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One of the important role for dc-dc converters is to regulate output voltage against the transient variation of input voltage. Recently, renewable energy becomes popular and renewable power generators are connected to the dc power grid directly, dc bus voltage is affected from them. Therefore, the improvement of the transient response against the variation of the dc bus voltage is required to control...
This paper presents an adaptive slope compensation method for peak current mode control of digital controlled DC-DC converters, which controls the quality factor of the complex conjugated poles at half the switching frequency. Using quality factor control enables optimization of the dynamic performance and stability of current mode control. The presented method adapt to DC-DC converter operating conditions...
Most control papers related to variable speed drives are focused on the current and torque control of the electric machine. However, the slower outer loop is also very important. This considers the control of a variable parameter resonant rotating load using a novel control algorithm called Local Vector Control (LVC). Resonant loads naturally occur in, for example, building elevator applications....
In this paper, a high performance fully digital peak current mode controller for DC-DC converters which supports the full duty cycle range from 0–100% is presented. Support for low duty cycle is very important during short circuit or converter overload and support for high duty cycle is important for faster response during a transient and for providing a larger output voltage range. The digital current...
This article is going to describe the design and implementation of a non-inverting buck-boost converter for lithium-ion battery chargers. The described modulation strategy allows to achieve a high efficiency and high power density converter. The prototype is made up of off-the-shelf components and the elaborated current predictive control algorithm avoids the use of a current sensor. Only voltage...
This paper compares the design and performance of two controls for half-bridge converters with LCL output filters based on Virtual Circuit Design method, which is an intuitive way to achieve desired closed-loop behaviours as well as resonance damping and low-frequency behaviours. The first control is represented by a circuit employing a resistor in series with a converter-side inductor to stabilize...
The paper objective is to propose an innovative power converter topology combining the advantages of capacitor discharge and switch-mode converters to generate half sinusoidal fast current pulses with high precision. The capacitor discharge operation mode of the converter allows the generation of current pulses with fast transient response and the switch-mode operation enables the control of the pulse...
This paper presents the implementation and dynamic analysis of synchronous frame current regulators for Modular Multilevel Converters (MMC) using complex vectors. This includes the design of the Decoupling Physical Input Cross-Coupling (DPICC) for MMC-topologies. With this, the set of differential equation of the MMC can be transformed into the same format that is used for virtually every other Voltage...
This paper presents a dc-link voltage control for a three-phase PWM rectifier that combines an adaptive PI controller with a feed-forward of the load current which is estimated through a Luenberger observer. A systematic design approach is presented for the adjustment of the adaptive PI and the observer gains. Several simulation and experimental results are presented and discussed in order to show...
The digital control has the attractive capability, for instance, the high-performance function and the energy management capability. On the other hand, there are issues which must be solved for the actual implementation. The proposed method can solve some of them, namely the transient response, the dynamic characteristics and the precision of the controller, with the simple method.
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