i-manager's Journal on Electrical Engineering (JEE)


Volume 14 Issue 1 July - September 2020

Research Paper

Alleviation of Subsynchronous Resonance Torsional Oscillations Via Rectifier Controlled Braking Resistor

Mohamed Fayez Ahmed* , Fahmy Metwally Bendary **, Mohamed El-Hadidy ***, Mohamed Adel Mandor ****
* Cairo Electricity Production Company (CEPC), Cairo, Egypt.
**,**** Electrical Engineering Department, Faculty of Engineering Shoubra, Benha University, Cairo, Egypt.
*** Egyptian Electricity Holding Company (EEHC), Cairo, Egypt.
Ahmed, M. F., Bendary, F. M., El-Hadidy, M., and Mandor, M. A. (2020). Alleviation of Subsynchronous Resonance Torsional Oscillations Via Rectifier Controlled Braking Resistor. i-manager's Journal on Electrical Engineering, 14(1), 1-12. https://doi.org/10.26634/jee.14.1.17436

Abstract

Subsynchronous resonance (SSR) oscillations is a problem of great interest in the industry. SSR causes torsional oscillations with ever-increasing amplitudes occurring in the machine shaft sections resulting in a significant premature loss of fatigue life of the shaft metal with the consequent irrevocable fatigue cracks or even a shaft fracture. The main objective of this article is to implement a modern dynamic braking resistor model, namely rectifier controlled braking resistor, controlled via fuzzy logic controller for tempering SSR oscillations. The proposed scheme is authenticated in this work using the wellknown IEEE second benchmark model via MATLAB/Simulink-based modeling and simulation environment. Comparative simulation study of the test system with and without the proposed scheme should demonstrate its effectuality for mitigation of SSR oscillations.

Research Paper

Frequency Regulation in a Multi-Area Power System in the Presence of Hybrid Power System using Support Vector Machine Based Load Frequency Controller

A. Padmaja* , K. R. Sudha**
* Department of Electrical & Electronics Engineering, JNTUK-UCEV, Vizianagaram, India.
** Department of Electrical Engineering, AUCE (A), Andhra University, Visakhapatnam, India.
Padmaja, A., and Sudha, K. R. (2020). Frequency Regulation in a Multi-Area Power System in the Presence of Hybrid Power System using Support Vector Machine Based Load Frequency Controller. i-manager's Journal on Electrical Engineering, 14(1), 13-24. https://doi.org/10.26634/jee.14.1.17619

Abstract

This work focuses on a unique approach for an on-line adaptive tuning of Support Vector Machine (SVM) controller to regulate power system frequency whenever load perturbation occurs. A multi-area power system integrating with Hybrid Wind-Diesel system is considered for the present analysis. The proposed SVM controller is trained by input-output dataset of Proportional-Integral-Derivative (PID)-Load Frequency Controller. Primarily, the SVM controller is trained and analyzed with a three-area, nine-machine power system by neglecting system non-linearities. Further, to account for real-time conditions of the power system, all non-linearities and system uncertainties including variable wind input power are considered for the simulation to test the efficacy of the designed controller. The results show the robustness of the designed SVM controller over conventional PID controller. SVM based Load Frequency Controller ensures the zero steady state error for deviations in the frequency and maintaining minimum over/undershoots, the settling time of the frequency and deviation in the tie-line power under all operating conditions.

Research Paper

Rapid Estimation of AC Side Power Surge in HVDC Linked Asynchronous Grids

Govind Kant Mishra*
Electrical Engineering Department, A.P.J. Abdul Kalam Technical University, Lucknow, India.
Mishra, G. K. (2020). Rapid Estimation of AC Side Power Surge in HVDC Linked Asynchronous Grids. i-manager's Journal on Electrical Engineering, 14(1), 25-28. https://doi.org/10.26634/jee.14.1.17668

Abstract

This paper proposes a novel method of rapid calculation of the peak amplitude of the power surge at one of the AC side in the asynchronous grid connected with a HVDC network due to other AC side fault. The proposed approach is based on simple linear modeling of a HVDC network connecting two asynchronous AC grids. The proposed approach helps in the rapid estimation of peak value of power surge at the AC grid and hence quickly initiating protection measures. The proposed method has been implemented on standard PSCAD HVDC system and results have been compared with calculated values which verify the aforementioned approach.

Research Paper

Performance and Analysis of Multiple Renewable Sources in a Standalone Microgrid

Ch. Laxmi* , M. Narendra Kumar **, Kuldip Singh ***
*,*** Centurion University of Technology and Management, Odisha, India.
** Srinivasa Institute of Engineering and Technology, Amalapuram, Andra Pradesh, India.
Laxmi, C., Kumar, M. N., and Singh, K. (2020). Performance and Analysis of Multiple Renewable Sources in a Standalone Microgrid. i-manager's Journal on Electrical Engineering, 14(1), 29-35. https://doi.org/10.26634/jee.14.1.17594

Abstract

Several renewable sources are utilized with parallel operation with sharing of load depending on dynamic changes in the environmental parameters. Compared to other renewable energy sources, wind is the second largest and highest energy sharing renewable energy source. However, the initial construction cost is high as compared to other renewable sources. After wind systems, solar power generation (PVA) are considered to be most promising renewable sources followed by fuel cell stack. In this paper, we have modeled a standalone renewable source microgrid with multiple sources, viz. wind power generation using PMSG, PVA and battery storage system. Performance of each source is done with respect to variation of load and variation of source parameters such as wind speed, irradiation, temperature and state of charge of the battery. For backup power supply to the load during failure of the renewable sources a battery storage source is provided. This storage source (battery) can be charged when excess power is generated from the solar (PVA) and wind power generation system. Analysis on each sources with dynamic changes of parameters are produced with explanatory graphical representations is done using ‘powergui’ block available in MATLAB Simulink software.

Research Paper

Power Quality Issues in Grid Integrated Solar PV

Kapil Varshney* , Muskaan Ahuja**
*-** Department of Electrical Engineering, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonipat, Haryana, India.
Varshney, K., and Ahuja, M. (2020). Power Quality Issues in Grid Integrated Solar PV. i-manager's Journal on Electrical Engineering, 14(1), 36-41. https://doi.org/10.26634/jee.14.1.17633

Abstract

In last few years, photovoltaic (PV) system become quite popular in domestic level to due to generate electricity, technical feasibility and easy installation. Government is also promoting this by providing subsidies to install solar PV systems. In this study, grid integrated solar PV system is proposed and various powers quality issues in integration are studied. The proposed system comprises of a PV system with variable irradiance which gives variable voltage and current, the PWM type inverter is used to reduce harmonic and convert DC power into AC power for grid integration. These results show various power quality (PQ) issues, i.e., voltage sag swell and harmonic distortion during grid integration occurs on grid. The STATCOM based compensator is proposed to improve power quality to keep different problems within the IEEE standards. The proposed model is developed, simulated and analyzed in MATLAB /SIMULINK environment and the results are discussed.