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Reliability Impacts of Plug-in Hybrid Electric Vehicles on Power Systems



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Modern power system aims to provide reliable, economic, as well as environmental friendly power supply to its customers. In the past few decades, power systems are going through considerable changes to both the power consumption side as well as the power generation side. The power system planners are faced with growing challenges in maintaining acceptable level of system reliability as new types of loads and generation introduce increased uncertainty in power system planning and operation. New types of electric devices or loads are often introduced in the market to provide customers more convenience and energy efficiency of utilizing electric power. Electric Vehicle provides an alternative to conventional transport vehicles that burn petroleum fuel and release harmful greenhouse gas emissions. Plug-in hybrid electric vehicle (PHEV) is a relatively new model of EV with more flexibility, and is considered in this research to assess the impacts of charging behavior on the overall power system reliability. PHEV load is different from other types of electric loads as it introduces high variability and uncertainty, and therefore, requires proper modeling of its special characteristics. Different charging scenarios significantly influence power system reliability. This thesis provides a PHEV modeling methodology that incorporates the uncertainty in charging and driving behaviors using Monte Carlo Simulation (MCS) method. As PHEV sales are increased in response to environmental support, their impacts to system reliability will also increase. A range of reliability studies are carried out in the IEEE Reliability Test System (IEEE-RTS) to investigate the impacts of PHEV charging on system reliability. The system reliability degrades significantly with increase in PHEV penetration if PHEV owners charge their vehicles as soon as they arrive home from work. This effect can be mitigated by introducing a policy for delayed charging. Access to public charging will increase as PHEV increase in the future. The results show that a policy to manage public charging will be important to maintain power system reliability within acceptable limits. As the growth of PHEV is mainly driven by perceived environmental benefits, this research also explores the interactions between PHEV load and wind energy, and their combined impact of power system reliability. Based on the analysis of the results from case studies performed on the IEEE-RTS, this research provides valuable input for future power systems that are expected to support more PHEV and renewable energy.



Plug-in hybrid electric vehicle, power system reliability, probability modeling, reliability modeling



Master of Science (M.Sc.)


Electrical and Computer Engineering


Electrical Engineering


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