Plug-in Hybrid Electric Vehicles (PHEV) technology shows great interest in the recent scientific
literatures. Vehicle-to-grid (V2G) is a interconnection of energy storage of PHEVs and grid. By
implementation of V2G dependencies of the power system on small expensive conventional units can
be reduced, resulting in reduced operational cost. This paper represents an intelligent unit
commitment (UC) with V2G optimization based on Modified Harmony Search Algorithm (MHSA).
MHSA was conceptualized using the musical process of searching for a perfect state of harmony, just
as the optimization process seeks to find a global solution that is determined by an objective function.
Intelligent UC with V2G optimization in power system is presented in this paper. Since the number of
PHEV in V2G is relatively high, UC with V2G optimization problem is more complex than the basic
A case study based on conventional 10-unit test system is conducted to facilitate the effectiveness of
the proposed method. Results show a significant amount of cost reduction with integration of V2G in
UC problem. Comparison of the results with those obtained by Particle Swarm Optimization shows
the effectiveness of the proposed method.