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In this paper, given the desired peak power requirement of the solar photovoltaics (SPV) power plant, computation of parameters of mathematical model of the SPV module along with aggregation parameters are considered. The SPV module model parameters are estimated by adjusting it to nonlinear current-voltage(I-V) equation at the three notable points on the I-V curve, which are provided by all commercial...
Non-linear solar photovoltaic (SPV) system characteristics and its dependency on meteorological variables of irradiance and temperature; renders this energy source rather involved to visualize. In this paper a low power realtime SPV module simulator is realized in field programmable gate array (FPGA) XCS100E platform for classroom teaching. FPGA platform is used due to its parallel computing nature...
This paper presents the design and steady-state analysis of a Fixed Capacitor-Thyristor Controlled Reactor (FC-TCR)-based Static VAr Compensator (SVC). Reactive power compensation is demonstrated through the fundamental frequency analysis of the samples acquired from the designed system. The performance of the SVC in the presence of line reactance is also discussed. National Instrument (NI) based...
In this paper, the interfacing of the type-1 wind turbine employing double cage induction generator to the grid is presented. Rotor instability performance of this system is studied and a detailed comparison is done with the single-cage. Steady-state torque-speed characteristics are compared and the results are validated through transient and eigenvalue analysis. The effect of wind turbine characteristics...
In this paper, the IEEE-specified generator models such as the equivalent circuit (EC) models and the operational inductance (OI) models are compared to analyze the influence of the differences in the standard transfer functions among these models on the large-disturbance rotor-angle stability (or transient stability) of the power system. The large disturbances such as unsymmetrical and symmetrical...
In this paper, the dynamic modeling of a doubly-fed induction generator-based wind turbine connected to infinite bus (SMIB) system, is carried out in detail. In most of the analysis, the DFIG stator transients and network transients are neglected. In this paper the interfacing problems while considering stator transients and network transients in the modeling of SMIB system are resolved by connecting...
In recent years, penetration level of the grid-connected renewables has been increasing. These grid integration, affects the steady state as well as dynamic behavior of the power system network. In this paper, the conventional loadflow programme is modified to accommodate grid-connected solar photovoltaic (SPV) power system. A model of SPV-integrated power system is developed to carry out large-signal...
In this paper, the influence of HVDC links in interconnected power systems to prevent loop flow, is analysed. To enable this, a two-terminal HVDC link has been modelled in FDLF-based conventional power flow programme. The results of the case studies are presented using a 10-bus two-area modified power system and a 14-bus the IEEE test system, by replacing the AC lines by HVDC links with power-reference...
In this paper, a conventional powerflow programme is modified to accommodate solar photovoltaics (SPV) power systems with series power injections. This approach facilitates inclusion of the SPV non-linear equations within main loadflow iteration process, demanding less computational efforts. In this programme, in addition to series reactive power specification, bus voltage control strategy can also...
In this paper, a dynamic phasor-based continuous-time model of thyristor-controlled series capacitor (TCSC) has been used to obtain the phase-response characteristic of a system, analytically. This in-turn enables the usage of the well-known phase compensation technique to design a supplementary subsynchronous damping controller (SSDC). It is found that at higher series compensation levels, the design...
In this paper a procedure to estimate the effective resistance of a non-ideal inductor which is used to build a laboratory TCSC is presented. Having estimated the effective resistance, its influence on the performance of the TCSC is studied, not only through PSCAD/EMTDC-based simulation, but also by capturing the waveforms from the experimental setup. Further, a current controller is implemented on...
With the increasing energy demand and larger interconnections between systems, the loop flow problems may arise naturally limiting the reliable system operations. FACTS Controllers, such as TCSC, SSSC and TCPAR, have the ability to control the power flow, which make them utilize for preventing loop flows in interconnected systems. This aspect has been studied in this paper. The modeling of FACTS controllers...
In this paper, the basics of dynamic phasor (DP) modelling has been introduced by employing a simple RL-series circuit. In the example, the actual time-domain simulation and the DP-based simulation are presented in addition to the eigenvalue analysis of the RL-circuit in the DP-domain. With this introduction, following a systematic procedure, the DP-model of a static VAr compensator (SVC) which involves...
In this paper, performance analysis of a grid connected DFIG for non-optimum power tracking is carried out. In most of the analysis an optimum value of power tracking is assumed. In this paper a variant of load flow technique with DFIG is presented where the power coefficient can be specified different from the optimal value. Newton-Raphson (NR) technique has been employed to embed the DFIG circuit...
This paper presents a toy- model to demonstrate the concepts of torsional interactions that occur during the subsynchronous resonance (SSR) problem in power systems.The content of the paper evolves as a tutorial and motivates a novice to take up SSR studies on relatively complex systems such as the IEEE first and second benchmark systems which contain many intricate modal interactions. To show the...
In this paper the use of an arbitrary waveform generator to generate desired signals in real-time is illustrated by simulating an induction motor operation along with various starting techniques. An off-line digital simulation of an induction motor is carried out on MATLAB/SIMULINK. The resulting sample-data files pertaining to signals such as electromagnetic torque and rotor speed are used in the...
In this paper, performance details of a thyristor controlled series capacitor (TCSC) implemented in a laboratory environment, are presented. The setup is not only simple, but also uses an open-source Linux-based real-time application interface (RTAI) software to realize a phase locked loop (PLL). With this PLL, the performance of the TCSC for the capacitor voltage and the line current reference signals,...
In this paper, rotor stability performance details of a grid connected type-1 wind turbine generator (WTG) system are presented. Small-signal and transient stability analyses are carried out including the models of the turbine-generator shaft system to show that the torsional modes natural to the shaft system gets excited only when the system exhibits rotor speed instability. This observation will...
This paper presents the implementation of a phase locked loop (PLL) using Real-Time Application Interface (RTAI) on Linux platform. This PLL has been employed to generate firing pulses for gating the thyristors of a thyristor controlled series capacitor (TCSC) developed in the laboratory. The working of the TCSC in the capacitive vernier mode is depicted through a set of oscilloscope plots. A detailed...
In this paper, type-1 wind turbine generator (WTG) connected to the grid system is analyzed. The phenomenon of rotor speed instability is brought out clearly and it is explained with the help of torque-speed characteristic. It is also shown that if the WTG is made to deliver a load power below a certain value, then the system remains always stable. In addition, case studies are presented to demonstrate...
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