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SUMMARYThis paper proposes an efficient method to obtain the equivalent fundamental positive-sequence voltage for determining the shunt active power filter (APF) reference compensation currents, where the source voltage magnitude and phase angle at the fundamental frequency are detected by a simplified adaptive linear combiner neural network. The APF reference current calculator is developed and is realized on the DSP board through processor-in-the-loop (PIL) simulation for validating the effectiveness of the proposed APF control strategy, where the source voltages and the load currents are both distorted and unbalanced. In addition, results obtained based on the true positive-sequence fundamental source current after APF compensation and another classic approach are included for comparison. It is shown that results obtained by the PIL simulations with the proposed and compared methods agree very well. The proposed APF reference compensation current strategy is simple and practical, which provides a cost-effective and computationally efficient manner for the APF controller implementation with PIL simulations. Copyright

This paper presents application experiences of realtime simulation (RTS) techniques for harmonic and flicker studies of an industrial power system, where the system and nonlinear loads are properly modeled. A PC-cluster-based real-time parallel simulator is implemented under MATLAB/SIMULINK, where the studied system consists of an ac electric arc furnace, dc and ac motor-drive loads, and the static var compensator. Guidelines for model partition of the studied system and the solver settings under an RTS environment are reported. In addition, the most commonly used offline simulation with variable-step solver and the actual field measurements are included for comparison. Results indicate that the RTS achieves satisfactory solution accuracy within much less execution time and can be applied for more complicated studies such as installing new nonlinear loads with different levels of model complexities or designing/tuning mitigation devices of power-quality disturbances, where the repeated time-consuming analysis is required. Index Terms-Electric arc furnace (EAF), flicker, harmonics, motor drives, power quality (PQ), real-time simulation (RTS). I. INTRODUCTIONT HE INCREASING use of power electronic and arcing equipment, such as adjustable-speed motor drives (ASDs) and electric arc furnaces (EAFs), in the industrial environment has led to a growing concern for power-quality (PQ) disturbance and causing considerable impacts on the system and its equipment [1]. Literature survey shows that PQ studies associated with ASDs and EAFs mostly focus on harmonic and flicker assessments and the modeling evaluation [2]- [8], where many of the proposed methods are in the time domain due to the advantages of modeling interactions between the supply system and the nonlinear loads. The most familiar timedomain method is to perform the offline simulation (OLS) by using software packages, such as MATLAB/SIMULINK, PSCAD/EMTDC, SPICE, SABER, and EMTP-RV, so that the Manuscript

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