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The selection of reactive power compensation and higher harmonic filtration method for an exemplary industrial plant was presented in the paper. Based on measurements carried out on the real object, four solutions were proposed i.e. a passive filter, a modified passive filter and an active filter without and with a higher harmonic filter. For the proposed solutions the proper simulations were performed...
In this paper the selection of parameters of single-phase shunt active power filter (APF) was described. The considered APF was controlled with using p-q algorithm. The purpose of the filter is to eliminate the harmonics of current source and power factor correction. The model of the APF with follower PI controller of compensation current, PI DC-link voltage controller and with additional passive...
The most practiced and acceptable approach to improve the power quality of distorted distribution networks is to install active power filters (APFs) at the point of common couplings (PCCs) of nonlinear loads. This approach has proven to be very effective since APFs fully compensate for the injected current harmonics at the PCCs that will effectively result in negligible voltage total harmonic distortion...
This paper presents the performance evaluation of a hybrid filter for current harmonic elimination and improved input power factor. Hybrid filter consists of a shunt active power filter and passive filters. In the proposed scheme, shunt active power filter operates at a very low switching frequency, thus giving higher conversion efficiency. The combined operation of shunt active power filter and passive...
In this paper, a new method is proposed to control the interface Inverter of distributed generators (DGs) in a microgrid. The objective of this method is to effectively compensate for the harmonic currents at the Point of Common Coupling (PCC) and the MG with the Absence of dedicated compensation devices, such as Active Power Filters (APFs). The proposed control method is composed of the Adjustable...
Rapid growth of non-linear loads in distribution systems has attracted power system engineers' attention from power quality point of view. Connection of the non-linear loads deteriorates power quality in the distribution system by introducing current harmonics. These current harmonics, when circulated in the electric network, interact with the system impedance and generate voltage harmonics. These...
This paper presents a new idea to benefit of eliminated harmonics current by using a new topology of hybrid active power filter (HAPF) to compensate harmonics current to be sinusoidal in order to feed some loads. The design and simulation of a new three phase HAPF circuit using a shunt active power filter (APF) connected in parallel with a capacitor (C) line of a (LC) low pass filter (LPF) has been...
The increase in non-linear loads in the electrical network deteriorates the voltage waveform quality. One of the most used methods to correct the quality lack is to use shunt, series or mixed topologies of active power filters. Mixed filters can compensate loads that generate voltage harmonics and current harmonics, but the economic investment is high. Commercial shunt filters are more widespread...
This paper proposes a single-phase hybrid active power filtering using Unified Constant-Frequency Integration (UCFI) as the controller. The proposed topology interconnects the passive filter with shunt active power filter through point of common coupling (PCC). The topology chosen for active power filtering is a cascaded H-bridge multilevel inverter (CHMI) which offers wide range of advantages over...
This paper deals with a unique combination of two inverters those may work as an active power filter (APF) or a STATCOM. Two inverters are switched at different frequencies. The low frequency inverter takes care of the reactive power demand of the system and makes the source current in phase with the voltage, while, the high frequency inverter mostly compensates for the harmonics. In the limiting...
This paper proposes the Unified Hybrid Power Quality Conditioner (UHPQC). The proposed topology manipulates, at the same time and in continuous way, the displacement power factor and also it mitigates the dominant harmonic component of the line current. The structure is composed by a small rating Active Power Filter (APF) in series with a single passive filter. The main objective of this topology...
Inter-harmonics currents cause parallel resonance between line impedance and passive filter, which puts the hybrid parallel power filter operating in dangerous condition. A novel feed-forward control method is proposed to suppress the resonance by detecting resonant frequency current in load current. The feed-forward control coefficient is independent with resonant frequency, which simplifies the...
Active power filter is a reliable and effective technology for harmonic elimination and reactive power compensation. Based on the traditional control strategy for detecting load harmonic current, a new multiple-loop composite control strategy is proposed. The new control strategy has five control loops, which are used for calculating reference voltage signal of the inverter by detecting the load harmonic...
This paper deals with a novel configuration of single-phase hybrid active power filter. One of the advantages of the proposed hybrid filter is its adjustable capability to determine voltage rating and current rating of active power stage by selecting appropriate values for its passive filter parameters. Equivalent circuit of proposed hybrid filter has been presented and its filtering characteristic...
This paper proposes transformer-less dual hybrid topologies suitable for rectifier type load. Performance of the reduced switch version of the network is highlighted. It consists of two inverters, one operates at a lower frequency (typically around 550 Hz) and the other operates at higher frequency (around 20 kHz). Less number of switches is used to improve reliability and reduce cost. The low frequency...
In this paper, a hybrid filter topology is proposed to minimize voltage harmonics, current harmonics and EMI noises in PMSM with hysteresis direct torque control (HDTC). The filter topology consists of IGBT active filter (AF), high frequency LC filter and trap filter. The coupling of the AF compensated voltage and the motor main voltage is achieved through series 1:1 transformer. The AF detects the...
In this paper a novel sliding mode control approach is presented for a medium-high voltage hybrid shunt active power filter, the harmonics suppression effect of which is restricted by the switching frequency of power semiconductor devices, and EMI caused by which is also related with the switching frequency nearly. The proposed control approach combines state variables tracking with PWM, in which...
This paper presents an investigation on influence of the control system time delay on the performance of the shunt hybrid power filter, consisting of a shunt passive filter connected in series with an active power filter. Frequency response of the shunt hybrid power filter is investigated by mathematical analysis and it is shown that existence of controller time delay degrades the harmonic compensation...
This paper deals with a harmonic filter to eliminate source current harmonics in power system. It is a combination of shunt passive filter and series active filter. The main section of the active power filter, a voltage source inverter, is connected between AC source and nonlinear load through a series transformer. Current harmonic compensation is achieved by injecting equal fundamental current instead...
This paper presents an investigation on influence of the control system high pass filter characteristics on the performance of the shunt hybrid power filter. The power filter is consisting of a shunt passive filter connected in series with an active power filter. Frequency response of the shunt hybrid power filter, tacking into account the effect of high pass filter (used in control system for extracting...
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