scholarly journals Decentralized Smart Grid Voltage Control by Synchronization of Linear Multiagent Systems in the Presence of Time-Varying Latencies

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1470 ◽  
Author(s):  
Amedeo Andreotti ◽  
Bianca Caiazzo ◽  
Alberto Petrillo ◽  
Stefania Santini ◽  
Alfredo Vaccaro
Keyword(s):  
Power Distribution ◽  
Communication Systems ◽  
Cooperative Control ◽  
Distribution Systems ◽  
Robustness Analysis ◽  
Voltage Control ◽  
Test System ◽  
Time Varying ◽  
Power Network ◽  
Distributed Intelligence

Modern power distribution systems require reliable, self-organizing and highly scalable voltage control systems, which should be able to promptly compensate the voltage fluctuations induced by intermittent and non-programmable generators. However, their deployment in realistic operation scenarios is still an open issue due, for example, to the presence of non-ideal and unreliable communication systems that allow each component within the power network to share information about its state. Indeed, due to technological constraints, time-delays in data acquisition and transmission are unavoidable and their effects have to be taken into account in the control design phase. To this aim, in this paper, we propose a fully distributed cooperative control protocol allowing the voltage control to be achieved despite the presence of heterogeneous time-varying latencies. The idea is to exploit the distributed intelligence along the network, so that it is possible to bring out an optimal global behavior via cooperative distributed control action that leverages both local and the outdated information shared among the devices within the power network. Detailed simulation results obtained on the realistic case study of the IEEE 30-bus test system are presented and discussed in order to prove the effectiveness of the proposed approach in the task of solving complex voltage control problems. Finally, a robustness analysis with respect to both loads variations and hard communication delays was also carried to disclose the efficiency of the approach.

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

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.

scholarly journals A Flexible Load Control Strategy for Distribution Network to Reduce the Line Losses and to Eliminate the Transmission Congestion

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Beibei Wang ◽  
Xiaoqing Hu ◽  
Peifeng Shen ◽  
Wenlu Ji ◽  
Yang Cao ◽  
...  
Keyword(s):  
Power Distribution ◽  
Distribution Systems ◽  
Renewable Energy Sources ◽  
Distribution Network ◽  
Test System ◽  
Operating Conditions ◽  
Load Control ◽  
Transmission Congestion ◽  
Heavy Load ◽  
Flexible Load

There are many uncertain factors in the modern distribution network, including the access of renewable energy sources and the heavy load level. The existence of these factors has brought challenges to the stability of the power distribution network, as well as increasing the risk of exceeding transmission capacity of distribution lines. The appearance of flexible load control technology provides a new idea to solve the above problems. Air conditioners (ACs) account for a great proportion of all loads. In this paper, the model of dispatching AC loads in the regional power grid is constructed, and the direct load control (DLC) method is adopted to reduce the load of ACs. An improved tabu search technique is proposed to solve the problem of network dispatch in distribution systems in order to reduce the resistive line losses and to eliminate the transmission congestion in lines under normal operating conditions. The optimal node solution is obtained to find the best location and reduction capacity of ACs for load control. To demonstrate the validity and effectiveness of the proposed method, a test system is studied. The numerical results are also given in this article, which reveal that the proposed method is promising.

A Two-Stage Distributed Architecture for Voltage Control in Power Distribution Systems

2013 ◽  
Vol 28 (2) ◽  
pp. 1470-1482 ◽  
Author(s):  
Brett A. Robbins ◽  
Christoforos N. Hadjicostis ◽  
Alejandro D. Dominguez-Garcia
Keyword(s):  
Power Distribution ◽  
Distribution Systems ◽  
Voltage Control ◽  
Power Distribution Systems ◽  
Distributed Architecture ◽  
Two Stage

Aplicação de Sistema Imunológico Artificial para Alocação Ótima de Medidores com Suporte de Rede Neural Artificial

