-This paper presents a new modified Contract Net Protocol (CNP) for microgrid operation based on multiagent system. The CNP is a widely used protocol for interactions among distributed problem solving. The Contract Net Interaction Protocol of the Foundation for Intelligent Physical Agents (FIPA-CNIP) is a minor modification of the original CNP for multiagent system applications. In this paper, a modified CNP (MCNP) based on the FIPA-CNIP is proposed for more specialized interactions among agents for microgrid operation. A multiagent system is designed and constructed for microgrid operation. A microgrid operation based on the multiagent system is tested to check the functionality of the proposed MCNP.

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Towards the improvement for service provision through portable devices which have limited resources, we propose a new design of energy-consumption-aware evolutional agent system. In the proposed design, platform specific parameters of local resources are taken into account to calculate the energy continuance index (ECI) of portable devices for controlling service provision in order to reduce power consumption of the portable platforms. Furthermore, we implement a multimedia communication system based on the proposal in order to evaluate its effectiveness. Results from the comparison with a conventional design show that the proposal is able to provide adequate services without affecting user experiences.