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Alleviation of power fluctuation in interconnected power systems with wind farm by SMES with optimal coil size
(2012-06-25)
Saejia, Mongkol
;
Ngamroo, Issarachai
The large penetration of wind power into interconnected power systems causes the severe power fluctuation in tie-lines. To alleviate power fluctuation, the superconducting magnetic energy storage (SMES) can be applied. Nevertheless, the installation of SMES is quite costly. Especially, the superconducting coil size which is the vital part of SMES, must be carefully specified. This paper proposes a new optimization technique of power controller parameters and coil sizes of multiple SMES units for alleviation of tie-line power fluctuation in interconnected power systems with wind farms. The structure of active and reactive power controllers of SMES is the proportional-integral (PI). Based on the minimization of the variance of tie-line power fluctuation and the initial stored energy of a SMES unit, the optimal PI parameters and coil size can be automatically tuned by a particle swarm optimization. Simulation study in the West Japan interconnected systems confirms that the proposed SMES with optimal coil size is able to effectively and robustly suppress power fluctuation against various wind power patterns and heavy power flow levels. © 2002-2011 IEEE.
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A robust centralized SMES controller design based on WAMS considering system and communication delay uncertainties
(2011-04-01)
Saejia, Mongkol
;
Ngamroo, Issarachai
It is well known that the communication delay due to the phasor measurement in wide area monitoring system (WAMS) as well as various system operating conditions such as heavy line flows and unpredictable network structures, may deteriorate the wide-area stabilizing control effect. To overcome this problem, the inverse input and output multiplicative model is proposed to represent unstructured uncertainties due to system operations and communication delay in the robust centralized damping controller design of superconducting magnetic energy storage (SMES) based on WAMS. The structure of centralized controller for SMES is the practical 1st-order lead/lag compensator. To automatically tune the control parameters, the optimization problem based on the enhancement of damping performance and system robust stability margin is achieved by particle swarm optimization. Simulation studies in the West Japan six-area interconnected system confirm that the proposed robust SMES centralized controller is superior to the conventional SMES centralized controller in terms of damping performance and robustness against system and time delay uncertainties. © 2010 Elsevier B.V.
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Design of robust centralized PSS based on WAMS considering system and signal transmission delay uncertainties
(2010-12-01)
Saejia, Mongkol
;
Ngamroo, Issarachai
It is well known that the time delay due to the wide-area phasor measurement unit (PMU) as well as various system operations may deteriorate the stabilizing effect of wide area monitoring system (WAMS). To overcome this problem, this paper proposes the design of robust centralized power system stabilizer (PSS) for wide area stabilization taking uncertainties due to system operations and signal transmission delay into account. The uncertainties due to system operations and time delay are represented by the inverse input and output multiplicative model. The structure of centralized PSS controller is the practical second order lead/lag compensator. To automatically tune the control parameter, the optimization problem based on the enhancement of damping performance and system robust stability margin is achieved by particle swarm optimization. Simulation studies in the two-area four-machine interconnected power system confirm that the proposed robust PSS centralized controller is superior to the conventional PPS in terms of robustness against system and time delay uncertainties.
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Wide area robust TCSC controller design considering communication delay uncertainty
(2010-07-30)
Saejia, Mongkol
;
Ngamroo, Issarachai
This paper focuses on a robust fixed structure controller design of thyristor controlled series capacitor (TCSC) for wide area stabilization taking uncertainty due to communication delay into account. Since the control signals measured from phasor measurement units (PMU) are global signals, the communication delay is an inevitable problem. When these PMU signals are used as the input of TCSC, the stabilization effect of TCSC may be deteriorated. To tackle this problem, an uncertainty due to time delay is represented by the inverse input multiplicative model. The structure of controller is the practical lead/lag compensator with single input. To enhance the robustness, the controller parameters are optimized by genetic algorithm (GA). Simulation studies in the two-area four-machine interconnected power system confirm the robustness of the proposed TCSC controller against the delay uncertainty.

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