In this paper, droop control of inverters in a multi-terminal HVDC (MTDC) system is designed to achieve minimum DC system loss while preventing converter overvoltage. Circuit analysis along with optimization analysis is first conducted to seek the optimal droop control gains. Contingent operating conditions are then considered. The droop control gains will adapt to achieve minimum loss as well ...

This paper presents a time-sequential simulation technique incorporating the effects of interruptions and voltage sags in the reliability cost/worth evaluation of distribution systems equipped with different overvoltage protection types. The interruption and voltage sag data for different overvoltage protection schemes was obtained from long-term measurements performed at a 110/20 kV substation...

This paper presents the determination of insulation coordination for phase-to-ground switching over voltages by a practical method in which effect overvoltage waveshape, especially impact time to crest on strength is considered. work carried out world’s first 1200 kV transmission line modelling it PSCAD.

The power converter that feeds high-frequency, highvoltage transformers must be carefully designed due to parasitic components, mainly the secondary winding capacitance and the leakage inductance, that introduces resonances in relatively lowfrequency range, next to the switching frequency. This paper considers applications in which the load (resistive) has an unpredictable behavior, changing fr...

In this paper studies of overvoltage and capacitance measurements at silver cathodes in aqueous perchloric acid at room temperature are described. Capacitances were deduced from open-circuit potential decay measurements. The increase of overvoltage and the growth of the measured capacitances in the course of electrolysis are attributed to a growing pseudocapacitance component. This is anal...

Residential rooftop-mounted solar photovoltaic (PV) panels are being installed at an increasing rate, both in New Zealand and globally. There have been concerns over possible issues such as overvoltage and overcurrent. These PV systems are mostly connected at low voltage (LV). This study presents a case study of simulating the entire LV network from a single utility, comprising 10,558 11 kV–415...

The emergence of fast-switching wide-bandgap (GaN, SiC) power electronics devices has enabled motor drive systems to achieve high efficiency, density, control bandwidth and high-level integration. However, the speed switching frequency result in an increased level overvoltage at both terminals stator neutral. This increases stress across winding insulation bearings. paper investigates three typ...

In this paper, a broadband circuit model of a potential transformer (PT) based on fractional calculus and circuit augmentation method is proposed to improve the high frequency characteristic while providing physical significance of existing traditional equivalent circuit model with simple structure. In order to reflect the characteristics of the hysteresis of the iron core roundly, a fractional...