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KŘÍŽ, J., PISTORA, M., NOHÁČOVÁ, L., VELEBA, J.
POSSIBILITIES OF BLACK-START WITH USING RENEWABLE SOURCES ENERGY
KOMUNALNA ENERGETIKA / POWER ENGINERING, 16
The risk of a large loss of power supply (blackout) cannot be entirely excluded. Therefore the power grid has to be prepared for power restoration. One possibility of power supply restoration after blackout is a black-start of one energy source and starting up self-consumption of a larger power station.
Due to rapid increase in renewable energy sources installed power, many new large-enough power plants have been built in recent years. These power plants would be sufficient to power-up self-consumption of a larger power plant.
This paper evaluates the possibility of starting self-consumption of coal power plant Ledvice using wind farm Kryštofovy Hamry.
VELEBA, J., NOHÁČOVÁ, L., KŘÍŽ, J.
ELECTRIC POWER SYSTEM OPERATION – STEADY–STATE VOLTAGE STABILITY
KOMUNALNA ENERGETIKA / POWER ENGINERING, 10
There are many software possibilities capable to solve demanding power engineering problems. Continuation load flow analysis is shown along with Author's developed computational software in Matlab environment for full-scale voltage stability analysis of larger power systems. Steady-state system stability is defined as the capability of the network to withstand a small disturbance (fault occurrence, small change of parameters, topology modification) without leaving its stable equilibrium point.
For comparison, alternative approach is further introduced for voltage stability solution using the non-commercial optimization tool. This paper deals with steady-state voltage stability problem as one of the main topics of interest in today's power system operation and control worldwide.
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