scholarly journals Analysis of Power Flow Under Non-Sinusoidal Conditions in the Presence of Harmonics and Interharmonics Using Geometric Algebra

2019 ◽  
Author(s):  
Francisco G. Montoya ◽  
Raúl Baños ◽  
Alfredo Alcayde ◽  
Francisco M. Arrabal-Campos
Keyword(s):  
Power Systems ◽  
Geometric Algebra ◽  
Power Flow ◽  
Precise Determination ◽  
Active Power ◽  
Mathematical Framework ◽  
Non Linear ◽  
Active Power Flow ◽  
Definition Of ◽  
Open Question

The calculation of power flow in power systems with the presence of harmonics has been properly studied in the scientific literature. However, power flow calculation considering interharmonic components is still an open question. Traditional methods based on the IEEE1459 standard have proven to be valid and accurate only for linear and sinusoidal systems, but have been criticized for non-linear and non-sinusoidal systems because they are not able to explain correctly the current and voltage interactions beyond the active power. This paper proposes the use of a novel mathematical framework called geometric algebra (GA) to study the power flow considering the interaction of current and voltage harmonics and interharmonics. The use of GA enables the precise determination of the direction and magnitude of the total and single active power flow for each component, as well as other power elements related to the non-active power due to cross interaction. Moreover, this paper makes a novel contribution to the definition of interharmonics in geometric algebra space that has not been done before. To test the validity of the method, both linear and non-linear circuits are proposed and solved by applying voltages and currents with harmonic and interharmonic components. The results obtained show that power flow can be analyzed under the prism of the principle of energy conservation (PoCoE) in a way that allows a better understanding of the power spectrum due to the interaction of harmonics and interharmonics of voltage and current.

Transient Stability Enhancement Using Multilevel Inverter Based UPFC

2014 ◽  
Vol 573 ◽  
pp. 722-727
Author(s):  
Bose Arun ◽  
B.V. Manikandan
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Transient Stability ◽  
Fault Simulation ◽  
Active Power ◽  
Unified Power Flow Controller ◽  
Power Flow Control ◽  
Active Power Flow ◽  
Flow Through ◽  
And Performance

Power flow control is important in power systems and recently becomes more urgent because of the deregulation. This paper presents a novel configuration of unified power flow controller and performance of UPFC intended for installation on transmission line. When no UPFC is installed, any interruption in the line due to fault reduces the active power flow through the line. Installing the UPFC makes it possible to control an amount of active power flow through the line. Simulations were carried out using Matlab to validate the performance of UPFC. Keywords: FACTS Devices, UPFC, Transient stability, Matlab, Fault simulation.

Parameter Determination for Back-to-Back Converters in Power Systems to Enhance Interface Flow Margins

2012 ◽  
Vol 433-440 ◽  
pp. 3964-3968
Author(s):  
Sung Min Ohn ◽  
Hwa Chang Song ◽  
Byong Hoon Jang
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Optimization Problem ◽  
Active Power ◽  
Current Level ◽  
Parameter Determination ◽  
Fault Current ◽  
Load Demand ◽  
Active Power Flow ◽  
Flow Through

This paper presents a method to determine parameters of BTB (back-to-back) converters in terms of the enhancement of interface flow margins. Interface flow margin is by definition a measure of how much active power can be transferred from the external areas to the study area with the fixed load demand, and it is mainly constrained by system voltage stability. BTB converters are controllable equipments with the active power flow through them, and its DC link in fact can divide the AC systems at the location and hence can reduce the fault current level. This paper first calculates margin enhancement sensitivities at the nose point of F-V curves and formulates an optimization problem to update the BTB parameters to improve the margins. This procedure is repeated performed until the required margin enhancement is achieved.

Active Power Flow Control in Inverter using Sliding Mode Controller

2021 ◽  
Author(s):  
Arpit Sharma ◽  
Adarsh Kashyap ◽  
Ayushi Saxena ◽  
Arunprasad Govindharaj ◽  
A Ambikapathy
Keyword(s):  
Flow Control ◽  
Power Flow ◽  
Sliding Mode ◽  
Active Power ◽  
Sliding Mode Controller ◽  
Power Flow Control ◽  
Active Power Flow

Determination of Marginal Power Flows Based on an Adaptive Gradual Load Increase Trajectory

Vestnik MEI ◽  
2021 ◽  
pp. 20-30
Author(s):  
Natalya L. Batseva ◽  
◽  
Vasiliy A. Sukhorukov ◽  
Keyword(s):  
Power Flow ◽  
Active Power ◽  
Power Grids ◽  
Small Signal ◽  
Mode Change ◽  
Operation Speed ◽  
Load Increase ◽  
Active Power Flow ◽  
Change Vector ◽  
The Difference

The aim of the study is to develop a technique for searching an adaptive gradual load increase trajectory for power grids with a chain structure and to test this technique on the monitored 500 kV backbone grid sections. The technique for searching an adaptive gradual load increase trajectory was developed proceeding from the theoretical data about the chain structures of power grids and about the specific features of their operation modes. The voltage levels at the 500 kV backbone grid nodes and normalized phase angles across the ties included in the studied section and in the adjacent monitored sections are adopted as criteria for monitoring loss of small-signal aperiodic stability in the section under study. Special attention is paid to active power flows through the monitored adjacent sections with respect to the section under study. The proposed technique was tested on two monitored sections of the backbone 500 kV grid. The numerical analysis results have shown that under certain grid configuration and mode conditions, the marginal active power flow determined according to the proposed technique is either higher than the marginal active power flow determined using the mode change vector with the difference between the values from 54 MW to 319 MW, or lower than the marginal flow, with the difference between the values from 121 MW to 228 MW. It has been established that the difference between the values is caused by higher or lower loading of the monitored adjacent sections with respect to the section under study. Grid configuration and mode conditions has also been found in which the marginal active power flows determined according to the proposed technique and the mode change vector are almost identical with one another with the difference making about 15 MW. The subsequent algorithmic implementation of the procedure and development of the relevant software will make it possible to apply it to a larger number of monitored sections and to study various grid configuration and mode conditions for accumulating statistical data. If the software operation speed requirements in a close-to-real-time mode are satisfied, the software will be adapted to the Stability Margin Monitoring System software package. On the whole, the testing of the proposed technique for chain-shaped grids allowed us to conclude that the procedure can be used for searching an adaptive gradual loading trajectory and determining marginal active power flows in regard of small-signal aperiodic stability using the power system analysis model corresponding to the current grid configuration and mode conditions.

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