Improvement And Implement Of Connection Mode Identification Algorithm For Medium Voltage Distribution Systems

Connection mode directly determines the basic structure of distribution systems, which is the basis for planning and assessm ent analysis. This paper has studied and improved the connection m ode identifica tion algorithm s from the m ethods and programs based on computer -aided networ k planning for urba n decision-m aking system CNP40, the main work is as follows:1. The paper proposes a new m ethod of cl assification analysis on distributions systems with switch ing stations an d cust omer m odel. The original classification algorithm is based on the concept of one most typical mode for switching station. The classification concept is redefined through th e features analysis of the second-level feeders considering customer model and various modes of switching station.2. The double power radiation, double loop network and "N-1" standby connection can not be recognized with the original algorithm in CNP40, because of the unilate ral char acteristics. In th is paper, th e charac teristics of the three spec ial models are established and the results enrich the characteristics library, then complete the iden tification by mode identif ication theory , m aking the planning software currently used can identify all types of connection mode.3. Summarizes the calling mechanism of original the connection mode algorithm. The mechanism is improved for its complexity to promote the user’s convenience and the algorithm efficiency. Meanwhile, the algorithm can remain relatively independent and the code can be reusable with a modular design idea in this paper.4. New algorithm increases the fault tolerant design module for the abnormal data, which could be checked and adjusted automatically, then gives users the appropriate adjusted grid program s. This design not only achieves a key calculation goal especially for large-scale distribution systems, but also eliminates limitations of the original algorithm that must depend on topology check.The work above has been im plemented by som e algorithm program s. The examples in the paper have illustrated the effectiveness of the methods and programs.