Nowadays increasing attention turns to the harmonic penetration analysis of the alternating voltage network connected devices operating with pulse width modulation (PWM). The PWM operation causes high frequency current injection to the grid (at the frequency range: 1kHz to 100kHz, depending on the power and the structure of the device). However, devices are now rolling out, that are infected by...

OBJECTIVE To assess the potential of intravenous Optison, a second generation ultrasound contrast agent, and various ultrasound imaging modes to determine myocardial, kidney, and liver perfusion in normal subjects and patients with left ventricular dysfunction or chronic pulmonary disease together with renal or hepatic dysfunction. METHODS Five normal subjects and 20 patients underwent grey s...

This paper discusses how an Active Power Filter (APF) can be utilized for system-wide harmonic mitigation in a microgrid with multiple sources of harmonic distortion located at different buses. A two-bus microgrid system with independent nonlinear loads at both buses is first investigated analytically, and it is demonstrated that it is possible to derive a harmonic current injection from the AP...

Today, the presence of disturbing loads in low, medium and also directly in high voltage networks is producing a growing presence of harmonics and unbalance in transmission levels. Economic reasons difficult the installation of harmonic measurement devices in all the buses of the system. Instead, it would be possible to install harmonic measurement equipment in selected buses, in a fraction of ...

The high penetration of inverter-based distributed generations (IBDGs) leads to traditional distribution networks’ complex and variable fault characteristics. Traditional passive detection protection methods can hardly meet the stability reliability requirements. To solve this problem, an injection harmonic current differential (IHCDP) scheme based on idea control-protection synergy is proposed...

this paper presents a novel control approach used in shunt active power filter based on variable structure control combined with random pwm technique (rvsc) that provides robust, fast, and more favorable performance for active power filter. this control strategy is compared with two other strategies to show the effectiveness of the introduced methods; pulse width modulated proportional-integral...

A 17.8–34.8 GHz (64.6%) locking range current-reuse injection-locked frequency multiplier (CR-ILFM) with dual injection technique is presented in this paper. applied to generate differential signal and increase the power of second-order harmonic component. The CR core proposed reduce consumption compatibility NMOS PMOS injectors. inductor-capacitor (LC) tank CR-ILFM designed a fourth-order reso...