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High-efficiency control of grid-tied inverters under unbalanced grid voltage condition is very important to improve the operation performance of the grid-tied inverters. On basis of instantaneous power theory of Current Source Inverter (CSI) under unbalanced grid voltage condition, this paper proposes a novel Quasi Direct Power Control (QDPC) strategy which adopts proportional resonant (PR) controller...
A 900 MVAr Static Var Compensator system have been installed in the Holeta substation in Ethiopia which was designed and manufactured by NR Electric. In order to strengthen the role of SVC in controlling reactive power, the paper presents a new design of control and protection System. There are three sets of 300 MVAr capacity SVC when the whole system works in the independent mode. They can also work...
A unified controller for a voltage source inverter (VSI) is one of the most important technologies for a microgrid to switch smoothly between grid-connected mode and islanding mode. Generally, as the control objectives of grid-connected and islanding modes are different, the controller adopts different control algorithms for the two modes, which demands to monitor the operating status of the microgrid...
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