The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Different electrical power formulations have been developed to improve the quality of electrical power. These developments have served to establish different strategies for the control of active power filters (APF). However, most strategies have been applied to APF of parallel connection. These type of compensators are only effective in compensating loads of the harmonic current source type (HCS)...
Electronic devices such as SMPS, UPS, rectifier and electronic ballast primarily require DC power supply. Electronic switching devices draw highly distorted input current (spikes with respect to the line voltage) for a short duration, due to their non-linear nature. This results in interference with other electrical equipment, increase in Total Harmonic Distortion (THD) and poor Power Factor (PF),...
Increased size and capacity of individual wind turbine has posed a major challenge for high power conversions. For this scenario advanced multilevel converter topologies and parallel operation of Active Front End (AFE) rectifiers are gaining popularity. But there are issues on reliability and complicacy of control and operation of active power electronic devices at such high power. The Passive Front...
A novel three-phase multilevel inverter using a single dc source is proposed in this paper, which uses flying capacitors for generating different voltage levels. Pole voltage levels can be of five levels or higher than that. The structural similarity of the front end of the proposed inverter with that of the three-level neutral-point clamped inverter and the presence of redundant switching states...
In this paper, a variable step size filtered X-least mean fourth (FX-LMF) algorithm is proposed for a single-stage three-phase grid tied solar energy conversion system with active shunt filter capabilities. It consists of a SPV (Solar Photovoltaic) array, a voltage source converter, a three-phase grid and connected linear and nonlinear loads. The proposed algorithm helps in faster convergence and...
This paper discusses the integration of a three-phase Distributed generation (DG) into a grid-tied Photovoltaic (PV) system. A single-stage power conversion system comprising a Current Source Inverter (CSI) capable of dc voltage boost is proposed for this PV MIC system, to control which, a multivariable-proportional-integral (PI) regulator-based power control strategy is designed. It will control...
In the present scenario, high power industrial drive applications mostly employ Voltage Source Inverter (VSI) fed induction motors. In the very high power ranges (>10 MW), Load Commutated Inverter (LCI) fed synchronous motors are also used. Economy and efficiency are crucial factors for drives in such high power applications. Recently, a new hybrid drive topology using a specially designed dual...
A single phase two switch SEPIC output regulated rectifier is proposed in this paper. The proposed AC-DC converter has power factor correction and input current shaping facility. The rectifier produces buck-boost voltage/current gain. Taking advantage of this characteristic the design of the proposed two switch rectifier has been made separately to operate as buck converter and boost converter. A...
DC power conditioning and processing is an essential challenge now a days. Rectifiers having bridge structures are considered to be nonlinear as they draw non sinusoidal current from line. This distorted current causes several problems related to power quality. In this paper, a new configuration of single phase single switch controlled rectifier using SEPIC topology is proposed. The input current...
In this paper, the topology of distribution static compensator (DSTATCOM) with a three-phase four-wire system is modified. The modification concerns with the interfacing filter and DC-link capacitor with a goal of improving the system power factor, stabilizing the system voltages and eliminating the harmonic distortion resulting from nonlinear loads. The modified DSTATCOM has a three-leg inverter...
A new topology of single-phase SEPIC (Single Ended Primary Inductor Converter) AC-DC converter with low input current THD and high input power factor is proposed. Instead of using a single phase rectifier followed by a boost DC-DC converter, or using a bridge rectifier with two diodes and two switches, the rectifier's input is chopped at high frequency during positive and negative cycles by a single...
Power Electronic Transformer(PET) is a promising component in the future power system. The modular PET is the most attractive due to its high voltage level and flexible function. Unfortunately, when the modular PET is driving multiple loads, there would be overmodulation issue in the AC-DC stage caused by the unbalanced load power. This paper proposed a reactive component injection control strategy...
This paper presents a Matlab/Simulink model of a 300 KW grid connected photovoltaic (PV) system. The system includes a 300 KW PV array, a maximum power point tracking boost converter using perturbation and observation (P&O) method and a grid connected inverter with its control system. An L-filter is designed to smoothly connect the inverter to the utility grid. The boost converter controlled by...
HVDC power tapping has proven to be the appropriate solution for rural AC networks. This tapping can be achieved by using series or parallel HVDC tap stations. But, many researchers have faced some technical and economic issues when designing tapping stations with small power ratings. In this paper, many topologies of tapping converters are reviewed focusing on their designs and providing pros and...
This paper presents a hyperbolic tangent function (HTF) based higher order adaptive control algorithm with a perturb & observe (P&O) MPPT (Maximum Power Point Tracking) for a three phase grid connected single stage SPV (Solar Photovoltaic) system with DSTATCOM (Distribution Static Synchronous Compensator) capabilities. The variable learning based HTF reduces the mean square error in the system,...
The nine-switch converter topology with 2 three-phase ac terminals has recently been utilized in the literature for ac to ac power conversion. Nonetheless, the existing control techniques essentially involve complicated linear controller design with special modulation schemes. This paper presents a simple yet high performance controller based on finite control set model predictive control (FCS-MPC)...
Solar storms can induce quasi-dc geomagnetically induced current (GIC) flows in power grids, which could potentially lead to transformer damage and system stability and reliability issues. We consider the problem of designing operational GIC mitigation strategies by switching transmission lines. This topology control approach could relieve the power network from temporarily high level of GIC flows,...
The paper focuses on the dynamic response of a secondary voltage control scheme for distribution networks. The proposed control is based on a hierarchical architecture and is similar to the hierarchical voltage control implemented in some countries in high voltage transmission systems. The objective of the paper is to show a possible undesired dynamic coupling of different reactive power control loops...
This paper proposes a new power management strategy based on pq-Theory for fuel cell and electric vehicle applications. Using a modular cascaded converter topology, more than one power source could be combined with capacitors to supply active and reactive power in an efficient manner to the electric motor. The control strategy to separate mean and oscillating active power and reactive power, as well...
In this paper, the mathematical model of type-4 wind turbine topology is developed to represent its dynamic behavior. The main objective of a type-4 wind turbine is to deliver active power to the system, but to perform this action; it must absorb reactive power from the power network, causing disturbances and stress in the rest of the power system. Through the dynamic control system used in the back...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.