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This paper presents a method to minimize the losses and the magnetic cores volume in a single-phase active power filter based in a two stages grid-connected PV system. The proposed circuit injects PV generated power into the utility, and always acts as an active power filter to compensate load harmonics and reactive power such that the input power factor is very high independently of the solar radiation...
In this paper, a novel control algorithm for three-phase four-wire shunt active power filter for the compensation of instantaneous harmonic current components in nonlinear loads is presented. Fundamental signal extraction is carried out using Harmonic Tuned Filter (HTF) without the Phase Locked Loop (PLL). HTF can efficiently determine the fundamental signal components from distorted voltage or current...
This paper shows an algorithm to control the DC bus voltage of a Shunt Active Power Filter (SAPF), based on the performance of the Proportional Integral (PI) controller. The power converter topology corresponds to a four-wire three-leg Voltage Source Inverter (VSI) with split capacitor. The algorithm is focused on the voltage control for each capacitor, such that the dc-voltages follow a reference...
This paper presents a method to minimize the losses and the magnetic cores volume in a single-phase active power filter based in a two stages grid-connected PV system. The proposed circuit injects PV generated power into the utility, and always acts as an active power filter to compensate load harmonics and reactive power such that the input power factor is very high independently of the solar radiation...
In this paper, authors propose a novel fourteen-band hysteresis technique to control the fifteen level packed U cells (PUC) converter. This topology was first introduced. It combines advantages of the flying capacitor and the cascaded H-bridge topologies. The study of the novel converter allows the establishment of the switches gates signals equations. In case of rectifier operation, the proposed...
This paper presents a method to minimize the losses and the magnetic cores volume in a single-phase active power filter based in a two stages grid-connected PV system. The proposed circuit injects PV generated power into the utility, and always acts as an active power filter to compensate load harmonics and reactive power such that the input power factor is very high independently of the solar radiation...
This paper proposes a conductance emulation based scalar control for shunt active power filter to compensate customer generated current harmonics and reactive power. Proposed technique emulates the combination of nonlinear load and shunt active filter as an equivalent conductance across the source voltage. If the utility voltage is sinusoidal, the shunt active filter compensates total current harmonics...
This paper proposes a modification on the Hybrid Active Series Filter (HASF) creating a topology named Hybrid Active Var Compensator (HAVarC) suitable to manipulate, in continuous way, the displacement power factor or voltage regulation. The HAVarC is composed by a small rating Active Power Filter (APF) in series with a capacitor bank. The main objective of this topology is to control the reactive...
This paper describes the technique developed to charge and to regulate the hybrid active power filter link DC. The developed strategy is based on the Modified Synchronous Reference Frame Controller. The ability of the hybrid topology in charging and regulating its own Link DC without external sources connection is analyzed. The accuracy and the dynamics are presented, and the measurements of active...
In recent years Operational Transconductance Amplifier based high frequency integrated circuits, filters and systems have been widely investigated. The usefulness of OTAs over conventional OP-Amps in the design of both first order and second order active filters are well documented. This paper proposes two first order voltage controlled all pass filters with phase tuning capability. Simulation results...
An on line partial discharge test technique on rotating machines fed by inverters is analyzed in this paper. All the research to determine the configuration of the components was developed using simulation in Matlab Simulink™. The important fact is that the entire model was made with all the components and situations that result from partial discharges on the insulation of electrical rotating machines...
Tidal energy is a cheap, clean and abundant source of energy that can be used to feed isolated loads as well as grid connected ones. The variation of output power with the continuous variation of tides can cause significant power quality issues, especially in the case of stand-alone rural loads. The presence of a FACTS device can introduce a significant improvement to the power quality of such networks...
Aiming at the problems that traditional PI control of DC capacitor voltage has Udc slow dynamic response, the period averaging dynamic model of APF including Vdc is established based on KVL. In order to have a good linearization control effect, the inverse control strategies is presented for three-phase four-leg Active Power Filter, and Aiming at the problem that the APF's dynamic model is a multi...
In this paper, authors propose a novel six-band hysteresis technique to control the seven level packed U cells (PUC) converter which was first introduced in. This converter combines advantages of the flying capacitor and the cascaded H-bridge topologies. The study of the novel converter allows the establishment of the switches gates signals equations. In case of rectifier operation, the proposed six-band...
The increase of the embedded production brings problems of energy quality which must be solved. Several literatures show that these problems can be reduced with the installation of Unified Power Quality Conditioners (UPQC). In this paper in alternative to the Theory of Instantaneous Power (p-q) and to the Direct Quadrature Zero transformation (dq0), one novel approach to the UPQC is proposed. That...
In this paper, a neural network based reference current computation method for active power filter (APF) control under non-ideal mains voltage with different load condition is proposed. The neural network controller has been designed to extract fundamental frequency components from non-sinusoidal and unbalanced currents. These fundamental frequency components will be used as unit templates. The APF...
Three-phase four-arm active power filter adds one arm to the three-phase three-wire active power filter. It adds a control variable but has the same control object. The paper introduces the control strategy of the three-phase four-arm APF. Then it analyzes Three-Dimensional Space Vector Pulse Width Modulation (3D-SVPWM) in the static abc coordinates. Finally, the simulation and experiment results...
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...
This paper presents a new control strategy for a high performance hybrid cascaded H-Bridge HB multilevel converter with integrated series Active Power Filter Stage APFS. Unequal DC voltage sources are used to energise the converter's HBs. This offers increased number of voltage levels using fewer number of series connected HBs. Simple hybrid stair-case/SVM modulation strategy is proposed to synthesise...
This paper proposes a new high-efficiency solar power conditioner suitable for interface with thin-film solar cells, which is composed of a zigzag-connected chopper (ZCC) converter and a series active power filter. The ZCC converter provides a bipolar rectangle voltage pulse, even where the negative terminal of the dc input is grounded without line- or high-frequency transformer. The series active...
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