Small hydropower plants (SHPP)

Water is easily available and most balanced source of energy, it is one of the cheapest and the most stable renewable energy source in terms of predictability . In Slovakia and Czech Republic, potential of water energy in mountainous areas is used minimally, which is a shame because the production of electricity of even very low power "somewhere at the end of the grid" is a great contribution to the network stability. Similarly, waterworks companies rarely use the gravitational potential of drinking water in mountainous areas to generate electricity. And if properly designed and built – it does not endanger fish or boaters. Energy from water gains incomparable advantages when comparing to the energy from wind and sun:
For small hydro power plants (SHPP, MVE is a slovak version of acronym) a device called MVE_CONTROL_LINK is offered. MVE_CONTROL_LINK is essentially unique power electronics device that operates on the principle of two inverters. One inverter addresses the speed control of water wheel motor (or turbine) to maximize the power, the other inverter (actively controlled rectifier) supplies the generated power directly to the grid. We work with designers and manufacturers of small hydro power plants or we deploy MVE_CONTROL_LINK to already existing plants - where we know it will be useful and effective.
MVE CONTROL should be deployed to MVE in cases where the varying power and variable water speed occur, for example:

For horizontal wheels directly placed in the river, the production of energy without devices like MVE_CONTROL_LINK is impossible. For example, speed of the water in Danube varies from 1.5 to 2.5 m/s, so this ratio must be adjusted to the orbital speed of a water wheel - generator. Excellent results were obtained when MVE_CONTROL_LINK was used with vertical water wheel motors, which controlled the wheel speed (generator) to operate the plant even at low flow rates and water speeds, when the classical solutions with a generator connected directly to the grid cannot be used.

All these adaptations by MVE_CONTROL_LINK are performed by maximization of power - it automatically adjusts speed of the generator to the speed and "energy" of water and thus it maximizes the power of MVE_CONTROL_LINK.

Supply of electricity to the grid is achieved by the control of the regenerative inverter, which also includes a network of independent circuits for the work of protections (current, voltage and frequency). Above the threshold values of output current, frequency and power parameters of the grid, MVE_CONTROL_LINK is disconnected from the grid by opening the input contactor device. MVE_CONTROL_LINK produces only active power - power factor is equal to 1.


MVE_CONTROL_LINK is available in custom enclosure versions - the basic enclosure can contain other electrical equipment associated with operation of the plant. Power of the generators can be up to 1.4 MW and a standard induction motor can be used as generator. MVE_CONTROL_LINK can be used to for off-grid power, but in these types of power plants the accumulation of energy needed to start the system and for excitation of the generator or a self-exciting generator must be used.