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In this paper, models of central-station PV plants, are represented. The detailed and equivalent PV models and area of their applications and limitations for different studies (load flow, short circuit calculation, RMS modeling and harmonic analysis) are proposed. Levels of detailing from one node to in-depth model of PV plant are overviewed.
This paper introduced circuit principle and control method of a new type of series-parallel UPS. Through the waveform of output voltage and current, Simulated by Matlab7.0, the results verify that circuit principle and control method are feasible. Also, this paper analyzes the circuit can reduce the switching losses and improve the efficiency of the superiority of the machine in case of mains power...
Most traction substations are equipped with 12-pulse passive rectifiers. Therefore, Total Harmonic Distortion (THD) of the input current is high, and feedback of braking power into the grid is not possible. Also, the overhead line voltage fluctuates seriously with varying loads. Imtech has developed a bidirectional supply for traction substations based on IGBT technology. The power electronics consist...
Based on the mathematical model of the current source inverter (CSI) in the stationary alphabeta frame, this paper proposes advanced stationary frame voltage control methods for CSI with linear and nonlinear loads to achieve zero steady-state error respectively. The voltage control strategy based on a special resonant controller for CSI with linear loads is firstly analyzed in detail, on the basis...
The principles and technologies of var compensation implemented with static capacitors, static Var compensator and static Var generator are concisely presents. The simulation and study for these methods are made. These methods' merits and faults are also compared through the wave analysis after simulation. It is shown the SVG is even more advantageous to dynamically improve voltage regulation, stability,...
This paper proposes a method to minimize the inverter ripple by active compensation of the low frequency harmonics using a buck current source with a bang-bang control. Remain power spectrum is spreading by chaotification of the buck voltage source command using a nonlinear transfer function for the control loop. Simulation results and designing methodology are presented.
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
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