On Some Aspects of Distributed Generation System Planning

Abstract

This thesis presents the results of investigation on certain important aspects of optimal distribution system planning, such as (a) Determination of economics of PVG,(b)Determination of optimal location and sizing of PVG in the Radial Distribution feeders, and (c) Prioritizing the PVG location in a given Distribution system. The main contribution of this investigation includes (i) determining Economics of PV Generation Systems as Distributed Generation Applied to Radial Distribution Systems in terms of Internal Rate of Return (IRR) of investment, (ii) Development of simple planning method for the optimal Siting and optimal Sizing of PV Generation on the Radial Distribution Feeders and (iii) Development of a Strategy for the choice of PVG installations in a given Radial Distribution System newlineThis research analysizes the economics of the DG with PV Systems, taking a typical 400V distribution system. A detailed procedure adopted for performing the economic analysis is presented in this thesis. Benefits considered include Saving in the energy losses, Energy substitute by the PVG system, Capacity release in the Feeders and the Transformer. Discounted Cash Flow technique is used to assess the economics of the system, by computing the Internal Rate of Return.However, at the same time, inappropriate sitting and sizing of DGs may lead towards many adverse effects on the distribution system, such as voltage profiles, beyond permissible limits and increased network losses. Therefore, it becomes necessary to allocate DGs at optimal locations with optimal sizing. This research presents the results of the study carried out in a 400 V distribution system as well as in an 11- kV feeder in the Kanchipuram Distribution System in Tamil Nadu, India. The Power Utilities are beginning to acknowledge PVG as an economically viable alternative to deferring investment at generation, transmission and distribution levels, reducing the power loss, improving the voltage profile and meeting demand growth, thereby improving the distribution netw