Simultaneous Planning of Renewable/ Non-Renewable Distributed Generation Units and Energy Storage Systems in Distribution Networks

Jannati, Jamil,Yazdaninejadi, Amin,Talavat, Vahid The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.2

The increased diversity of different types of energy sources requires moving towards smart distribution networks. This paper proposes a probabilistic DG (distributed generation) units planning model to determine technology type, capacity and location of DG units while simultaneously allocating ESS (energy storage systems) based on pre-determined capacities. This problem is studied in a wind integrated power system considering loads, prices and wind power generation uncertainties. A suitable method for DG unit planning will reduce costs and improve reliability concerns. Objective function is a cost function that minimizes DG investment and operational cost, purchased energy costs from upstream networks, the defined cost to reliability index, energy losses and the investment and degradation costs of ESS. Electrical load is a time variable and the model simulates a typical radial network successfully. The proposed model was solved using the DICOPT solver under GAMS optimization software.

A Novel Algorithm for Fault Type Fast Diagnosis in Overhead Transmission Lines Using Hidden Markov Models

Jannati, M.,Jazebi, S.,Vahidi, B.,Hosseinian, S.H. The Korean Institute of Electrical Engineers 2011 Journal of Electrical Engineering & Technology Vol.6 No.6

Power transmission lines are one of the most important components of electric power system. Failures in the operation of power transmission lines can result in serious power system problems. Hence, fault diagnosis (transient or permanent) in power transmission lines is very important to ensure the reliable operation of the power system. A hidden Markov model (HMM), a powerful pattern recognizer, classifies events in a probabilistic manner based on fault signal waveform and characteristics. This paper presents application of HMM to classify faults in overhead power transmission lines. The algorithm uses voltage samples of one-fourth cycle from the inception of the fault. The simulation performed in EMTPWorks and MATLAB environments validates the fast response of the classifier, which provides fast and accurate protection scheme for power transmission lines.

Performance Evaluation of the Field-Oriented Control of Star-Connected 3-Phase Induction Motor Drives under Stator Winding Open-Circuit Faults

Jannati, Mohammad,Idris, Nik Rumzi Nik,Aziz, Mohd Junaidi Abdul The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3

A method for the fault-tolerant vector control of star-connected 3-phase Induction Motor (IM) drive systems based on Field-Oriented Control (FOC) is proposed in this paper. This method enables the control of a 3-phase IM in the presence of an open-phase failure in one of its phases without the need for control structure changes to the conventional FOC algorithm. The proposed drive system significantly reduces the speed and torque pulsations caused by an open-phase fault in the stator windings. The performance of the proposed method was verified using MATLAB (M-File) simulation as well experimental tests on a 1.5kW 3-phase IM drive system. This paper experimentally compares the operation of the proposed fault-tolerant vector controller and a conventional vector controller during open-phase fault.

Power System Rotor Angle Stability Improvement via Coordinated Design of AVR, PSS2B, and TCSC-Based Damping Controller

Jannati, Jamil,Yazdaninejadi, Amin,Nazarpour, Daryush The Korean Institute of Electrical and Electronic 2016 Transactions on Electrical and Electronic Material Vol.17 No.6

The current study is dedicated to design a novel coordinated controller to effectively increase power system rotor angle stability. In doing so, the coordinated design of an AVR (automatic voltage regulator), PSS2B, and TCSC (thyristor controlled series capacitor)-based POD (power oscillation damping) controller is proposed. Although the recently employed coordination between a CPSS (conventional power system stabilizer) and a TCSC-based POD controller has been shown to improve power system damping characteristics, neglecting the negative impact of existing high-gain AVR on the damping torque by considering its parameters as given values, may reduce the effectiveness of a CPSS-POD controller. Thus, using a technologically viable stabilizer such as PSS2B rather than the CPSS in a coordinated scheme with an AVR and POD controller can constitute a well-established design with a structure that as a high potential to significantly improve the rotor angle stability. The design procedure is formulated as an optimization problem in which the ITSE (integral of time multiplied squared error) performance index as an objective function is minimized by employing an IPSO (improved particle swarm optimization) algorithm to tune adjustable parameters. The robustness of the coordinated designs is guaranteed by concurrently considering some operating conditions in the optimization process. To evaluate the performance of the proposed controllers, eigenvalue analysis and time domain simulations were performed for different operating points and perturbations simulated on 2A4M (two-area four-machine) power systems in MATLAB/Simulink. The results reveal that surpassing improvement in damping of oscillations is achieved in comparison with the CPSS-TCSC coordination.

