Harmonic problems are increasing on MV systems, especially with the application of power factor correction capacitors or extensive underground networks that resulting resonances close to the fifth harmonic. This paper describes two case studies of solving harmonic resonance problems on distribution systems with the design of harmonic filters that provide both power factor correction and harmoni...

This paper analyzes the way to increase the energy efficiency of three phase converters applied to control AC motor drives, through the reduction of the total harmonic distortion (THD) of the output voltage and the reduction in the switching losses in the PWM inverter. The aim is to develop a system which selects the most adequate modulation technique required to simultaneously optimize the har...

Power quality management is the main problem that the industry is facing today. This is mainly affected by the generation of harmonics. The growing use of electronic equipment produces a large amount of harmonics in distribution systems because of non-sinusoidal currents consumed by non-linear loads. As we know for the better quality of power, the voltage and current waveforms should be sinusoi...

Environmental conditions and operational modes may significantly impact the distortion level of the injected current from single-phase grid-connected inverter systems, such as photovoltaic (PV) inverters, which may operate in cloudy days with a maximum power point tracking, in a non-unity power factor, or in the low voltage ride through mode with reactive current injection. In this paper, the m...

Multiphase induction machine; Rectangular air–gap flux; Third harmonic injection; Eleven-phase Abstract This paper presents a modified V/f control strategy using neural network with an improved flux pattern using third harmonic injection for multiphase induction machines. The control objective is to generate a nearly rectangular air–gap flux, resulting in an improved machine power density for t...

In this paper, the torque ripple of consequent-pole PM machines (CPPMMs) is reduced by injecting 2nd order harmonic armature current. into stator coils. proposed method, based on machine back-emf spectrum and main load current, appropriate current obtained. An analytical model developed to obtain CPPMMs. addition, obtained used compute electromagnetic as a function currents. Validity verified u...

This article proposes a modeling approach and an optimization strategy to exploit third-harmonic current injection for the torque enhancement in multiphase isotropic permanent magnet synchronous machines with nonsinusoidal back electromotive forces. The is based on proper vector space decomposition associated rotational transformation, aimed properly select set of stator vectors be controlled. ...