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At microgrids, classical grid-regulating generators are replaced by converter-interfaced distributed generation (DG) or energy storage systems (ESSs). This causes a reduction of the total inertia of the system and hence the microgrid voltage and frequency become more susceptible under power variations. DC microgrids are specially affected by this phenomena as systems with rotating inertia can not...
This paper presents a wide input range DC-DC converter with a robust control scheme for high speed generator energy storage systems. As the DC voltage converted from low-voltage high-speed generator may be lower or higher than the battery voltage, a step-up/down converter is needed for energy storage systems. The two-switch Buck-Boost (TSBB) converter is suitable for wide input voltage applications...
This paper deals with a voltage and frequency controller (VFC) of a stand-alone wind energy conversion system using an isolated asynchronous generator (IAG) feeding three-phase four-wire loads. The reference generator currents are estimated using the power balance theory to control the voltage and frequency of IAG system. Two-leg reduced switch integrated voltage source converter (VSC) with a battery...
This paper has suggested a new configuration for reducing the excitation need of synchronous generators. The configuration consists of a synchronous generator connected in series with a bi-directional current switch. The switch injects a series voltage which cancels the synchronous reactance of the generator. The series voltage is automatically generated by absorbing the magnetic energy stored in...
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