scholarly journals Fault Analysis Method for Power Distribution Grid with PCS-based Distributed Energy Resources

2017 ◽  
Vol 12 (2) ◽  
pp. 522-532 ◽  
Author(s):  
Dong-Eok Kim ◽  
Namhun Cho
Keyword(s):  
Power Distribution ◽  
Fault Analysis ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Analysis Method ◽  
Distribution Grid ◽  
Distributed Energy

scholarly journals A Horizon Optimization Control Framework for the Coordinated Operation of Multiple Distributed Energy Resources in Low Voltage Distribution Networks

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1182 ◽  
Author(s):  
Konstantinos Kotsalos ◽  
Ismael Miranda ◽  
Nuno Silva ◽  
Helder Leite
Keyword(s):  
Optimal Power Flow ◽  
Low Voltage ◽  
Distribution Networks ◽  
Heat Pumps ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Distribution Grid ◽  
Distributed Energy ◽  
Control Framework ◽  
Optimization Control

In recent years, the installation of residential Distributed Energy Resources (DER) that produce (mainly rooftop photovoltaics usually bundled with battery system) or consume (electric heat pumps, controllable loads, electric vehicles) electric power is continuously increasing in Low Voltage (LV) distribution networks. Several technical challenges may arise through the massive integration of DER, which have to be addressed by the distribution grid operator. However, DER can provide certain degree of flexibility to the operation of distribution grids, which is generally performed with temporal shifting of energy to be consumed or injected. This work advances a horizon optimization control framework which aims to efficiently schedule the LV network’s operation in day-ahead scale coordinating multiple DER. The main objectives of the proposed control is to ensure secure LV grid operation in the sense of admissible voltage bounds and rated loading conditions for the secondary transformer. The proposed methodology leans on a multi-period three-phase Optimal Power Flow (OPF) addressed as a nonlinear optimization problem. The resulting horizon control scheme is validated within an LV distribution network through multiple case scenarios with high microgeneration and electric vehicle integration providing admissible voltage limits and avoiding unnecessary active power curtailments.

Improving Power Quality in Low-Voltage Networks Containing Distributed Energy Resources

2013 ◽  
Vol 14 (1) ◽  
pp. 67-78 ◽  
Author(s):  
Sumit Mazumder ◽  
Arindam Ghosh ◽  
Firuz Zare
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution System ◽  
Low Voltage ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Distributed Energy ◽  
Power Distribution System ◽  
Computer Simulation Studies ◽  
Excess Power

Abstract Severe power quality problems can arise when a large number of single-phase distributed energy resources (DERs) are connected to a low-voltage power distribution system. Due to the random location and size of DERs, it may so happen that a particular phase generates excess power than its load demand. In such an event, the excess power will be fed back to the distribution substation and will eventually find its way to the transmission network, causing undesirable voltage–current unbalance. As a solution to this problem, the article proposes the use of a distribution static compensator (DSTATCOM), which regulates voltage at the point of common coupling (PCC), thereby ensuring balanced current flow from and to the distribution substation. Additionally, this device can also support the distribution network in the absence of the utility connection, making the distribution system work as a microgrid. The proposals are validated through extensive digital computer simulation studies using PSCADTM.

Harmonic Impact Study for Distributed Energy Resources Integrated Into Power Distribution Networks

2013 ◽  
Author(s):  
Reza Arghandeh ◽  
Ahmet Onen ◽  
Jaesung Jung ◽  
Danling Cheng ◽  
Robert Broadwater ◽  
...  
Keyword(s):  
Power Distribution ◽  
Power Flow ◽  
Flow Analysis ◽  
Distribution Networks ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Steady Increase ◽  
Distributed Energy ◽  
Network Efficiency ◽  
The Impact

Smart realization involves a steady increase in inverter-based components like Distributed Energy Resources (DER), energy storage systems, and plug-in electric vehicles. The harmonics related to DER inverters and the spread of power electronic devices raises concerns for utilities and customers. Harmonics can create component failures, thermal losses and control system malfunctions. In this paper the authors analyze the impact of multi-source harmonics from DERs inside distribution networks. The harmonics impacts are evaluated by harmonic measurement indices. Harmonic emission in a real distribution circuit is simulated with the help of power flow analysis. The results are presented with visualization techniques to give a better picture of harmonic propagation vs. different levels of harmonic source magnitude and angle. Due to effect of harmonic on network efficiency, a sensitivity analysis considering power factors is conducted.

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