Patent ID: 9496717
Filing Date: 2016-11-15
CPC Classification: H02J

Claim Text:
1. A system for connecting a converter to an electrical power grid operating with a predefined real power P and a predefined reactive power reference Q, said system comprising: a) means for providing a grid reference signal, said means for providing a grid reference signal being operative to: provide a sampling connection between the grid and a Phase Locked Loop entity and to measure the amplitude and the phase of the grid voltage, b) means for setting an internal converter voltage to be the grid reference signal using the Phase Locked Loop entity, c) means for connecting the converter to the grid, d) means for measuring a current from the converter to the grid, e) means for calculating the real power p(t) and/or the reactive power q(t) exchanged between the converter and the grid based on the internal converter voltage and the current measured by means d), f) means for determining if said real power p(t) is different from the predefined power P and/or if said reactive power q(t) is different from the predefined reactive power reference Q, g) means for adjusting the converter by changing the phase and/or the amplitude of the internal converter voltage, if it has been determined by means f) that said real power p(t) is different from the predefined power P and/or if said reactive power q(t) is different from the predefined reactive power reference Q, said means for adjusting the converter operating on a repeated basis until the real power p(t) equals P and/or the reactive power q(t) equals Q whereby the converter is interfaced with the electrical power grid without use of an inductor.