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In this paper, the reaction kinetics of the selective catalytic reduction (SCR) is briefly introduced, and a non-cell mathematical model describing the thermal and chemical process of the SCR catalytic converter is given. Based on the one-cell model, identical SCR cell models can be seriously connected to simulate a real SCR converter performance. Consequently, the SCR catalytic converter model in...
A small-signal model is used to design the controller parameters of the conventional Power Factor Correction (PFC) converter. The dynamics of the converter is nonlinear, therefore, it is hard to derive desirable performance. Genetic algorithm is used to optimize the control parameters of PFC converter in this paper, by this way, the quasi-optimal control parameters can be obtained with the predefined...
Three-phase high-power rectifier has widely applied to electromotor and high-power AC-DC transformation, but there are many problems such as many harmonic waves and low power factor about high-power rectifier. Along with much request of green electrical source, it is more and more important to reduce its disturbance to electrical network. High-frequency PWM rectifier can adjust output voltage and...
This paper presents a Matlab/simulink model of grid-connected photovoltaic (PV) system, including a PV array, a control system, a distribution network and a load. Based on the accurate modeling system, optimum control and stability analysis are studied. The current control strategy can regulate the current at the point of common coupling to achieve the power factor control. The voltage control strategy...
The Flywheel Energy Storage System (FESS) based on the Z-source inverter is proposed in this paper. The proposed system can boost and generate a desired output voltage efficiently when low voltage of the generator is introduced due to the low flywheel speed. The topology of the system is introduced and the control strategies for the system are analyzed. Z-source inverter, which is used in Flywheel...
The operation principle of peak current mode control H bridge converter was analyzed. It can observe nonlinear phenomena in H bridge converter after simulating to the model, which builds by the concept of binary logic variables using Matlab/Simulink. According to the characteristics of H bridge converter, a time-delayed feedback control method was applied to suppress the chaos behavior of H bridge...
Photovoltaic (PV) system is composed of several elements as solar cells, boost converter, inverter and load. Owing to the existence of converters, photovoltaic system is a hybrid system contains continuous dynamic and discrete dynamic. Traditionally, the power electronic converter is difficult to model. This paper illustrates the modeling method of hybrid system, especially finite automata model....
Photovoltaic (PV) system is composed of several elements as solar array, boost converter, inverter and load. The solar array should be integrated with a dc-dc converter and a control algorithm to perform a search to track the maximum power continuously. We adopt perturbation and observation method to implement Maximum Power Point Tracking (MPPT) for solar cells. Owing to the existence of converters,...
The hardware configuration and control methodology for a test bench for power grid simulations for multi-MW wind energy applications are described. The variable voltage is generated using two (four in the final stage) medium voltage, three-phase, three-level voltage source converters with press-pack insulated gate bipolar transistors and a specially designed step-up transformer. This system differs...
In this paper, a novel topology of APFC with on-line half-bridge UPS controlled by DSP is presented. The operation principle is analyzed. In order to improve the dynamic response feature of APFC and make the design of LC filter easy, improved current hysteretic control is proposed. A digital control scheme based on DSP is presented. The control model of APFC is simulated with Matlab. In order to verify...
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