有源配电网供电能力分析研究

发布时间：2018-07-25 17:52

【摘要】：近年来,随着能源安全问题的日益突出和环境保护压力的逐渐加大,可再生能源发电在世界范围内迅速发展。利用可再生能源的分布式发电开始大量接入配电网,对配电网运行和规划提出了新的问题和挑战。利用风力、太阳能等间歇性可再生能源的分布式发电,其出力具有很强的随机性和不确定性,在渗透率较低的情况下常被负荷的波动所掩盖,传统上仅考虑其电量价值。然而伴随分布式电源接入容量和数量的增加,配电网的负荷供应情况将发生较大变化,越来越多的负荷被就地消纳,系统应对负荷增长的能力得到提升,从而延缓了配电网升级改造的需求。因此,合理评估分布式电源的容量价值、科学计算有源配电网的供电能力具有重要意义。本文建立了有源配电网供电能力的概念,并提出了有源配电网供电能力的分析方法。首先,针对传统配电网供电能力计算方法未能计及电源和负荷在时序上的匹配关系等不足,提出了在满足一定可靠性要求下评估有源配电网供电能力的新思路。其次,基于蒙特卡洛模拟方法,建立了有源配电网电源充裕性的评估方法,并在此基础上通过启发式的负荷调整策略,分析了配电网依赖自身网架结构转供负荷的能力以及分布式电源的容量价值,提出了有源配电网供电能力评估方法。最后通过算例分析了有源配电网的可靠性水平、不同负荷类型以及分布式电源配置情况等因素对供电能力的影响,为指导配电网规划运行以及分布式电源优化配置提供了新的参考依据。
[Abstract]:In recent years, with the increasingly prominent problem of energy security and the increasing pressure of environmental protection, renewable energy power generation in the world has developed rapidly. Distributed generation using renewable energy has begun to connect to the distribution network in large quantities, which brings forward new problems and challenges to the operation and planning of the distribution network. Distributed generation with intermittent renewable energy, such as wind and solar energy, has strong randomness and uncertainty, which is often concealed by load fluctuation in the case of low permeability. Traditionally, only the value of its electricity is considered. However, with the increase of the access capacity and quantity of distributed generation, the load supply situation of distribution network will change greatly, more and more loads will be absorbed locally, and the ability of the system to cope with the load growth will be improved. Thus delaying the demand of distribution network upgrade and transformation. Therefore, it is of great significance to evaluate the capacity value of distributed power generation and calculate the power supply capacity of active distribution network scientifically. In this paper, the concept of power supply capacity of active distribution network is established, and the analysis method of power supply capability of active distribution network is proposed. Firstly, a new idea to evaluate the power supply capacity of active distribution network under certain reliability requirements is put forward in view of the shortcomings of traditional power supply capacity calculation method which fails to take into account the matching relationship between power supply and load in time series. Secondly, based on Monte Carlo simulation method, the evaluation method of power supply adequacy in active distribution network is established, and based on this, heuristic load adjustment strategy is adopted. This paper analyzes the ability of distribution network to rely on its own network structure to transfer load and the capacity value of distributed generation, and puts forward a method to evaluate the power supply ability of active distribution network. Finally, the influence of the reliability level of active distribution network, the different load types and the configuration of distributed power source on the power supply capacity is analyzed by an example. It provides a new reference for the planning and operation of distribution network and the optimal configuration of distributed power supply.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM732

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