Complementary Operations of Multi-renewable Energy Systems with Pumped Storage

Complementarity is an important attribute among different renewable energy sources(RESs).A multi-renewable energy system(MRES)offers an alternative to aggregate diverse RESs and can ensure the best attributes of their mutual characteristics.However,few papers conduct convincing research into the complementary operation of a MRES.This paper investigates the complementarities in a MRES that contains wind,photovoltaic,run-off hydro,pumped storage power plants and incorporates complementarity into the optimal operation of a MRES.The complementarity is theoretically summarized and first classified into two categories:natural and synthetical.To effectively capture the uncertainty and complementarity of RESs,the time-dependent clustering simulation technique is employed to generate their joint-scenarios.An equivalent runoff hydropower plant index is proposed,based on which a novel complementary operation model,that considers volatility and self-sufficient adequacy,is established.Results are presented and compared in a case study,which demonstrate the validity and scalability of the proposed methodology,reveals the complementarities under multiple time-scales,and illustrates the significance of complementary operations.