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Due to increasing utilization of shunt active power filter (APF) in power systems, necessarily it has to be effective and reliable as much as possible. In this paper to enjoy of multilevel inverter advantages in active filtering task, a shunt APF based on flying capacitor multilevel inverter is presented. The power section of this active filter is viewed as analog to digital converter; as a result...
On the based stability analysis of DC capacitor voltage in inverter, this paper introduces a novel digital control approach applied to a three-phase three-leg active power filter. Simulation results verify that the active power filter with proposed controller can compensate the harmonics effectively.
This paper presents a comparative analysis about the command strategies of the fourth leg of the inverter of a three-phase active power filter and why we chose the inverter structure of four branches. The aim is demonstrate the “controllability” of the four branch active filter by controlling the fourth leg. The aims of the different command strategies are both the elimination of the neutral current...
The Static Synchronous Compensator (STATCOM) is increasingly popular in power quality application. The Voltage Source Inverter (VSI) based STATCOM is used for eliminating current harmonics and compensating reactive power. This VSI draw or supply a compensating current from the utility such that it cancels current harmonics on the AC side. STATCOM generates a current wave such that it compensate by...
The unified power quality conditioner (UPQC) is a combination of back to back connected shunt and series active power filters (APFs) to a common DC link voltage, which compensates voltage and current based distortions, independently. Generally the power conditioning devices are designed for complete compensation, irrespective of the requirement/priority. In this paper flexibility of selective compensation...
This paper presents a novel fuzzy logic controller in conjunction with phase locked loop synchronization based shunt Active Power Filter (APF) for harmonics and reactive power compensation in the distribution grid due to the non-linear loads. The Mamdani-type fuzzy logic is adpted and this controller is linguistic description, so it does not require a mathematical calculations. The active power filter...
Power electronic converters are commonly used for interfacing distributed generation (DG) systems to the electrical power network. This paper deals with a single-phase inverter for DG systems requiring power quality features, such as harmonic and reactive power compensation for grid-connected operation. The idea is to integrate the DG unit functions with shunt active power filter capabilities. With...
This paper presents a three-phase, five-level cascaded multilevel voltage source inverter based active filter for power line conditioning to improve power quality in the distribution network. The active filter compensates both reactive power and harmonic currents drawn by non-linear loads; additionally it facilitates power factor corrections. The compensation process is based on concept of p-q theory...
Trendy wind based Energy conversion systems identified as Self Excited Induction Generator (SEIG) is an isolated power source, whose terminal voltage and frequency are controlled by varying speed, excitation capacitance or load impedance. Since load changes from time to time, the output parameters mostly are controlled by either speed or by varying excitation capacitance. This paper presents a method...
This paper employs a single-phase unified quality conditioner (UPQC), an integration of shunt and series active filters (APF), to perform voltage and supply current harmonics mitigation and power factor correction. Both the shunt and series APFs are realized using a single-phase, two leg voltage source inverter (VSI). For the series APF the control strategy is based on Unit Vector Template (UVT),...
Nowadays, the increase in the usage of non-linear loads leads to deterioration of the quality of current waveforms at the point of common coupling of various consumers. Active power filters (APFs) has been used to mitigate the harmonic pollution in electrical networks. In the present work, cascaded multilevel inverter based shunt active power filter has been considered as an ideal current source and...
The unified power quality conditioner (UPQC) is a power conditioning device, which is a integration of back to back connected shunt active power filter (APF) and series APF to a common DC link voltage. For improvement of power quality (PQ) problems in a three-phase four-wire distribution system, two topologies are proposed in this paper. A comparative analysis of these topologies along with the most...
In this paper five level multilevel inverter based shunt active power filter is presented. Use of high voltage nonlinear load is considerably increased in industry and elimination of harmonics in HV system has become an important aspect. Implementation of multilevel inverter (MLI) for active power filter (APF) in HV system eliminates use of bulky and high cost transformer. The reference signal is...
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...
With the progress of “More Electric Aircraft”, power capacity of aircraft electric power system is increased. It is not easy for the power-quality characteristics of the system to be in compliance with the harmonic standards by using traditional method to compensate the harmonics introduced by the nonlinear load. Active power filter (APF) gets increasing usage in 50Hz power system for its high performance...
This document proposes the integration of different controller methodologies on a VSC (Voltage Source Converter) based HVDC (High Voltage Direct Current) stations and an active filter simultaneously. Hybrid control involves three different control techniques as follows: a discrete controller, which is in charge to regulate the voltage in the rectifier station, a fuzzy design manages the power flow...
This paper presents a five-level cascaded multilevel Voltage Source Inverter (VSI) based shunt active filter for Power Line Conditioners (PLC) to improve power quality. The reference current extraction is based on sensing main currents that are multiplied with estimated peak reference current. The proposed approach comprises Low Pass Filter (LPF) in conjunction with Proportional Integral (PI) controller...
This paper presents shunt active power line conditioners for power quality improvement such as harmonics and reactive power compensation due to non-linear loads. The novel compensation control strategy is based on positive sequence voltage detector with generalized Fryze currents minimization, an approach different from conventional methods; the purpose is to guarantee linearity between the supply...
This paper proposes a three-phase four wire current-controlled Voltage Source Inverter (CC-VSI) for both harmonic mitigation and PV energy extraction. For harmonic mitigation, the CC-VSI works as a grid current-controlling shunt active power filter. Then, the PV array is coupled to the DC bus of the CC-VSI. The MPPT controller employs the Fibonacci search method. The output of MPPT controller is a...
Power converter's output signal harmonic control is currently becoming immensely important in medium and high power applications due to the development of new grid codes. Advancement in transistor technology has lead to significant changes from large thyristor-equipped grid-connected inverters to smaller and fast switching IGBT (Insulated Gate Bipolar Transistors) equipped converters. These IGBT's...
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