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EPEC 2011 Summary: Introduction Series Active Filters Summary Instantaneous power theory for voltage compensation Simulation results and discussions Shunt active filter controlled with p-q theory Series active filter controlled with p-q theory Voltage distortion compensation under a sinusoidal load current Conclusion A. Javadi 2 EPEC 2011 Introduction: Summary Introduction A. Javadi 3 EPEC 2011 Series Active Filters: Series active filter is usually proposed to solve voltage distortions and other related issues. They are more competent than shunt compensators as they are able to compensate current issues. Summary Introduction Series Active Filters: Series Active Filter Shunt Active Filter A. Javadi 4 EPEC 2011 Series Active Filters: • Similar structure with shunt active filters + connection transformer. • SSeriesFilter= 3%-10% SLoad , SShuntFilter=30%-70% SLoad Summary Introduction Series Active Filters: Ac#ve Filter Solu#ons to Power Quality Problems Ac#ve Filter Connec#on Shunt Series A. Javadi 5 Effect on supply Effect on load Current harmonic filtering Reac2ve current compensa2on Current unbalance Voltage flicker Current harmonic filtering Voltage sag/swell Reac2ve current compensa2on Voltage unbalance Current unbalance Voltage interrup2on Voltage flicker Voltage flicker Voltage unbalance Voltage notching EPEC 2011 Instantaneous power theory for voltage compensation: Summary Introduction Series Active Filters: P-q Theory A. Javadi 6 EPEC 2011 Instantaneous power theory for voltage compensation: Summary Introduction Series Active Filters: P-q Theory Instantaneous powers are divided into an average value and an oscillating portion: A. Javadi 7 EPEC 2011 Instantaneous power theory for voltage compensation: Summary Introduction Series Active Filters: P-q Theory A. Javadi 8 EPEC 2011 Simulation results and discussions: Shunt current distortion compensation Summary Introduction Series Active Filters: P-q Theory Simulation A. Javadi 9 Specifica2on Parameters (Shunt compensa2on) Source 208V , 60 Hz Load 10 kVA , R=7.5 Ω, L= 50 mH Load series inductance 1 mH Ac2ve filter series inductance 1 mH Filter Capacitor 10 μF EPEC 2011 Simulation results and discussions: Shunt current distortion compensation THDis=1.4% Summary Introduction Series Active Filters: P-q Theory Simulation va vb vc ia ib ic THDiL=21.76% A. Javadi 10 EPEC 2011 Simulation results and discussions: Summary Introduction Series Active Filters: P-q Theory Simulation A. Javadi 11 EPEC 2011 Simulation results and discussions: Series voltage distortion compensation (expected results, offline simulation) Summary Introduction Three-phase Load voltage Series Active Filters: P-q Theory Simulation A. Javadi 12 EPEC 2011 Simulation results and discussions: Series voltage distortion compensation Summary Introduction Three-phase Source voltage with distortion Series Active Filters: P-q Theory Simulation Sinusoidal current Three-phase Load voltage A. Javadi 13 EPEC 2011 Conclusion: If the load draws a sinusoidal wave form (which is not almost the case), the SAF based on the p-q theory inject a voltage in order to have a sinusoidal voltage wave form at the load side despite the presence of any perturbation in the source. It will also compensate all the non-active power, including the reactive an oscillating portion of active power, and the source will only supply a constant active power. Summary Introduction Series Active Filters: P-q Theory If the non active powers are compensated the voltage is then distorted, so this strategy could not satisfy the critical load. Simulation Sinusoidal current Conclusion The “instantaneous p-q theory” could not be used for a series active filter and the constant power strategy is not convenient for the series compensation. By changing the strategy of compensation from a constant power to a sinusoidal wave strategy it could be possible to overcome the issue. A. Javadi 14 EPEC 2011 A. Javadi