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Author: search.filters.author.Pothisoonthorn, SukanyaHas files: No

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    Power swing and voltage stabilization by PV generator with active and reactive power controls
    (2017-07-13)
    Pothisoonthorn, Sukanya
    ;
    Ngamroo, Issarachai
    ;
    Kunakorn, Anantawat
    Undamped power and voltage swings of synchronous generators due to severe disturbances may make power systems unstable. To tackle this problem, this paper proposes a control scheme of active and reactive power outputs of a photovoltaic (PV) generator equipped with power oscillation dampers (PODs). The PODs with second-order lead/lag structure are installed in the active and reactive power control loops of the PV. The POD parameters in both control loops are simultaneously optimized so that the power and voltage swings are minimized. Solving the optimization problem by the particle swarm optimization, the optimal parameters of PODs can be automatically achieved. Simulation study demonstrates that the stabilizing performance of the PV with the optimal POD is superior to that of the PV with the non-optimal POD against various power flow levels and severe faults.
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    Active power modulation control of hybrid PV generator-battery for power swing stabilization
    (2016-09-06)
    Pothisoonthorn, Sukanya
    ;
    Ngamroo, Issarachai
    This paper proposes the active power modulation control scheme of the hybrid photovoltaic (PV) generator and battery for power swing stabilization. The battery which is connected to the DC link of the PV generator, is used to smooth the output power fluctuation of the PV generator during normal operation. During faults, the stored energy of battery can be used for the active power output modulation control of the PV generator to stabilize the power swing. By equipping the power oscillation damper (POD) at the active power controller of the PV inverter, the active power output can be modulated to damp the power swing. The POD structure is a practical second-order lead/lag compensator with single input signal. Simulation study confirms the stabilizing effect of the PV with POD.