Advanced Nonlinear Control of Single Phase Half Bridge Series Active Power Filter

Nonlinear Observation and Control of Series Active Power Filters in the Presence of Voltage Sags

“…The half-bridge converter operates under the technique of pulse width modulation (PWM) (e.g., [4,[16][17][18]).…”

“…The above-obtained model (5a)-(5f) cannot be used to design a controller to pilot the system under study due to the binary nature of the control input μ s . To overcome this difficulty, the different signals of the instantaneous model are replaced by their average values over the cutting period [4,17,18]. Doing so, we obtain the following average model, where the notations are defined in Table 1:…”

“…In this study, we are interested in single-phase halfbridge series active power filters connected between the power grid and the sensitive loads (e.g., consumer electronics, variable frequency motor drives, computer numerical control equipment, and automated systems and processes). Half-bridge topology of the inverter [3,4] enjoys several features compared to full-bridge topology [5][6][7][8]. The main features are the following: (i) a reduced number of power electronic components which entails lower cost, (ii) a reduced number of switches which results in less control functions increasing system reliability, and (iii) a reduced switching power loss of the inverter.…”

“…A prefatory version of this paper has been presented at the conference [4]. This journal paper differs from the conference version [4] in which (i) it proposes a nonlinear controller (whereas the conference paper assumed all signals to be accessible to measurements); accordingly, the present controller (includes a nonlinear observer) differs from the one (no observer) in the conference paper; (ii) it includes all proofs whereas these were incomplete in the conference paper [4]; and (iii) it contains more simulation results.…”