Optimal Design of Renewable Energy System with Storage Towards Grid-Friendly Buildings

摘要

A new design method is proposed for optimal sizing of grid-connected renewable energy systems with battery electrical storages in cases where financial budgetary limitation apply. Optimal scheduling of daily energy usage is taken into consideration in the design, which aims to achieve lowest annual operation cost, including charging/discharging of energy storage and buying electricity from grid. Generally, the optimal scheduling problems are solved by model predictive control (MPC)-based methods. However, this often leads to heavy computation loads that makes the methodology difficult to apply for optimal design. A rule-based scheduling method is proposed to critically reduce the computation load. This makes it possible to introduce generic algorithm to search optimal combinations of sizes in the whole variable space. Evaluations are made to optimize the sizing of photovoltaic (PV) and battery electrical storage systems for an existing office building in Netherlands. Results confirm efficiency of proposed design method. Computation load of the rule-based method is only 0.0001 of a MPC-based method.