Control Algorithm Extension for Series Power Electronic Converter

The Low Voltage distribution network is becoming intricate due to the proliferation of distributed micro-generation from renewable sources. Due to this, the Distribution System Operators (DSOs) are faced by diverse challenges especially in managing the network voltage. To deal with it, one of the effective and economically viable solution is to use a Series Power Electronic Converter (SPEC), which continuously monitors and compensates the voltage at the point of installation in the network to a defined set-point and also responds to shallow power quality events like sags and swells. Thanks to an adopted strategy, this compensation is achieved purely based on reactive power avoiding costs related to active storage systems. Previous works shows SPEC capabilities even with various limits correlated to the load power factor, thanks to the implemented SPEC control logic which is developed to compensate voltage under passive, inductive or capacitive loads. As these strategies has a strong dependence on the type of load, the existing control logic needs to be updated for the SPEC to compensate for active loads like Photovoltaic. Hence in this work implementation of an Adaptive Energy Optimised Control (AEOC) algorithm which adjusts the voltage compensation strategy based on the active, passive, inductive or capacitive loading conditions is proposed. The designed algorithm is implemented as C function and is validated through simulations in Typhoon HIL for better practical applicability. The results show the enhancement of SPEC capabilities to operate under diverse loads.