Q'HARM-a harmonic power-flow program for small power systems

1988 ◽  
Vol 3 (3) ◽  
pp. 949-955 ◽  
Author(s):  
J.P. Tamby ◽  
V.I. John
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Small Power ◽  
Harmonic Power

Monte Carlo Simulation of a Microgrid Harmonic Power Flow

2014 ◽  
Vol 15 (2) ◽  
pp. 129-140 ◽  
Author(s):  
Abdullahi Lanre Amoo ◽  
Usman O. Aliyu ◽  
Dalila Mat Said ◽  
Abdullah Asuhaimi Mohd Zin ◽  
Abubakar Sadiq Bappah
Keyword(s):  
Monte Carlo ◽  
Power Systems ◽  
Power Flow ◽  
Harmonic Distortion ◽  
Power Utility ◽  
Quality Performance ◽  
Demand Factor ◽  
Utility Companies ◽  
Power Systems Operation ◽  
Harmonic Power

Abstract With the transformation of power utility companies from vertical structure to full deregulated entities, the need for the integration of distributed generation (DG) resource in the form of Microgrid (MG) system would soon become indispensable in most deregulated power systems. This is due to renewability of such generation systems. The power quality performance in terms of intermittent energy of these DG systems supply is the major limitation to their full integration as the sole generation entities that can propel rapid decentralization of electric power systems operation. Nonetheless, the acceptable standard is to operate them in an islanding mode or as a MG optimally dispatch among generation mix. This paper developed a total harmonic distortion models for a Microgrid bus in a Nigerian grid system and applied Monte Carlo technique to reliably predict the level of harmonic power flow in the system. The result shows that the distortion increases as the demand factor of the station decreases.

scholarly journals Power flow in radial distribution systems in the presence of harmonics

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Miloš Milovanović ◽  
Jordan Radosavljević ◽  
Bojan Perović ◽  
Milorad Dragičević
Keyword(s):  
Power Systems ◽  
Radial Distribution ◽  
Power Flow ◽  
Distribution Systems ◽  
Flow Problem ◽  
Harmonic Distortion ◽  
Distribution Networks ◽  
Nonlinear Loads ◽  
Harmonic Power ◽  
Power Flow Problem

This paper presents the results of power flow calculations in the presence of harmonics in radial distribution systemsobtained using the decoupled harmonic power flow (DHPF) algorithm. In this algorithm, the interaction among the harmonicfrequencies is assumed to be negligible and hence the calculations are separately performed for every harmonic order of interest. Adetailed methodology for calculating current and voltage high order harmonics, harmonic losses and total harmonic distortion ofvoltage of the electrical distribution networks in the frequency domain is presented. The standard backward/forward sweep method isused for solving the power flow problem at the fundamental frequency. Furthermore, some practical and approximated models ofnetwork components in harmonic analysis are given. The performance of the DHPF approach is studied and evaluated on two standardtest systems with nonlinear loads, the distorted IEEE 18-bus and IEEE 33-bus. Nonlinear loads are treated as harmonic current sourcesthat inject harmonic currents into the system. The DHPF algorithm is verified by comparing its results with those generated bysoftware tools for the analysis of transmission, distribution and industrial power systems (i.g. ETAP and PCFLO). Simulation resultsshow the accuracy and efficiency of the applied procedure for solving the harmonic power flow problem.

