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Power-flow study

About: Power-flow study is a research topic. Over the lifetime, 8091 publications have been published within this topic receiving 155053 citations. The topic is also known as: load-flow study.


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Proceedings ArticleDOI
22 Jul 2012
TL;DR: In this article, the synchronization of power supplies in an isolated grid with multiple small-to-medium power sources is considered, and the authors show how to achieve a coordinated or synchronized behavior by imposing suitable dynamical behaviors to the controlled converters that interface each power source with the local power bus, without any explicit exchange of information among the power supply units.
Abstract: We consider the synchronization of power supplies in an isolated grid with multiple small-to-medium power sources. We show how to achieve a coordinated or synchronized behavior by imposing suitable dynamical behaviors to the controlled converters that interface each power source with the local power bus, without any explicit exchange of information among the power supply units. This approach avoids the need for an independent communication network and therefore improves the overall system reliability. The method proposed to achieve synchronization does not rely on the common approach of mimicking the dynamical behavior of interconnected synchronous generators.

45 citations

Proceedings ArticleDOI
01 Jan 2003
TL;DR: In this paper, a wide-area measurement system is proposed to monitor and control voltage as well as frequency stability of power systems and describes their state-of-the-art platform, which is now commercially available.
Abstract: With the emphasis on higher utilization of power systems, monitoring of its dynamics is becoming increasingly important. This requires information with higher accuracy and update rates faster than those usually provided by traditional SCADA systems. In addition, it must be synchronized over a wider geographical area than that provided by traditional protection systems. The introduction of phasor measurement units as well as advances in communication and computational equipment have made it technically feasible to monitor the stability of the power system on-line, using a wide area perspective. This paper outlines the specialized applications to monitor and control voltage as well as frequency stability of power systems and describes their state-of-the-art platform, the wide-area measurement system, which is now commercially available.

45 citations

01 Mar 2009
TL;DR: In this article, steady-state modeling of Static VAR Compensator (SVC) and Thyristor Controlled Series Compensators (TCSC) for power flow studies has been represented and discussed in details.
Abstract: in this paper steady-state modeling of Static VAR Compensator (SVC) and Thyristor Controlled Series Compensator (TCSC) for power flow studies has been represented and discussed in details. Firing angle model for SVC was proposed to control the voltage at which it is connected. In same manner firing angle model for TCSC is used to control active power flow of the line to which TCSC is installed. The proposed models take firing angle as state variable in power flow formulation. To validate the effectiveness of the proposed models Newton-Raphson method algorithm was developed to solve power flow equations in presence of SVC and TCSC. Case studies are carried out on 9-bus test system to demonstrate the performance of the proposed models.

45 citations

Patent
10 Nov 2004
TL;DR: In this article, a power storage device is equipped with a power conversion mechanism which performs the charge and discharge of an accumulator on the basis of the converter power command given from a controller.
Abstract: PROBLEM TO BE SOLVED: To effectively perform the output to a power system as the whole hybrid distributed power system, by making effective use of the quantity of power of a storage unit, in the region of residual capacity where a storage unit does not fall in overcharge or overdischarge, by performing the control of placing priority on the power supply to the system for the purpose of protection of the storage device. SOLUTION: This is a power storage device 1 which supplies a power system 4 with power so as to suppress the output ripple of a distributed power source 2, being connected between the distributed power source 2 and the power system 4. The power storage device is equipped with a power conversion mechanism 12 which performs the charge and discharge of an accumulator 11, on the basis of the converter power command given from a controller 13. The controller 13 possesses a charge/discharge command setter 23 which sets the charge/discharge command to bring the charge state of the accumulator 11 close to the target charge state, and a converter power command setter 24 which sets a converter power command on the basis of the charge/discharge command set by the charge/discharge command setter 23, the target supply power to be supplied to the power system 4, and the output power of the distributed power source 2. COPYRIGHT: (C)2006,JPO&NCIPI

45 citations

Journal ArticleDOI
TL;DR: A new control scheme is proposed that enables a centralized PV-grid system to damp out the low frequency power swings on the local area network as an ancillary activity apart from its regular function.
Abstract: Inverter driven, inertia-less interface of a large photovoltaic (PV) source with power grid raises challenging penetration issues such as bus voltage fluctuation, active power variation, reactive power flow and poor system dynamics. Extensive efforts are underway to overcome these issues, which tend to put a limit on the maximum PV power injection capability for a given local area electric power system. This paper proposes a new control scheme that enables a centralized PV-grid system to damp out the low frequency power swings on the local area network as an ancillary activity apart from its regular function. The proposed scheme enhances the power system stability without incorporating any additional devices or systems (e.g., PSS). The analytical basis of the control law used in this scheme is derived from the structure preserving energy function (SPEF) model. A notable feature of the scheme that makes it highly feasible is that it requires only locally measurable signals. Further, it does not affect the MPPT control of the PV system in any manner. All these features make it highly relevant and suitable for smart grid applications. Relevant simulation results as well as key experimental results for a laboratory level hardware model are included.

45 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202325
202283
2021162
2020179
2019228
2018221