插电式混合动力汽车大规模接入环境下的发输电系统可靠性评估

Reliability Assessment of Composite Power System With Large-Scale Grid-Integration of Plug-in Hybrid Electric Vehicles

电动汽车的充电行为具有随机性,未来插电式混合电动汽车(plug-in hybrid electric vehicle,PHEV)的大规模接入将对发输电系统的可靠运行造成重要影响。文章系统地研究了PHEV大规模接入环境下发输电系统可靠性评估的模型、指标和算法。首先,建立了PHEV充电需求仿真模型,包括PHEV的动力电池特性模型、用户随机出行特性模型以及PHEV充电功率需求仿真方法;其次,提出了PHEV对电网的穿透水平指标和PHEV接入规模对系统可靠性的灵敏度指标,能够表征PHEV接入对电网的影响;最后,提出了PHEV大规模接入环境下的发输电系统可靠性评估算法,采用扩展的状态空间分割算法可快速有效地评估PHEV接入后的系统可靠性水平。通过IEEE RTS算例分析了PHEV接入规模及充电策略等因素对系统负荷曲线和可靠性水平的影响,验证了所提指标和算法的有效性。

In view of the randomness of electric vehicles （EV） charging, the large-scale grid-integration of plug-in hybrid electric vehicles （PHEVs） will leads to evident impact on reliable operation of composite power system. The model, indices and algorithm of reliability assessment on composite power system under large-scale grid-integration of PHEVs are systemically researched. Firstly, a simulation model of PHEV charging demand, including the model of the driving and battery characteristics of PHEVs, the model of the travelling habits of users, and the simulation approach for the PHEV charging power demand, is established; secondly, the indices of PHEV penetration rate to power system and the sensitivity index of grid-integration scale of PHEVs to power system reliability that can characterize the impact of grid-integration of PHEVs on power system are put forward; finally, a quick and effective reliability assessment algorithm of composite power system under large-scale grid-integration of PHEVs, in which the extended state-space partitioning method （ESSP） is utilized to assess the reliability level of composite power system after the grid-integration of PHEVs, is proposed. By means of IEEE reliability test system （RTS）, the impacts of such factors as grid-integration scale of PHEVs and charging strategy on load curve and reliability level of composite power system are analyzed, and the effectiveness of the proposed indices and algorithm is verified.