A Novel Method to Improve the Performance of Dstatcom Using Deadbeat Predictive Control Algorithm

In modern power system, the switching devices are generally used in combination with unbalanced reactive loads which produces current related Power Quality (PQ) problems by making source currents distorted and unbalanced. Usually a STATCOM is installed to support electricity networks that have a poor power factor and often poor voltage regulation. A Distribution Static Compensator (DSTATCOM) operating in Current Control Mode (CCM) is used to mitigate current related PQ problems. The main objective is to improve the performance of interactive distribution static compensator for address limitations of conventional Current Control Mode (CCM) and Voltage Control Mode (VCM) operations. In CCM operation, the DSTATCOM supplies reactive and harmonic component of load currents to make source currents balanced, sinusoidal, and in-phase with respective phase load voltages In the previous research, the compensator with three single-phase H-bridge Voltage Source Inverters (VSIs), driven by a single DC storage capacitor was used and passive filter capacitor is also used to provide the path for high frequency components for current. Thus the operation and control of the improved performance interactive DSTATCOM is proposed for the continuous and stable load operation. Using the control algorithm, the range of source voltage within which a DSTATCOM should operate in CCM is computed. The advantage of the proposed is that the algorithm depends upon the supply voltage, maximum and minimum feeder impedance and load current. Outside this range, operational mode of DSTATCOM is transferred to VCM. Losses in feeder and VSI are reduced which improves efficiency of the system. The proposed method is implemented in MATLAB/simulink and shows that the performance is improved with reduced loss, cost, and power rating VSI as compared to the conventional CCM and VCM DSTATCOM operation.