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This paper presents a sliding mode control for a three-phase grid-connected voltage source inverter with vector operation. The design of closed-loop system is based on the sliding-mode theory, and it is carried out with the help of a converter large-signal dynamic model. The closed-loop system improves the transient response and minimizes the steady-state error. Essentially, the contribution of this...
Energy efficiency and size reduction are crucial in modern power electronic converters where more energy saving and less volume of power converters are desired simultaneously. This paper will aim to propose efficient and compact boost-inverter operating at 200 kHz based on the Silicon Carbide (SiC) power switching devices. The boost-inverter using SiC power switches instead of Si devices will result...
This paper develops selective strategies for Neutral Point Clamped Multilevel Inverter (NPC) in a microgrid application with load current decomposition based on Synchronous Reference Frame (DQ) method. The 3-level NPC inverter is investigated as widely used topology for medium and high power applications. In addition to the current injection into the grid, the 3-level NPC DG inverter is also being...
This paper proposed an inner current loop control method for a grid-connected inverter with a LCL filter, which used the inverter side current as feedback parameter. Due to the sensitivity of grid current to grid voltage distortion, the grid voltage feedforward schemes were utilized to solve this problem. Nevertheless, the sampling distortion of grid voltage will bring about the distortion of grid...
This paper proposes a system to connect a small wind turbine to the electric grid, which controls the current injected into the mains and it tracks the maximum power of the generator. The proposed system is based on a three-phase diode bridge rectifier, a DC-DC Forward converter that provides electrical isolation, gain and control, and a Full-Bridge inverter, which it is fed in current and it is switched...
A novel single-phase current fed full-bridge converter with split DC output voltage, multifunctional input source (main grid, photovoltaic modules or battery bank), power factor correction for main grid applications and high-frequency transformer (HFT) isolation topology is presented in this paper. This converter might be a suitable alternative when used as an input stage of uninterruptible power...
This paper proposes Z-source with voltage multiplication inverter for grid connected Photovoltaic (PV) application. The proposed scheme has two-stage. The first stage consists of Z-source with voltage multiplication converter. The proposed converter has high gain compared to other transformer less topologies and reduced voltage stress on the switch. The second stage assembled from five switch inverter...
This paper proposes application of three-phase boost inverter for harmonic and reactive power compensation at the point of common coupling (PCC). A three-phase boost inverter is a combination of three symmetrical parameter boost converters connected in cascade. A DC link voltage control approach with a phase locked loop system is used to generate the synchronized reference voltage for the boost converter...
This paper introduces a direct model predictive control (MPC) strategy to control both sides of a quasi-Z-source inverter (qZSI) based on the inductor and the output currents. To improve the performance of the controlled system, a long prediction horizon is implemented. However, the underlying optimization problem may become computationally intractable because of the increased computational power...
According to different operating modes of microgrid, different control strategies for energy storage system are presented. When microgrid parallels in the grid, the bus voltage of microgrid was supported by grid, and the energy storage system serves as the PQ source, using PQ control strategy; When microgrid is off-grid, the energy storage system serves as the main power supply of microgrid, using...
In electric vehicle (EV) systems, bi-directional DC/DC converters are applied to interface the battery bank with the high voltage DC-link of the inverter. The control of the DC-link voltage is important for the high performance of the system. A DC-link voltage control strategy for the bidirectional DC/DC converter is proposed, which eliminates the need for detecting the operating mode and do not need...
The conversion between DC and AC power will typically introduce a low-frequency pulsation power in the DC side of single phase power converter which may create instability, lowers its efficiency, and reduces the reliability. In this paper, a novel Power Decoupling Modular (PDM) with 2 series differential decoupling capacitors at the ac side is proposed. Compared with the DC PDM, the proposed modular...
The self-consumption of PV-systems can be increased with a battery. The proposed three-phase inverter provides three independent DC inputs that can each be connected to a battery or a PV-string. The innovative topology allows energy flow in each direction at a very high efficiency (> 98 % in each converter stage). The application of SiC transistors leads to a higher switching frequency (48 kHz)...
This paper presents a multi motor drive based on a dual purpose energy conversion system with an energy storage. The proposed structure and control are directly applicable for heating ventilation and air conditioning (HVAC) systems adding an energy storage functionality. Based on the new structure, a dual functional control scheme has been introduced to manage the charging/discharging of the energy...
The boost inverter topology achieves both boosting and inversion in a single stage. Various controllers have been implemented on boost inverters to obtain stable operation. However, the double loop control strategy is the most appropriate because it provides good performance under nonlinear loads, abrupt load variations and transient short-circuit conditions. The double loop control strategy was introduced...
Parabolic current control is an attractive current control method with fast transient response and constant switching frequency. Due to the good dynamics of parabolic current control, it can be employed in voltage source inverters to improve the system performance such as minimizing the distortion of current waveforms or voltage waveforms. To implement parabolic current control, a current sensor is...
A new fixed-frequency controlled 3-phase dc-dc LCL-type series resonant converter with integrated boost function is proposed for medium to large power applications with wide input voltage variation that is typical of alternate energy sources. The converter includes dual three-phase LCL-type resonant bridge inverter modules connected in parallel, thus significantly reducing the component stresses when...
Input-series-output-parallel (ISOP) inverter system is very suitable for high input voltage and high output current power conversion applications. Distributed control and redundancy are badly needed to improve system reliability, which is the crucial point of this topology. This paper firstly proposes a new solution dedicated to distributed configuration and the corresponding control strategy, i.e...
An adaptive current-sharing control strategy with virtual circulating impedance for single-phase parallel connected UPS is proposed in this paper. The current-sharing scheme of the paralleled system is developed and the theoretical analysis of the virtual circulating impedance is studied. The impact of the virtual circulating impedance on the stability of the paralleled system is also discussed. Moreover,...
Variable carrier frequency control of PWM inverter based on deadbeat control using SoC-FPGA based hardware controller was proposed. The inductor current was controlled using digital hysteresis method and the output current was controlled using deadbeat control with disturbance compensator. As the result, the control accuracy and the efficiency of the inverter can be adjustable with superior tracking...
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