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Author: search.filters.author.Surinkaew, TossapornSubject: search.filters.subject.inter-area oscillation

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    Novel Control Design for Simultaneous Damping of Inter-Area and Forced Oscillation
    (2021-01-01)
    Surinkaew, Tossaporn
    ;
    Shah, Rakibuzzaman
    ;
    Muyeen, S. M.
    ;
    Mithulananthan, N.
    ;
    Emami, Kianoush
    Forced oscillation (FO) has recently been detected in power grids, e.g., Nordic and Western American power systems. It has been reported that the FO is excited by forced disturbances, which consist of the frequencies nearly equal to inter-area oscillation frequencies. The FO can lead to severe resonance even for the system with an inter-area damping margin higher than the industry standards. These major events and concerns lead to intensive research of the FO. Though numerous techniques have successfully been applied for FO detection, only a small number of research works have focused on the damping of the FO. Lack of proper control for the FO may lead to instability. Hence, in this paper, a power oscillation damper (POD) is proposed to damp both the FO and inter-area modes simultaneously. The adaptive control technique is applied to enhance the FO mode along with a moving window time, which also avoids the new installation of PODs. Besides, the event-triggered control strategy is used to activate the functions of the new adaptive POD appropriately. The controller's performance and robustness are verified in the modified 14-machine Southeast Australian (SE-A) power system under various uncertainties and disturbances.
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    Wide area robust centralized power oscillation dampers design for DFIG-based wind turbines
    (2014-02-10)
    Surinkaew, Tossaporn
    ;
    Ngamroo, Issarachai
    Inter-area oscillations are associated with machines in one part of the system oscillating against machines in other parts of the system. They are caused by two or more groups of machines that are interconnected by weak ties. To damp out the inter-area oscillations, this paper proposes the new application of wide area stability control for robust centralized power oscillation dampers (PODs) design of doubly-fed induction generator (DFIG) wind turbines. The POD with 2<sup>nd</sup>-order lead/lag compensator structure for each DFIG wind turbine is located at the control center. To stabilize the target inter-area mode effectively, the geometric measures of controllability and observability are used to choose the suitable DFIG wind turbine for stabilizing the target oscillation mode, the proper input signal of POD, and the location of phasor measurement units (PMUs). The input signal of each POD is obtained from PMU while the output signal is transmitted to the rotor side converter voltage controller of DFIG. As a result, the reactive power output of DFIG can be modulated to damp out inter-area oscillations. In the POD parameters optimization, the wide range of power output levels of DFIGs and synchronous generators, time delays due to wide area communication, and unstructured system uncertainties model are taken into account so that the damping of inter-area modes and the system robust stability margin against uncertainties can be guaranteed. Solving the problem by the firefly algorithm automatically, the optimal parameters of PODs can be achieved. The stabilizing performance and robustness of the proposed robust centralized POD are evaluated in the IEEE New England 39 bus system by eigenvalue analyses and nonlinear simulation in scenarios with severe short circuits, N-1 outage contingencies, heavy power flows, and line tripping.
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    Robust decentralized power oscillation dampers design of DFIG wind turbines for stabilization of inter-area oscillation
    (2014-01-01)
    Surinkaew, Tossaporn
    ;
    Ngamroo, Issarachai
    A new decentralized power oscillation dampers (POD) design of doubly-fed induction generator (DFIG) wind turbines for damping of inter-area oscillation is presented in this paper. The practical 2<sup>nd</sup>-order lead/lag compensator with single input signal is used for the POD structure. The POD is equipped with the voltage controller of rotor side converter of DFIG. With the damping signal from POD, the reactive power output of DFIG can be modulated to damp out the oscillations. The parameters optimization of decentralized PODs is conducted over a wide range of tie-line power flow levels so that the damping performance of PODs can be enhanced. The improved firefly algorithm is used to achieve the optimal POD parameters automatically. Study results in a two-area four-machine interconnected system show that the stabilizing effect of proposed decentralized POD is higher than the conventional POD under severe faults, heavy power flows, and wind speeds. © 2014 IEEE.