Squares (RLS) identification algorithm and Kalman Filter as a parameters estimator are used for on-line model identification to obtain a dynamic equivalent model of the system. The two methods are compared to determine the most appropriate identification algorithm for this application. The PS controller is then adapted using the identified model. The proposed technique is tested on a single machine infinite bus system and a fifth-order multi-machine system. The results obtained demonstrate improvement in the overall system damping characteristics by applying the proposed adaptive controller as well as an enhancement of the power system stability in comparison to the conventional controller. Index Terms-Adaptive PS Controller, Kalman Filter Estimator, RLS Algorithm, SVC. SVC G B 615 978-1-4244-1726-1/07/$25.00 c 2007 IEEE T K svc svc s B

The elimination of low order harmonics in grid-connected renewable-energy inverter systems is desirable both from the point of view of grid health as well as efficient inverter operation. In this paper, one inverter (called reference inverter) employs pulse width modulation (PWM) with conventional selective harmonic elimination (SHE) to remove the 5 th and 7 th harmonics. By adjusting a delay in the gating signals to four inverters for example, it is possible also eliminate other higher significant harmonics, namely the 11 th and 13 th harmonics, without any increase in the switching frequency. This approach may be useful for high power grid-connected inverter systems supplied by alternative energy sources where switching losses may become prohibitive if the switching frequency is too high. Two and four parallel inverters systems are investigated and simulated in PSPICE and MATLAB.

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The undersigned certify that they have read, and recommend to the Faculty of Graduate Studies for acceptance, a thesis entitled "ADALINE Network Based Adaptive Controller for STATCOM" submitted by Anas Albakkar in partial fulfilment of the requirements of the degree of Master of Science.