Impact of Voltage Reduction on Voltage Stability in Emergency Conditions

Ahn, Seon-Ju; Yoo, Dong-Hyun; Choi, Joon-Ho

doi:10.14257/ijca.2014.7.4.07

Cited by 5 publications

(1 citation statement)

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“…There is one paper that reports that CVR improves the voltage stability of the system [9], but it does not consider any distribution system model in this study. Our previous work published in reference [10] on CVR impact on VSM with aggregated and de-aggregated load shows that for the aggregated load case, i.e., only with transmission system analysis, CVR increases load margin by 1.835% (similar to [9]) whereas, for the same with de-aggregated load, the increase in margin due to CVR is reduced to 0.399%. Reference [10] suggests using T&D co-simulation to accurately understand the true impact of CVR on VSM.…”

Section: B Cvr and Long-term Voltage Stabilitymentioning

confidence: 99%

Investigation of Relevant Distribution System Representation With DG for Voltage Stability Margin Assessment

Bharati

Ajjarapu

2020

IEEE Trans. Power Syst.

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This paper analyses the impact of conservation by voltage reduction (CVR) on voltage stability margin (VSM) considering transmission and distribution (T&D) systems. VSM is determined by P-V curve analysis using PSSE and GridLAB-D solvers to co-simulate the T&D systems under CVR and No CVR conditions. ZIP loads with profile [ZIP] = [0.4 0.3 0.3] are used to model the load. The paper discusses the counterintuitive result:under CVR, the VSM is reduced. Theoretical justification for the reduced VSM under CVR is the increase in the effective impedance between generation and load and this is proved using an extended 2-bus system. The paper shares T&D co-simulation results with IEEE 9-bus transmission system and a larger 123-bus distribution system and with distributed generation (DG) in unity power factor (UPF) and volt-VAR control (VVC) mode.

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