Patent ID: 8861239
Filing Date: 2014-10-14
Classification: H02J

Abstract:
1. A method of controlling the operation of a static energy supply unit connected to an ac supply network by a power converter, the ac network being configured to receive power from a power generation unit, the method comprising: measuring voltage characteristics of the ac supply network and providing voltage characteristic output signals indicative of the voltage characteristics during an operating condition of the ac supply network, the measuring including measuring a frequency of an ac voltage of the ac supply network; generating a simulated output voltage signal for each phase of the ac supply network having voltage characteristics responsive to the output signals; wherein each simulated output voltage signal is adjusted to represent a rotational inertia of the power generation unit when the frequency measurement is indicative of a decrease in the frequency; comparing the simulated output voltage signal for each phase and a measured ac voltage for a corresponding phase of the ac supply network; and controlling (i) operation of the power converter to vary an amount of power supplied to the ac supply network from the energy store based on the comparing.