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This paper proposes an indirect current control algorithm for seamless transfer of three-phase utility-interactive inverters. With the proposed method the inverter is able to provide critical loads with a stable and seamless voltage during the whole transition period including both clearing time and control mode change. The LCL filter design which is suitable for the indirect current control is also...
Solid state transformer (SST) is considered the key unit for power processing and conversion in the future distributed renewable energy network. The role of SST is to enable the active management of distributed energy resources, energy storage devices and different type of loads in a distribution grid. Inverter stage of SST supplies sinusoidal voltage to the users. In this paper an improved inductor...
The increasing penetration of generation power plants based on renewable energies in the electrical networks has boosted the number of systems connected to the grid. In this scenario the microgrid, providing advanced functionalities to improve the stability and operation of the network, have become very popular. In this paper a control strategy for the microgrid management is presented. The proposed...
Dc-dc Buck converter has a major application for powering integrated circuit under stringent regulation, nowadays. In this paper, a practical digital control algorithm is presented to achieve the optimal response for dc-dc Buck converters without relying on the knowledge of the passive component value (inductance and capacitance). This algorithm introduces the curve fitting analysis for deriving the...
This paper presents a novel PID self regulating tri loop controller for a hybrid PV-FC-Diesel-Battery powered all-wheel drive electric vehicle using four Permanent Magnet DC (PMDC) motors, which are modeled to include existing nonlinearities in motor plus load inertia (J) and viscous friction (B). A Tri Loop dynamic error driven scheme is based on Multi Objective Particle Swarm Optimization MOPSO...
The increasing penetration of generation power plants based on renewable energies in the electrical networks has boosted the number of systems connected to the grid. In this scenario the microgrid, providing advanced functionalities to improve the stability and operation of the network, have become very popular. In this paper a control strategy for the microgrid management is presented. The proposed...
This paper presents an approach to radio frequency (RF) power control along a power curve specified as a function of load impedance, which varies with time. The control algorithm was developed to control the output of electrosurgical generator s but can be used in any other application, where for time-varying loads, some specific power, voltage and current limits have to be met. Such generators may...
The output-voltage-derivative term of a proportional-integral-derivative (PID) controller injects significant noise in a dc-dc converter. This is mainly due to the presence of parasitic resistance and inductance of the output capacitor. Particularly during a large-signal transient, noise injection significantly degrades phase margin. Although noise characteristics can be improved by reducing the cut-off...
This paper presents a novel selective control algorithm for a shunt active filter. Based on the proposed control algorithm, the active filter drains controlled currents in order to improve the performance of the passive filters and also to minimize a specific harmonic component of the system voltages. The controlled currents produced by the active filter are determined through the system voltages,...
In this paper, the effect of voltage dips on variable speed wind turbines using VSCs is treated. Three different current controllers for the VSC are described and implemented. Their performance is evaluated when the converter is subjected to different types of voltage dips, Both simulated and measured dips are used. The effect of the phase-angle jump of the dips is also taken into account.
A digital adaptive voltage positioning (Digital AVP) technique with fast transient response for voltage regulators (VRs) is proposed in this paper. In this proposed digital control architecture, two digital-to-analog converters (DACs) are used instead of analog-to-digital converters (ADCs), thus significantly reducing system complexity. Both the voltage and current references are changed dynamically...
This paper proposes a mathematical model and a voltage/frequency regulation strategy for an islanded, electronically-coupled, distributed resource (DR) unit. The DR unit can either represent a distributed storage (DS) unit or a dispatchable distributed generation (DG) unit. The proposed control strategy benefits from the power circuit configuration, dq-frame current-control scheme, and the phase-locked...
Multi-phase machines and sensorless controllers have the common goal to increase the reliability and robustness of the drive. Nevertheless, few sensorless drives have been developed for the purpose of multi-phase machines. This paper discusses the application of a recently developed sensorless current controller to a multi-phase permanent-magnet synchronous machine rotating at low speed. In this method,...
A new control technique, peak inductor current and differential-mode voltage control technique, for non-isolated single-inductor multiple-output (SIMO) buck converters is investigated in this paper. The proposed control method can realize independent control of different output of the SIMO converters operating in continuous conduction mode (CCM) to reduce cross-regulation effect. By taking a three...
Wind energy penetration to the power market has been continuously increasing over the past decades. High penetration level requires the wind energy generation to be more reliable. For wind farms equipped with doubly fed induction generators (DFIGs), a successful low voltage ride-through scheme has been a key issue to achieve reliable and uninterrupted wind energy generation. This paper proposes a...
Digital peak current (DPC) controlled switching dc-dc converters operating in discontinuous conduction mode (DCM) with four different digital pulse-width modulations are studied in this paper. The control laws by using four modulation methods are derived and compared with buck converter as an example. Their stabilities are also analyzed. Experiment studies are performed to compare the transient performance...
Reduced switching frequency peak current mode is a popular method to boost up light load efficiency of isolated power converters. However, transient response decreases dramatically when low switching frequency is adopted. This paper covers small signal analysis of control scheme that peak current and switching frequency both modulated by the control signal. An interesting result is found that the...
Pulse train control technique for the control of buck converter operating in discontinuous conduction mode (DCM) is studied in this paper. The operating principles of voltage-mode and current-mode pulse train control techniques are discussed and compared. The operation states of the pulse train control buck converter under different input voltage and load conditions are analyzed. The simulation and...
Digital peak current (DPC) control, digital peak voltage (DPV) control, and digital peak voltage/peak current (DPV/DPC) control of buck converter with leading-edge modulation are studied and compared in this paper. The AC small signal transfer functions of control-to-output, input-to-output and output impedance are derived and the corresponding comparison studies are performed. Transient simulation...
Large transient grid voltage unbalance will result in deterioration of the doubly-fed induction generators(DFIGs) by introducing over current of rotor side converter(RSC) and double frequency oscillation in dc link voltage and electromagnetic torque. The rotor current controller with the conventional reduced DFIG model, which does not take into account the stator flux transients, could not obtain...
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