Ngamroo, Issarachai
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Preferred name
Ngamroo, Issarachai
Alternative Name
Ngamroo, I.
Main Affiliation
Email
issarachai.ng@kmitl.ac.th
71 results
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Item type:Publication, Robust power oscillation damper design for DFIG-based wind turbine(2013-09-02); ; Nakawiro, WorawatA new robust power oscillation damper (POD) design for a doubly fed induction generator based- wind turbine is proposed in this paper. The POD structure is specified by the second-order lead/lag compensator with single input signal. The parameters optimization of POD is formulated based on a mixed H<inf>2</inf>/H<inf>∞</inf> control using linear matrix inequalities. The POD parameters are optimized by the firefly algorithm so that the damping performance against system disturbances and the robustness under system uncertainties are satisfied. Simulation results in a single machine infinite bus confirm the superior robustness of the proposed POD over the conventional POD. © 2013 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Transient stabilization of power swing by controllable PV farm equipped with optimal fuzzy gain scheduling of PID controller(2014-10-15) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Wide area robust centralized power oscillation dampers design for DFIG-based wind turbines(2014-02-10); 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Coordinated control of DFIG wind turbine and SVC for robust power system stabilization(2015-08-17) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Robust pitch controller design in hybrid wind-diesel power generation system(2008-09-23); ; ; Hashiguchi, T.In this paper, the robust control design of pitch controller for frequency control in a hybrid wind-diesel power generation system is proposed. The structure of the pitch controller is a 1<sup>st</sup>-order lead-lag compensator. To take system uncertainties into account, the coprime factorization is applied in system modeling. To obtain the controller parameters, the performance and stability conditions of H<inf>∞</inf> loop shaping technique are used to formulate the optimization problem. The genetic algorithm is employed to solve the problem. Simulation studies show the frequency control effect and robustness of the proposed controller against system uncertainties in comparison with a variable structure pitch control. ©2008 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A photovoltaic generator with superconducting coil for subsynchronous resonance damping(2018-12-04)The critical problem of the series capacitor compensation is the subsynchronous resonance (SSR) which causes the torsional oscillation in the generator-turbine system. To damp the oscillation, this paper focuses on an application of superconducting coil (SC) embedded into the photovoltaic (PV) generator. The DC chopper is used to interface the SC with the DC side of the PV inverter. The SSR damping controller is added to the active power control loop of the PV inverter. As a result, the stored energy in the SC can be suitably controlled so that the active power output of PV can be adjusted to damp out the torsional oscillation. Study results confirm the SSR stabilizing effect of the PV with internal SC. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optimal tuning of power system stabilizers by probability method(2016-09-06); Nakawiro, WorawatIt is well known that the power system stabilizer (PSS) which is designed at one operating point cannot guarantee the stabilizing effect of PSS over a wide range of operating conditions. To achieve the PSS with high stabilizing performance against various conditions, this paper focuses on the new parameters optimization of PSS by the probability method. The PSS structure is the practical 2<sup>nd</sup>-order lead-lag compensator with the local input signal. The optimal tuning of PSS parameters is carried out under random operating conditions generated by Monte Carlo method so that the probability of the occurrence of desired damping ratio for target oscillation modes are maximized. The particle swarm optimization is used to solve for optimal PSS parameters. Study results in the IEEE-39 bus New England system confirm that the proposed PSS yields better damping effect than the conventional PSS under various operating conditions and severe faults. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Adaptive Output Power Smoothing of Grid-Connected Hybrid Wind-Photovoltaic by SMES(2020-10-16) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Test results of evaluating eigen-characteristics of interarea power swing mode derived from PMU data in Thailand system(2007-12-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Active power modulation control of hybrid PV generator-battery for power swing stabilization(2016-09-06)