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Reference: ISH2015_29

Type:
ISH Collection
Title:

Vacuum circuit breaker switching in photovoltaic power plants - investigation on transient overvoltages

 

Abstracts

The goal of the work presented in this article is to investigate transient overvoltages that can occur during vacuum circuit breaker (VCB) opening operation on a grid connected photovoltaic (PV) power plant. Breaking of several amps of current using a vacuum interrupter can lead to generation of multiple arc re-strikes, which at certain network topologies can be hazardous in terms of high overvoltage peak values and significant voltage steepness. Extensive studies of transient overvoltages in these topologies are required due to the fact that the transient response of the de-energized compartment is dependent not only from medium voltage side components, but also from the low voltage ones. This is a result of the fact that PV panels generate DC voltage and current that have to be converted by means of DC/AC inverters. They are usually equipped with LC or LCL output filters influencing the impedance of the switched of circuit. This paper presents studies of transformer de-energization for different PV generation currents and LC filters topologies. PSCAD v4.5 software was used for studies.
 

File Size: 156 KB

Year: 2015

 
 
 
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