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In this study, a cascade two-loop non-linear controller is developed for single-phase shunt active power filters which is robust and stable in a wide range of output current and DC-link voltage changes. A variable structure proportional–integral controller is designed to regulate DC-link voltage in the outer loop. Also filter output current is controlled in the inner loop using adaptive backstepping...
The interaction between the loads and grid impedances can cause deleterious effects on the dynamic model of shunt active power filters (SAPF). These effects may lead to instabilities on the control system, specially if the loads vary randomically. These side effects could be minimized if SAP F employs a robust control strategy which controller gains are adjusted by adaptation. To overcome these side...
Based on the time-domain analysis, a time-domain mathematical model of three-phase three-wire active power filter (APF) current control loop is established; Predictive control equation and its optimal feasible solution with minimum objective function value are gotten, and the sliding-mode control strategy of current control loop is deduced. A novel optimization-sliding mode control strategy is proposed,...
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