Temporary overvoltage (TOV) is becoming one challenge for the integration of significant power electronics resources into a system. To assess risk TOV in Multi-Infeed Power Electronic System (MIPES), worst-case estimation approach proposed to risk. The paper starts with analyzing mechanism TOV, which reveals that dominated by excessive reactive resulting from comprehensive control laggings. The...

─ This paper presents a voltage doubler in to a half bridge converter is derived for electric vehicle battery chargers. The proposed converter provides wide ZVS range, reduced circulating current and also voltage stress. Circulating current during the freewheeling phases of phase shift full bridge circuit are reset by the sum of LLC circuit output voltage and resonant capacitor voltage by achie...

The boost converter is widely used in applications of regulation of voltage and active power factor correction (PFC), its correct operation and final performance directly are related to the design of its closed loop control. The design of its loop control is quite complex due to the non-linearity of its behavior, the commutation of a switch (power transistor) makes its equivalent circuit to cha...

In order to use hydrogen fuel cells in domestic applications either as main power supply or backup source, their low DC output voltage has to be matched to the level and frequency of the utility grid AC voltage. Such power converter systems usually consist of a DC-DC converter and a DCAC inverter. A double inductor step-up push-pull converter with the output voltage and the input current contro...

The recent rapid uptake of residential solar photovoltaic (PV) installations provides many challenges for electricity distribution networks designed for one-way power flow from the distribution company to the residential customer. In particular, for grid-connected installations, intermittent generation as well as large amounts of generation during low load periods can lead to a degradation of p...

In a power system, a contingency refers to an outage of power system components such as transformers, generators, lines, etc. due to faults or failure. A contingency could lead to voltage and power flow problems. This paper describes practical contingency studies based on a real power system provided by a utility. The aim of this study is to find out contingencies that cause undervoltage, overv...

Photovoltaic energy is one of the fastest growing renewable energy sources in the worldand as the issue of energy security is becoming more and more important it could be a promising option. But as photovoltaic energy is becoming widespread and penetration level of photovoltaic power plants increase, issues rise in distribution networks.In this paper a power control scheme for a high penetratio...

For development of a UHV transmission system, sophisticated system design is indispensable to deal with increased charging MVA and higher transmission voltage. Furthermore, for realization of technical and economical optimization throughout the design of the transmission line and the substation, solutions for network problems specific to UHV AC transmission system and problems with insulation c...

Diffuse electron-beam ionized discharges break down into arc discharges under three different conditions: static (no discharge orE-beam), dynamic (discharge on) and pulsed (inductive) overvoltage at switch-off. Dynamic breakdown voltages are lower than static breakdown voltages but in normal operation the discharge "on" voltage is kept to a minimum. The maximum load voltage will only be present...