On the Unstable Equilibrium Points and System Separations in Electric Power Systems: A Numerical Study

2015 ◽  
pp. 103-122 ◽  
Author(s):  
Jinda Cui ◽  
Hsiao-Dong Chiang ◽  
Tao Wang
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
Numerical Study ◽  
Equilibrium Points ◽  
Electric Power Systems ◽  
Unstable Equilibrium

Computation of multi-parameter sensitivities of equilibrium points in electric power systems

2013 ◽  
Vol 96 ◽  
pp. 246-254 ◽  
Author(s):  
Enrique A. Zamora-Cárdenas ◽  
Claudio R. Fuerte-Esquivel
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
Equilibrium Points ◽  
Electric Power Systems

scholarly journals Uncontrolled Electric Vehicle Charging Impacts on Distribution Electric Power Systems with Primarily Residential, Commercial or Industrial Loads

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1688 ◽  
Author(s):  
C. Birk Jones ◽  
Matthew Lave ◽  
William Vining ◽  
Brooke Marshall Garcia
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
Low Voltage ◽  
Peak Load ◽  
Electric Power Systems ◽  
Primary System ◽  
Maximum Increase ◽  
Actual Distribution ◽  
The Impact ◽  
Ev Charging

An increase in Electric Vehicles (EV) will result in higher demands on the distribution electric power systems (EPS) which may result in thermal line overloading and low voltage violations. To understand the impact, this work simulates two EV charging scenarios (home- and work-dominant) under potential 2030 EV adoption levels on 10 actual distribution feeders that support residential, commercial, and industrial loads. The simulations include actual driving patterns of existing (non-EV) vehicles taken from global positioning system (GPS) data. The GPS driving behaviors, which explain the spatial and temporal EV charging demands, provide information on each vehicles travel distance, dwell locations, and dwell durations. Then, the EPS simulations incorporate the EV charging demands to calculate the power flow across the feeder. Simulation results show that voltage impacts are modest (less than 0.01 p.u.), likely due to robust feeder designs and the models only represent the high-voltage (“primary”) system components. Line loading impacts are more noticeable, with a maximum increase of about 15%. Additionally, the feeder peak load times experience a slight shift for residential and mixed feeders (≈1 h), not at all for the industrial, and 8 h for the commercial feeder.

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