Active power distribution network reactive power supply configuration method based on node clustering partitioning

Abstract

The invention relates to an active power distribution network reactive power supply configuration method based on node clustering partitioning. The method comprises the following steps of: 1), acquiring power distribution network parameters and reactive power supply parameters and building a distributed power supply and load time sequence model, 2) acquiring a reactive-voltage sensitivity matrix of each time period of the time sequence model, 3) acquiring a comprehensive time sequence reactive-voltage sensitivity matrix based on the corrected reactive-voltage sensitivity matrix and the reactive-voltage sensitivity matrix weight of each time period, 4) determining candidate nodes based on the comprehensive time sequence reactive-voltage sensitivity matrix, and performing clustering partitioning on the candidate nodes by adopting a minimum distance method to obtain reactive power supply access nodes of each partition, and 5) performing reactive power supply optimal configuration based onthe reactive power supply access nodes. Compared with the prior art, the method disclosed in the invention solves the problem of site selection of the reactive power supply and the problem that the voltage regulation capability is limited due to the fact that only a capacitor is arranged to serve as the reactive power supply, and has the advantages of being good in economical efficiency and practicability and the like.

Description

technical field [0001] The invention relates to the planning field of distributed reactive power compensation in a distribution network, in particular to a method for configuring reactive power sources in an active distribution network based on node clustering and partitioning. Background technique [0002] With the continuous expansion of the access scale of distributed renewable energy in the distribution network, the problem of voltage fluctuations in the distribution network is becoming more and more obvious, and there is a new problem that the voltage of distributed generators (Distributed Generators, DG) access points exceeds the upper limit. Reactive power compensation is mainly used to solve the challenges brought by the lower limit of node voltage; on the other hand, the application of active management measures (Active Management, AM) also makes the configuration and operation of reactive power sources have further optimization space. How to fully take into account...

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Problems solved by technology

For the problem of site selection, the literature "Reactive power planning of distribution network considering grid-connected photovoltaic power output timing characteristics" (Chen Li, Zhang Jinguo, Su Haifeng. Journal of Electrotechnical Society, 2014, 29(12): 120-127) and literature " Reactive power planning of distribution network based on distributed power active-reactive power adjustment capability" (Shenyang Wu, Xiong Shangfeng, Shen Feifei, etc. Electric Power Automation Equipment, 2018, 38(12): 46-52) based on intelligent algorithms The heuristic calculation of reactive power compensation site selection and capacity planning for all nodes in the distribution network solves the problem of reactive power compensation site selection. When there are many nodes in the network, the amount of data processing is too large; the literature "Research on Reactive Power Planning of Distribution Network under New Energy Access Considering Demand Side Response" (Lu Renjun, Li Ran, Wang Jian, etc. Electric Measurement and Instrumentation) is based on the distribution network The magnitude of the reactive voltage sensitivity of each node is sorted, and the connection position of reactive power compensation is determined in turn, and then the compensation capacity is optimized, so that the dimension of the optimization problem is reduced and the problem is simplified

[0005] The compensation site selection method based on reactive power voltage sensitivity has clear meaning, and can decouple the site selection problem and constant capacity problem in reactive power compensation planning, which greatly reduces the complexity of the optimization problem. However, this method has the following limitations: The reactive voltage sensitivity is usually calculated from the load and DG output scenarios under a typical time section. In a traditional distribution network, when the wind and solar DG access is small, the change trend of the net load of each node in a day is similar. Therefore, The order of the sensitivity of each node under a typical section can determine the access position of reactive power compensation; and in the active distribution network with large-scale DG access, the net load change trend of nodes connected to wind and solar DG is compared with other undeveloped The nodes connected to the DG are very different, so the site selection plan based on the section cannot guarantee the global optimum at all times

Moreover, the determination of the access position by the order of sensitivity may cause several adjacent nodes with higher sensitivity to access compensation at the same time, resulting in the problem of repeated compensation

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