2021 ◽  
Author(s):  
Thales Schuabb Almeida ◽  
Lucas Eduardo Silva Braga ◽  
Pedro Caruso Fracetti ◽  
Leonardo Willer Oliveira ◽  
Edimar Jose Oliveira ◽  
...  
Keyword(s):  
Power Distribution ◽  
Distribution Systems ◽  
Optimal Allocation ◽  
Test System ◽  
Electrical Network ◽  
Measurement Unit ◽  
Power Distribution Systems ◽  
Heuristic Technique ◽  
Potential Methods

The strategical allocation of meters, such as the Phasor Measurement Unit (PMU), at Power Distribution Systems (PDS), represents an optimization of the use of monitoring resources. This optimization can contribute to the State Estimation (SE) process, which consists of obtaining an estimated electrical network state without full monitoring. Meta-heuristics are potential methods for application to optimal allocation problems, such as meters in PDS. Still, computational intelligence techniques, such as Artificial Neural Networks (ANN), can be applied to SE, due to its agility in processing available measures. Therefore, this work aims to investigate the potential of associating a meta-heuristic technique, Artificial Immunological System (AIS), for the allocation of meters with the processing agility of ANN for the evaluation of different allocation options. A case study using a well-known test system in the area of knowledge demonstrates the applicability of the proposed hybrid method.

scholarly journals Development of an SDBC-MMCC-Based DSTATCOM for Real-Time Single-Phase Load Compensation in Three-Phase Power Distribution Systems

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4705 ◽  
Author(s):  
Wei-Neng Chang ◽  
Ching-Huan Liao
Keyword(s):  
Electric Power ◽  
Power Distribution ◽  
Distribution Systems ◽  
Single Phase ◽  
Test System ◽  
Power Distribution Systems ◽  
Static Synchronous Compensator ◽  
Load Compensation ◽  
Electric Power Distribution ◽  
Three Phase

This paper proposes a newly developed single-delta bridge-cell, modular multilevel cascade converter (SDBC-MMCC)-based distribution-level static synchronous compensator (DSTATCOM) for single-phase load compensation in three-phase, three-wire electric power distribution systems. Each main circuit arm of the DSTATCOM uses a modular multilevel cascade converter based on full-H-bridge (FHB) cells. The three main DSTATCOM arms are delta-connected to allow phase-independent operations for phase balancing and unity power factor correction of the single-phase load in three-phase, three-wire electric power distribution systems. By using the symmetrical components method, a feedforward compensation algorithm was employed for the DSTATCOM. A simulation of the DSTATCOM was performed for functioning verification. Finally, a hardware test system was built by using a multi-DSP-based control system. The test results verified the effectiveness of the proposed SDBC-MMCC-based DSTATCOM in single-phase load compensation.

Pareto Optimal Reconfiguration of Power Distribution Systems with Load Uncertainty and Recloser Placement Simultaneousely Using a Genetic Algorithm Based on NSGA-II

2016 ◽  
Vol 1 (3) ◽  
pp. 419
Author(s):  
Sina Khajeh Ahmad Attari ◽  
Mahmoud reza Shakarami ◽  
Farhad Namdari
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Test System ◽  
Simultaneous Optimization ◽  
Transient Faults ◽  
Nsga Ii ◽  
Load Uncertainty ◽  
Operational Conditions ◽  
Power Loss Reduction

<em><span>Reconfiguration, by exchanging the functional links between the elements of the system, represents one of the most important measures which can improve the operational performance of a distribution system. Besides, reclosers use to eliminate transient faults, faults isolation, network management and enhance reliability to reduce customer outages. For load uncertainty a new method based on probabilistic interval arithmetic approach is used to incorporate uncertainty in load demand that can forecast reasonably accurate operational conditions of radial system distribution (RDS) with better computational efficiency.<strong> </strong>In this paper, the optimization process is performed by considering power loss reduction along with reliability index as objective functions. Simulation results on radial 33 buses test system indicates that simultaneous optimization of these two issues has significant impact on system performance.</span></em>

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