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    Adaptive Output Power Smoothing of Grid-Connected Hybrid Wind-Photovoltaic by SMES
    (2020-10-16)
    Pahasa, Jonglak
    ;
    Ngamroo, Issarachai
    This paper proposes an adaptive output power control of superconducting magnetic energy storage (SMES) to solve the output power fluctuation problem of the grid connected hybrid permanent magnet synchronous generators (PMSG) wind and photovoltaic generations (HWPV). By the power control of SMES, the adaptive output power reference is employed to achieve the desired output power of the HWPV while the variation of SMES coil current is regulated between the minimum and maximum limits. Study result shows that the proposed adaptive power control of SMES is able to alleviate the HWPV output power fluctuation, and maintain the SMES coil current in the acceptable range effectively.
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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.
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    Integrated superconducting coil into PV generator for power smoothing and voltage regulation
    (2016-04-15)
    Kreeumporn, Worapong
    ;
    Ngamroo, Issarachai
    At present, the installation of PV and plug-in hybrid electric vehicles (PHEVs) tends to increase significantly in the power distribution system. The PV power output varies due to the weather condition while the battery charging in PHEVs causes the voltage fluctuation. To smooth the PV power and regulate the voltage, this paper focuses on the new application of superconducting coil (SC) which is integrated into the photovoltaic (PV) generator. The SC is connected to the DC side of the PV generator via a DC-to-DC converter. With the proportional integral (PI) controls for the DC-to-DC converter of the SC and the inverter of the PV, the stored energy in the SC can be controlled to smooth the PV power and suppress the voltage fluctuation. Simulation results show the effectiveness of the PV with SC in comparison with the PV without SC.