Complex-domain Design and Robustness Analysis for the Control of SSCI in DFIG-based Wind Farms

Hana Jannaty Baesmat,Marc Bodson 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.2

The paper proposes a complex domain control and robustness analysis approach to damping of SubSynchronous Control Interactions (SSCI) in the IEEE first and second benchmark models and is applied to wind farms with Doubly-Fed Induction Generators (DFIG). Two complex pole-placement control laws are proposed to eliminate oscillations at different levels of compensation as well as at varying speed conditions. The complex domain framework reduces the system dimensions by half and facilitates the direct placement of the system poles in the left-half plane, ensuring stability and performance. An observer is designed to estimate the variables that would be difficult to measure at a high sampling rate but are useful to stabilize the systems. Time-domain simulations in MATLAB/Simscape show that the proposed controllers are successful in eliminating oscillations. By leveraging a complex domain representation, the feedback system is analyzed as a single-input single-output (SISO) system. This simplifies the visualization of the robustness of the controllers and makes it possible to compute the gain, phase, and delay margins of the feedback system. These margins are validated in simulations on the full-scale model. The proposed complex pole-placement controller is then compared to other excitation control-based approaches to demonstrate its effectiveness.

Simultaneous Planning of Renewable/ Non-Renewable Distributed Generation Units and Energy Storage Systems in Distribution Networks

Jamil Jannati,Amin Yazdaninejadi,Vahid Talavat 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.2

The increased diversity of different types of energy sources requires moving towards smart distribution networks. This paper proposes a probabilistic DG (distributed generation) units planning model to determine technologytype, capacity and location of DG units while simultaneously allocating ESS (energy storage systems) based on predeterminedcapacities. This problem is studied in a wind integrated power system considering loads, prices and windpower generation uncertainties. A suitable method for DG unit planning will reduce costs and improve reliabilityconcerns. Objective function is a cost function that minimizes DG investment and operational cost, purchased energycosts from upstream networks, the defined cost to reliability index, energy losses and the investment and degradationcosts of ESS. Electrical load is a time variable and the model simulates a typical radial network successfully. Theproposed model was solved using the DICOPT solver under GAMS optimization software.

Power System Rotor Angle Stability Improvement via Coordinated Design of AVR, PSS2B, and TCSC-Based Damping Controller

Jamil Jannati,Amin Yazdaninejadi,Daryush Nazarpour 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.6

The current study is dedicated to design a novel coordinated controller to effectively increase power system rotorangle stability. In doing so, the coordinated design of an AVR (automatic voltage regulator), PSS2B, and TCSC (thyristorcontrolled series capacitor)-based POD (power oscillation damping) controller is proposed. Although the recentlyemployed coordination between a CPSS (conventional power system stabilizer) and a TCSC-based POD controller hasbeen shown to improve power system damping characteristics, neglecting the negative impact of existing high-gainAVR on the damping torque by considering its parameters as given values, may reduce the effectiveness of a CPSSPODcontroller. Thus, using a technologically viable stabilizer such as PSS2B rather than the CPSS in a coordinatedscheme with an AVR and POD controller can constitute a well-established design with a structure that as a highpotential to significantly improve the rotor angle stability. The design procedure is formulated as an optimizationproblem in which the ITSE (integral of time multiplied squared error) performance index as an objective function isminimized by employing an IPSO (improved particle swarm optimization) algorithm to tune adjustable parameters. The robustness of the coordinated designs is guaranteed by concurrently considering some operating conditionsin the optimization process. To evaluate the performance of the proposed controllers, eigenvalue analysis and timedomain simulations were performed for different operating points and perturbations simulated on 2A4M (two-areafour-machine) power systems in MATLAB/Simulink. The results reveal that surpassing improvement in damping ofoscillations is achieved in comparison with the CPSS-TCSC coordination.

