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Power-generation systems

Power-generation systems

The segment comprising power-generation systems offers a comprehensive palette of solutions reflecting the trend of decentralised power generation, demand for energy independence and heightened requirements for the quality of provided energy. Battery banks are finding their place in combination with renewable sources of energy both in households – especially in so-called island systems, where such equipment serves for accumulation of energy from renewable sources for later use – and in larger solar and wind power plants as battery stabilisers, where they actively aid the integration of these sources into the grid. Non-battery stabilisers then equalise fluctuations of grid voltage, thus providing protection and stability for sensitive applications and operations. Motor-generators can be used to generate electricity. For combined production of electricity and heat, it is advantageous to use co-generation units, which can be powered by both conventional fuels and, for example, biogas.

Grid stabilisers

The current legislation in the area of power generation allows relatively large voltage fluctuations in the grid. Of course, there are numerous applications where such fluctuations can cause damage or be completely unacceptable. This pertains especially to laboratories, research and development and high-tech industry, as well as the pharmaceutical and chemical industries and medical applications. These problems are actively resolved by so-called grid stabilisers. Non-battery grid stabilisers ensure very stable power supply for all connected devices (only 1.5% fluctuation!). The system does not contain any batteries, which require maintenance and replacement. Together with the system’s high efficiency, very low operating costs are achieved throughout its service life. Battery stabilisers (see Large battery energy storages) are intended for applications in the area of renewable energy sources and integration thereof into the grid.

Generation of electricity and heat

A full range of applications require an uninterrupted supply of electricity – typical examples are hospitals, data centres and production lines. For backup when only occasional use is expected or when mobility is required, diesel motor-generators are the best option. In the case when more frequent use is required, a gas-powered motor-generator is more economical. If generation of heat (and/or cooling) is required, it is appropriate to use combined sources for generating heat and electricity, i.e. co-generation units. These are characterised by very high fuel economy – the smaller amount of fuel is used for generating electricity and the larger amount is used as heat. Co-generation units are appropriate for sites in unfavourable locations, where the customer uses all generated electricity and heat and has a gas connection, as well as in the refurbishment of gas boiler rooms.

Island systems

Concerns about rising energy prices, the impossibility or costly nature of installing electrical connections and the desire for energy independence from the public electricity grid are the most common reasons for acquiring a so-called island system. During the day, solar panels produce electricity, which is partially used and partially stored in batteries for later use. At times when solar energy is insufficient, it is possible to offset the deficit with other sources (e.g. generators). This method can ensure complete energy autonomy and absolute independence while maintaining 100% comfort.

Battery banks

With the growing share of renewable energy sources, there is a greater need for accumulation of energy thus obtained both at the household level for self-supply at times when the sun is not shining, as well as at the distribution-system level as a regulation element actively guarding against fluctuations in the grid. Household energy storage units are intended primarily for island and hybrid systems, while large battery banks with short-term accumulation are used especially in large solar and wind parks, where they play an active role in integrating large generation plants into the grid.

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