Estimation of energy self-sufficiency rate by EMS simulation using SPICE

Abstract

Energy management system (EMS) using renewable energy such as sunlight is expected to build a low-carbon society. In this paper, we report the modeling of EMS components using SPICE (simulation program with integrated circuit emphasis) and the estimation of the energy self-sufficiency rate by EMS simulation. We develop the simulation models of photovoltaic (PV) power generation system, storage battery system, and electric appliances for EMS simulation. These models are constructed by the models of electric circuit elements in SPICE. To switch and control the sources of electricity such as commercial power supply and PV power generation, the switching control module is constructed using the Verilog-A language. We simulate the energy generation and consumption, and estimate the energy self-sufficiency rate and surplus energy per month in spring, summer, and winter.