Mitigating the Adverse Impact of Un-Deterministic Distributed Generation on a Distribution System Considering Voltage Profile

Electric power systems are enforced to operate near to their stability limit due to the fast increase in power demand. Therefore, voltage stability has become a primary concern. The main cause of voltage variations is the imbalance between generation and consumption. In order to mitigate variations in voltage profile, most of the modern electric power systems are adopting new emerging technologies such as distributed generation. Validation of standard voltage optimization is a difficult task when distributed generation is integrated to medium and low voltage networks. Integration of distributed generation (DG) will have diverse impacts on voltage levels when connected un-deterministically to the electric distribution system. This paper analyzes both the impacts of un-deterministic large and small size DG on voltage profile. Feasible solutions by incorporating reactors and increasing cross sectional area of cables, variation in voltage profile were mitigated. Detailed simulations were performed in ETAP by modeling and evaluating Kohat road grid station situated in Peshawar, Pakistan. The results anticipated that this approach can be useful to ensure standard voltage profile and better utilization of un-deterministic DG units.

Download Full-text

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

Energies ◽

10.3390/en14061688 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1688 ◽

Cited By ~ 1

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.

Download Full-text

Improved low voltage solution calculation method for voltage stability assessment of electric power systems

2000 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.00CH37077) ◽

10.1109/pesw.2000.850114 ◽

2002 ◽

Author(s):

C.A. Castro

Keyword(s):

Power Systems ◽

Electric Power ◽

Calculation Method ◽

Voltage Stability ◽

Low Voltage ◽

Electric Power Systems ◽

Stability Assessment

Download Full-text

Impacts of Photovoltaic Distributed Generation Location and Size on Distribution Power System Network

International Journal of Power Electronics and Drive Systems (IJPEDS) ◽

10.11591/ijpeds.v9.i2.pp905-913 ◽

2018 ◽

Vol 9 (2) ◽

pp. 905 ◽

Cited By ~ 3

Author(s):

N. Md. Saad ◽

M. Z. Sujod ◽

Lee Hui Ming ◽

M. F. Abas ◽

M. S. Jadin ◽

...

Keyword(s):

Power Systems ◽

Distributed Generation ◽

Distribution System ◽

Short Circuit ◽

Rapid Development ◽

Reducing Power ◽

Load Flow ◽

Voltage Profile ◽

Power Losses ◽

Distribution Grid

As the rapid development of photovoltaic (PV) technology in recent years with the growth of electricity demand, integration of photovoltaic distributed generation (PVDG) to the distribution system is emerging to fulfil the demand. There are benefits and drawbacks to the distribution system due to the penetration of PVDG. This paper discussed and investigated the impacts of PVDG location and size on distribution power systems. The medium voltage distribution network is connected to the grid with the load being supplied by PVDG. Load flow and short circuit calculation are analyzed by using DigSILENT Power Factory Software. Comparisons have been made between the typical distribution system and the distribution system with the penetration of PVDG. Impacts in which PVDG location and size integrates with distribution system are investigated with the results given from the load flow and short circuit analysis. The results indicate positive impacts on the system interconnected with PVDG such as improving voltage profile, reducing power losses, releasing transmission and distribution grid capacity. It also shows that optimal locations and sizes of DGs are needed to minimize the system’s power losses. On the other hand, it shows that PVDG interconnection to the system can cause reverse power flow at improper DG size and location and increases short circuit level.

Download Full-text