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This paper proposes the finite control set applied to the current control of an interleaved boost converter of photovoltaic systems. The proposed controller select the state of the converter semiconductor by using the predicted behavior of the converter and the minimization of a cost function. Hence, the controller guarantees that the current reference is reached. The current reference is computed...
A switchable tunable dual-band filter using varator diodes for band switching and frequency tuning is proposed. The tuning range of first band is from 2.3 to 2.8 GHz and second one is from 1.8 to 2.1 GHz. The proposed dual-band filter is composed of two second-order Chebyshev short-ended hairpin comb filters which embedded a pair of the varators as a switching and tuning elements. The simulated and...
In modern distributed energy systems (DES), there is a shift in focus from conventional centralized approach to more advanced distributed architecture. Modeling and analysis of these complex systems is more challenging, as multiple energy sources are connected with different loads through power electronics converters. Due to vastly different dynamic characteristics of these converters, it is necessary...
In this paper a novel and fast open-circuit fault detection and localization method is proposed for Five-level active-neutral-point-clamped (5L-ANPC) converter. The method is based on comparing the measured output voltage with the reference voltage and the voltage obtained from the fault analysis. The implementation scheme of the method is presented; and all the practical aspects including capacitors...
Droop control is widely used in distributed generators for relating their terminal parameters to power generation. These generators are usually assumed to have enough capacities for supplying the required power. This is however not always true, especially with renewable sources with no or insufficient storage. To deal with this issue, an improved droop-based control is proposed for single-phase two-stage...
This paper investigates nonlinear control methods for single-ended primary-inductor converters (SEPIC). The fast-switching and average models show the converter nonlinearity in terms of inductor currents, capacitor voltages, and the switching duty cycle. The control law intuitively should be nonlinear to drive and guarantee the system stability. Two different control laws based on the passivity and...
Parallel inverters are commonly adopted in high power applications, for instance wind energy system, smart transformer, and power conditioners. Meanwhile, interleaved PWM is usually considered as an optimal approach to reduce the current ripple and harmonics of the parallel inverters. However, in case of a common dc-link, the problem of circulating current emerges and leads to performance degradation...
1700V SiC modules were built with next-generation SiC MOSFETs, with 25°C RDSON per MOSFET cut approximately 50% from existing commercial SiC MOSFETs. Additionally, the external SiC anti-parallel diode was eliminated in favor of using the SiC MOSFET body diode during the dead time. The resulting 1700V SiC module used only 32% of the SiC chip area, yet reduced the 25°C module RDSON from 8mΩ to 5mΩ,...
Recently, with research and development of SiC power devices, 1.2 kV SiC MOSFETs have become commercially available. The parasitic parameters, such as output capacitance, in each power device are not identical, because they depend on the device structure and material properties. Therefore, voltage sharing of turn-off operations under series-connection conditions of the power devices may be affected...
In this paper, a new control method for capacitive link universal power converters is proposed to eliminate the need for measuring the output and input voltages. Capacitive link universal converters are a new class of power converters that offer high power density and reliability, and are capable of transferring power between any type of source and load, dc or ac, with any number of phases, emerges...
The permanent-magnet (PM) motors are widely used in many industrial drives. Accurate knowledge of machine parameters, such as inductance is essential for efficient and optimal control of the machine. There are numerous methods proposed in the literature for online as well as off line learning of machine parameters. They differ in accuracy and measurement techniques. This paper proposes an online measurement...
The on-state resistance Ron of GaN devices can be affected by charge trapping as well as temperature effects. For the reliable application of the devices it is useful to distinguish between these two effects and understand the cause of power losses. In this work, three state-of-the-art GaN power transistors are investigated. An obvious Ron increase by trapping occurs in the GaN normally-off devices,...
Vertical GaN power semiconductors promise higher power with faster switching speeds but the development of this technology has been slowed. This is due to the expense and lack of familiarity with GaN substrates. This paper will detail the functionality of HRL's cutting-edge vertical GaN transistor which is mounted onto a specially made PCB and tested. The testing consists of a static characterization...
Fault tolerant operation can significantly improve the reliability of a Modular Multilevel Converter (MMC), but the precondition is that a fast and accurate fault detection and localization method has been embedded into the MMC control system. This paper proposes a fault diagnosis method used in a distributed control architecture, which makes the local controllers capable of identifying the switching...
In this paper, a method to diagnose and identify the open-circuit faults of IGBT for a six-level hybrid inverter (6L-HI) is proposed, which is based on the signals of the inner device voltages, the flying capacitor voltages and the phase currents of the inverter. Since the flying capacitor voltage sensors and the output current sensors are already employed for the inverter operation, only one additional...
A predictive control scheme for the third-harmonic injection two-stage matrix converter (3TSMC) under unbalanced input voltages is presented. The proposed scheme is designed to predict the future behavior of the third-harmonic injection current and load currents respectively for each valid switching state. The control scheme selects the state that minimizes the error between the predicted currents...
Considering that the information uploaded by fault indicator devices is often lost or wrong in actual operation, a fault diagnosis method for distribution networks based on multi-source information is developed in this paper. The multi-source information includes information from distribution automation terminals and the customer electric information acquisition system (CEIAS). Firstly, using the...
The detection of the fundamental frequency and phase angle of the positive sequence grid voltages are utmost necessary for the proper operation of controlled active power converters, which require to operate stable and robust even during the presence of diverse power quality issues. There exist various utility grid synchronization and detection methods based on Phased-Locked Loop (PLL) techniques...
Post-arc current significantly influences the interrupting process of breakers, which can reflect the appearance of the arc before current zero and the residual metal vapors in electrode distance after current zero. In order to investigate the characteristics of post-arc current in DC interruption, a high speed hybrid actuator was designed, and forced current zero method was used to carry out the...
A CMOS fully-integrated Coulomb counter based on a voltage-to-frequency conversion algorithm that measures the state-of-charge (SoC) of a high-density Li-ion battery is presented. Low-side current sensing with a polarity detector is used to monitor the charging and discharging battery current. It is designed in 0.35 μm CMOS process and occupies an active area of 0.01mm2. Except for the sensing resistor...
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