Active power filters – optimization of sizing and placement

Abstract

Abstract. The significant problem of compensator placement and sizing in electrical networks has been analyzed in the paper. The compensation is usually realized by means of passive or active power filters. The former solution is widely used mainly because of the economical reasons, but the latter one becomes more and more popular as the number of nonlinear loads increases. Regardless of the compensator type the most important goal consists in voltage and current distortion drop below levels imposed by standards. Nevertheless, the desired effects should be achieved with the minimum cost. So far a few objective functions have been proposed for this optimization problem. It is claimed that minimization of the compensator currents leads also to the minimum costs. This paper shows that such simplified approach could lead to suboptimal solutions and in fact a function g(·) reflecting the relation between the compensator size and its price must be incorporated into objective functions. Moreover, in this case it is very easy to compare solutions obtained using compensators offered by different suppliers -it is enough to change the function g(·). Theoretical considerations have been illustrated by an example of active power filter allocation and sizing.

Sensorless Vibration Diagnostics of Permanent Magnets Traction Electrical Motors–The Shaft Unbalance Example

“…The frequency analysis those waveforms often is difficult. The waveform of current is close to sinusoid, but voltage has number of highest harmonics which must be filtered using passive or active different kinds of filters [10][11][12]. Below presents frequency analysis of Komel's motor current of type: SMwsPA132S4 (Figure3.)…”

Genetic and combinatorial algorithms for optimal sizing and placement of active power filters

“…So far, the GBDT algorithm (Hong and Chang, 1996), combinatorial algorithms (Yamamoto et al, 1999;Dzieciątko, 2001;Pamplona and Souza, 2004;Maciążek et al, 2013), the TABU algorithm (Yan-Song et al, 2010), modified adaptive or discrete particle swarm algorithms (He et al, 2009;Ziari and Jalilian, 2010;2012;Moradifar and Soleymanpour, 2012) and genetic algorithms (Keypour et al, 2004;Ramos et al, 2006;Dehghani and Ziari, 2008;Yue et al, 2011;Grabowski and Maciążek, 2012) have been applied to solve the problem of compensator allocation and sizing. In this paper we use a combinatorial algorithm, which can be preferred to solve lower-size problems, and a genetic algorithm.…”

Current control with asymmetrical regular sampled pulse width modulator applied in parallel active filter

“…1 shows a schematic diagram of the analyzed medium-voltage power supply system [16]. Controlled twelve-pulse converter is powered via a transformer Tr2 with a vector group of Dd0y5 connections.…”