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Hybrid UPS





Electricity, which emerged as a result of developments in industrialization and technology, has become indispensable in today's world. If we examine the growth of world population and growing economies we can see that the demand for electricity increases with every day. In order to meet this demand electricity generation plants using various technologies have been established
Electricity has usually always been generated by hydraulic power plants. Countries with improper terrain and no river potential however use thermal reactors in order to meet their electricity needs. On the other side the demand for electricity gets bigger and bigger. Therefore, it is an inevitable future that the demand can no longer be met with hydraulic or thermal plants. In this respect alternative and renewable energy systems such as solar and wind based plants are not only environmentally friendly but also a sustainable option and therefore very important for the future. But most of the said alternative energy sources are very dependent from natural conditions. Thus these sources can show large changes during the season, the day and even momentarily. This situation leads to the fact that the demand for energy cannot be met fully. Problems arising from variable situations can be solved by using these sources in form of a hybrid.


Current UPS applications take energy from the electric network, passes it through various transformations and transmits it to loads that are connected to the UPS. With the energy from the electric network the UPS not only powers the connected loads but also charges the battery group or groups. In other words, the UPS doesn't transmit energy to the electric network but consumes it. It doesn't have any feature to incorporate energy won from photovoltaic solar panels. Existing photovoltaic inverter systems can only transmit energy won from photovoltaic solar panels into the electric network. Thus there is no mechanism that would prevent network problems from affecting the load. It doesn't offer any solution to power cuts in the electric network. Since there is no product that combines a UPS and a photovoltaic inverter system, on the UPS market it lead to the development of such a technological solution.


The Hybrid UPS solar systems, which patent is owned by the developing firm Enel Enerji, are able to operate in coordination with solar systems or wind turbines. Thanks to the converters consisting of 10kW modules and MPPT technology, an energy transfer between the solar panels or wind turbines and the UPS system is ensured. The energy drawn by the load is won partially or completely by the solar panels or wind turbines. This way the system pays itself off after a while and the user begins to generate gain from the investment. It also is an environmentally friendly example.


Operation Structure of the System


The DC-DC MPPT (Maximum Power Point Tracker) unit is a direct current voltage converter circuit. It is the unit that corrects the DC voltage won by the photovoltaic solar panels to the correct level and ensures the power withdraw of the solar panels at the highest point. By using this unit it has become possible to raise the electrical energy obtained from photovoltaic solar panels to the top level and to power the rectifier and the inverter unit. The rectifier unit is able to draw energy from the network in order to power the inverter unit and at the same time it is able to transmit the won energy from the photovoltaic solar panels via the MPPT unit to the electric network. By using this feature the system is able to transmit excess energy, won by the photovoltaic solar panels, to the electric network in order to create an economic contribution for the user. The inverter unit transforms DC voltage into alternating current voltage so it can be used by the loads. The static bypass unit is used to transfer the energy, coming from the second source, to the loads connected to the output. This unit is used to prevent energy loss for the loads that are connected to the output of the UPS in case there is a failure in the rectifier or inverter unit.




Enel started with the development and manufacture of the Hybrid technology in their factory in Kütahya Tavşaşnlı with a total area of 50.000 m2. The growing importance of alternative energy sources has mobilized Enel and with solar and wind energy based UPS systems Enel was able to bring new life to the sector.


What are the advantages of the Enel Hybrıd UPS system?

The Enel Hybrid UPS is an innovative device is able to use renewable energy sources and exchange energy with the electric network within one unit. The Enel Hybrid UPS operates by drawing renewable energy from photovoltaic solar panels and energy from the electric network. It can also transfer the excess energy drawn from the photovoltaic solar panels to the electric network and it contains all features of a UPS system. If the energy, won from the photovoltaic solar panels, is lower than the load at the output of the device, it draws energy from the electric network and from the photovoltaic solar panels in order to meet the load requirement. If the energy, won from the photovoltaic solar panels, is higher than the load at the output of the device, it draws energy from the photovoltaic solar panels in order to meet the load requirement and transmits the rest to the electric network.