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An efficient three phase interleaved DC-DC converter is proposed with inductor current and voltage control. The use of multiple sensors for each phase current is eliminated using current reconstruction. This reduces the number of current sensors and improves the reliability. The inductor current control is achieved using single current sensor which measures DC-link current. The proposed converter...
This paper presents a voltage control for an offshore load fed by a Multi-Terminal VSC-HVDC transmission system (MTHVDC). The studied system is composed by two GSCs (Grid Side Converters) and one OSC (Offshore Side Converter). The objective is to maintain the amplitude and frequency of the AC voltage constant at the offshore terminal with a minimum overshoot. A vector control strategy including a...
Modular Multilevel Converter (MMC) is becoming increasingly popular with the development of HVDC connections and, in the future, with the integration of Multi Terminal DC grids. A lot of publications have been published about this topology these last years since it was first proposed. Few of them are addressing explicitly the two different roles that are held by this converter in an HVDC link: power...
Considering the large starting current of the asynchronous motors, this paper presents a soft starting system of the asynchronous motors based on fuzzy adaptive control whose control rule and control factor can be adjusted by itself. According to the starting characteristic of asynchronous motors, taking current deviation and deviation change rate as input and the change of trigger angle of thyristors...
Two types of gyrators that can be used for controlling the energy transfer between two sub networks are analyzed in this paper. The first one operates time-continuously and is implemented using a LM 13700 operational transconductance amplifier (OTA). Under PSpice simulation and experimentally gathered data the antireciprocity of this gyrator has been verified. The main advantage of this realization...
The ever mounting demand of electrical energy and the keen scarcity of conventional energy sources leads to the burgeon of distributed generation (DG) system. The main abstruse is the harmonization of the DG to the utility grid. Generally current regulated PWM voltage-source inverters (VSI) are used for synchronizing the utility grid with DG source in order to meet the following objectives: 1) To...
A reliable islanding detection method is one of the most important function of a well designed inverter based distributed generation (DG) system. Active islanding detection methods have negligible non-detection zone, but they bring some power quality issues to the network. In this paper an islanding detection method which addresses constant current inverter based DGs is introduced. It has both high...
Considering that the lifespan of electrolytic capacitors in power supply don't match that of LED, we propose a Buck converter which uses active ripple compensation circuit to replace the traditional electrolytic capacitor filter. When the converter works on long duty ratio, the power loss in compensation circuit is small and ripple current and voltage are low. The operation principle of this new topology...
The PWM solenoid is the critical component of the shift control system. To reduce the electronic flow and power consumption, as well as to offset the influence of the fluctuating voltage and temperature, research on the control characteristic of the PWM solenoid was conducted. After the introduction of the structure and usage of PWM solenoid, the flow equation when it is open and close was established...
This paper deals with the power flow analysis and control strategy research of unified power quality conditioner (UPQC). A UPQC is a combination of shunt and series active power filter (APF), sharing a common dc link. It can compensate almost all power quality problems such as voltage harmonics, voltage unbalance, voltage flickers, voltage sags, voltage swells, current harmonics, current unbalance,...
In this paper, a coupling finite element method (FEM) of magnetic field and circuit of traction power transformer is established, including a two-dimensional finite element model and four-quadrant rectifier circuit. The no-load and short-circuit characteristics of traction power transformer are calculated and the value of impedance voltage is given. The space distributions of flux density, magnetic...
This paper presents the design of current mode PI controller for single-phase PWM inverter. The controller is comprised of inductor current as the inner loop and output voltage as the outer feedback loop. The control design is carried out using Sisotool, which is provided in Matlab. By using this tool, users can examine the effects of changing the gain control values to system's transient response...
This paper proposes a parallel energy-sharing configuration of energy management control for fuel cell hybrid vehicles (FCHVs) application. The hybrid energy source consists of fuel cells (FCs) and energy storage units (ESUs) made up of battery pack and ultracapacitor (UC) module. The aim of the control is to regulate the DC link voltage, which is connected to the traction DC motor via the h-bridge...
As the output power of the photovoltaic (PV) cell changes with the insolation , PV cell temperature and cell voltage changing. It is necessary to control the operating point to draw the maximum power of the PV cell in order to increase system efficiency. In this paper, two-level single phase PV grid-connected system is designed, which mainly includes PV cell, BOOST circuit, inverter, filter and the...
This paper thoroughly analyzes various linear control loop designs of DC-AC inverters. First, the PI and P+Resonant controllers for current mode of operation are investigated. Then a detailed analysis of the various inverter control techniques for voltage mode operation is performed and the most promising technique is further analyzed. Finally simulation and experimental results are presented.
Controlled-Capacitor-Charging (CCC) is a technique to synthesize a desired voltage profile at the output from the unregulated DC at the input. Earlier models of the Controlled-Capacitor-Charging type Inverters deals with the Single-Phase Inverter and the dynamic performance are not available. This paper deals with the performance of Capacitor-Charging-type Inverter. A simple technique to design the...
A novel solution for last generation power MOSFETs is proposed for the first time to reduce commutation losses and easy the voltage and current control during hard switching commutations. The proposed structure is easily applicable to any driver topology and it is devoted to the realization of an hard-switched PWM inverter leg based on two power mosfets. The bidirectional conduction capability of...
This paper proposes a current control strategy with zero steady-state tracking error for grid-connected boost-inverters. Two boost converters are controlled separately to achieve both output current tracking and balanced output voltages. Based on cascading control and feedback linearization, the inner and outer-loop controllers are derived combining the inversion of boost converter model and the output...
DC/DC converters have been tremendously utilized nowadays. In some special applications such as military, aerospace, and precision instrumentation, the output voltage ripple of DC/DC converters has to be maintained in an acceptable level to achieve superior performance. For example, DC/DC converters are tied with inverter for adjustable speed motor controls or renewable energy interface with utility...
The configuration of a single-phase three-level neutral point clamped (NPC) converter has been widely applied in high-speed railway electrical traction drive systems. This paper proposes a control and modulation scheme for the single-phase three-level NPC converter. Firstly, an active and reactive current decoupled control scheme in d-q synchronous frame is presented for single-phase three-level NPC...
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