Harmonic power flow of VSC-HVDC based AC/DC power systems

2016 ◽  
Vol 133 ◽  
pp. 355-364 ◽  
Author(s):  
Bo Liu ◽  
Zhengchun Du ◽  
Chongtao Li
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Dc Power ◽  
Harmonic Power ◽  
Dc Power Systems

Research on Power Measurement in Harmonics Disturbance Circumstances

2011 ◽  
Vol 403-408 ◽  
pp. 3253-3257
Author(s):  
Yu Xu
Keyword(s):  
Power Systems ◽  
Measurement Errors ◽  
Power Flow ◽  
Harmonic Wave ◽  
Electric Energy ◽  
Power Measurement ◽  
Current Status ◽  
Harmonic Pollution ◽  
Definition Of ◽  
Harmonic Power

Due to the rapid growth of non-linear loads in power systems, harmonic pollution is becoming more and more serious. Begin with the definition of harmonic power, the direction of power flow is analyzed from the sides of both fundamental and harmonic wave. Through a harmonic simulation circuit based on PSCAD/EMTDC, the conclusion that as a result of harmonic, harmonic-sources have their metered electric energy reduced, while non-harmonic-sources increased has been brought out. What's more, according to the result of simulation, the interactive influence of fundamental and harmonic wave on power measurement is proposed. Due to the above conclusion and the work principles of electromagnetic induction meter and electric meter, the reasons of measurement errors are found. And at the end of this paper, the development and current status of power definition which is a necessary key to the power measurement are discussed.

scholarly journals Dynamic grid fault analysis in wind power plant with DFIG by using supervisory control and data acquisition (SCADA) viewer

2020 ◽  
Vol 181 ◽  
pp. 03006
Author(s):  
Nduwamungu Aphrodis ◽  
Ntagwirumugara Etienne ◽  
Utetiwabo Wellars ◽  
Mulolani Francis
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Control Strategies ◽  
Electrical Power ◽  
Fault Analysis ◽  
Operational Mode ◽  
Electrical Power Systems ◽  
Fault Ride Through ◽  
Before And After ◽  
Clearing Time

Faults in electrical power systems are among the key factors and sources to network disturbances, however control strategies are among key faults clearing techniques for the sake of safe operational mode of the system.Some researchers have shown various limitations of control strategies such as slow dynamic response,inability to switch Off and On network remotely and fault clearing time. For a system with wind energy technologies, if the power flow of a wind turbine is interrupted by a fault, the intermediate-circuit voltage between the machine-side converter and line-side converter will fall in unacceptably high values.To overcome the aforementioned issues, this paper used a Matlab simulations and experiments in order to analyze and validate the results.The results showed that fault ride through (FRT) with SCADA Viewer software are more adaptable to the variations of voltage and wind speed in order to avoid loss of synchronism. Therefore at the speed of 12.5m/s a wind produced a rated power of 750W and remained in synchronization before and after a fault created and cleared but worked as generator meanwhile at speed of 3.4m/s wind disconnected from grid and started working as a motor and consumed active power (P=-25watts) and voltage dip at 100% .For the protection purpose, the DC chopper and crowbar should be integrated towards management of excess energy during faults cases.

scholarly journals A Full-Newton AC-DC Power Flow Methodology for HVDC Multi-Terminal Systems and Generic DC Network Representation

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1658
Author(s):  
Leandro Almeida Vasconcelos ◽  
João Alberto Passos Filho ◽  
André Luis Marques Marcato ◽  
Giovani Santiago Junqueira
Keyword(s):  
Power Systems ◽  
Direct Current ◽  
Power Flow ◽  
Large Scale ◽  
Flow Problem ◽  
Control Strategies ◽  
Problem Formulation ◽  
Expansion Planning ◽  
Dc Power ◽  
Power Flow Problem

The use of Direct Current (DC) transmission links in power systems is increasing continuously. Thus, it is important to develop new techniques to model the inclusion of these devices in network analysis, in order to allow studies of the operation and expansion planning of large-scale electric power systems. In this context, the main objective of this paper is to present a new methodology for a simultaneous AC-DC power flow for a multi-terminal High Voltage Direct Current (HVDC) system with a generic representation of the DC network. The proposed methodology is based on a full Newton formulation for solving the AC-DC power flow problem. Equations representing the converters and steady-state control strategies are included in a power flow problem formulation, resulting in an expanded Jacobian matrix of the Newton method. Some results are presented based on HVDC test systems to confirm the effectiveness of the proposed approach.

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