Unified Controller Design for Two-Stage Converter Based on Feed-Forward Compensation

2013 ◽  
Vol 732-733 ◽  
pp. 1271-1279
Author(s):  
Tao Xia ◽  
Zhi Chang Yuan ◽  
Yong Xing Li ◽  
Hai Feng Guo ◽  
Bai Hua Zhang
Keyword(s):  
Control Structure ◽  
Controller Design ◽  
Fast Response ◽  
Power Converter ◽  
Two Stage ◽  
Feed Forward ◽  
Modeling Process ◽  
Power Change ◽  
Bus Voltage ◽  
Steady State Performance

A unified control structure for two-stage power converter system (PCS) is proposed which incorporates both charging and discharging modes within the same controller. Detailed modeling process is presented using sub-system approach. Power feed-forward compensation with direct battery current reference is engaged to enable fast response to power change on battery side, thus reducing DC bus voltage fluctuation during transients. Simulation and experiments show that the proposed control structure can effectively improve dynamic response without compromising steady-state performance.

Power Converter Design for Electric Vehicle Applications

2013 ◽  
Vol 67 (3) ◽  
Author(s):  
Aree Wangsupphaphol ◽  
N. R. N. Idris ◽  
A. Jusoh ◽  
N. D. Muhamad
Keyword(s):  
Electric Vehicle ◽  
Power Supply ◽  
Power Supply System ◽  
Controller Design ◽  
Fast Response ◽  
Power Converter ◽  
Supply System ◽  
Matlab Simulation ◽  
Converter Topology ◽  
Bus Voltage

This paper presents the design of a power converter for electric vehicle (EV) applications energized by Li-ion battery (LiB) and supercapacitor (SC). The combination of these energy sources is a good solution for better performances of the EV. A single non-isolated bi-directional converter is proposed in order to get the lowest loss, weight and cost of total electric vehicle applications perspective. The battery voltage represents bus voltage of the power supply system connecting to the load. To control the dynamic of converter, state space averaging technique and power equation linearization are employed to get the transfer function for designing the PI controllers. In order to get the fast response of SC power energizing, the cascade controller is implemented to control current and SC voltage. MATLAB simulation is successfully verified the proposed power converter topology, configuration and controller design for EV. The result shows the capability to settling supply a significant amount of power for step load change within few milliseconds. Sudden load power demand can be drawn from SC. This can reduce the stress of battery as in case of the pure battery power supply system. 

Linear Quadratic Gaussian Optimal Controlled Two-Stage Inverter for a High-Frequency AC Distribution Power System

2011 ◽  
Vol 230-232 ◽  
pp. 1287-1292
Author(s):  
Wei Liu ◽  
Zhi Gang Huang ◽  
Zhong Ning Guo
Keyword(s):  
High Frequency ◽  
Fast Response ◽  
Power Converter ◽  
System Stability ◽  
Linear Quadratic ◽  
Linear Quadratic Gaussian ◽  
Two Stage ◽  
Input Line ◽  
Uncertainty Model ◽  
Wide Range

The linear quadratic Gaussian Optimal control of a two-stage HFAC inverter system has been investigated in this paper. The uncertainty model of the high frequency resonant inverter is developed and analyzed with the input line and load variations taken into design considerations. The proposed control scheme has the advantages of fast response for both input line and load perturbations. It also ensures a wide range of system stability and guarantees robustness of the power converter. Both simulations and experimental results are provided to verify with the theoretical analysis through an experimental prototype with an output power of 500-W operating at 10 KHz and an output voltage of 24 V (peak value).

Uncertainty quantification for aerodynamic pressure probes, using adaptive quasi-Monte Carlo

2021 ◽  
Author(s):  
Alexandros Christos Chasoglou ◽  
Panagiotis Tsirikoglou ◽  
Anestis I Kalfas ◽  
Reza S Abhari
Keyword(s):  
Monte Carlo ◽  
Measurement Model ◽  
Fast Response ◽  
Two Stage ◽  
Detailed Measurement ◽  
Underlying Distribution ◽  
Factors Affecting ◽  
Quasi Monte Carlo ◽  
Measurement Models ◽  
Aerodynamic Pressure

