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Busan, South Korea

Park O.-S.,STX Engine | Park J.-W.,Pusan National University | Bae C.-B.,LSIS | Kim J.-M.,Pusan National University
Journal of Power Electronics | Year: 2013

This paper proposes a new dead time compensation method of independent six-phase permanent magnet synchronous motors (IS-PMSM). The current of the independent phase machines contains odd-numbered harmonics because of the dead time and the nonlinear characteristics of the switching devices. By using the d-q-n three-dimensional vector analysis, these harmonics can be extracted at the n-axis current. Thus, the current distortion can be compensated by controlling the n-axis current of the IS-PMSM to zero. The proposed method is simple and can be easily implemented without additional hardware setup. The validity of the proposed compensation method is verified with simulations and several experiments.

Andaloussi C.,LSET | Chalh Z.,LSIS | Hihi H.,LGECOS
2014 2nd World Conference on Complex Systems, WCCS 2014 | Year: 2014

The study of the inversion of multivariable linear time varying systems modelled by bond-graph is proposed in this paper. An analysis method based on non-commutative differential algebra concepts is presented. The inverse and the reduced inverse models are studied depending on the decouplability of the multivariable LTV system. To show the interest of this new approach, two applications have been realized, among which is the thyristor circuit model TCSC often used in power electronics. © 2014 IEEE.

Yoo A.,LSIS | Lee S.-H.,Myongji University | Yoon Y.-D.,Myongji University
2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015 | Year: 2015

This paper proposes a parameter identification method of induction motors (IMs) at a standstill using integral calculations. The rotor time constant and magnetizing inductance are identified. During identification process, the induction motor to be tested is consistently excited according to a pre-determined current reference. Using the pre-determined current, the tested motor emulates the rated rotor flux and the rated slip condition even at a standstill. Therefore, the identification result is quite accurate. And, this method is based on integral calculation so that the results are robust to measurement noise. The repeatability of the identification result is remarkable. Due to the simplicity of the proposed technique, this method can be easily applied to the commercial inverter products. Experimental results confirm the effectiveness of the proposed method. © 2015 IEEE.

Lim I.-H.,LSIS | Sidhu T.S.,University of Ontario Institute of Technology
International Journal of Electrical Power and Energy Systems | Year: 2016

Importance of protection IEDs in IEC 61850-based substations has increased by enhancing performance of IEDs but local backup scheme in the substation is not considered important. In the existing local backup method, two protection IEDs are installed for one protection target. This method is useful for local backup of the IEDs. However, local backup at simultaneous fault of the protection IEDs is not performed in conventional substation because it has limitations on operational environment. However, IEC 61850-based substation improves operational environment with high speed communication network and high performance IEDs; and the simultaneous fault problem can be resolved by developing new devices and schemes. Therefore, this paper proposes a new local backup scheme for simultaneous faults of protection IEDs in an IEC 61850-based substation. The proposed backup scheme is configured as self-supervision-based monitoring, new improved local backup IED, and local backup scheme; and the proposed scheme is implemented and tested using IEC 61850 SISCO library on a laboratory test bed. © 2015 Elsevier Ltd.

Amari S.,Ecole Normale Superieure de Cachan | Demongodin I.,LSIS | Loiseau J.J.,French National Center for Scientific Research | Martinez C.,French National Center for Scientific Research
IEEE Transactions on Automatic Control | Year: 2012

The aim of the presented work is the control of Timed Event Graph to meet tight temporal constraints. The problem of temporal constraints is formulated in terms of control of linear Max-Plus models. First, the synthesis of a control law that ensures the satisfaction of a single constraint for a single input system is presented. Then, the single input multi-constraints problem is tackled and finally, the method is extended to the multi-inputs, multi-constraints problem. The proposed method is illustrated on the example of a simple production process. © 2011 IEEE.

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