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Power converters are an important component of microgrids. They help interconnect renewable sources and energy storage systems in a microgrid. In addition, power converters can provide ancillary services to improve power quality within the microgrid and facilitate interconnection with the electrical power system. The size and the number of the power converters required will depend on the fluctuating...
The advent of grid-connected power electronics applications calls for a good understanding of the possible control methods. A common issue relates herein to the inherent nonzero steady-state error associated to stationary reference frame direct control of sinusoidal waveforms. This paper offers an alternative to the most-used proportional-integral-sinusoidal control solution (also called resonant...
In this manuscript, we propose an adaptive fuzzy logic controller for a DC-DC boost converter with parametric and load uncertainties. The control strategy aims to achieve accurate voltage tracking with unknown dynamics, highly parameter and load variations, and no current sensing. Therefore, robustness to uncertainties of large magnitudes is achieved without the inner current control loop, which reduces...
The growing popularity of LLC resonant converter in half-bridge implementation is due to its high efficiency and ability to achieve high power density. Zero Voltage Switching (ZVS) technique minimizes the turn-on loss of the MOSFETs. However, as switching frequency increases, the converter efficiency will suffer due to the increased turn-off loss and gate charge loss. These effects are especially...
The design of a Single Inductor Dual Output (SIDO) buck converter using two individual voltage mode control loops has been presented in this paper, and the limitation of using such control method has been indicated, then the control schemes for minimizing the cross regulation issue has been discussed. By using two separate control loops, the inductor energy is shared and regulated for both output...
This paper presents a digital controlled distributed converter system with a switched-mode boost type PWM rectifier and several bidirectional buck/boost dc/dc converters for battery charge and discharge system using digital signal controller (DSC). The rectifier can implement bidirectional power flow, sinusoidal current control and unit power factor in grid side. The system is able to control power...
The energy storage devices are necessary to the stand alone PV generation system. Lead acid battery which performance is specially designed is suitable for PV generation application. The battery charging and discharging control with the max power of PV array is the key point to increase efficiency of the generation system. In this paper, the new system configuration with parallel battery charger is...
Analyze the inconsistency phenomena of the charge & discharge of serial batteries and their causes. This paper discusses two ordinary equalization charge methods. Based on comparison and analysis, a new method dispersion-concentration du-grade equalization charge is constructed, which is suit for the equalizing charge of numerous serial batteries on HEV. Simulation calculation is processed on...
In this paper, the characteristics of power lithium-ion batteries is studied. And a non-energy-consuming charging balance system which is controlled by the MCU is designed. In this system the differential amplifier is used to detect each cell voltage of the batteries continuously. The inductors, replace the resistors, is used to bypass the full-charged cell, so the waste of energy can be avoided....
In this paper we describe the complete design and implementation of a digital controller for a dc-dc buck converter working in Continuous Conduction Mode (CCM) using classical control techniques. The converter operates at a switching frequency of 500 KHz. The controller is designed on the basis of digital redesign approach and standard bode plot techniques. The design is then evaluated by taking into...
This paper proposes a T-S fuzzy model based maximum power control to enhance the efficiency of the solar photovoltaic (PV) system. To draw the maximum power from a solar PV array, a buck converter is applied to adjust the output of PV power. Based on the T-S fuzzy representation, the fuzzy maximum power point tracking (MPPT) controller are developed to maintain the maximum power voltage. The MPPT...
This paper presents an application of a control system, part of a Building Management System (BMS), implemented in a large supermarket from Bucharest. One can find a short introduction to BMS, to the cooling system and to the concepts of the used control system. Experimental data were extracted over several hot summer days of working. Finally, some conclusions are introduced.
A new method of charge-to-digital conversion based on the binary-weighted charge redistribution is presented in the paper. The proposed method takes advantage of a binary search algorithm similar to the other successive approximation schemes. The novelty of presented approach consists in a lack of a digital-to-analog converter, and more importantly, also in eliminating a clock that controls converter...
A sensorless control strategy for a permanent magnet synchronous generator (PMSG) in variable speed wind energy conversion system (WECS) is proposed. The proposed method is based on recursive least square estimation (RLSE) algorithm for rotor speed estimation using an equation containing only stator flux and current. Further, rotor position information used for coordinate transformation is computed...
Compared to L-type filter, LCL-type filter have resonance frequency point, consequently reduce the reliability of the VSC converter. The general control strategy with passive damping or active damping can improve the stability of the converter, but it will bring extra loss, and need more sensors. This paper compare and analysis the performance of LCL converter controller with different feedback variables...
This paper derives the inherent relationship between repetitive control (RC) and resonant control. RC is a “broad spectrum” but a slow harmonic suppressor, while resonant control is fast but can be only used to eliminate one specific frequency signal. Most important, based on this, a general internal model principle (IMP) based controller is proposed to offer “tailor-made” high performance control...
In the last years the photovoltaic and wind power generation has been increased significantly. This paper proposes the use of a D-Statcom as inverter interface of each single micro-sources (PV and wind) present in the supply system for a water lift station situated in Marina of Strongoli (KR- Italy) for the reactive compensation to regulate PCC voltage. The power circuit topology and the network are...
The conventional diesel electric propulsion system uses a separately-excited synchronous generator to transform the mechanical power of the diesel engine into electrical power. This paper presents an innovative diesel electric propulsion system employing a 2500kW permanent magnet (PM) generator, which has several benefits such as lower weight, higher efficiency and mechanical robustness. Further,...
This paper reports on the control necessary in a Bristol cylinder sea-wave energy capture device and the issues concerned with harvesting a slow, propagating sea-wave, where the power will pulsate. In the paper a detailed description is put forward for the mechanical system. The control strategies necessary to control a system that is has continuously changing conditions are outlined and simulations...
Different power electronic converters can be applied in a wind energy conversion system (WECS). In this paper, a half-controlled rectifier is evaluated for the purpose. A simple chopper type control is presented as the control algorithm where all the three controllable switches are controlled by the same signal. The half-controlled rectifier can only operate in two quadrants. The main advantages of...
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