Abstract In the present study, an adaptive randomized Quasi Monte Carlo methodology is presented, combining Stein’s two-stage adaptive scheme and Low Discrepancy Sobol sequences. The method is used for the propagation and calculation of uncertainties related to aerodynamic pneumatic probes and high frequency fast response aerodynamic probes (FRAP). The proposed methodology allows the fast and accurate, in a probabilistic sense, calculation of uncertainties, ensuring that the total number of Monte Carlo (MC) trials is kept low based on the desired numerical accuracy. Thus, this method is well-suited for aerodynamic pressure probes, where multiple points are evaluated in their calibration space. Complete and detailed measurement models are presented for both a pneumatic probe and FRAP. The models are segregated in sub-problems allowing the evaluation and inspection of intermediate steps of MC in a transparent manner, also enabling the calculation of the relative contributions of the elemental uncertainties on the measured quantities. Various, commonly used sampling techniques for MC simulation and different adaptive MC schemes are compared, using both theoretical toy distributions and actual examples from aerodynamic probes' measurement models. The robustness of Stein's two-stage scheme is demonstrated even in cases when signiffcant deviation from normality is observed in the underlying distribution of the output of the MC. With regards to FRAP, two issues related to piezo-resistive sensors are addressed, namely temperature dependent pressure hysteresis and temporal sensor drift, and their uncertainties are accounted for in the measurement model. These effects are the most dominant factors, affecting all flow quantities' uncertainties, with signiffcance that varies mainly with Mach and operating temperature. This work highlights the need to construct accurate and detailed measurement models for aerodynamic probes, that otherwise will result in signiffcant underestimation (in most cases in excess of 50%) of the final uncertainties.

Modeling and Control of an Infinitely Variable Speed Converter With Application to Wind Turbines

2012 ◽  
Author(s):  
W. D. Zhu ◽  
X. F. Wang
Keyword(s):  
Wind Turbine ◽  
Kinematic Model ◽  
Power Converter ◽  
Output Shaft ◽  
Speed Ratio ◽  
Variable Speed ◽  
Average Output ◽  
Constant Frequency ◽  
Current Frequency ◽  
Feed Forward

Traditional transmission in wind turbine applications has a constant output-to-input speed ratio, which needs a power converter to regulate the current frequency that can be fed into the grid. Different types of continuously variable transmission (CVT) have been developed for vehicle and wind turbine applications, which can generate constant-frequency current without using a power converter in a wind turbine. An infinitely variable speed converter (IVSC) is a specific type of CVT that can achieve a zero speed ratio and transmit a large torque at a low speed ratio. An IVSC with drivers that convert an eccentric motion of cams to a concentric motion of the output shaft through one-way bearings is introduced, and an active control system with a combined feedback and feed forward control that can automatically adjust the eccentricity of the outer cams to control the speed ratio of the transmission is developed. The kinematic model of the IVSC is derived and fitted by a polynomial function to serve as the feed forward function in the control law. The feedback control is used to reduce the system error. A dynamic model of the IVSC is derived to investigate the effect of the dynamic load on the input and output speeds. Static and dynamic tests were conducted to validate the kinematic model of the IVSC. The variation of the average output speed per revolution of the output shaft is 0.56% with respect to the desired output speed in the simulation and 0.91% in the experiments.

scholarly journals Asymmetrical ZVS-PWM Switched-Capacitor Based Half-Bridge DC-DC Converter With Switch Peak Voltage of Vin/2

2020 ◽  
Author(s):  
Angelica Paula Caus ◽  
Guilherme Martins Leandro ◽  
Ivo Barbi
Keyword(s):  
Theoretical Analysis ◽  
Power Converter ◽  
Maximum Efficiency ◽  
Switching Frequency ◽  
Switched Capacitor ◽  
Peak Voltage ◽  
Zero Voltage Switching ◽  
Power Switches ◽  
Converter Topology ◽  
Bus Voltage

This paper presents a new power converter topology<br>generated by the integration of the asymmetrical ZVS-PWM dcdc converter with a switched-capacitor ladder-type commutation<br>cell. Circuit operation and theoretical analysis with emphasis on<br>the soft-commutation process are included in the paper. The<br>main advantage of the proposed converter with respect to the<br>conventional asymmetrical half-bridge dc-dc converter is the<br>reduction of the voltage stress across the power switches to the<br>half of the input dc bus voltage, enabling the utilization of lower<br>voltage rating components. Experiments conducted on a<br>laboratory prototype with 1.4 kW power-rating, 800 V input<br>voltage, 48 V output voltage and 100 kHz switching frequency<br>are included, to verify the theoretical analysis and the design<br>methodology. The maximum efficiency of the experimental nonoptimized prototype was 93.6%.<br>Index Terms - Asymmetrical dc-dc converter, pulse-widthmodulation, switched-capacitor, zero voltage switching.<div><br><br></div>

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