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Different control strategies for shunt active power filter (APF) are reported in literature several of them have satisfactory response under normal operating conditions, but there is still some confusion regarding the preferable controller for the shunt APF under normal and fault conditions. This paper evaluates the performance of shunt active filter for two different control strategies namely Hysteresis...
This paper presents how the PWM controlled AC locomotives are disturbing the electric network with harmonics. Previously the so called double domain simulation method was published. The double domain simulation is suitable for studying the different filtering methods, like the passive, active and hybrid filtering. In this paper the combination possibility with AC locomotives are discussed. The double...
A Multilevel shunt active filter is proposed to reduce the harmonic contents in source currents of a harmonic polluted three phase system supplying a non-linear load. The shunt active filter is designed with a seven level cascaded H-bridge inverter. To generate the required compensation currents Multicarrier PWM Current control method is used. The reference compensating currents are extracted from...
`Thin' power electronics concentrates on the design of minimal and cost effective power converters. Part of the research effort targets the direct processing of an AC input to an AC output without the use of an intermediate DC stage. Particular examples include the inverterless active filter and the controllable network transformer, both of which in their simplest form employ a buck switcher as the...
Small photo-Voltaic generators for residential applications are rapidly spreading all over the world in an effort to reduce polluting emissions. In this kind of applications the AC solar module concept has recently proven to be more advantageous than the conventional string architecture. According to the AC solar module concept, single PV modules are directly connected to the AC grid through a DC/DC...
Grid-connected voltage source converters using an LCL filter offer reduced harmonics in the grid current. The system modeling results in a multivariable system with cross coupling. Additionally, the system contains three state-variables instead of the one occurring in the case of grid connection using only one inductance. All the three variables must be measured or estimated. Also, the LCL filter...
The authors have devised a novel PWM control scheme capable of controlling a designated order harmonic while other low harmonic components are eliminated, based on the conventional low harmonic component elimination PWM control scheme. And it experimentally proved that the harmonic voltage in power systems could be suppressed, by means of controlling a self-commutated rectifier as a shunt active filter...
This paper analyzes the basic control principle of space vector PWM combined with hysteresis, and applies this method to control the Parallel Active Power Filter (APF). The simulation results through Matlab show that the output compensation current at any time can be real-time tracking the instruction current of the APF to reduce the current compensation error effectively, and eliminate the harmonic...
HAPF (HAPF) is composed of an active power filter (APF) and a passive power filter (PPF), for integrated harmonic compensation of unbalanced or nonlinear loads and compensation of reactive power. The PPF tunes at special harmonics and compensates reactive power to improve the power factor. The APF is composed of two full controlled three-phase PWM inverters. It traces harmonic current on system line,...
A new circuit configuration for the generation of both reactive power and harmonic current is presented. Unlike Thyristor Controlled Reactors (TCR), the voltage across an inductor is pulse-width modulated in such a way to produce the required line current. In this presentation the switched inductor is producing lagging reactive power. In conjunction with a fixed parallel capacitor, good quality variable...
This paper presents a novel control design of shunt active power filter to compensate reactive power and reduce the unwanted harmonics. A shunt active filter is realized employing three-phase voltage source inverter (VSI) and a control circuit. The shunt active filter acts as a current source, which is connected in parallel with a nonlinear load and controlled to generate the required compensation...
In PWM inverters, a time delay between consecutive semiconductor switching is introduced to prevent a short circuit in the DC link. This action causes the dead-time effect, which is detrimental to the performance of inverters. This paper deals with a new technique that speedup the feedback loop in Shunt Active Power Filter, in order to compensate the dead-time effect. A simple method based on an average...
During the past decades, three-phase three-wire system plays a very important role in the power electronics research, especially in the PWM studies. However, in the distribution site, there are many three-phase four-wire equipments installed. In these systems, single-phase loads and non-linear three-phase loads can produce unbalanced line currents, generating a current into the neutral line as a consequence...
A novel current-source active power filter (APF) based on multi-modular converter with carrier phase-shifted SPWM (CPS-SPWM) technique is proposed. With this technique, the effect of equivalent high switching frequency converter is obtained with low switching frequency converter. It is very promising in current-source APF that adopt superconducting magnetic energy storage component.
This paper describes a method for reducing harmonics of the input ac currents of the three-phase diode rectifier circuits. By adding a circuit, which serves with low switching frequencies, input voltage waveforms in the proposed rectifier can be improved. In this paper the proposed method are discussed by operating principle and analyzing waveform. The proposed rectifier circuit gives excellent input...
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