الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 194 |  |  |
| | | from | 194 | | |
Abstract
Technical advances and institutional changes in the electric power industry have resulted in a constantly increasing penetration of distributed generation (DG) integrated with distribution networks. For the connection of new DG installations to the networks a variety of factors have to be taken into account, including technical requirements imposed by utilities to ensure that the DG station does not adversely affect the operation and power quality of the networks. The use of power electronics at the front end of many DG types poses harmonic control requirements for their connection to the grid. In this thesis, a voltage source converter (VSC) is considered as a front end for a DG unit. To reduce the harmonic impact of DG on the grid the design of two different line filters; namely an inductance filter (L-filter) and an inductance-capacitance-inductance filter (LCL-filter) is required. The design is in accordance with harmonic standards that specify the level of current harmonics that can be injected into the grid. The design of a robust current control converter interface for DG is investigated, based on balanced and unbalanced grid voltage. Keeping distributed generation integrated with the grid under balanced, unbalanced grid voltage leads to improving power quality of the system with the main function of adapting the characteristics of the active and reactive power supplied from the DG to the grid without injecting harmonic currents. This thesis introduces a harmonic based strategy for sitting and sizing of DG sources integrated with distribution network. The procedure is used to candidate and ranks the optimum placement of DG and then examined optimum capacities of DGs in ranking sites of distributed power system based on harmonic limit consideration in IEEE-519. The strategy is applied to an actual Egyptian feeder to indicate the best site, size and configuration of DG connected to the feeder.