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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...
This paper describes a system which is capable of frequency and voltage regulation during load changes on an islanded microgrid. The scaled microgrid model used in this paper consists of a synchronous generator, a solar panel with a single phase inverter, and a varying resistive load. The PV panel is connected to a boost converter which tracks a fraction of the solar panel's maximum power point. This...
As the aircraft technology is moving towards more electric architecture, use of electric motors in aircraft is increasing. Axial-flux BLDC motors are becoming popular in aero application because of their ability to meet the demand of light weight, high power density, high efficiency and high reliability. Axial-flux BLDC motors in general and ironless axial flux BLDC motors in particular, come with...
The use of small inverter-interfaced distributed energy resources for reactive power support is discussed. While the primary function of these resources is to deliver active power, they can also be used to provide reactive power, often identified as an ancillary service by a utility. Given the large and increasing number of small grid-connected inverters, the total reactive power that can be collectively...
In order to improve power reliability of critical load, distributed generation (DG) should be with intentional islanding operation when utility is outage. This paper proposes a novel control strategy for three phase inverter in DG to realize transferring between grid-tied and islanding modes, which is with an inner inductor current loop and outer capacitor voltage loop in the synchronous rotating...
For dc-microgrid applications, a power supply system requires a bi-directional inverter to control the power flow between dc bus and ac grid, and to regulate the dc bus to a certain range of voltages. Its microcontroller has to determine operational modes and current commands for the inverter cycle by cycle. For using the memory space of the microcontroller efficiently and increasing current-command...
A Positive Feed-Forward (PFF) controller is proposed as a new active approach to improve stability of a three-phase DC/AC switching inverter. In particular, the proposed approach solves the source subsystem interaction problem, i.e., a system stability degradation which is commonly observed when the inverter is connected to a DC voltage source subsystem that presents finite Thévenin impedance. The...
Droop control method is the fundamental theory in wireless parallel operation. In droop method, the output active power and reactive power need to be calculated accurately for adjusting angular frequency and amplitude of inverter output voltage. So the accuracy and speed of power calculation is very important for the performance of parallel operation. Traditional calculation methods in single-phase...
In the configuration of the multilevel inverter which is used in this study, two cascaded H-bridge cells are connected in series with each phase of a three-phase three-level neutral-point clamped (NPC) inverter. The NPC inverter is fed by a single DC source; whereas, all of the cascaded H-bridge cells are supplied by capacitors. In this paper, in order to regulate the voltage across the H-bridge capacitors,...
A part of an electric power system can operate as a standalone system without any connection to the main grid. Such autonomous systems include dedicated power systems for rural areas, moveable military bases and facilities requiring premium power quality. For the proper calculation and control operation of autonomous generation systems, the dynamics of the power sources and the loads must be properly...
In this paper the Quasi-Z-Source Inverter (QZSI) with Energy Storage for Photovoltaic Power Generation Systems is presented. The energy storage device was integrated to QZSI topology with no need for an extra charging circuit. This upgraded topology acquires the operating characteristics from the traditional QZSI, plus the capability of operating under very low PV power conditions. Its main operating...
This paper presents a software-based adaptive dead-time compensation technique for single-phase grid-connected photovoltaic (PV) inverter system. To prevent a short circuit in the dc-link, a switching delay time is needed to be inserted in Pulse Width Modulation (PWM) signals. This causes the dead-time effect which is harmful to the system performance. To improve the mitigation of dead-time effect...
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...
Modular multilevel converter (MMC) is one of the excellent selections for high voltage and high power conversion applications without transformers. It provides the advantages such as high modularity, availability, low generation of harmonics, etc. However, the circulating current distorts the leg currents and increases the rated current of power devices, which further increases system cost. By controlling...
The research of control and protection in Micro grid technology is key to distributed generation(DG), such as wind power, Photovoltaic (PV) power generation, tidal power and so on. Through DC-AC converter or AC-DC-AC converter the renewable energy supply power to the loads, so the power electronics technology has a decisive role in DG and Micro grid technology based on renewable energy. In this paper,...
This paper describes the CC2430 ZigBee chip used In the design of photovoltaic power generation system, specifically is to TI's CC2430 ZigBee chip implanted into the photovoltaic power generation system, take advantage of CC2430 features in the single-chip computer to achieve the photovoltaic solar panel system, voltage, current, temperature, light intensity and the voltage inverter, current, and...
In this work, we are interested in the experimentation of an autonomous wind energy conversion system (WECS) using a test bench emulating a variable speed wind turbine (VSWT). This wind generator is connected to isolated loads through a DC bus and an inverter. The regulation of the DC bus voltage is carried out by a DC load controlled by a chopper. The goal of our work is to show the load voltage...
PV solar farms produce power during the day and are completely idle in the nights. This paper presents a novel utilization of a PV solar plant as STATCOM in the night for load reactive power compensation and voltage control. This STATCOM functionality will also be available to a substantial degree during the daytime with the inverter capacity remaining after real power production. The local distribution...
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...
This work deals with a control strategy and power management of a hybrid power source used as Distributed Generator (DG) system. The system includes a proton exchange membrane fuel cell `PEMFC' which is used as a main source and equipped by a storage system "Supercapacitor" which ensures the continuity of the energy production. The source is connected to the power electrical system (PES)...
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