Centralized voltage regulation of power distribution system with distributed generation

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The proposed project aims to design a centralized voltage regulation controller to solve the voltage rise issued caused by the interconnection of distribution generation (DG) in power distribution systems. Currently, Ontario is committed to bring online 10,700 MW of renewable energy generation from wind, solar, bio-energy by 2018. Correspondingly, Hydro One has enabled more than 1,800 MW renewable energy source-based DG connected to its distribution system. However, high penetration of DG at the distribution system level may cause voltage regulation problem for utilities due to reverse power flow on distribution feeders. As a result, the capacity of DG connection will be limited by the voltage regulation constraints defined by the utilities. Hydro One had been receiving load customer complaints of overvoltage and voltage fluctuation that could be traced back to some DG projects that had already been in operation. Effective voltage regulation approaches are emergent for Hydro One to install more capacity of DG in the next few years. This project will investigate the voltage rise problem for the Hydro One distribution system and verify the effectiveness of reactive power control technique for voltage regulation of active distribution network (ADN) with high penetration of DG. If successful, the project will develop a centralized voltage regulation controller which can 1) effectively regulate the voltage of ADN, and 2) be applied to the Hydro One distribution system. The centralized controller will coordinate the substation on-load tap-changing transformer (OLTC) tap control and the DG reactive power control to maintain the normal feeder voltage under various load and generation levels to provide optimal voltage regulation to electricity customers. During the process of voltage regulation, the centralized controller will also consider the post-contingency situation after DG trip to ensure post-contingency voltage with operating limits.