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Wide area robust centralized PSO-based specified structure H∞ power system damping controller design considering uncertainties in time delay and system parameters
(2013-02-15)
Ngamroo, Issarachai
It is well known that the time delay due to the wide area phasor measurement may cause a malfunction of wide area centralized control of power system damping controller (PSDC) and system instability eventually. Nevertheless, the uncertainties due to time delay and system parameters have never been considered in the previous researches of PSDC design. To tackle this problem, a wide area robust centralized particle swarm optimization (PSO)-based specified structure H<inf>∞</inf> PSDC design taking uncertainties due to communication delay and system parameters into account is proposed in this paper. Without explicit mathematic equations, the inverse input multiplicative model is applied to represent the unstructured uncertainties. The structure of PSDC is the practical 2nd order lead/lag compensator. To automatically tune the control parameters, the optimization based on an enhancement of damping effect and robust stability margin is achieved by PSO. To evaluate the proposed design technique, two examples of robust centralized PSDC, i.e., power system stabilizer and thyristor control series capacitor are demonstrated in a two-area four-machine interconnected power system,. Simulation study confirm that the proposed robust centralized PSDC is much superior to the conventional centralized PSDC in terms of stabilizing effect and robustness against uncertainties due to time delay and system parameters. © 2013 ICIC International.
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Coordinated control of optimized SFCL and SMES for improvement of power system transient stability
(2012-06-25)
Ngamroo, Issarachai
;
Vachirasricirikul, Sitthidet
It is well known that the Superconducting Magnetic Energy Storage (SMES) is effective to damp the power swing after the occurrence of faults. Nevertheless, if the SMES is also applied for transient stability improvement, a large power capacity of SMES is required. Additionally, the SMES is not able to absorb enough energy during faults since the bus voltage where the SMES is installed, drops considerably. To enhance the SMES control effect and transient stability, this paper proposes the coordinated control of the optimized resistive type superconducting fault current limiter (SFCL) and SMES. When the fault occurs, the SFCL rapidly suppresses the transient power swing by limiting the fault current. Subsequently, the SMES damps out the remaining power swing. The optimization problem of SFCL resistance and power controller parameters of SMES with optimal coil size is formulated based on an augmentation of transient stability margin and damping performance. Solving the problem by the particle swarm optimization, the optimal parameters of SFCL and SMES can be automatically obtained. Simulation study confirms the superior stabilizing effect of the coordinated SFCL and SMES over the individual device. The SFCL not only solves the voltage drop problem at the SMES bus, but also assists the SMES to stabilize the system. Besides, the MW and MJ capacities of the SMES operated with SFCL are significantly reduced. © 2002-2011 IEEE.
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Microgrid stabilization by superconducting magnetic energy storage with optimal energy capacity by genetic algorithm
(2012-01-01)
Ngamroo, Issarachai
In a microgrid with wind and photovoltaic power generations, the intermittent power from these sources may cause a large power fluctuation. Besides, when the severe fault occurs in the system, it may cause the transient power fluctuation. If the power fluctuation cannot be maintained in the acceptable range, the system stability may be deteriorated. To compensate for fast power fluctuation, a superconducting magnetic energy storage (SMES) can be applied. This paper proposes a new optimization technique of SMES power controller with optimal energy capacity. The power controller structure is the first-order lead-lag compensator. The optimization problem of power controller parameters, coil inductance and initial coil current is formulated based on an enhancement of system damping and a minimization of initial energy capacity of SMES. The genetic algorithm is applied to achieve all optimized parameters. Simulation results confirm the control effect of the SMES with optimized energy capacity against various disturbances. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.
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Design and analysis of robust SMES controller for stability enhancement of interconnected power system taking coil size into consideration
(2009-01-01)
Dechanupaprittha, Sanchai
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Sakamoto, Naotoshi
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Hongesombut, Komsan
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Watanabe, Masayuki
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Mitani, Yasunori
In power applications, efficiency and effectiveness of SMES with proper control are promising and highly remarkable, however, quite costly. Accordingly, optimum design and utilization are essentially needed. This paper presents the design and analysis of robust SMES controller for stability enhancement of interconnected power system taking coil size into consideration. With lead/lag controller structure, parameters of robust SMES controller can be optimized by a metaheuristic method; meanwhile, a multiplicative uncertainty is included in the design to cope with system uncertainties. Lastly, aiming at achieving optimum design and utilization, robust controllers for SMES with different coil sizes are examined to investigate performance and robustness under different situations via simulation studies. © 2009 IEEE.
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A practical design of a fuzzy SMES controller based on synchronized phasor measurement for interconnected power systems
(2008-04-23)
Dechanupaprittha, Sanchai
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Hongesombut, Komsan
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Watanabe, Masayuki
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Mitani, Yasunori
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Ngamroo, Issarachai
Recently, fuzzy logic control has widely received attention in various power system applications, despite difficulties of obtaining its control rules and membership functions. Nowadays, power systems consist of multiple areas where load variations with abrupt changes always exist, and proper control rules and membership functions could hardly be achieved. This paper proposes a practical design of fuzzy logic controllers for superconducting magnetic energy storage (SMES) based on a wide area synchronized phasor measurement for enhancing the stability of an interconnected power system. Moreover, a heuristic method is applied for determining control rules and membership functions. The estimated model is determined via a simplified oscillation model for detection and assessment of an approximated inter-area oscillation mode. Finally, some simulation studies based on a two-area four-machine power system are carried out to examine the performance and effectiveness of the designed fuzzy SMES controller. Copyright 2008 The Berkeley Electronic Press. All rights reserved.
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A practical design of fuzzy SMES controller based on synchronized phasor measurement for interconnected power system
(2007-12-01)
Dechanupaprittha, Sanchai
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Hongesombut, Komsan
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Watanabe, Masayuki
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Mitani, Yasunori
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Ngamroo, Issarachai
Recently, fuzzy logic control has widely received attention in various power system applications, despite difficulties of obtaining its control rules and membership functions. Nowadays, power system consists of multiple areas where load variations with abrupt changes always exist, and proper control rules and membership functions could be hardly achieved. This paper proposes a practical design of fuzzy logic controllers for superconducting magnetic energy storage (SMES) based on wide area synchronized phasor measurement for improving stability of interconnected power system. Moreover, a heuristic method is applied for determining control rules and membership functions. The estimated model is determined via a coupled vibration model for detection and assessment of an approximated inter-area oscillation mode. Finally, some simulation studies based on a two-area four-machine power system are carried out to examine the performance and effectiveness of the designed fuzzy SMES controller. © 2007 RPS.
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Test results of evaluating eigen-characteristics of interarea power swing mode derived from PMU data in Thailand system
(2007-12-01)
Higuma, Kenichiro
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Dechanupaprittha, Sanchai
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Morimoto, Hisayosi
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Watanabe, Masayuki
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Mitani, Yasunori
The status of Thailand power system in northern, central and southern areas are monitored and collected by using multiple synchronized Phasor Measurement Units (PMUs). An analysis result of oscillation characteristics shows clearly that the power oscillation is observable at a frequency around 0.5Hz between central and southern areas. The power system stability is analyzed by determining eigenvalue from phase difference between central and southern areas. In this paper, the eigen-characteristics estimated from the PMU data in the steady state fluctuations have been confirmed by comparing the transient behaviour when a large disturbance occurred in the power system. Accordingly, methods of estimating eigenvalues from system data were examined. As a result, transitions of the stability could be estimated systematically using proposed methods.

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