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The parallel connection of power electronic converters has had an increasing demand due the need of higher power. A desired feature in these connections is equal and stable current sharing among the converters. However this is not possible in real systems where factors as aging or heating cause mismatch in the parameters. This paper presents a passivity-based controller design which achieves equal...
A buck converter is a very common choice for non-isolated offline LED applications, using peak current regulation. The problem for peak current regulation is that the average current of the LED string will vary with different numbers of LEDs. This paper presents two simple and cost effective ways to compensate the average current variation without losing the simplicity of peak current regulation.
In this paper, a digital charge balance controller is presented which is capable of controlling a Buck converter and an auxiliary circuit to achieve an excellent unloading transient response. The auxiliary circuit significantly reduces the voltage overshoot caused by an unloading transient while the digital charge balance controller reduces the settling time of the converter. The controller is capable...
This paper proposes a dynamic model and control strategy for the voltage source converter based high voltage direct current transmission (VSC-HVDC) under fault AC conditions. After simplify the equivalent circuit of the VSC transmission system, a VSC-HVDC electromagnetic transient model which considering the loss of the phase reactors has been built. To restrain the DC voltage double line-frequency...
This paper presents a controller with duty-cycle dynamic distribution within parallel-connected PFC converters based on average-current control strategy, which can distribute the control duty-cycle automatically for each parallel-connected PFC converter to realize current balance by the difference from its reference current, and it can decrease and even eliminate the disturbance resulted by current-balancing...
An interleaved current-fed full-bridge converter has the capability to step up the voltage while maintaining a low input current ripple. Therefore, it is suitable for application such as a front-end converter for fuel cell where the source current ripple has to be small. However, since the source voltage varies with change in load profile, it is a challenge to design a stable controller that works...
Paper addresses new advances in intermediate bus architecture in its historical perspective as further improvement of distributed power system for tele- and data communication equipment. The modern requirements to intermediate bus converter and its design challenges are addressed in details. Experimental data for bus converter using advanced control approach are provided.
There are many analyses on the closed-loop performance for COT buck converters. But all of them assume the absence of the multiple pulsing effect, which will increase the output voltage and inductor current swing significantly, and a poor steady state performance is as a result. This paper presents a time domain analysis for COT buck converters to show the relationship between the multiple pulsing...
A passivity based control scheme is applied to a buck converter operating as an active power factor corrector. The converter is modeled via an Euler-Lagrange (energy) approach and two control laws are derived from this non linear model: a direct control (using the voltage in the capacitor) and an indirect control (via the current in the inductance current). The resistive load impedance is estimated...
In this paper is studied the single-phase two-cell multilevel cascade H-bridge power converter connected to the grid, acting as a synchronous rectifier. The power exchange process between the cells of the converter and the grid is analyzed. Based on this analysis and on the power converter model the stages of the controller design process are shown. A new controller for the cascade power converter...
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