One of the difficulties with PWM switching converters is high switching loss and electromagnetic interference due to switching at non-zero voltage and current, which limits the operating frequency. In order to reduce the converter volume and weight (by increasing the frequency) and reducing switching losses, zero voltage and current switching methods are recommended. In this paper, four main ze...

Overvoltage is becoming increasingly prevalent in distribution networks with high penetration of renewable distributed energy sources (DERs). Local control converter-based resources a flexible and scalable method to prevent this growing issue. Reactive power used for voltage many local schemes. However, the typical range R/X ratios lines indicates that mitigation overvoltage often requires exce...

The increasing usage of hybrid cable-overhead lines raises concerns over the protection short cable sections against lightning surges, because voltage build-up in section. To set a simulation model phenomenon is time consuming, with numerous parameters impacting overvoltage. This paper (Part I) presents formulas able to perform fast estimation maximum overvoltage at line transition point event ...

The roof arrester of electric multiple units (EMU) can efficiently limit the overvoltage, and ensure safe operation EMU electrical equipment. In process high-speed operation, traction power supply system is often affected by overvoltage. addition, explosion accidents occasionally occur. this paper, on-line voltage measurement developed. By analysing a large number waveforms, abnormal divided in...

The accurate identification of Very Fast Transient Overvoltage (VFTO) is the key overvoltage control in modern smart grids. In order to accurately identify VFTO generated by operation a disconnector Gas Insulated Substation (GIS), method based on Wavelet Transform (WT) and Singular Value Decomposition (SVD) proposed. simulation model established ATP-EMTP software first, then wavelet decompositi...

The switching operation of gas insulated switchgear (GIS) disconnector will produce multiple random spark discharges between the gaps disconnector. Each discharge can be affected by various factors, such as trapped charge on load side, initial operating phase, gap distance and speed disconnector, leading to dispersion characteristics. At present, some studies have mentioned this dispersion, but...