PERFORMANCE EVALUATION OF WIND DIESEL HYBRID STANDALONE SYSTEM

Abstract

This thesis studied the performance of the Wind-Diesel hybrid system. Power systems utilizing renewable energy such as wind and solar require control methods to maintain stability due to the real time variation of input energy and load, while maximizing the use of renewable resources. Wind-Diesel power system (WDPS) have been accepted and widely used as electricity generating systems for remote areas. In such cases, the WDPS serves an entire isolated load and is responsible for maintaining frequency and voltage stability (dynamic performance). Voltage of the hybrid system is controlled by the excitation system of the synchronous condenser such that voltage of the system is maintained at nominal values. The frequency is regulated by using Discrete Frequency Regulator block. This controller uses a standard three-phase Phase Locked Loop (PLL) system to measure the system frequency. The random power disturbances at the output of wind turbine generators can cause relatively large frequency voltage fluctuations. In a large grid, these fluctuations can have little effect on the overall quality of the delivered energy. However, with weak autonomous networks, these power fluctuations can have a marked effect, Hence control of voltage and frequency of isolated Wind-Diesel hybrid system is more challenging than grid connected systems. This project studied asynchronous wind generator short-circuits regime transients at rated power for variable and fixed wind speeds. Reliability of Wind-Diesel hybrid system plays vital role in performance of hybrid systems, Reliability evaluation of hybrid system helps system planner and utility administrators to evaluate, upgrade, size and optimize their hybrid systems. The Diesel generators in hybrid systems plays vital role in Reliability evaluation. In these Thesis Reliability indices of any Wind-Diesel hybrid system is evaluated by utilizing discrete wind speed frame analysis. Expected Energy Not supplied (EENS), EIR(Energy Index of Reliability), LOLE(Loss Of Load Expectation) were evaluated to study the hybrid system performance such that to ensure reliable power supply. Simulink is the tool that was selected for carrying out the simulations of this project. It has been developed by Mathworks and it works with its main product (Matlab)