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The intensive use of voltage source converters (VSCs) in grid-connected applications requires control strategies that should be robust against voltage transients, such as voltage dips. The voltage dips are mainly caused by short-circuit faults; many of them last only a few tens or hundreds of milliseconds and they are unbalanced in most cases. The grid connected VSC from back to back structures is...
The aim of this paper is to perform an analysis of the shunt Active Power Filter (APF) operating with unbalanced loads. The impact of the load imbalance on the APF performance is mathematically demonstrated and validated with experimental results using a 25 kVA shunt APF prototype. The APF operation in such conditions is affected by the appearance of DC-link voltage ripple at twice the grid frequency...
In this paper, practical applications of optimal and flexible controlled (OFC) active filters operating under distorted voltages with non-ideal compensator systems are investigated. In the previous works, the compensator system is regarded as an ideal inverter. On the contrary, this paper takes into account a set of important limitations of the real compensators in frequency domain. Some restrictions...
In this paper an algorithm for optimal design of active power filters using Strength Pareto multi-objective optimization approach is proposed. Some parameters of the repetitive current controller together with the inverter's DC bus voltage have been considered as design variables. Different optimizing pairs of objective functions including THD of the line currents and the transient response of the...
A new stationary frame control scheme for three-phase pulse width modulation (PWM) rectifiers operating under unbalanced voltage dips conditions is proposed in this paper. The proposed control scheme regulates the instantaneous active power at the converter poles to minimize the harmonics of the input currents and the output voltage. The paper novelty is the development of a new current-reference...
This paper is focused on control solutions for a single-phase inverter for distributed generation (DG) systems requiring power quality features as harmonic and reactive power compensation for grid-connected operation. Based on these characteristics, a new current reference generator based on sinusoidal signal integrator (SSI) and instantaneous reactive power (IRP) is proposed. Simulation and experimental...
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