Wattana Kaewmanee

A dynamic equivalent circuit model for gas diffusion layers of PEMFC

Proton exchange membrane fuel cell (PEMFC) is a device that converts hydrogen and oxygen to electricity. Power electronic converter is an important equipment to transfer energy from PEMFCs to loads properly. The PEMFC model suited for integrating with power electronic circuit simulation are the empirical and the equivalent circuit types. The gas diffusion layer is important part of the PEMFC. This part determines the limit condition of the PEMFC. However, the equivalent circuit model of the gas diffusion layer is not available. This paper proposes a dynamic equivalent circuit model for the GDL and its simulation.

Flatness based control of a dual active bridge converter for DC microgrid

This paper proposes a nonlinear control for a dual active bridge converter (DAB) using properties of flatness system. This converter system is used for a DC microgrid. Losses in the system are modeled as a resistance connected in parallel with the output capacitor. The control algorithm also takes this resistance into account. With a small-scale test bench, bidirectional power flow capability is demonstrated. The effectiveness of the proposed system is demonstrated through experimental results.

Current-fed full-bridge DC-DC converter with nonlinear control scheme

This paper presents a control algorithm for dealing with the constraints of energy power source and a current-fed full-bridge converter. The advantages of this control scheme include transient and steady-state responses and robustness. The prototype of 26 V/100 V 250 W and its controller were implemented. A dSPACE DS1104 was used to implement the outer control loop by using flatness systems properties. An analog control card was employed as an inner control loop by using hysteresis-based PWM. The validation of the proposed control was demonstrated through experiment results.

Current-fed full-bridge voltage doubler DC-DC converter with sliding mode and flatness based controllers for PEM fuel cell

A method to control a current-fed full-bridge converter with voltage doubler and the features of dealing with the constraints of PEM fuel cell (PEMFC) as an energy power source and the voltage imbalance in the output capacitors is presented. The advantages of this control algorithm are the excellent properties in transient and steady-state responses as well as robustness. The outer control loop is controlled using flatness systems properties whereas the inner control loop is controlled using a sliding mode control. The prototype of 26 V/ 200 V 450 W and the mentioned controllers were realized using a dSPACE DS1104. The proposed control was validated via experiment results.

Interleaved Double Dual Boost Converter for Renewable Energy System

This paper presents an interleaved double dual boost converter (IDDB) used in renewable energy application where high voltage gain is required such as fuel cell or photovoltaic applications, etc. Two types of controllers are applied to this converter, 1) a controller based on Flatness properties for regulating the output voltage (outer loop); 2) a sliding mode controller for inductor current (inner loop). The variation of the input voltage is compensated by trajectory planning process. The validation of the proposed system is done through experimental results.

Flatness based control of a dual active bridge converter for a fuel cell application

Based on the properties of flatness system, this paper proposes a nonlinear control for a dual active bridge converter for fuel cell applications. This converter is connected to fuel cell via a diode and an LC low-pass filter. The constraint of fuel cell like the maximum power and current slope are taken into account by means of the control of the energy stored in the filter capacitor corresponding to the fuel cell voltage obtained from its static characteristic. The diode and parasitic resistances are modeled as a series resistance connected to the fuel cell and its value is estimated and is used in the control algorithm. The effectiveness of the proposed system is demonstrated via experimental results.

Study of Interleaved Double Dual Boost Converter for Renewable Energy Source System

This paper presents an interleaved double dual boost converter used in renewable energy application, for example, photovoltaic cell. The converter is interesting because its high voltage gain property. Its operating functions in the possible cases are detailed. Moreover, the presence of negative current in a certain operating point is investigated. The validation of the proposed system is done through experimental results.

2-Phase Interleaved Boost Converter for Renewable Energy Source with Nonlinear Control

This paper presents a two-phase interleaved boost converter with nonlinear control for solar cell applications. The advantage of the interleaved technique is the reduction of the ripple current drawn from the energy sources. Traditionally, to control a DC-DC converter, a linear multiple-loop feedback control technique is often used. In this paper, we propose a nonlinear control technique which is based on Flatness system properties for the voltage loop and a nonlinear control based on sliding-mode for the current loop. The main feature of the used controller is that it can control the converter at any operating point. The validation of the proposed system is demonstrated through experimental results.