Digital signal processor implementation and performance evaluation of split capacitor, four-leg and three H-bridge-based three-phase four-wire shunt active filters
ABSTRACT In this paper a comprehensive study on the three-phase four-wire (3P4W) shunt active power filter (APF) is carried out on the basis of three system configurations. These three two-level voltage source inverter topologies are compared for 3P4W shunt APF, namely, split capacitor (2C), four-leg (4L) and three single-phase H-bridges (3HB). The performance of all three topologies, under an unbalanced non-linear load condition, is evaluated with a detailed digital signal processor (DSP)-based experimental investigation. The steady-state as well as dynamic performance of APF is studied to compensate for current harmonics, reactive power, current unbalance and neutral current. The advantages and limitations offered by each of the topologies are also discussed in brief.
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ABSTRACT: An active power filter implemented with a four-leg voltage-source inverter using a predictive control scheme is presented. The use of a four-leg voltage-source inverter allows the compensation of current harmonic components, as well as unbalanced current generated by single-phase nonlinear loads. A detailed yet simple mathematical model of the active power filter, including the effect of the equivalent power system impedance, is derived and used to design the predictive control algorithm. The compensation performance of the proposed active power filter and the associated control scheme under steady state and transient operating conditions is demonstrated through simulations and experimental results.IEEE Transactions on Power Electronics 02/2014; 29(2):687-694. · 5.73 Impact Factor
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ABSTRACT: An increased level of harmonics due to the proliferation of single-phase non-linear loads is raising serious concerns among utilities. Historically, passive filters have been proposed to reduce harmonics in MV utility applications. However, due to their limitations utilities are turning their attention to alternative solutions. At the same time, active filters are prohibitively expensive and are unlikely to become a realistic solution in the near future. In this paper a practical directional third harmonic hybrid active filter is proposed. A novel feature that adjusts the level of compensation provided by the filter based on the loading conditions of its passive components is introduced. Simulation and experimental results are presented. Issues related to utilizing existing VAr support capacitors for retrofit applications thereby achieving cost reduction and fail normal feature for increased reliability are addressed. Cost vs. performance curves are developed using factual utility harmonic data. Finally, the impact of a distributed filtering solution based on the proposed filter is shown using a simplified MV distribution system.Energy Conversion Congress and Exposition (ECCE), 2012 IEEE; 01/2012
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ABSTRACT: Custom power devices (CPDs) have been developed to solve the power quality problems of the distribution systems. Among these CPDs, distribution static synchronous compensator (D-STATCOM) attained a great interest to the researchers and practising engineers. In this paper, the performance of a reduced rating D-STATCOM has been thoroughly investigated for power quality improvement in three-phase, four-wire distribution systems. The complete arrangement considered in this work comprises of a three-phase, three-wire (3P3W) D-STATCOM, zigzag-delta transformer and a single-phase active power filter (APF). This hybrid approach significantly reduces the rating of the overall compensator and improves the performance under non-ideal utility voltage conditions. To show the efficacy of the compensator, extensive simulation studies have been carried out for both normal an unbalanced/distorted utility voltage conditions in MATLAB/SIMULINK® environment using power system blockset toolboxes. Moreover, experimental results obtained from the laboratory system further verify the viability and effectiveness of the compensator.Electric Power Systems Research 04/2013; 97:158–171. · 1.60 Impact Factor