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.
This paper proposes a fault tolerant control method of an open-switch fault for a single IGBT in two parallel-connected three-phase AC/DC PWM converter systems. Recently, parallel converter has been widely used in the high power application. However, if the open-switch fault of the IGBT occur in the parallel converter, faulty condition causes the dc-link voltage fluctuation, the distorted grid current...
Increasing penetration level of photovoltaic (PV) distributed generation (DG) into distribution networks will have many impacts on nominal circuit operating conditions including voltage quality and reverse power flow issues. In U.S. most studies on PVDG impacts on distribution networks are performed for west coast and central states. The objective of this paper is to study the impacts of PVDG integration...
Power quality is an important issue for wave energy developers, as the wave energy converters output power profile can present fluctuations in the range of seconds, due to the oscillatory nature of the ocean waves. The impact of these devices on the electric grid hence needs to be investigated for wave farms to be connected to the grid. In order to emulate an operating direct drive wave energy converter,...
This paper proposes a two-stage three-level DC/AC converter, which consists a three-level inter-leaved dc/dc boost converter in the first stage, and a three-level neutral-point-clamped (NPC) inverter in the second stage. The boost converter regulates variable and/or wide-range dc source, then provides suitable and stable dc voltage to the NPC inverter. The NPC inverter generates variable frequency...
Large penetration of intermittent renewable energy and complex loads in Active Distribution Network (ADN) has aggravated the fluctuation of voltage and increased power loss. Battery energy storage system (BESS) is a critical device in ADN, which are used to provide active power for the system. However, by connected with the grid using converter, battery has the ability to provide reactive power for...
In this paper, a DC-DC converter designed specifically for the case of an input voltage with flicker to generate a DC output without oscillations. The PI controller of the DC-DC converter is designed to be variable gain and adaptive to the input voltage signal. The designed system has been first tested in the Matlab/Simulink environment with the rectified form of the synthetic input voltage signals...
A conventional Unified Power Quality Conditioner (UPQC) is a back-to-back shunt and series converters with a dc-link capacitor, requires 12 switches to resolve voltage and current related power quality issues. Recently a nine-switch UPQC (NS-UPQC) is proposed, but suffers with certain limitations like limited reference amplitude and phase shift, twice the rated dc-link voltage and increased stress...
At present power quality is the primary term in the power system. PQ problems like voltage sag and swells in the load. Fore long occurrence of these hurdles can result in failure of appliances at short duration of time. In this paper in-phase voltage injection scheme for DVR are employed with a Photovoltaic system. Dynamic Voltage Restorer (DVR) is a better performer and is of lesser cost. The control...
Power quality is an importance term used for measuring quality of Electrical supply to an industrial, domestic and commercial loads. In an Electrical industry, Power quality is primarily a main concern. The power quality issue occurs when the system load in the power system is affected with problems such as transients, harmonics and voltage sag and swell. Hence the power quality issues needed to be...
The stator transient DC flux component emerges in the Double Fed Induction Generator (DFIG) following grid voltage dip, which results in an important influence on the controllability of rotor converter. In this paper, the research focuses on the responding time of the dynamic reactive current injection referring to DFIG with the crowbar protection under Zero Voltage Ride-Through (ZVRT). Firstly, theoretical...
This paper proposes a novel control strategy for electrolytic capacitor-less quasi-Z-source inverter, which fed adjustable-speed drive (ASD) system with almost unit input power factor. The system has no shoot through issues and gains high reliability. By using E-caps-less topology, the life time can be greatly increased. In order to guarantee the high power factor and the ability of resisting grid...
\n this paper, a synchronous frame control for a voltage sag/swell compensator utilizing single-phase matrix converter is proposed. First, the configuration of proposed system and its operation are described. Next, effects of the degree of voltage sag and load variation on the system stability is analyzed by transfer function. Finally, experimental waveforms for the system with proposed synchronous...
The paper considers a sensorless V/f control system of IM drive under normal conditions and under voltage dip conditions. The control system is designed on the principle of subordinate regulation and consists of two loops. Rotor speed estimation is based upon linearized relation between the rotor current frequency and the active component of the stator current obtained for IR-compensation scheme....
In this paper is analysed the power quality phenomena that can occur in a plant producing wood-based panels. In the measurements was used PowerLogic ION7650, connected in power substation (110/20 kV). Reports provided by analyser showed the electromagnetic disturbances that could adversely affect the operation of electrical equipment from analysed plant. Experimental results allowed the identification...
Electric Arc furnaces (EAF) are intensive distressing, unbalanced, stochastic, time varying, non-linear loads which are used in steel industry. Their non linearity and dynamic characteristics produce harmonic problems and fluctuation of voltage. Advanced control strategy based Custom Power Device such as Unified Power Quality Conditioner (UPQC) is designed to provide significant reduction in voltage...
Presently, the quality of power supplied is essential to many customers. Power quality (PQ) is a valued utility service where many customers are prepared to pay and get it. In the future, distribution system operators ought to decide, to provide their customers with distinct PQ ranges at different prices. Here, in this paper, a new control action to improve and maintain and enhance the power quality...
A Dynamic Voltage Restorer (DVR) model is designed for the mitigation of voltage sag and is tested for distribution system to improve Power Quality (PQ). The design is carried out with the aid of Voltage Source Inverter (VSI) in the application of DVR. The experimental results obtained are presented in this paper to analyze the performance of VSI with Sinusoidal Pulse Width Modulation (SPWM) control...
A novel and computationally efficient method for d-q control of solar photovoltaic (SPV) integrated UPQC (PV-UPQC) is presented in this paper. A digital filter is used to extract fundamental positive sequence (FPS) component of distorted grid voltage which is used to generate the sine and cosine values necessary in d-q based control. The shunt compensator of PV-UPQC compensates for the load side power...
In the upcoming field of e-mobility, roof-mounted solar cell systems are used to operate the thermoelectric system, compressors for maintaining the cabin temperature and also to extend the cruising range of electric vehicles. Managing and maintaining the voltage output is crucial. Intelligent DC-DC converters can improve the overall efficiency of the solar cells. The inbuilt intelligence in the converter...
The modular multilevel converter(MMC) is one of the most attractive converter topologies for high or medium voltage power system. In this paper, a combination of modular multilevel converter and dual active bridge(DAB) is discussed. The DAB assisted MMC(MMC-DAB) is capable of low frequency output with elimination of capacitor voltage fluctuations in submodules. This paper analyzes the MMC-DAB structure...
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.