This paper presents a study on the modeling of D-STATCOM used for reactive power compensation in a power distribution network. The power circuit topology and network simulation are modeled by using ATP/EMTP software. The model description of Phase Locked Loop (PLL), the measurement system, voltage regulation loop and sinusoidal PWM signal generators are derived and presented. The results show that fast dynamic responses and low harmonic content can be expected from the proposed control strategy. Index Terms--Voltage source converter (VSC), D-STATCOM, PWM, ATP/EMTP.
This paper presents the procedure of PI controller design of Unified Power Quality Conditioner (UPQC) for improving power quality in the distribution system. A mathematical model of the distribution system with the UPQC is thoroughly explained in this paper. The mathematical model that is founded has been used for designing the PI controller. In order to investigate the dynamic performance and design the controller, linear approximation technique is used. Linearization of the systems that is around the operating point provides a set of linear equations, and then multi-input multi-output (MIMO) transfer functions of the systems are obtained. Two controller design techniques are presented and compared. One is the sequential loop closure controller design with parameter tuning through the Bode diagram (SLC-BD). The other one is the controller optimization design with the genetic algorithms (CO-GA). The performances of these techniques are verified and compared by using MATLAB program. Simulation results reveal that the power quality in the distribution system can be enhanced by using UPQC with the proposed controller design.
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