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新息图状态估计应用研究
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摘要
随着电力系统的迅速发展,形成了跨区域、超高压输电网系统,网架结构和运行方式日趋复杂,电力系统状态估计的基础性作用日益突出,其准确性和实时性对电力系统安全、稳定和经济的运行意义重大。然而目前状态估计在拓扑变化(拓扑错误)和不良数据辨识方面还存在着一定的不足。新息图状态估计具有良好的实时性,本文对其在拓扑变化辨识、不良数据辨识及实用化方面进行了深入研究,旨在拓展新息图理论,提供快速有效的、可实用化的拓扑变化和不良数据辨识方法。
     本文深化了新息图建模,提出了基于断路器建模的新息图法,得到了利用节点-支路模型辨识节点拓扑变化和支路拓扑变化的方法。通过断路器支路将节点拓扑变化辨识转变为支路拓扑变化辨识,统一了新息图法辨识拓扑变化的模型基础。避免了利用详细物理模型辨识拓扑变化方法中的不足,且有计算量小、速度快,测量配置要求低、在测量不足的情况下仍可辨识等优点,能够辨识节点拓扑变化和支路拓扑变化邻近发生的情况。
     给出了新息差向量判据辨识不良数据的方法,以基于断路器建模的新息网络为基础,讨论了新息差向量辨识不良数据问题。由新息差向量给出新息图法中测量数据的相关性和不良数据的分类方式,指出新息图法中不良数据辨识的主导为连支上不良数据的辨识。分析了不同类型的不良数据存在时新息差向量的基本特征,综合运用这些特征,以辨识连支测量不良数据为主导的思路,研究了新息差向量辨识不良数据的规则,解决了新息差向量判据辨识不良数据过程中是否需要换树及如何换树的问题,为使用新息差向量准确排除测量系统中的不良数据提供了理论依据。
     研究了新息图法中回路新息相角和原理在辨识不良数据方面的应用问题,构建了与新息差向量判据完全独立的辨识不良数据的新判据,用其辨识新息图法中新息差向量判据不能辨识的可检测回路中不良数据和较难辨识的强相关不良数据。以新息差判据和回路新息相角和判据为基础,分析了新息图法中不良数据的可检测性和可辨识性问题,提高了新息图辨识不良数据的能力和效率。
     以上述的理论分析为基础,对新息图状态估计在大型电网中的应用进行讨论,首先分析了模型误差和测量误差对新息图法的影响,提出了新息图中生成树的优化规则,通过电力系统的物理约束和新息图法自身约束优化新息图的生成树,降低误差干扰;分析了新息图状态估计和静态状态估计的原理差异及各自的优缺点,提出了新息图法辨识不良数据、新息图法与拓扑分析相结合获取网络拓扑结构、传统状态估计算法估计系统运行状态的双渠道状态估计方法,尽可能的提高获取的网络拓扑结构的正确性和状态估计质量。最后针对大型电网管理采用的分区管理模式,研究了新息图状态估计分块算法,使各区域能够独立地实现新息图状态估计,可以快速的辨识本区域内的不良数据和拓扑变化,便于电网的安全运行和管理。
     采用实际电网对拓扑变化辨识、实用化等方法进行验证,结果表明了本文方法的可行性和有效性。
     本文得到国家自然科学基金项目(项目编号:50177006)的资助。
With the rapid development of power system, the Inter-regional, National Supergrid has been formed and its framework and the operation mode are trending complexity. So the fundamental effect of the state estimation becomes more and more prominent, and its accuracy and real-time have a great important meaning for the safety, stability and economy of the power system operation. However, there are still some insufficiency in identifying topology error and bad data on state estimation of power system at present. The Innovation Graph Technique is very good at real-time, so this paper goes deep into the research that the identification of topology change, bad data utilizing Innovation Graph Technique and its practicality in order to expand the theory of Innovation Graph Technique and supply a approach which can identify bad data and topology change in real lager-scale power network quickly and effectively.
     The model of the Innovation Graph is further studied in this paper. The new model of innovation network is established based on breaker model, The identification of bus topology is converted into the identification of branch topology utilizing breaker model, and it can identify both bus topology change and branch topology change.The model foundation of identifying topology change is unified. The disadvantage of using the detailed physical model to identify topology changes is avoided in the method, and it owns some advantages such as simple in calculation, fast in speed, and much lower requirement in measurement redundancy, and it also can identify bus topology error and branch topology change overlaped together .
     The method that identifies bad data utilizing the criterion of innovation difference vector is presented based on the Innovation network modeled. The correlation of measurement data and classification mode of bad data in the Innovation Graph State Estimation is presented utilizing innovation difference vector. It is pointed out that identifying bad data located on the link is dominant of identifying bad data in innovation graph technique. The basic character indicated from the innovation difference vector when the different type of bad data exist is analyzed and is focused to identify bad data located on the link. Therefore, the problem whether is necessary to change the tree and how to change it during the process of identifying the bad data based on the Innovation Graph Technique is resolved. It supplies a theory foundation for removing bad data in the measurement system exactly utilizing the Innovation Graph Technique.
     The application problem of using the sum of loop innovation angle (SLIA) in the Innovation Graph Technique to identify bad data is researched in this paper. The criterion of SLIA which is independed on the criterion of innovation difference vector is constructed, and is used to identify bad data in the detected loop and the strongly relevant bad data which the criterion of the innovation difference vector can’t identify. Based on the criterion of SLIA and the criterion of innovation difference vector, the detectability and identifiability of bad data in innovation graph technique is analysed. The ability and efficiency of identifying bad data utilizing the Innovation Graph Technique is improved.
     Basis on the theoretical analysis mentioned above, the applications of the Innovation Graph state estimation in large-scale electric network are discussed in this paper. Firstly, the influence of model error and arithmetic error to the Innovation Graph Technique is analysed and the rule of optimization is put forward. The optimize spanning tree in the Innovation Graph Technique utilizing physical restriction of power system and the restriction of Innovation Graph Technique itself is established to reduce the disturbance of error . Then the theoretical difference between the innovation graph state estimation and static state estimation and their advantage and disadvantage are analyzed, and the double channel state estimation method is presented. The method uses the Innovation Graph Technique to identify bad data, combines the Innovation Graph Technique and network configuration and utilizes static state estimation to get system state. This enhances the correctness of network topology and the quality of state estimation. Finally, the Innovation Graph Partition Technique is presented according to regional management of large-scale network system. The method makes that the innovation graph state estimation can be carried out respectively in each region, and that bad data or topology change can be identified in each region quickly and effectively. The method is convenient for the security operation and management.
     The proposed methods are testified in the large-scale electric network, and the results of real topology error identification indicate its feasibility and effectiveness.
     This research work is supported by the National Nature Science Foundation of China under Grant 50177006.
引文
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