The Integration and Test of The New Fast Decoupled Distribution Load Flow Program in Cartesian Space

• Main Authors: Peng, Jau Chung, 彭昭群
• Other Authors: Lin, Whei Min
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/28296767121724924982

碩士 === 國立中山大學 === 電機工程研究所 === 83 === In order to gain a good performance, decoupled load flow method has been adopted in solving the transmission network and other related programs. Newton Raphson and Gauss-Seidel based algorithms are the most commonly used methods in solving the power flow .The former one has a better convergent characteristic, however,it needs rebuilding the new Jacobian matrix at each iteration. The latter one has a constant admittance matrix but it needs more iterations toconverge. According to the Cartesian network model,this thesis will try to integrate all the distribution equipment into the decoupled load flow program to further enhance the art in solving distribution load flow. The above assumptions are not valid when the system is under a severe condition, not to mention the application to a distribution system which has very different characteristics. developed a new model to deal with distribution networks which are normally radially structured with r>x and 3-phase imbalance. Based on the new model, this thesis first deals with the integration of various kinds of power equipment. These equipment include 3-phase transformers, co-generators, 3-phase capacitors, shunt capacitors, voltage regulators and so on. Each equipment will be studied to see if it can be incorporated in either the form of the equivalent current-injection or the form of an entry in the Jacobian matrix. A small system is also provided to include all kinds of equipment to observe the behavior of convergence. The robustness tests were also conducted by changing the feeder r/ x ratios. Other tests include feeder looping test, performance test and maximum error analysis. In addition, this thesis also analyzed the impact of the winding of the 3-phase transformers. The computer memory storage of every load flow method is discussed too.