An optimal and flexible control strategy for active filtering and power factor correction under non-sinusoidal line voltages

Abstract

This paper gives a new insight into the concept of load compensation under distorted voltages. Achieving both unity power factor (UPF) and perfect compensation of current harmonics are not possible where a competition will arise between these two important factors. Through evaluating the present control strategies, a generalized, optimal, and flexible control strategy (OFC) for harmonic compensation of utility lines is proposed. The proposed control strategy, which provides a unified and highly flexible compensation framework has the ability of programming for perfect current harmonics compensation, or (UPF) accomplishment, or other newly defined objectives such as maximizing the power-factor subject to some adjustable constraints on the level of current harmonics and unbalancing via an on-line optimization algorithm. The strategy can fulfill the IEEE-519 standards requirements, while guaranteeing the best achievable power factor and optimum required rating for the compensator. Theoretical concepts and practical features of the proposed control strategy have been shown through extensive simulation studies using MATLAB/SIMULINK programs.

A DSP-Based Control Algorithm for Series Active Filter for Optimized Compensation Under Nonsinusoidal and Unbalanced Voltage Conditions

“…By solving (10) and (11), is obtained for an optimum power factor within acceptable THD and are the Kuhn-Tucker conditions to be satisfied.…”

“…On the other hand, making the voltage waveform identical to the load current waveform shape, the power factor will be close to unity but the voltage total harmonic distortion (THD) will deteriorate. Thus, there is a tradeoff between the power factor and voltage THD and a suitable optimization [10], [11] of the two is necessary. In addition to this, imbalance in the supply voltage, if any, must be compensated.…”

Harmonic Elimination Using STATCOM for SEIG Fed Induction Motor Load

“…Harmonics can cause excessive heating in coils and eventually may damage the coils. Custom power devices [1]- [4] are proved to be good for compensating power quality issues [5]- [8]. STATCOM is a type of flexible AC transmission (FACTS) compensator employed for power quality mitigation especially harmonics.…”

Sistema de compensación mediante filtro activo de potencia con sistema de obtención de las corrientes de referencia selectivo utilizando control 3D-3B SVPWM de la etapa de potencia. Aplicación a sistemas industriales a 4 hilos.

“…La utilización de V 1 + no es novedosa ya que en este mismo concepto se fundamenta el método PHC (perfect harmonic cancellation) [134]. Sin embargo, en [134] se utiliza la potencia activa total P para la obtención de las corrientes de compensación.…”

“…Sin embargo, en [134] se utiliza la potencia activa total P para la obtención de las corrientes de compensación. Esta estrategia de control hace que el conjunto formado por la carga y el compensador tome del generador toda la potencia activa en forma de P 1 + .…”