Flexible control of converter-interfaced microgeneration

Previous research work has demonstrated that microgeneration improves security of supply and contributes to reduce carbon emissions. However, it has also been recognized that it imposes various challenges in particular with regards to network stability, control and protection. This paper focuses on controlling the power flow from converter-connected microgeneration units to the distribution network. A control scheme is presented which allows controlling independently each phase of three-phase converter-interfaced microgeneration sources. It is demonstrated that this technique provides additional control flexibility to balance voltages in a distribution network with high penetration of microgeneration. The performance of this controller is tested and explained using case studies implemented in PSCAD/EMTDC.