【作者】 李彦柳；

【导师】 郭创新；

【作者基本信息】 浙江大学 ， 电力系统及其自动化， 2012， 硕士

【摘要】 随着电力系统发输配电环节的发展以及人们对电网运行要求的提高,用户对电力系统运行的影响越来越受到人们的重视,如何从用户层面入手提高整个电力系统运行的安全可靠水平成为电力系统研究的另一个重点问题,大型工业企业作为用户群体的主要组成部分,是研究的主要对象。考虑到无功与系统运行的密切关系,本文从无功优化的角度入手对企业系统运行进行调整控制,改善企业级系统的运行特性,进一步对整个系统产生一定的有利影响。企业级无功优化采用改进的NSGA_Ⅱ算法直接对多个目标进行处理,通过时刻修正交叉和变异概率加快寻优速度,同时多个目标的并行处理提高了寻优的精度,通过算例仿真,表明该方法具有良好的寻优效果和寻优性能。在优化运行的基础上,考虑到企业系统运行中的波动现象,本文从无功补偿和无功备用两方面入手对企业系统无功引起的电压风险进行了分析,基于该风险分析可以确定系统无功补偿的可靠水平,提示工作人员在不同工作阶段对不同的设备采取相对应的重视程度以及适当的调整控制措施。为了提高风险评估的准确程度,本文建立了时变的设备停运模型,在时变停运概率的基础上进行风险计算,通过算例分析证明了模型的合理性和可用性。更多还原

【Abstract】 With the improvement of power generation, transmission and distribution and the development of people’s requirements on power system operation, users’influences on power system operation have been taken into consideration. How to improve the safty and reliability of total sytem from the user level is becoming another key point. As the most important constitution of the user group, large industrial enterprises have been the main reasearch objects.Considering the intimate connection between reactive power and system operation, we adjust the industrial power system operating through the measure of reactive power optimization in this paper. The improvement of industrial power system operation will have a certain beneficial influence on the total system. We use a modified NSGA_Ⅱalgorithm to decide multi objectives and speed the searching process by changing crossover and mutation probabilities timely. Meanwhile, the accuracy will be developed as the parallel disposing of different goals. Simulation results show that this method has favourable effectiveness and performance.For the concern of industrial operating fluctuation, we conduct risk assessment on the base of optimal operation. In this paper, voltage risk caused by reactive power is discussed from two aspects, reactive power compensation and reactive power reservation.The reliable degree of reactive power for industrial power system can be determined based on the risk analysis, which can be used to remind staff to pay attention to different devices at different time and adopt suitable measures. We establish a time-varying outage model to caculate outage probabilities for risk assessment, aiming to increase precision. The rationality and availability of this model have been certified by the simulation results.更多还原