Design of an Active Power Filter (APF) for elimination of harmonics generated by an electric arc furnace (EAF) is the main objective of this paper. Method used for control of APF is predictive control based on dynamic programming and the Box-Jenkins model is used for EAF. Three different APF (three single phase APF, three phase-three wire APF and three phase-four wire APF) are analyzed for harmonic compensation of three phase EAF. Different problems for choosing of APF elements specially its switches are considered and various switches that satisfy simulation requests are analyzed. Parallel operation of APFs that increase accessible power of the controller and eliminate switching frequency limitations is discussed and developed for an example. In various sections simulations results obtained from EMTP software are shown and compared.

In this paper the idea of transfer function of a voltage source inverter (VSI) is used for simulation of a static var compensator (SVC) and a Parallel Active Filter (PAF). This concept makes simulation possible for the above-mentioned converters by generally available simulation software such as student version of Pspice. The idea of transfer function (TF) makes it possible simulation of VSI as a macro-model. In this way, it is not necessary to use semi-conductor switches of VSI or their control circuits. This subject decreases the node number of the circuits, the problem of convergence, the excessive run time and the large memory requirement for output file. The PSCAD/EMTDC simulation package is used as a professional simulation package to satisfy the results. In addition, a new control method for switches of PSCAD/EMTDC simulated converters is presented.

This paper presents a new control methodology for Active power Filters that provide an adaptive online harmonic estimation with partial and selective harmonic reduction schemes, which has been implemented within an integrated controller. The proposed approach is to provide partial and selective reduction of those individual harmonics which exceed the recommended levels as set by regulatory bodies reduces the rating of Active power Filters thus leading to cost savings. This approach contrasts with existing techniques in which the objective is to reduce all possible harmonic components to zero. Performance evaluation of the proposed technique for harmonic estimation for time-varying non-linear load is carried out when the simulation and experimental results show that the proposed control strategy provides a new alternative for harmonic reduction in power system.

In order to damping harmonic propagation effect, the Active power Filters (APF) are installed on distribution systems. This installation also may cause harmonic oscillation effect named Whack-a-mole. In this paper using simulation results, the two mentioned effects are decreased efficiently for a ten-bus power radial distribution feeder for any nonlinear load connections (harmonic current or voltage source) by using constant gain Kv=1/Zc The characteristic impedance, Zc, is nondeterministic and variable, so the APF's gain should be controlled Actively. In this paper the Parallel Active Filter gain is designed such that by producing proper compensating current, the harmonic distortion on APF bus is controlled and the harmonic propagation and oscillation effects are prevented by keeping the harmonic distortion in an allowable interval. By adjusting APF gain, the effective compensation current will decrease and so the power loss and cost, the benefit of applying adjustable gain APF.

In previous studies, Active suspension system in conventional powertrain systems was investigated. This paper presents the application of Active suspension system in Parallel hybrid electric vehicles as a novel idea. The main motivation for this study is investigation of the potential advantages of this application over the conventional one. For this purpose, a simultaneous simulation is developed that integrates the powertrain and Active suspension systems in a unified media where the power and input data between two systems are exchanged. Using this concurrent simulation tool, the impact of the Active suspension load on the internal combustion engine response is studied for both conventional and hybrid electric configurations. The simulation results presented in this study show that there are quite remarkable advantages for application of the Active suspension in Parallel hybrid electric vehicles in comparison with the conventional one.

In this paper, exploitation of Parallel matched Filters bank based on binary phase code is proposed, to overcome shift Doppler in ground based radars which use pulse compression technique. The mismatch loss due to target Doppler shift in radar receiver reduced by odd or even number of these Parallel Filters. By increasing the number of Filters over target velocity axis the central Doppler frequencies of the neighbor Filters approach together and consequently the overlap increases and results in the straddling loss decrease in output. Using MATLAB software, the attenuation in the output of the receiver matched Filter due to airborne target velocity was analyzed and a solution to calculate minimum number of Filters is proposed for minimum loss of SNR. Finally, two methods for implementation of Parallel matched Filters on FPGA in the airborne targets radar receiver are presented and compared.

In this paper, a Lyapunov-based adaptive 2nd-order sliding mode controller is proposed to control the current in an Active power Filter (APF). The penetration of APFs has been exponentially increased because of their high flexibility and fewer resonance problems. Moreover, they can compensate high range of current harmonics and reActive power. The voltage and current control loops have always been interesting areas for researchers since the satisfactory performance of the APF is highly dependent on these control loops. A sliding mode controller (SMC) is a mighty controller when uncertain conditions are considered. However, in order to reduce the chattering- high-frequency switching- and improve the steady state operation, stability, and robustness of the controller, it is usually decided to adaptively tune the gains of the controller. In this paper, a simple-structure adaptive SMC (ASMC) is proposed which can be implemented easily. This ASMC is shown to be stable using the Lyapunov theorem and proved with SIMULINK simulation that it has less steady state error, less chattering, and faster dynamic response compared to the conventional SMC.