Sizing of active power filters using some optimization strategies

Abstract

Purpose -the change in the way of active power filters (APF) location can lead to overall cost reduction due to less number or less power of APFs required. The paper goal was to minimize the APF currents what is equivalent to solution with less apparent power of installed devices. The next step consists in development of new methods of APF optimal location. Design/methodology/approach -some scripts integrating optimization and harmonic analysis methods in Matlab and PCFLO software environments have been developed in order to achieve the goal. Findings -solution to the minimization problem determines the current spectrum of an APF connected to a selected system bus in accordance with some optimization strategies which among others enable minimization of THDV coefficients. Research limitations/implications -the APF control algorithm defined in the frequency domain and based on given current spectrum could lead to some problems with synchronization between APF instantaneous current and compensated current waveforms. Originality/value -there are many papers on APFs but usually systems in which an APF is connected near a nonlinear load are analyzed. Some attempts to solve the more complex problems of synchronized multipoint compensation have been already made but there is still no generally accepted and commonly used solution.

Comparison of classic and optimization approach to active power filters sizing and placement

“…Therefore, in terms of combinatorial theory, the obtained results contain the global minimum of the APF sizing and placement problem (all combinations are tested). Other methods of searching the set of obtained results are Number of simultaneously connected APFs (i ) , 9, 10, 11, 12, 13, 14, 15} 2 28 {(8,9), (8,10), (8,11), (8,12), (8,13), (8,14), y , (14,15)} 3 56 {(8,9,10), (8,9,11), (8,9,12), (8,9,13), y , (13,14,15)} 4 70 {(8,9,10,11), (8,9,10,12), (8,9,10,13), y , (12,13,14,15)} 5 56 {(8,9,10,11,12), (8,9,10,11,13), y , (11,12,13,14,15)} 6 28 {(8,9,10,11,12,13), (8,9,10,11,12,14), y, (10,11,12,13,14,15)} 7 8 {(8,9,10,11,12,13,14), y , (9,10,11,12,13,14,15)} 8 1 {(8, 9, 10, 11, 12, 13, 14, 15)} Classic and optimization approach to APFs also possible, but typically they require additional assumptions, (Wang et al, 2010) and usually lead to a local minimum (Grabowski et al, 2013). As it will be shown in the following sections, the presented classic approach, in spite of its popularity, does not have to lead to optimal results in terms of the total APF installation cost.…”

Cost effective allocation and sizing of active power filters using genetic algorithms

“…The other approaches consist in minimization of the voltage total harmonic distortion (THDV) or the telephone interference factor (TIF) in the system while keeping the compensator currents below limit values [6], [7], [14].…”

Active power filters – optimization of sizing and placement

“…However, as it has been discussed above the economical criterion can also be taken into account when selecting the best solution. The other way to take the cost into consideration consists in minimization of the RMS values of the compensator currents or a function based on arguments representing these values [17]. In the approach used in this paper the focus is set on elimination of current higher harmonics in given power lines [24] and as a result also reducing supplying voltage higher harmonics.…”