A DC-DC MPPT unit (7) which draws power from the photovoltaic panels (2), raises the obtained power to the highest level, and supplies the DC-AC inverter unit (4) and AC-DC rectifier unit (1 ),

• A panel input terminal (2.1 ) which provides DC-DC MPPT unit (7) to draw power from the photovoltaic solar panels (2),

• A Static Bypass Unit (3) which is a semiconductor static switching unit of the power in the second resource (5) that prevents lack of power in the loads connected to the output connection terminal (8) by transmitting the load to the second resource (5) in case of failures,

• A second resource connection point (5.1 ) which provides power of the second resource (5) to the static bypass unit (3),

• A grid input terminal (6.1 ) which provides a connection to an electrical grid (6) and has an input for the AC-DC rectifier unit (1 ),

• An output connection terminal (8) to which the loads that are intended to remain without lack of power are connected.

The invention has a feature that allows transmission of solar energy obtained from the photovoltaic solar panels to the electrical grid (6) and the load without storing. Similar to this structure, there are systems in which power obtained from photovoltaic solar panels (2) is stored and not transmitted to the grid. It is also possible to run the invention with the principle of "first store, then use".

The feature of the invention is the common use of both an uninterruptible power supply and a central inverter system. It is also possible to create similar systems using separate units; an uninterruptible power supply and a central inverter system.