scholarly journals Optimal dispatch of reactive power for voltage regulation and balancing in unbalanced distribution systems

2016 ◽  
Author(s):  
Daniel B. Arnold ◽  
Michael Sankur ◽  
Roel Dobbe ◽  
Kyle Brady ◽  
Duncan S. Callaway ◽  
...  
Keyword(s):  
Distribution Systems ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Optimal Dispatch

scholarly journals Novel Approach For Minimal Injected Harmonics At Distribution Level – Svc

2011 ◽  
pp. 90-94
Author(s):  
V. Lakshmi Devi ◽  
T. Phanindra
Keyword(s):  
Power Factor ◽  
Distribution System ◽  
Distribution Systems ◽  
Reactive Power ◽  
Low Cost ◽  
Harmonic Distortion ◽  
Voltage Regulation ◽  
Novel Approach ◽  
Artificial Neural Network Ann ◽  
The Cost

Electrical distribution system suffers from various problems like reactive power burden, unbalanced loading, voltage regulation and harmonic distortion. Though DSTATCOMS are ideal solutions for such systems, they are not popular because of the cost and complexity of control involved. Phase wise balanced reactive power compensations are required for fast changing loads needing dynamic power factor correcting devices leading to terminal voltage stabilization. Static Var Compensators (SVCs) remain ideal choice for such loads in practice due to low cost and simple control strategy. These SVCs, while correcting power factor, inject harmonics into the lines causing serious concerns about quality of the distribution line supplies at PCC. This paper proposes to minimize the harmonics injected into the distribution systems by the operation of TSC-TCR type SVC used in conjunction with fast changing loads at LV distribution level. Fuzzy logic system and ANN are going to be used solve this nonlinear problem, giving optimum triggering delay angles used to trigger switches in TCR. The scheme with Artificial Neural Network (ANN) is attractive and can be used at distribution level where load harmonics are within limits. Verification of the system and by using mat lab / simulink with proper modeling.

scholarly journals Design and Implementation of Novel Multi-Converter-Based Unified Power Quality Conditioner for Low-Voltage High-Current Distribution System

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3150 ◽  
Author(s):  
Bin Yang ◽  
Kangli Liu ◽  
Sen Zhang ◽  
Jianfeng Zhao
Keyword(s):  
Power Quality ◽  
Current Distribution ◽  
Distribution Systems ◽  
Reactive Power ◽  
Low Voltage ◽  
Voltage Regulation ◽  
Control Algorithms ◽  
High Current ◽  
Unified Power Quality Conditioner ◽  
Power Quality Conditioner

This paper introduces a novel multi-converter-based unified power quality conditioner (MCB-UPQC). Three optimization methods are proposed based on the traditional UPQC: (1) The shunt converter is substituted with multi-modular parallel converters. Hence, the reactive power and harmonic currents can be increased greatly, which are suitable for low-voltage high-current distribution systems. (2) The series converters consist of three H-bridge inverters, and each of the H-bridge inverters is controlled separately. The control strategy is easier to achieve and can improve the control performance of voltage regulation under unbalanced voltage sag or swell. (3) A three-phase four-leg (3P4L) converter is connected to the common DC bus of the proposed UPQC to connect the renewable energy and energy storage system. The detailed mathematical models of shunt and series converters are analyzed, respectively. A multi-proportional resonant (PR) controller is presented in the voltage regulation and reactive power compensation control algorithms. The simulation results verify the feasibility of the control algorithms. Finally, the experimental platform is established, and the experimental results are presented to verify the validity and superiority of the proposed topology and algorithms.

The Evolution for Voltage and Reactive Power Control in Smart Distribution Systems

2012 ◽  
Vol 13 (1) ◽  
Author(s):  
Hany E. Farag ◽  
Ehab F. El-Saadany ◽  
Ravi Seethapathy
Keyword(s):  
Smart Grid ◽  
Power Control ◽  
Distribution Systems ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Current Control ◽  
Multi Agent Systems ◽  
Reactive Power Control ◽  
Control Scheme ◽  
Control Schemes

