输电网可靠性评价指标体系的分析与改进
发布时间：2018-12-12 15:38
【摘要】：随着电网规模的增大和运行复杂程度的提高,电网企业有必要准确掌握现有电力系统所能提供的可靠性水平,衡量系统将电能从供应点输送到输电节点的输电能力(Transmission Deliverability)。基于运行统计的输电网可靠性评价能够真实的反应电网的设备、结构和运行管理水平,因此逐步受到各国重视。现阶段输电网可靠性评价是以输变电设施可靠性评价为基础,为了计及设施之间的相关停运特征,又进一步建立了回路的可靠性评价指标。然而电网运行环境的改变和可靠性评价内容的拓宽使得我国现阶段的可靠性评价指标在实际应用中逐渐显现了诸多局限。据此,本文在结合国外输电网可靠性评价指标体系的构建准则和特点的基础上,深入剖析了我国输电网可靠性评价指标体系,提出对输变电设施和回路的可靠性评价指标模型的改进。首先,从国内外设施可靠性评价指标的差异出发,对比了评价对象、可靠性状态划分和指标设置的不同,根据指标应用状况和可靠性水平对比提炼出对我国设施可靠性指标的需求从而扩展了多重故障停运、共因故障停运、不同寿命阶段故障停运和计及检修的故障停运这四方面的评价指标及元件停运模型。其次,电网企业对资产精益化管理的要求使得在保证输电网可靠性的同时需兼顾经济性,为此将全寿命周期成本理念应用到输电网可靠性评价中,确立系统的整个寿命周期内各阶段发生的成本与元件可靠性水平的关联关系,建立了输电能力模糊综合评价模型,完善输电网可靠性统计评价分析方法。然后,利用图论理论将变电站内元件的连接方式转换为可靠性逻辑上的串联或并联形式,再通过深度搜索算法就可将变电站主接线等价为最小回路集,并最终建立输电网的回路模型,分析了现有基于回路的输电能力评价指标存在的两大问题,并据此提出计及网络特征的输电能力评价指标。最后以青海省某局部输电网的实际案例为例,通过将本文建立的输电网可靠性评价指标与原评价指标的对比、分析和计算以及输电能力模糊综合评价模型的应用,证明了所建评价指标和模型的有效性。
[Abstract]:With the increase of power network scale and operation complexity, it is necessary for power grid enterprises to accurately grasp the reliability level provided by the existing power system and measure the transmission capacity of the system from the supply point to the transmission node (Transmission Deliverability). The reliability evaluation of transmission network based on operation statistics can truly reflect the equipment, structure and operation management level of the network, so it has been paid more and more attention by many countries. At present, the reliability evaluation of transmission network is based on the reliability evaluation of transmission and transformation facilities. In order to take into account the relevant outage characteristics between the facilities, the reliability evaluation index of the circuit is further established. However, with the change of power network operation environment and the widening of reliability evaluation content, the reliability evaluation index in our country at the present stage has gradually shown many limitations in practical application. On the basis of this, based on the construction criteria and characteristics of foreign power transmission network reliability evaluation index system, this paper deeply analyzes the transmission network reliability evaluation index system of our country. The improvement of reliability evaluation index model for transmission and transformation facilities and circuits is presented. First of all, according to the difference of the reliability evaluation index at home and abroad, the paper compares the evaluation object, the reliability state division and the index setting. According to the application status and reliability level of the index, the demand for the reliability index of the facilities in our country is extracted, thus expanding the multi-failure outage, and the common cause of the failure outage. The evaluation index and component outage model of failure outage in different life stages and taking into account the fault outage of inspection and repair are discussed. Secondly, the requirement of lean management of assets in power grid enterprises makes it necessary to give consideration to economy while ensuring the reliability of transmission network. Therefore, the concept of life-cycle cost is applied to the reliability evaluation of transmission network. The relationship between the cost and the reliability level of components during the whole life cycle of the system is established. The fuzzy comprehensive evaluation model of transmission capacity is established and the statistical evaluation method of transmission network reliability is improved. Then, by using graph theory, the connecting mode of the components in the substation is transformed into the series or parallel form of reliability logic, and the main wiring of the substation can be equivalent to the minimum loop set by the depth search algorithm. Finally, the circuit model of transmission network is established, and two problems existing in the existing evaluation index of transmission capability based on circuit are analyzed, and the evaluation index of transmission capacity taking into account the characteristics of the network is put forward. Finally, taking the actual case of a local transmission network in Qinghai province as an example, by comparing the reliability evaluation index of transmission network established in this paper with the original evaluation index, the analysis and calculation as well as the application of fuzzy comprehensive evaluation model of transmission capacity are made. The validity of the evaluation index and model is proved.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732
本文编号：2374833
[Abstract]:With the increase of power network scale and operation complexity, it is necessary for power grid enterprises to accurately grasp the reliability level provided by the existing power system and measure the transmission capacity of the system from the supply point to the transmission node (Transmission Deliverability). The reliability evaluation of transmission network based on operation statistics can truly reflect the equipment, structure and operation management level of the network, so it has been paid more and more attention by many countries. At present, the reliability evaluation of transmission network is based on the reliability evaluation of transmission and transformation facilities. In order to take into account the relevant outage characteristics between the facilities, the reliability evaluation index of the circuit is further established. However, with the change of power network operation environment and the widening of reliability evaluation content, the reliability evaluation index in our country at the present stage has gradually shown many limitations in practical application. On the basis of this, based on the construction criteria and characteristics of foreign power transmission network reliability evaluation index system, this paper deeply analyzes the transmission network reliability evaluation index system of our country. The improvement of reliability evaluation index model for transmission and transformation facilities and circuits is presented. First of all, according to the difference of the reliability evaluation index at home and abroad, the paper compares the evaluation object, the reliability state division and the index setting. According to the application status and reliability level of the index, the demand for the reliability index of the facilities in our country is extracted, thus expanding the multi-failure outage, and the common cause of the failure outage. The evaluation index and component outage model of failure outage in different life stages and taking into account the fault outage of inspection and repair are discussed. Secondly, the requirement of lean management of assets in power grid enterprises makes it necessary to give consideration to economy while ensuring the reliability of transmission network. Therefore, the concept of life-cycle cost is applied to the reliability evaluation of transmission network. The relationship between the cost and the reliability level of components during the whole life cycle of the system is established. The fuzzy comprehensive evaluation model of transmission capacity is established and the statistical evaluation method of transmission network reliability is improved. Then, by using graph theory, the connecting mode of the components in the substation is transformed into the series or parallel form of reliability logic, and the main wiring of the substation can be equivalent to the minimum loop set by the depth search algorithm. Finally, the circuit model of transmission network is established, and two problems existing in the existing evaluation index of transmission capability based on circuit are analyzed, and the evaluation index of transmission capacity taking into account the characteristics of the network is put forward. Finally, taking the actual case of a local transmission network in Qinghai province as an example, by comparing the reliability evaluation index of transmission network established in this paper with the original evaluation index, the analysis and calculation as well as the application of fuzzy comprehensive evaluation model of transmission capacity are made. The validity of the evaluation index and model is proved.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732
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