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In this paper, the effect of Unified Power Quality Conditioner (UPQC) on transient performance of Common-Shaft Cascade Induction Motors (CSCIM) are performed and commonly used in deep well digging plant (i.e. oil wells). UPQC analyze these events include system starting, supply voltage sag and swells as well as plugging. Maintaining a power distribution bus voltage near sinusoidal at rated magnitude and frequency is known as power quality. The series converter used for protecting a sensitive load from sag, swell and the parallel converter for power factor correction, load balancing and regulation of bus voltage. The hybrid devices consist of two voltage source converters (VSCs) which are linked through a Direct Current (dc) bus. UPQC is implemented using controllers PI controller, for the purpose of Analyzing the Results. The open loop system and the closed loop system are simulated using Simulink and compared. The simulation results show that the UPQC has a great capability in order to enhance the transient performance .

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Abstract. Clay soil is usually stiff in dry state, but in wet state, it loses its stiffness and becomes softer. Various types of clay minerals have unique characteristics of low bearing capacity and certain compressibility. Especially Montmorillonite clay mineral exhibits more degree of swelling and shrinkage and loss of strength when moisture added. According to recent research, rice husk ash is a potential improving material based on its pozzolanic activity. In this study, to improve the engineering properties of expansive clay the admixture such as fly ash and rice husk ash will be added in different percentages as 5, 10, 15 and 20. For the laboratory test that includes atterberg’s limits test, standard proctor compaction test and unconfined compression test were conducted on locally collected expansive soil with various percentages of these two stabilizers in order to examine their influences. The maximum values of Unconfined Compressive Strength were obtained corresponding to 15% Rice Husk Ash and 20% Fly ash.