Wide Range Reactive Power Compensation for Voltage Unbalance Mitigation in Electrical Power Systems

2021 ◽  
pp. 1-14
Author(s):  
Jasim A. Ghaeb ◽  
Malek Alkayyali ◽  
Tarek A. Tutunji
Keyword(s):  
Power Systems ◽  
Reactive Power ◽  
Electrical Power ◽  
Reactive Power Compensation ◽  
Electrical Power Systems ◽  
Voltage Unbalance ◽  
Wide Range

scholarly journals A new approach to three-phase asynchronous motor model for electric power system analysis

2021 ◽  
Vol 12 (4) ◽  
pp. 2083
Author(s):  
Laura Collazo Solar ◽  
Angel A. Costa Montiel ◽  
Miriam Vilaragut Llanes ◽  
Vladimir Sousa Santos
Keyword(s):  
Power Systems ◽  
Reactive Power ◽  
Mechanical Load ◽  
Asynchronous Motor ◽  
Electrical Power ◽  
Variable Load ◽  
Electrical Power Systems ◽  
Active And Reactive Power ◽  
Voltage Variation ◽  
Three Phase

In this paper, a new steady-state model of a three-phase asynchronous motor is proposed to be used in the studies of electrical power systems. The model allows for obtaining the response of the demand for active and reactive power as a function of voltage and frequency. The contribution of the model is the integration of the characteristics of the mechanical load that can drive motors, either constant or variable load. The model was evaluated on a 2500 kW and 6000 V motor, for the two types of mechanical load, in a wide range of voltage and frequency, as well as four load factors. As a result of the evaluation, it was possible to verify that, for the nominal frequency and voltage variation, the type of load does not influence the behavior of the powers and that the reactive power is very sensitive to the voltage variation. In the nominal voltage and frequency deviation scenario, it was found that the type of load influences the behavior of the active and reactive power, especially in the variable load. The results demonstrate the importance of considering the model proposed in the simulation software of electrical power systems.

Investigation of Harmonic Current Aggregation in the TBE/Eletronorte Transmission System

2020 ◽  
Author(s):  
Maise N. S. da Silva ◽  
Rafael S. Salles ◽  
Alexandre Degan ◽  
Carlos A. Duque ◽  
Paulo F. Ribeiro
Keyword(s):  
Power Systems ◽  
Electrical Power ◽  
Transmission System ◽  
Phase System ◽  
Electrical Networks ◽  
Electrical Power Systems ◽  
Estimation Errors ◽  
Planning Stage ◽  
Harmonic Currents ◽  
Wide Range

Harmonic distortions are not new problems in electrical power systems. However, electrical networks have undergone several changes in recent decades, such as the wide range of electronic devices (converters, control devices, etc.), and those equipment produce emission of harmonic currents. The investigation of the contribution of several sources of harmonics in power systems is essential, considering that it is a problem of power quality that cannot be neglected. Thispaper aims to investigate the aggregation of harmonic currents in a 230kV TBE/Eletronorte system. For this, the transmission system was modeled using MATLAB/Simulink software with the typical values provided by TBE. A vectorial analysis was performed for the three-phase system and a sum analyzes of harmonics from different sources on Phase A, to estimate the influence of those current sources on Castanhal and Guama buses, when a harmonic spectrumis present on Vila do Conde and Utinga buses. In both analyzes, a phase angle spectrum of 10 and 20 degrees was applied in the harmonic source of Utinga. The summation analyzes proved to be useful because it can estimate values that harmonic currents can assume, for different conditions, and can be very useful in the planning stage to avoid estimation errors.

scholarly journals Study of the Sustainability of Electrical Power Systems: Analysis of the Causes that Generate Reactive Power

2019 ◽  
Vol 11 (24) ◽  
pp. 7202 ◽  
Author(s):  
M. A. Graña-López ◽  
A. García-Diez ◽  
A. Filgueira-Vizoso ◽  
J. Chouza-Gestoso ◽  
A. Masdías-Bonome
Keyword(s):  
Power Systems ◽  
Systems Analysis ◽  
Reactive Power ◽  
Electrical Power ◽  
Reactive Elements ◽  
Unified Theory ◽  
Electrical Power Systems ◽  
Three Phase ◽  
Useful Power ◽  
Phase Systems

