The supply territory of the company E.ON Distribution in the Czech Republic (run by the company E.ON Czech Republic) accounts for approximately 1.5 million customers. More than 900MW of photovoltaic (PV) plants were connected to this distribution grid. It was detected the problem with overvoltage in approximately 20% low voltage distribution grids with connected PV plants and this problem has t...

Overvoltage is one of the issues in distribution grids with high penetration photovoltaics (PVs). Centralized or droop-based methods active power curtailment (APC) and/or reactive control PVs are viable solutions to prevent overvoltage. This article proposes two distributed PV inverters, which based on nodal sensitivities. Then, performance proposed compared commonly used methods, i.e., a metho...

The ever-increasing penetration levels of converter-based distributed energy resources (DERs) in medium and low voltage (MV/LV) distribution networks necessitates new revised standards or connection requirements generating units. These standardized to be met by DERs are called grid codes. This paper reviews European IEEE codes MV/LV presents an evaluation selected applicable for AC microgrid pr...

The continuous operation of 1000 MW large hydro generators in China is great value to the implementation “double carbon strategy” and power grid safety. However, with increase single unit capacity generator, problems fault grounding current neutral point voltage drift become more prominent, traditional analysis methods cannot accurately obtain dynamic data. Therefore, starting from mode taking ...

This paper proposes a systematic and deterministic method for metal-oxide varistor (MOV) surge arrester selection based on the comprehensive analysis in line-commutated converter (LCC)-based high-voltage direct current (HVDC) transmission systems. For MOV arrester, this investigates several significant impacts transient overvoltage (TOV) phenomena, which is affected by practical factors such as...

Abstract In this work, the non-liner voltage distribution in transformer winding is investigated that occurs due switching and lightning. Transformer winding is modeled in the alternative transients program (ATP) version of Electromagnetic transients program (EMTPRV). EMTP software is used to simulate the very fast transient overvoltage. An experimental setup that consist of , Recurrent surge g...

This paper describes methodology for the computation of the electromagnetic transients in the high voltage substations, taking into account transients on the substation grounding system. Simulation technology is based on the system decomposition. Interconnections between different subsystems are done in each time step using Thevenin equivalents. Frequency dependent impedance of grounding conduc...