Security Constrained Unit Commitment (SCUC) is carried out by power system operators to determine the optimal participation of generating units to meet the load demand while satisfying units’ and systems’ constraints as well as the desired level of security. With technological advances in the realm of communications and development in the infrastructure, a proper environment for the active contribution of customers has been formed. This new structure has enabled the consumers to play a vital role in the market via Demand Response Programs (DRPs) and coordinated aggregated Plug-In Electric Vehicle (PEV) fleets. These new resources could be a merit for the power system provided that they are employed correctly and in coordination with the rest of the system. The SCUC is where DRPs and PEVs could be optimally addressed to exploit their full potential.

This paper tackles the problem of SCUC in the presence of DRPs and aggregated PEV fleets. The objective is to lessen the operation cost provided that all constraints are satisfied. Different constraints including those related to the system, units, transmission system, DRPs, and PEVs as well as the security constraints are taken into consideration. The SCUC is modeled as a two-stage stochastic mixed-integer programming problem and an appropriate model of PEVs is derived to facilitate the integration of these resources into the grid while considering their charging and discharging characteristics as well as efficiency. Moreover, a suitable model of DRPs is introduced in this study based on the concept of price elasticity of demand.

The proposed approach is practiced over the IEEE 24-bus Reliability Test System (RTS) to analyze the effect of the smart grid on SCUC. Obtained results demonstrate that with proper deployment of DRPs and PEVs the operation cost could be lessened while the security of the system is improved.

电力系统运营商执行安全约束单位承诺（SCUC），以确定发电机组的最佳参与度，以满足负载需求，同时满足机组和系统的约束以及所需的安全级别。随着通信领域的技术进步和基础架构的发展，已经形成了一个为客户的积极贡献而创造的适当环境。这种新的结构使消费者能够通过需求响应计划（DRP）和协调的综合插电式电动汽车（PEV）车队在市场上发挥至关重要的作用。只要正确使用这些新资源并与系统的其余部分配合使用，这些新资源对于电力系统可能是一项优点。在SCUC中，可以最佳地解决DRP和PEV的问题，以发挥其全部潜力。

本文解决了在存在DRP和聚集的PEV车队的情况下SCUC的问题。目的是在满足所有约束条件的情况下降低运营成本。考虑了与系统，单元，传输系统，DRP和PEV有关的各种约束以及安全约束。将SCUC建模为两阶段随机混合整数规划问题，并推导出适当的PEV模型，以在考虑其充电和放电特性以及效率的同时，促进将这些资源集成到电网中。此外，本研究基于需求价格弹性的概念，引入了一种合适的DRP模型。

该提议的方法在IEEE 24总线可靠性测试系统（RTS）上进行了实践，以分析智能电网对SCUC的影响。获得的结果表明，通过适当部署DRP和PEV，可以降低运营成本，同时提高系统的安全性。