Optimization Framework for Harmonic Mitigation in Transmission Networks with Renewable Generation

This paper introduces the optimization framework for harmonic mitigation in transmission networks. The paper defines two possible harmonic mitigation problems, one with the global mitigation, and the other with the zonal harmonic mitigation which provides differentiated harmonic performance to customers in different zones of the networks. This paper analyzes the construction of appropriate objective functions for the two forms of problem descriptions as mentioned above, and introduces the approaches of selecting feasible/cost-effective mitigation schemes and appropriate locations for placing device-based mitigation solutions. The paper emphasizes the necessity to include the uncertainties of operating conditions in optimization process in order to construct realistic scenarios for harmonic performance assessment. It discusses the approaches that are widely used for sampling operating scenarios, and especially introduces the detailed procedure of using clustering techniques to select representative operating scenarios for covering the uncertainties of network behavior in simulation.