Reactive power is an important parameter in electrical power systems since it affects the efficiency of the system because it is not useful energy. It decreases the power factor of the system and limits the ability of generators to deliver useful power. It is therefore necessary to understand and correctly measure the phenomenon of reactive energy in three-phase systems. In this paper, we analyze reactive power in linear and unbalanced three-phase systems using the Unified Theory of Electrical Power and the Institute of Electrical and Electronics Engineers Standard 1459-2010 (IEEE Std. 1459-2010) to obtain expressions for reactive power in balanced and unbalanced systems and noting that there are terms that exist only for unbalanced systems. Analysis of the measurements carried out led us to identify the existence of two components of reactive power—that due to reactive elements, and that caused by unbalances in the system. Knowing the causes that generate reactive power, it is possible to act more effectively on the problem and therefore achieve a more sustainable generation of electric power and a lower environmental impact.

scholarly journals Analysis of the Response of a Static Reactive Power Compensator to Instability and Failure in Electrical grids

2021 ◽  
Vol 2065 (1) ◽  
pp. 012023
Author(s):  
Víctor Manuel Maridueña ◽  
Edwin Arnaldo Castro ◽  
Nelson Layedra
Keyword(s):  
Power Systems ◽  
Reactive Power ◽  
Electrical Power ◽  
Power Grids ◽  
Electrical Power Systems ◽  
Flexible Ac Transmission ◽  
Electrical Grids ◽  
Ac Transmission ◽  
And Control ◽  
Reactive Power Compensator

Abstract The reliability of electrical power systems has led to the implementation of new equipment with reliable technology to solve transient failures, in recent decades flexible AC transmission systems (FACTS) have been implemented in power grids, resulting in high levels of stability and control. One of the elements used is static VAR compensators (SVC), however there is very little information about the dynamic response of the device to network instability and electrical failures, for which Simulink analyses the response of the SVC. The device consists of a 47.1 MVar reactive power compensator and a 97.6 MVar inductive reactivator compensator, implemented in a three-phase 500 kV system. The results indicate the effectiveness of response against network instability while maintaining the stable voltage of the network, but against electrical failures the type and time of failure must be considered. In the case of phase-phase faults, the response of the SVC is limited with drops of 0.52 pu.

scholarly journals Dynamics of Momentary Reserves under Contingency: Observations from Numerical Experiments

2021 ◽  
Author(s):  
Kosisochukwu Pal Nnoli ◽  
Stefan Kettemann
Keyword(s):  
Power Systems ◽  
Reactive Power ◽  
Control Method ◽  
Frequency Control ◽  
Electrical Power ◽  
System Stability ◽  
Optimal Placement ◽  
Electrical Power Systems ◽  
Primary Frequency ◽  
Primary Frequency Control

This paper presents the studies and investigations on the dynamics of momentary reserves in electrical power systems under contingency. Momentarily reserve through the machine's inertia serves the purpose of primary frequency control and prevents voltage collapse in the case of reactive power reserves. A simulation was performed on a realistic Nigerian 330 kV transmission network in PowerFactory software to study and investigate the mechanism of these reserve functions on the network buses as an inertia active power control method. Moreover, we investigated the influence of geodesic increment of momentary reserve on the decay of disturbances. The results indicated that the momentary reserve by inertia alone reduces the frequency deviation from its nominal value, delays the transmission of disturbances and enhances the damping of oscillations by reducing the final frequency settling time at the buses under contingency. This numerical experiment also suggests the optimal placement of the momentary reserves in the grid in order to improve system stability against power outage disturbances.

scholarly journals Understanding Reactive Power and Its Importance in Power Systems

2020 ◽  
Vol 9 (2) ◽  
pp. 880-883
Keyword(s):  
Magnetic Field ◽  
Power Systems ◽  
Transmission Lines ◽  
Reactive Power ◽  
Electrical Power ◽  
Electrical Machines ◽  
Voltage Profile ◽  
Electrical Power Systems

The main intent and purpose of this paper is to flaunt the rudimentary and homespun idea of reactive power on electrical power systems. Electrical machines such as motors and generators require reactive power for the production of magnetic field. Transformers and transmission lines too obligatory reactive power while they bring up with resistance and inductance contend with the flow of current. The Voltage profile must be uplifted to push this power through line inductance. Suitable reactive power when not used can cause contemplative blackouts.

Sign in / Sign up

Export Citation Format

Share Document