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In order to solve the conventional direct torque control contradiction between the dynamic and static performance, a permanent magnet synchronous motor system direct torque control architecture is proposed based on space vector modulation strategy. In this method flux and torque are controlled through stator voltage components in stator fluxlinkage coordinate axes and space vector modulation is used...
Recent years, multilevel inverters have become more attractive for researchers due to low total harmonic distortion (THD) in the output voltage and low electromagnetic interference (EMI). This paper proposes a three-phase cascaded H-bridge quasi-switched-boost inverter (CHB-qSBI). The advantages of the proposed inverter are as follows: buck-boost voltage with single stage power conversion, reduced...
This paper discusses the dead-time effect of dual bridge series resonant DC/DC converter (DBSRC). The phase-shift modulation is usually adopted in DBSRC. However, the phase-shift angle is usually small, and voltage polarity reversal (VPR) may occur in dead-time, which may deteriorate EMI/EMC and increase loss. This paper analyzes the commutation of DBSRC when VPR occurs and proposes a method to eliminate...
In order to reduce the ripple of DC-link voltage and capacitor current, this paper presents a method to select suitable capacitance for the rectifier (full-wave controlled) and inverter. Meanwhile, a braking unit is developed to prevent the overvoltage of DC bus. The impact of the length of cable, connected between the braking unit and the inverter, is researched from a mathematical point of view...
The semi-controlled open-winding permanent magnet synchronous generation system with a common dc bus provides a flowing path for zero sequence current, which will decrease the efficiency of the whole control system. To solve zero-sequence current of the semi-controlled open winding PMSG system, a model predictive current control (MPCC) method is proposed based on the analysis of the working principle...
In this paper, a Verilog-AMS based methodology for automated verification is discussed. This solution is geared towards aiding the verification of behavioral models, which designers are tasked with when developing or editing a schematic. Up to now the conventional way to verify the operation of a model and how much it mimics the operation of a schematic is to visually inspect the output signals between...
In this paper, a second-order sliding mode control based on super-twisting algorithm is applied for bidirectional DCDC converter. Two sliding mode controllers are given for buck mode and boost mode of the DCDC converter, and they can be switched to achieve the voltage/current output regulation according to the different working conditions of DCDC converter. Different working conditions of DCDC converter...
In this paper, a step-up dc-dc converter for mobile device applications is proposed. The converter is operated with 1 MHz high switching frequency. The power stage of converter includes an inductor, an output capacitor, MOS transistors and feedback resistors for control loop. The control stage consists of an error amplifier, comparator, a ramp generator for PWM block, bandgap reference and soft start...
This paper investigates the finite-time output feedback control problem for DC-DC buck converter systems. By using the techniques of finite-time controller and finite-time convergent observer, a new fast voltage regulation control algorithm is designed which can guarantee that the output voltage converges to the reference voltage in the finite time. An inductive current convergent observers has been...
This paper presents a novel circuit implementation for overcurrent protection of low-dropout voltage regulators, that is able to limit the maximum current the regulator can source into the load to a value set by the user and to keep the current limit value fairly independent of process variation and output voltage, as well as maintaining its temperature drift over the wide temperature range of −50°C...
This paper presents the issue of the control units used for tuning of Petersen coil. Utilization of specific algorithm is given by certain application assumptions. Generally, it is possible to say that all algorithms can contribute to reducing of the fault current size. The size of the fault current is different depending on the adverse effects and the algorithm used. This also influences the time...
This paper proposes a single-phase UPFC topology using an autotransformer structure. The proposed topology uses a N:1 transformer, which is connected as an autotransformer and a power converter module which consists of a single-phase half-bridge converter and an inverter. Also, the three-phase system can be comprised of three single-phase UPFCs. In three-phase system, while the conventional UPFC topology...
The paper presents the method of digital modelling of process of switching on by vacuum switch in capacitive circuits. Currently, there are few descriptions of vacuum switch models used for capacitive circuits switching on. More often researchers focus on vacuum switch models used for switching of the circuits (also previous works of the Authors) and even more often models used for switching of the...
Single-phase inverters suffer from double-frequency ripple of the input power. For mitigation, an input capacitor is applied but the fluctuation range of power across it is limited according the desired fluctuation in the dc-link voltage. To realize power decoupling without changes in the main circuit and in the control strategy of it, an additional independent power decoupling circuit can be applied,...
This paper presents the design and analysis of a Modular Multilevel Matrix Converter (M3C) working as a frequency changer to facilitate the deployment of offshore Low Frequency AC (LFAC) transmission system. The converter consists of nine branches, each with n cascaded H-bridge submodules connected in series with the arm inductor. The paper proposes a new energy balance control method, which manages...
An external capacitor-less low dropout (LDO) voltage regulator with high PSRR and enhanced transient response is presented. The novel idea is applying a replica circuit which can pull excessive current. Excessive Current Pulling (ECP) technique decreases the equivalent output impedance to enhance transient response. The proposed LDO has been simulated in 0.18 μm CMOS Technology. Its regulated output...
Solid state transformer (SST) has recently attracted much attention due to its great potential of being applied in the future smart grid. Modular structure is commonly employed in SST, which makes it possible to enhance the reliability of the system by introducing redundancy fault-tolerant control (RFC). This paper presents a general design of 10kV/1MW SST with 800V DC bus, and the various RFC strategies...
A multiterminal Energy Interconnection System Based on MMC was developed, which connected active sub-modules, DC grids and AC grids. However, the power imbalance of the active sub-modules exists in this system, for example, inconsistent maximum power points of the PV panels will lead to system power loss. In order to solve the problem, this paper first presents a power control scheme between the three-terminals,...
This work studies voltage regulation strategies that allow accommodating more PV generation in distribution feeders. It is proposed a strategy in which PV inverters nearer the substation use Q(P) curves with capacitive power factor. PV inverters far from the substation should have inductive power factor. Simulation results suggest that by using the proposed strategy, voltages could be kept in acceptable...
A bipolar dc microgrid features three voltage levels and is capable of transmitting power more efficiently than a unipolar system. This paper proposes a droop control to achieve load sharing and voltage balancing in such a microgrid system. Droop control is adopted to ensure that autonomous sharing of load power can be realized without communication. Moreover, the positive and negative pole voltages...
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