scholarly journals Practical Controller Design of Three-Phase Dual Active Bridge Converter for Low Voltage DC Distribution System

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2101
Author(s):  
Hyun-jun Choi ◽  
Won-bin Lee ◽  
Jee-hoon Jung
Keyword(s):  
Distribution System ◽  
Controller Design ◽  
Low Voltage ◽  
Frequency Noise ◽  
Small Signal ◽  
Signal Model ◽  
Dual Active Bridge ◽  
Small Signal Model ◽  
Three Phase ◽  
Output Filter

In a low voltage DC (LVDC) distribution system, isolated bi-directional DC-DC converters are key devices to control power flows. A three-phase dual-active-bridge (3P-DAB) converter is one of the suitable candidates due to inherent soft-switching capability, low conduction loss, and high-power density. However, the 3P-DAB converter requires a well-designed controller due to the influence of the equivalent series resistance (ESR) of an output filter capacitor, degrading the performance of the 3P-DAB converter in terms of high-frequency noise. Unfortunately, there is little research that considers the practical design methodology of the 3P-DAB converter’s controller because of its complexity. In this paper, the influence of the ESR on the 3P-DAB converter is presented. Additionally, the generalized average small-signal model (SSM) of the 3P-DAB converter including the ESR of the capacitive output filter is presented. Based on this model, an extended small-signal model and appropriate controller design guide, and performance comparison are presented based on the frequency domain analysis. Finally, experimental results verify the validity of the proposed controller using a 25 kW prototype 3P-DAB converter.

Divided DQ Small-Signal Model: A New Perspective for the Stability Analysis of Three-Phase Grid-Tied Inverters

2019 ◽  
Vol 66 (8) ◽  
pp. 6493-6504 ◽  
Author(s):  
Zhikang Shuai ◽  
Yang Li ◽  
Weimin Wu ◽  
Chunming Tu ◽  
An Luo ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Small Signal ◽  
Signal Model ◽  
Small Signal Model ◽  
Three Phase ◽  
New Perspective ◽  
The Stability

scholarly journals Small-Signal Modeling of PMSG-Based Wind Turbine for Low Voltage Ride-Through and Artificial Intelligent Studies

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6685
Author(s):  
Mojtaba Nasiri ◽  
Saleh Mobayen ◽  
Behdad Faridpak ◽  
Afef Fekih ◽  
Arthur Chang
Keyword(s):  
Wind Turbine ◽  
Low Voltage ◽  
Voltage Drop ◽  
Small Signal ◽  
Signal Model ◽  
Artificial Intelligent ◽  
Low Voltage Ride Through ◽  
Small Signal Model ◽  
Proposed Model ◽  
Intelligent Methods

In recent years, due to the several advantages of permanent magnet synchronous generator (PMSG), the number of wind farms utilizing this technology has been significantly grown. The determination of the failure mechanism in these devices is the major challenge which has been addressed in many studies. Particularly, response to grid code compliance by wind power in the voltage drop situation needs to be comprehensively analyzed. In this paper, a small signal model of a PMSG-based wind turbine for low voltage ride-through (LVRT) and suitable for stability and artificial intelligent studies is presented. Accordingly, the generator side converter controls the dc-link voltage, and the maximum power point tracking is performed by the grid side converter. Given the proposed model, the speed of the simulation for stability analysis studies can be significantly increased by intelligent methods. Furthermore, the simplified approach can be achieved for calculating the optimal coefficients of the proportionality-integral controller by intelligent methods in a short time. By simulating the proposed small-signal model and comparing it with the block-based simulation in MATLAB/SIMULINK software, the appropriate accuracy and efficiency of the proposed model are confirmed.

scholarly journals Small-Signal Model for Dual Active Bridge Series Resonant DC-DC Converters with Variable-Frequency and Phase-Shift Modulation

2019 ◽  
Vol 37 (4) ◽  
pp. 830-837
Author(s):  
Weijian Han ◽  
Ruiqing Ma ◽  
Qing Liu
Keyword(s):  
Phase Shift ◽  
Closed Loop ◽  
Variable Frequency ◽  
Stable Operation ◽  
Small Signal ◽  
State Variables ◽  
Signal Model ◽  
Dual Active Bridge ◽  
Small Signal Model ◽  
Series Resonant

Variable frequency and phase shift modulation can achieve zero-voltage switching (ZVS) of dual active bridge series resonant DC-DC converters(DABSRCs) over a wide operating range so as to effectively improving system efficiency and reliability. In order to study the dynamics of DABSRCs and provide the basis for the closed-loop compensator design, a continuous-time small-signal model is proposed. The generalized average modelling approach is adopted, in which the DC component of the output voltage and the fundamental component of the inductor current and resonant capacitor voltage are selected as the state variables, precisely describing impacts of the resonance on the system dynamics. On the above-mentioned basis, a closed-loop compensator is designed, which achieves the stable operation with the ZVS variable frequency and phase shift modulation. The analysis results are verified by the simulation and experimental results.

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