ABSTRACT
Grid codes have imposed immunity requirements on the generation systems that are connected to the transmission lines to overcome grid abnormal conditions. One of the requirements is to remain connected during a certain time when a fault, like voltage sag, is present in the network. During this fault scenario, a generator unit should remain connected for a predetermined amount of time and also provide reactive power to support the grid voltage. This phenomenon is referred to as fault ride-through (FRT). In this chapter, a constant active current reactive power injection approach for the FRT operation of grid-connected solar photovoltaic (PV) inverters in low/medium voltage grids is developed. This method controls the active and reactive power references to satisfy the grid code requirement and to avoid tripping due to overcurrent. This improves the speed response of the power converters which is important during voltage sags.
