Hierarchical reactive power regulation strategies for high-penetration photovoltaic distribution systems

Allocation of the power losses to distributed generators and consumers has been a challenging concern for decades in restructured power systems. This paper proposes a promising approach for loss allocation in power distribution systems based on a cooperative concept of game-theory, named Shapley Value allocation. The proposed solution is a generic approach, applicable to both radial and meshed distribution systems as well as those with high penetration of renewables and DG units. With several different methods for distribution system loss allocation, the suggested method has been shown to be a straight-forward and efficient criterion for performance comparisons. The suggested loss allocation approach is numerically investigated, the results of which are presented for two distribution systems and its performance is compared with those obtained by other methodologies.

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Optimal Sizing and Placement of Capacitor Banks in Distribution Networks Using a Genetic Algorithm

Electricity ◽

10.3390/electricity2020012 ◽

2021 ◽

Vol 2 (2) ◽

pp. 187-204

Author(s):

Gian Giuseppe Soma

Keyword(s):

Genetic Algorithm ◽

Electricity Market ◽

Distribution Systems ◽

Reactive Power ◽

Electricity Consumption ◽

Distribution Networks ◽

Optimal Placement ◽

Capacitor Banks ◽

Control Pattern ◽

Definition Of

Nowadays, response to electricity consumption growth is mainly supported by efficiency; therefore, this is the new main goal in the development of electric distribution networks, which must fully comply with the system’s constraints. In recent decades, the issue of independent reactive power services, including the optimal placement of capacitors in the grid due to the restructuring of the electricity industry and the creation of a competitive electricity market, has received attention from related companies. In this context, a genetic algorithm is proposed for optimal planning of capacitor banks. A case study derived from a real network, considering the application of suitable daily profiles for loads and generators, to obtain a better representation of the electrical conditions, is discussed in the present paper. The results confirmed that some placement solutions can be obtained with a good compromise between costs and benefits; the adopted benefits are energy losses and power factor infringements, taking into account the network technical limits. The feasibility and effectiveness of the proposed algorithm for optimal placement and sizing of capacitor banks in distribution systems, with the definition of a suitable control pattern, have been proved.

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Electric Vehicles in Jordan: Challenges and Limitations

Sustainability ◽

10.3390/su13063199 ◽

2021 ◽

Vol 13 (6) ◽

pp. 3199

Author(s):

Laith Shalalfeh ◽

Ashraf AlShalalfeh ◽

Khaled Alkaradsheh ◽

Mahmoud Alhamarneh ◽

Ahmad Bashaireh

Keyword(s):

Electric Vehicles ◽

Distribution System ◽

Distribution Systems ◽

Environmental Benefits ◽

System Stability ◽

Loading Conditions ◽

Stability Margins ◽

High Penetration ◽

Node Distribution ◽

The Impact

An increasing number of electric vehicles (EVs) are replacing gasoline vehicles in the automobile market due to the economic and environmental benefits. The high penetration of EVs is one of the main challenges in the future smart grid. As a result of EV charging, an excessive overloading is expected in different elements of the power system, especially at the distribution level. In this paper, we evaluate the impact of EVs on the distribution system under three loading conditions (light, intermediate, and full). For each case, we estimate the maximum number of EVs that can be charged simultaneously before reaching different system limitations, including the undervoltage, overcurrent, and transformer capacity limit. Finally, we use the 19-node distribution system to study these limitations under different loading conditions. The 19-node system is one of the typical distribution systems in Jordan. Our work estimates the upper limit of the possible EV penetration before reaching the system stability margins.

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Optimal fault location for power distribution systems with distributed generations using synchronized measurements

International Journal of Emerging Electric Power Systems ◽

10.1515/ijeeps-2020-0093 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Wen Fan ◽

Yuan Liao ◽

Ning kang

Keyword(s):

Power Distribution ◽

Distribution Systems ◽

Fault Location ◽

Test System ◽

Power Distribution Systems ◽

Distributed Generations ◽

High Penetration ◽

Maintenance Time ◽

Phasor Measurements ◽

Synchronized Measurements

AbstractAccurate fault location in distribution systems greatly shortens maintenance time and improves reliability. This paper presents novel methods to pinpoint fault location and identify possible bad measurements for enhanced accuracy. It is assumed that network parameters and topology of the distribution network are available. The methods are applicable to a single fault as well as simultaneous faults and are applicable to both balanced and unbalanced networks. The methods utilize synchronized voltage and current phasor measurements to locate the fault. The methods are validated by simulation studies using the modified IEEE 34-Node Test System. Case studies have demonstrated that the methods are suitable for distribution systems with high penetration of distributed generations.

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