This paper has been arisen to show the necessity of the evolution for voltage and reactive power control in distribution systems from conventional to active control techniques. The paper addresses the drawbacks and conflicts that the conventional voltage and reactive power control schemes will face in future distribution systems, especially with high penetration of Distributed Generation (DG). Some of these drawbacks have been verified by carrying out various simulation studies for different IEEE unbalanced radial distribution test systems. The results show that applying the conventional utility voltage regulation control practices in smart grid configuration is intolerable. Therefore, the issue of voltage and reactive power control in smart distribution systems is significant and an evolution of the current control schemes from passive to active is necessary. Using the smart grid technologies, a distributed single layer cooperative control scheme between substation regulators, line regulators and DG units has been proposed. The proposed cooperative scheme is based on the concept of multi-agent systems. Simulation results have been carried out to show the effectiveness of the proposed control scheme.

scholarly journals Hybrid Power Electronic Transformer Model for System-Level Benefits Quantification in Energy Distribution Systems

2021 ◽  
Vol 2 ◽  
Author(s):  
Federico Prystupczuk ◽  
Valentín Rigoni ◽  
Alireza Nouri ◽  
Ramy Ali ◽  
Andrew Keane ◽  
...  
Keyword(s):  
Power Flow ◽  
Distribution Systems ◽  
Reactive Power ◽  
Voltage Regulation ◽  
System Level ◽  
Power Electronic ◽  
Electronic Transformer ◽  
Hybrid Power ◽  
Power Electronic Transformer ◽  
Power Electronic Converter

The Hybrid Power Electronic Transformer (HPET) has been proposed as an efficient and economical solution to some of the problems caused by Distributed Energy Resources and new types of loads in existing AC distribution systems. Despite this, the HPET has some limitations on the control it can exert due to its fractionally-rated Power Electronic Converter. Various HPET topologies with different capabilities have been proposed, being necessary to investigate the system benefits that they might provide in possible future scenarios. Adequate HPET models are needed in order to conduct such system-level studies, which are still not covered in the current literature. Consequently, this article presents a methodology to develop power flow models of HPET that facilitate the quantification of controllability requirements for voltage, active power and reactive power. A particular HPET topology composed of a three-phase three-winding Low-Frequency Transformer coupled with a Back-to-Back converter is modeled as an example. The losses in the Back-to-Back converter are represented through efficiency curves that are assigned individually to the two modules. The model performance is illustrated through various power flow simulations that independently quantify voltage regulation and reactive power compensation capabilities for different power ratings of the Power Electronic Converter. In addition, a set of daily simulations were conducted with the HPET supplying a real distribution network modeled in OpenDSS. The results show the HPET losses to be around 1.3 times higher than the conventional transformer losses over the course of the day. The proposed methodology offers enough flexibility to investigate different HPET features, such as power ratings of the Power Electronic Converter, losses, and various strategies for the controlled variables. The contribution of this work is to provide a useful tool that can not only assess and quantify some of the system-level benefits that the HPET can provide, but also allow a network-tailored design of HPETs. The presented model along with the simulation platform were made publicly available.

scholarly journals Modeling, Control and Placement of FACTS Devices: A Review

2020 ◽  
Vol 39 (4) ◽  
pp. 719-733
Author(s):  
Ayesha Haroon ◽  
Irfan Shafqat Javed ◽  
Huma Rehmat Baig ◽  
Ali Nasir
Keyword(s):  
Power Quality ◽  
Distribution Systems ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Reactive Power Compensation ◽  
System Stability ◽  
Power Electronic ◽  
Power Electronic Converters ◽  
Transmission Systems ◽  
Facts Devices

Over the past two decades, developing distributed energy sources in electric power grid have created new challenges related to the power quality, voltage adjustment and proficient energy utilization. Power electronic converters are widely used to interface the emerging energy systems (without and with energy storage) and smart buildings with the transmission and distribution systems. Flexible Ac Transmission Systems (FACTS) and Voltage-Source Converters (VSC), with smart dynamic controllers, are emerging as stabilization and power filtering equipment to improve the power quality. FACTS devices are of vital significance for tackling the problem of voltage instability which is inevitable and leads to losses in transmission system networks. These devices provide fast voltage regulation, ensure system stability and reactive power compensation. In this regard, modeling, control and appropriate placement of these devices in the transmission lines have been of great importance for researchers of power transmission systems. By using high speed power electronic converters, FACTS perform many times faster than the conventional compensation techniques. FACTS not only provide fast voltage regulation but also damping of active power oscillations and reactive power compensation. Hence, they increase the availability and reliability of the power systems. But, the functioning of a FACTS device extremely reckons upon its parametric quantity, appropriate placement, and sizing in the power network. In this paper, an extensive literature survey is presented to discuss and investigate these parameters of FACTS devices.

Sign in / Sign up

Export Citation Format

Share Document