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In this paper, a predictive direct power control (P-DPC) strategy for a three level NPC rectifier under ideal grid voltage is proposed, discussed and applied. With the proposed P-DPC strategy, the control targets are the active power, the reactive power and the neutral potential voltage; neither hysteresis comparators nor switching table are needed; sinusoidal input current with low total harmonic...
Experience Mapping based prediction controller (EMPC)is a newly developed control strategy which has transformed the learning-prediction-adaptation capability of Human motor control (HMC)into engineering world. The control is achieved by forming input-output mapping of the system to be controlled through direct interaction with it in the intended environment. This paper presents the use of EMPC for...
In two-level PWM rectifiers, two common control strategies are respectively VOC (Voltage Oriented Control) and DPC (Direct Power Control). In high power applications, the converter performance may suffer seriously from the non-ideal characteristics of the sampling and control system. The effects of the non-ideal characteristics will be analyzed in this paper for classic VOC, DPC and PDPC (Predictive...
In this paper, the current sensorless control for dual-boost half-bridge (DBHB) converter with power factor correction (PFC) function is presented. The short-through problem can be avoided by the dual-boost structure for enhancing the reliability. It also reduces the power dissipation due to the body diodes' reverse recovery current of switches. Furthermore, the intrinsic voltage-doubler characteristic...
The grid-tied low voltage photovoltaics are expanded day by day. Aiming for a high penetration level, the Fault Ride Through Capability (FRTC) standard should be extended to these units as well. In this paper, the behavior of Single Phase Grid Connected PV Systems under faulty conditions is investigated. For this purpose, a SPWM controlled full bridge voltage source inverter is used. The proposed...
In this paper a multisource renewable energy system for high-current applications is proposed. The power architecture is based on a multi-input power converter including control and reconfiguration subsystems. Independently of the type of connected renewable sources, a proper control of the output DC voltage bus is provided as well as a proper control on the operating point of each renewable source...
This paper introduces a fast closed-loop control strategy for a pulse width and amplitude modulation (PWAM) boost-converter-inverter system for HEV/EV motor drives. The PWAM boost-converter-inverter system, in which the dc-link voltage is controlled to have a 6ω fluctuation following the output peak voltage envelop, provides several advantages over the traditional PWM boost-converter-inverter system,...
Generally, a photovoltaic (PV) system generates a wide range of voltages and currents at the terminal output. Normally, the PV cell cannot functionally maintain a constant direct current (DC) voltage while incident illumination and ambient temperature. To overcome that problem, a power electronics convertor such as DC/DC converter with the control scheme topology may be used. However, a linear conventional...
This article presents a modular approach to generate the interleaved carriers of a parallel converters. Compared with previous solutions requiring accurate analog computations, a straightforward implementation of the generator is proposed here. By using only comparators and logical gates dedicated to the tuning of the carrier phase, a correct interleaving of the carriers is obtained in steady-state...
With an increasing penetration of solar photovoltaic (PV) systems, power distribution grids are becoming more susceptible to network voltage rise. As per applicable standards for grid-integrated PV systems, a PV system must be automatically disconnected from the grid when the terminal voltage of the PV system exceeds a defined maximum voltage. With this directive, in certain situations, PV systems...
In this paper, a new control strategy for three-phase pulse width modulated (PWM) boost rectifiers in two-phase stationary frame using proportional-resonant (PR) controllers as the internal current loop regulators is presented. Compared with the voltage oriented vector control (VOC) method, which is the most common method for its high dynamic and static performance, the proposed method is much simpler;...
This paper proposed a novel multi-objective predictive direct power control (P-DPC) approach to achieve three different control targets dependent on the operation of the network: eliminating negative sequence currents, eliminating active power oscillation and eliminating reactive power oscillation. The proposed P-DPC strategy decouples positive and negative sequence components in the stationary reference...
This paper describes the fuzzy logic based robust pole-placement controller for the buck converter working in Continuous Conduction Mode (CCM). The converter operates at a switching frequency of 500 KHz. Pole-placement controller does not show good robustness to the load variations and the change in supply and reference voltages. In order to improve the static and dynamic properties, pole-placement...
A power electronics benchmark problem involving several practical scenarios for a fixed-frequency synchronous step-down DC-DC converter is investigated. A new weighted control technique that uses the replicator dynamics concepts to weight the operation of different controllers tuned to operate in different modes, and with different control objectives is presented. Simulations for four critical process...
This paper presents a self-tuning adaptive control structure designed through the minimization of a criteria function. It is described the computation methodology of the control law, being particularized for the case of a dual winding induction generator's excitation control. The parameter's estimator, integrated into the control system, is based on the online least mean square error algorithm. In...
This paper presents the design and analysis of both the active and reactive power control of a single-phase voltage source inverter (VSI) for grid-connected photovoltaic (PV) system. The proposed method is based on vector control of power by decoupling control of the active and reactive current components to feed the active and reactive power to the grid. The aim of this research is to control power...
A small-signal model is used to design the controller parameters of the conventional Power Factor Correction (PFC) converter. The dynamics of the converter is nonlinear, therefore, it is hard to derive desirable performance. Genetic algorithm is used to optimize the control parameters of PFC converter in this paper, by this way, the quasi-optimal control parameters can be obtained with the predefined...
This paper presents the H∞ robust control law elaborated on the basis of a state-space averaged model of the Vienna rectifier, expressed in the synchronous rotating frame. A control scheme is designed by using the steady-state and dynamic models of the Vienna rectifier that are derived by means of a local linearization around the nominal operating point. The proposed robust control law is then verified...
Analyzes the working principle of the relief valve with F-π bridge pilot hydraulic resistances network, and uses the HCD database of AMESim to make modeling, and analyses influence of steady-state characteristics under hydraulic resistances parameter, obtained 3 different pressure flow curve, shows that the deviation in the steady-state voltage regulator for positive or zero, F-π bridge relief valve...
One of the main problems when H-bridge multilevel converter is used for compensating reactive power is the DC link regulation; this is because of different losses into each cell. In this paper a DC link regulation strategy is obtained through a power analysis. It is shown how the strategy can be applied as much an asymmetric as a symmetric multilevel converters-based STATCOM. Some of simulation and...
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