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This paper investigates the fundamental characteristics of contactless power transfer in seawater. The influence of seawater on contactless power transfer via magnetic resonant coupling method is experimentally examined. The experimental results show that the transmission efficiency decreases about 5% in seawater compared to that of in air.
A circulating current is a major problem introduced by directly connecting voltage source inverter (VSI) in parallel. This circulating current occurs as a zero-sequence current between the inverters by specic switch states. Its alternatives were presented by hardware and software methods in many papers. When coupled inductor (CI) are employed for the high frequency circulating current, a circulating...
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...
A single-phase quasi-impedance source inverter (qZSI) has become an attractive solution for residential PV applications. However, due to the nature of this inverter topology, double-frequency (2ω) power ripple issue should be considered since this issue has a negative impact on the system performance. This paper presents model predictive control (MPC) based current ripple damping control technique...
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...
Reliability is one of the key features that is sought after in converter design. Electrolytic capacitors are the most common capacitor type in switching mode power supplies to be used as a DC bus energy storage. However, electrolytic capacitors are known to degrade due to aging. This paper introduces a capacitance degradation detection method for a step-down DC-DC converter that is based on introducing...
The current controller sets the base of the dynamical performance for drives running flux oriented control. In the literature, can be found different approaches used for the classical linear dq-current control. This paper has as aim a theoretical and practical benchmark of the diverse types of linear controllers suitable for drive application. There are evaluated different properties like: dynamical...
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...
A control algorithm for an integrated power factor correction (PFC) and series resonant converter (SRC) using only two switches is presented, allowing to open loop control the AC input current and the DC output current independently. The theory for this approach is analyzed in time domain and a novel approach for open loop regulation is presented and verified. The software defined power (SDF) control...
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 multilevel converters have advantages of low voltage stresses of the switches and possible reduction of size of the passive components. Input-series output-series (ISOS) configuration of the converter enable the utilization of low voltage rating switches in converters with high input voltage and high output voltage in applications that requires galvanic isolation. While multilevel topology offers...
In the past few years, the interest in model predictive control (MPC) for power electronics has increased significantly. It proves to be a good alternative to space-vector modulation at low switching frequencies. It has been shown that an increase in the prediction horizon improves the system performance. Unfortunately, increasing the horizon leads to an exponential increase in the complexity of the...
This paper analyzes the dynamic performance of FOC induction machines operating under current and voltage constraints. FOC rely on the proper performance of the inner current control loops. The capability of the machine to increase its torque can be seriously compromised due to the inverter voltage and current limits, which affect to the current regulator transient response. This can be especially...
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...
A three-channel interleaved Power Factor Correction (PFC) based on a new digital controller STNRGPF01 [7] operating in Continuous Conduction Mode (CCM) is presented in this paper. The control structure is based on a mixed signal concept where the time critical functions such as input current control and fast over current protections are performed using analog parts. All the non-time critical functions,...
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...
400 Hz inverters, known as Ground Power Units (GPUs), are widely used in aviation and marine industry. Due to their approximately eight times higher fundamental frequency, 400 Hz inverters are much more sensitive to practical delays such as sampling delays, when compared to traditional 50–60 Hz inverters. Conventional controllers designed for 50–60 Hz inverters, therefore, must be redesigned to properly...
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