This paper investigates an improved control strategy for a doubly-fed induction generator (DFIG) based wind-power generation system with series grid-side converter (SGSC) under network unbalance and harmonic grid voltage distortion conditions. The integrated mathematical modeling of the DFIG system with SGSC is established by taking both the negative-sequence and harmonic components of the grid...

With the development of critical loads, power quality problem has become particularly important and poor power quality will be cause many adverse effects and the cost of many deaths will follow. To improve power quality and protection of sensitive loads against grid disturbances have been used new equipment based on power electronics similar FACTs devices, they are Custom Power. One of the most...

Voltage sags are normally described by magnitude variation and duration. In addition to these quantities, sags are also characterized by unbalance (asymmetry), nonsinusoidal waveshapes, and phase angle shift (phase jump). These factors are important for determining the behavior of ac motor drives during sags. Voltage unbalance and phase angle shifts cause large unbalanced source currents to, ex...

Availability of quality power has become an important issue for industrial utilities due to frequent performance variations in process industries. Increase in the generating capacity has not kept up pace of power demand, which results into shortage of power supply and power system network is normally subjected to varying and unequal loads across the three phases. Continuous variation of single-...

The phenomenon of imbalance is a variation voltage and current waveforms from perfect sinusoidal waveform, which considered crucial challenge in power systems. Uneven loads disturbances result three-phase voltage/current unbalance that leads to temperature rise low output curves at synchronous machines. Thus, the unbalance/fault must be recognized avoided. This article suggests methodology dete...

This paper shows how a high penetration of PV generation in LV distribution networks can generate voltage problems, such as voltage rise and voltage unbalance. High resolution solar irradiance data from representative days is used in a network model along with real demand profiles. To reduce the voltage problems, excess power from PV sources need to be managed. A lab based battery energy storag...

This paper proposes two control algorithms to solve the three-phase power unbalance problem in Scott transformer based grid, and are power-based current-based compensation method. The method uses active/reactive at load side for control, utilizes secondary current directly eliminate an effect of loss through supply chain. In addition, voltage notch generated by low switching frequency weak grid...

Abstract At present, the voltage level of a commercial SiC MOSFET can hardly meet requirements high-voltage field. For sake achieving application MOSFETs in fields, method series-connected has become practical and effective solution. However, multiple face problem unbalance, especially dynamic unbalance. Generally, unbalance could be solved using load side sharing schemes or methods gate side. ...

Unbalance in magnetically levitated rotor (MLR) can cause undesirable synchronous vibrations and lead to the saturation of the magnetic actuator. Dynamic balancing is an important way to solve these problems. However, the traditional balancing methods, using rotor displacement to estimate a rotor’s unbalance, requiring several trial-runs, are neither precise nor efficient. This paper presents a...

Non-linear loads are commonly present in industrial facilities, service facilities, office build‐ ings, and even in our homes. They are the source of several Power Quality problems such as harmonics, reactive power, flicker and resonance [1-3]. Therefore, it can be observed an in‐ creasing deterioration of the electrical power grid voltage and current waveforms, mainly due to the contamination ...