Abstract
This paper investigates the transient recovery voltages across vacuum circuit breakers used for the switching shunt capacitor bank in wind power plants, which are connected to the power system. Consideration has been given to high frequency models of all power system components, such as, the transformer, wind power plant generator, cable, surge arrester, vacuum circuit breaker and grounding system. The initial phase of study reproduced the results of previous work. In the second phase, the influence of different parameters, such as, the grounding system network, current injection point location to the grounding system, soil resistivity, grounding system length segment and soil ionization phenomena in the grounding system on transient recovery voltage, have been investigated via EMTP-RV. The results show that consideration of the high frequency behavior of the grounding system in wind power plants for prediction of transient recovery voltages is very important.
Highlights
The use of wind power plants for energy production is growing and many attempts have been made to improve the reliability of this type of energy production plant through effective grounding systems
This paper has investigated the Transient Recovery Voltages (TRV) across Vacuum Circuit Breaker (VCB) used for capacitor bank switching via modeling of grounding systems in EMTP_RV software
It can be concluded that implementation of a mesh grounding system within wind power plants reduces the TRV across VCBs in capacitor bank switching
Summary
The use of wind power plants for energy production is growing and many attempts have been made to improve the reliability of this type of energy production plant through effective grounding systems. The effects of different capacitor bank structures on transient recovery voltage across power systems’ vacuum circuit breakers has been investigated by Badrzadeh [10] using PSCAD software. In a further investigation Badrzadeh et al [11] report that the stray capacitor of elements plays an important role on the Transient Recovery Voltages (TRV) at high frequencies. The bench mark paper investigates TRV across VCB which is the result of disconnection of capacitor banks to the plant. Part B-III reports the contribution of this paper where the results demonstrate that consideration of the high frequency model of the grounding system will lead to a more accurate prediction of TRV across VCBs for protection of plant equipment. In conjunction with the developed high frequency grounding system model investigated the impact of soil ionization phenomena on TRV magnitude which has previously not been considered
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