CSR and Firm Reputation from Employee Perspective

TANGNGISALU, Jannati,MAPPAMIRING, M.,ANDAYANI, Wuryan,YUSUF, Muhammad,PUTRA, Aditya Halim Perdana Kusuma Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10

This research focuses on the importance of corporate social responsibility in building the company's reputation. Experts have studied CSR as an antecedent of a company's reputation, but the mechanisms underlying this process are rarely explored. Therefore, to fill this research gap, we demonstrate CSR's implementation combined with organizational justice based on discrepancy and equity theory. This study involved 210 employees in a family company. The study's analysis method uses Structural Equation Model (SEM), SmartPLS, with a five-step measurement and analysis procedure. The variables in this study are CSR implementation, organizational justice, employee trust, firm reputation, organizational objectiveness, organizational commitment, job satisfaction, and job performance. The results found that some of the direct relationships stated were not significant, but all demonstrations of indirect links were substantial. Besides, optimal CSR and organizational justice provide a reliable and positive domino effect in increasing the role and consequences of employee trust and firm reputation. The findings in this study confirm that upstream-downstream job performance causality can be successfully achieved if job satisfaction has been realized, job satisfaction can be achieved if organizational commitment can also be recognized, and organizational commitment can be developed. Reflection and influence, rather than organizational attractiveness becomes essential.

Effect of CAR and NPL on ROA: Empirical Study in Indonesia Banks

TANGNGISALU, Jannati,HASANUDDIN, Rusdiah,HALA, Yusriadi,NURLINA, Nurlina,SYAHRUL, Syahruni Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.6

This study seeks to analyze the effect of Non-Performing Loans and Capital Adequacy Ratio on Return on Assets on ten conventional banks listed on the Indonesia Stock Exchange (BEI-IDX). This study uses secondary panel data for 2015-2019 in the form of CAR and NPL values from ten conventional banks listed on the BEI-IDX during the 2020 observation period. The research approach is quantitative descriptive with data analysis methods, namely, linear regression. The testing phase of this study includes: transform value, F-test, T-test and hypothesis test with significancy level sig < 0.05. The results of this study reveal that Non-Performing Loans had a significant negative effect (t = -2,637) (0.011 <0.0) on Return on Assets, while Capital Adequacy Ratio has no significant effect on ROA (0.760 > 0.05). R2 value is 0.128 or 12.8%. It has a significant effect on variables, calling efforts by banks, governments, and authorities monetary of related institutions to maintain the stability of finance. The reduction of Non-Performing Loan impacts on assets and capital adequacy ratio, besides, the normal NPL will control the stability of finance. If a balance is created either in the form of values or amounts of the variables, the reduction in Non-Performing Loans will be controlled.

Performance Evaluation of the Field-Oriented Control of Star-Connected 3-Phase Induction Motor Drives under Stator Winding Open-Circuit Faults

Mohammad Jannati,Nik Rumzi Nik Idris,Mohd Junaidi Abdul Aziz 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3

A method for the fault-tolerant vector control of star-connected 3-phase Induction Motor (IM) drive systems based on Field-Oriented Control (FOC) is proposed in this paper. This method enables the control of a 3-phase IM in the presence of an open-phase failure in one of its phases without the need for control structure changes to the conventional FOC algorithm. The proposed drive system significantly reduces the speed and torque pulsations caused by an open-phase fault in the stator windings. The performance of the proposed method was verified using MATLAB (M-File) simulation as well experimental tests on a 1.5kW 3-phase IM drive system. This paper experimentally compares the operation of the proposed fault-tolerant vector controller and a conventional vector controller during open-phase fault.