Energy management of islanded microgrid for reliability and cost trade-off with PV, energy storage, and diesel generator

Abstract

Uncertainties in the solar photovoltaic (PV) power generation, random behaviour of consumer load power demand, and unexpected failures are the major factors for the consumer power interruption (CPI) hours, which reduce the reliable power supply rate or reliability index, of an islanded microgrid (IMG). One way to address this challenge is to complement the IMG with solar PV, energy storage system (ESS), and diesel generator (DG). This study first defines the reliability index of an IMG that equipped with solar PV, ESS, and DG. Then the authors propose an energy management strategy (EMS) for an IMG to maintain the reliability index above a given threshold limit while lowering the cost through higher utilisation of PV, lower CPI hours, and lower DG operating hours. They utilise real IMG consumers load power demand and solar radiance data for simulation studies to show how the proposed EMS achieves the desired trade-off in reliability and cost.

Keywords

• photovoltaic power systems
• energy storage
• energy management systems
• distributed power generation
• islanded microgrid
• diesel generator
• solar radiance data
• img consumers load power demand
• lower dg operating hours
• lower cpi hours
• energy management strategy
• ess
• energy storage system
• solar pv
• reliability index
• reliable power supply rate
• consumer power interruption hours
• unexpected failures
• consumer load power demand
• random behaviour
• solar photovoltaic power generation