Control of DSTATCOM using adjustable step least mean square control algorithm

A DSTATCOM (Distribution Static Compensator) using an adjustable step least mean square (LMS) control algorithm is presented for power quality improvement under linear/nonlinear loads. Adjustable step LMS control algorithm is used for calculation of reference signal source currents in terms of average weighted active and reactive components/elements. It reduces the effect of nonlinearity by updating the value of step size. It is able to solve the problem at fast convergence rate and steady state error compared to traditional LMS algorithm. This control algorithm is implemented using a DSP for improvement of power quality. Discrete simulation and test results show the satisfactory performance of adjustable step control algorithm under time varying loads.

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