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28 results on '"Lian, K. L."'

10. A Novel MPPT Method Based on Cuckoo Search Algorithm and Golden Section Search Algorithm for Partially Shaded PV System

Author

Nugraha, Dimas Aji, Lian, K. L., and Suwarno

Abstract

Partial shading is a common and difficult problem to be solved in a photovoltaic (PV) system. Numerous efforts have been introduced to mitigate this problem. Some commonly used approaches are deploying some metaheuristic (MH) algorithm to track the multiple-peak P-V curve of partially shaded PV system. Cuckoo search (CS) is a new optimization algorithm based on the MH approach. It has been used to solve an optimization problem in many applications, including the maximum power point tracking (MPPT) problem. The CS algorithm performs well in tracking the global maximum power point (GMPP). However, just like any other MH algorithm, there is still a dilemmatic trading between their accuracy and the tracking time needed to find GMPP. This paper proposes a new MPPT algorithm by combining the CS algorithm with golden section search (GSS) to take beneficial features from both the algorithms. To validate the proposed algorithm, it is evaluated with various cases of partial shading. The simulation and experimental results show a noticeable performance improvement compared with the original CS algorithm and other MH algorithms.

Published
2019
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26. Harmonic Analysis of a Three-Phase Diode Bridge Rectifier Based on Sampled-Data Model.

Author

Lian, K. L., Perkins, Brian K., and Lehn, P. W.

Subjects
*TIME-domain analysis, *ELECTRIC current rectifiers, *CAPACITORS, *HARMONIC analysis (Mathematics), *SWITCHING circuits, *SWITCHING diodes, *JACOBIAN matrices, *ITERATIVE methods (Mathematics), *MATHEMATICAL analysis
Abstract

This paper presents a time domain method to analyze the three phase rectifier with capacitor output filter. As demonstrated in the paper, the proposed method analytically evaluates harmonics, and obtains exact switching functions by iteratively solving for the switching instants. An analytical Jacobian of the mismatch equations is obtained to ensure a quadratic convergence rate for the iteration process. It is also demonstrated that a unified approach exists to analyze converters operating in the continuous conduction mode and discontinuous conduction mode. One potential application of the proposed model is to incorporate it into a harmonic power flow program to yield improved accuracy. [ABSTRACT FROM AUTHOR]

Published
2008
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27. Steady-State Solution of a Voltage-Source Converter with Full Closed-Loop Control.

Author

Lian, K. L. and Lehn, P. W.

Subjects
*ITERATIVE methods (Mathematics), *NUMERICAL analysis, *ELECTRIC potential, *CASCADE converters, *LINEAR control systems, *HARMONIC analysis (Mathematics), *CALCULUS
Abstract

An iterative method based on a hybrid time/frequency-domain approach is proposed in this paper to solve for the steady state of a pulse width modulated voltage-source converter (VSC) with a dq-frame closed-loop controller. The method solves the linear controller equations in the frequency domain, while solving the VSC equations using time domain techniques. The model is validated against time domain simulation results. It is shown that the hybrid time/frequency-domain approach is both highly efficient and accurate, and it provides a viable alterative to brute-force time domain simulation for large signal harmonic analysis of the VSC. [ABSTRACT FROM AUTHOR]

Published
2006
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28. Real-Time Simulation of Voltage Source Converters Based on Time Average Method.

Author

Lian, K. L. and Lehn, P. W.

Subjects
*DIGITAL computer simulation, *ELECTRICAL harmonics, *LOGIC devices, *ELECTRONIC equipment, *ALGORITHMS, *MATHEMATICAL models
Abstract

When a realtime digital simulator, emulating a switched circuit such as a voltage source converter, is interfaced with a digital controller, the controller's firing signals may not be in synchronism with the simulation time step. Several methods to minimize the resulting inaccuracies have been proposed in the past. However, some of these approaches introduce unnecessary delays and/or generate artificial harmonics. In this paper, a method based on time averaging is presented. The algorithm is shown to be last, easy to implement in a programmable logic device, and highly accurate. The method is applied in a hardwarein-the-loop simulation, and the simulation results are compared with experimental results. [ABSTRACT FROM AUTHOR]

Published
2005
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