DC Power Filter Design for a Neutral-Point Clamped Hybrid Multilevel Converter

Collins, C. T.; Green, Tim

doi:10.23919/ipec-himeji2022-ecce53331.2022.9807067

Cited by 1 publication

(1 citation statement)

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“…The reverse current produced by the inverter is introduced into the system to compensate for the harmonic currents; these currents are obtained using the p-q theory. To achieve neutral current compensation, two main topologies are used: (i) inverters to generate voltages; (ii) Inverters with two midpoint capacitors and a four-arm inverter (used as an active filter) (Barva et al 2018;Kumar et al 2022;Collins et al 2022;Zhang et al 2022;Challa et al 2022). Mainly, the four-wire shunt active filters, with three phases, have three branches with two switches controlled by the PWM technique and the fourth leg is on standby and has two switches controlled by the PWM technique.…”

Section: Description and Modeling Of The Studied Microgrid Systemmentioning

confidence: 99%

A four-line active shunt filter to enhance the power quality in a microgrid

Mostefa

Belalia

Lantri

et al. 2023

Int. J. Renew. Energy Dev.

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In recent years, power quality has become a major concern for electric network managers. Active filtering control schemes ensure improved power quality of the electric network and are able to maintain a desired voltage level at the point of connection, regardless of the current absorbed by nonlinear loads. Harmonics can cause vibrations, equipment distortion, losses and sweatiness in transformers. The main objective of this work is to enhance the quality of energy in a microgrid consisting of 100 kW photovoltaic (PV) system and a 50 kW battery storage connected to nonlinear and unbalanced loads. This paper proposes a the four-arm parallel active filter with a on Proportional-Integral (PI) controller to mitigate the harmonic problems in a microgrid. In addition, an algorithm has been designed to eliminate the neutral current. The identification function is one of the most particular approach for extracting harmonics, it involves providing a current reference imposed by the active filter in order to carry out the filtering operation. Both the performance and the quality of the current harmonic compensation's depend strongly on the strategy adopted for the generating the current reference. In this work, the instantaneous power strategy p-q is chosen outstanding the simplicity and effectiveness in implementation. The proposed control strategy has been tested under simulations and the results have shown good tracking of the references and a significant reduction in the Total Harmonic Distorsion (THD) level under highly unbalanced conditions of the nonlinear loads. The current THD is reduced from 43.64 before filtering to 3.74% after the application of the four-arm filter, following the recommendations of IEEE-519 standard (THD less than 5%).

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