Development of computer aided algorithms for three phase distribution system analysis and improvements | |
| Author | Banda, H. M. Wijekoon |
| Call Number | AIT Thesis no. ET-98-8 |
| Subject(s) | Electric power distribution--Sri Lanka Computer algorithms |
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resource and Development |
| Publisher | Asian Institute of Technology |
| Abstract | An efficient load flow solution technique is required as a part of the distribution automation (DA) system for taking various control and operation decisions. This thesis presents an efficient and robust tlu·ee phase power flow algorithm for application to radial distribution networks. This method exploits the radial nature of the network and uses forward and backward propagation to calculate branch currents and node voltages. The proposed method has been tested to analyse several practical distribution networks of various voltage levels and also having high RIX ratio. Initially the algoritlun was developed to analyse balanced distribution network and then it was extended to analyse tlu·ee phase unbalanced distribution network considering all the aspects of the branch models and detailed load modelling. 33kV distribution network of Uva province in Sri Lanka was analysed using the proposed method and the computational time taken to analyse this system have been compared with the time taken by the method proposed by D .Das et al [DKK95]. It was found that the proposed method was computationally faster than the method proposed by D. Das et al. The application of the proposed method was also extended to find optimum location for reactive power compensation and network reconfiguration for plmming and day- to- day operation of distribution networks. Conventional state estimation may fail to give solution to the distribution state estimation in many cases due to ill conditioned gain matrix and Jacobian matrix. Also these methods are applicable to systems with lower number of nodes and lower RIX ratio lines. This thesis also presents an efficient and robust tlu·ee phase state estimation algorithm for application to radial distribution networks. The proposed forward-backward load flow solution algoritlm1 has been further extended to three phase state estimation for distribution network with a few modification in the computational steps. The proposed estate estimation method has been tested to analyse a practical Indian distribution network with RIX ratio of 3.52. However, the conventional weighted least square method has failed to give a solution to this distribution network with same input measurement data. |
| Year | 1998 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Thukaram, D. ;Malik, A. S.; |
| Examination Committee(s) | Surapong C. ; |
| Scholarship Donor(s) | Government of Netherlands; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |