Under the current trend of power electronics in energy systems, a high percentage renewable transports clean to grid through grid-connected inverters. The pulse-width modulation (PWM) technique brings high-order harmonics near switching frequency, and LCL filters with low-pass characteristics become common choice for However, low-order caused by nonideal are difficult filter out, new resonance ...

An electric spring (ES) with series connection to non-critical loads (NCLs) is mainly known as a smart load (SL) technology that can compensate undervoltages and overvoltages. In this paper, an improved control method presented for the regulate effective value of critical (CL) voltage nominal harmonics caused by grid side. The spring’s performance simultaneous magnitude regulation harmonic dist...

The purpose of this work is to determine the appropriate allocation a single tuned passive filter “STPF” in real distribution network at Tala city prevent harmonic distortion caused by nonlinear loads. This design will cover ideal parameter as well best position. based on and multi-objective functions that optimize cost proposed filters, power losses, total “THD,” individual “IHD”. Upper lower ...

Nowadays with increasing use of numerous nonlinear loads, voltage and current harmonics in power systems are one of the most important problems power engineers encounter. Many of these nonlinear loads, because of their dynamic natures, inject time-varying harmonics into power system. Common techniques applied for harmonics measurement and assessment such as FFT have significant errors in presen...

In this contribution, some possible effects of large band electromagnetic interferences on Ground Penetrating Radar (GPR) data are shown, and a possible way to counteract them is shown, too. The mitigation of the interferences is implemented thanks to a prototypal reconfigurable stepped frequency GPR system, that allows to program the integration time of the harmonic tones vs. the frequency. In...

The ratio of torque to copper loss can be increased by injecting third-harmonic current into five-phase permanent-magnetic synchronous motor (PMSM). Accurate flux linkage information is indispensable in the process calculating reference corresponding maximum torque/copper ratio. In harsh working environments, will deviate from initial measured value, resulting deviation between and point. There...

Thyristor rectifiers are widely used in electric railways in order to control the speed. As a consequence of their usage in addition to substantial input lead current, an enormous amount of harmonics is injected into the grid. To avoid such harmonics as well as reactive power compensation, reactive power hybrid filters consisting of active and passive filters are utilized. Regarding different p...

Background and Objectives: Despite superior privileges that multiphase motors offer in comparison with their three-phase counterparts, in the field of multiphase linear induction motors (LIMs) few studies have been reported until now. To combine the advantages of both multiphase motors and linear induction motors, this paper concentrates on multiphase LIM drives considering the end effects. Met...

A novel current injection network for low-harmonic rectifiers that apply the third harmonic current injection is proposed in this letter. The current injection network requires one inductor, two capacitors, and one 1 : 1 transformer with voltampere rating of only 0.16% of the input power. The transformer is introduced to provide complete rejection of harmonic components of the injected currents...