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Class-E inverters and Class-E rectifiers are combined to compose isolated Class-E2 DC/DC converters to transfer power through loosely coupled inductive coils. A design method for this converter is discussed to achieve ZVS (zero-voltage switching) and ZDS (zero-derivative switching). The converter is operated in a fix-frequency and open-loop mode. Load characteristics for this converter are analyzed...
This paper presents the design and simulation of an auto-tuning capacitive power transfer (CPT) system based on Class-E converter approach. The reason of selecting Class-E converter is due to the remarkably high efficiency that it can achieve. However, the load's variation affects the output voltage of Class-E converter significantly and increases the switching loss of the system. To regulate the...
This work proposes and simulates a finite set model predictive control technique for the photovoltaic inverter. The power topology is a 30 KW PV array with two power conversion stages: DC/DC boost converter controlled with maximum power point tracking to extract the maximum available photovoltaic power and two-level voltage source inverter with passive filter to convert direct current to alternative...
This paper presents a study and a complete design of stand-alone photovoltaic system for providing the electrical loads in Addis Boder health center according to daily energy requirements. The procedure of attaining solar energy required planning, opting and establishing arrangement of various elements those are incorporated in the mechanism to confirm the demand prediction. In this work, HOMER software...
To support distribution planning and operations engineers, this paper describes an optimal methodology for specifying smart inverter settings that will improve PV integration into distribution systems. The dynamic nature of the distribution system requires that a range of load and solar conditions be considered for this purpose. Time-series analysis was performed using OpenDSS to determine the overall...
A hybrid power system modeled in Matlab/Simulink environment is presented in this study. This model includes a hybrid system consisting of wind and solar panels and it is connected to the smart grid through a 6-switched 3-level inverter. A 6-switched 3-level inverter is preferred in this study as an inverter due to its success in minimizing the harmonics. The signals required for the operation of...
A topology of series active power filter (SAPF) based on a single phase half-bridge cascaded multilevel inverter is proposed to compensate voltage harmonics of the load connected to the point of common coupling (PCC). The main parts of the inverter are presented in detail. Any voltage reference can be easily obtained by a simple control with the proposed inverter. Therefore, the inverter acts as a...
This paper investigates the operation of different demand sector such as residential, commercial and industrial load profiles when supplied with a grid tied micro-hydrokinetic pumped-hydro storage (MHK-PHS) hybrid system. The aim is to explore the demand sector which is more favorable to the proposed grid-tied MHK-PHS hybrid system under the time-of-use (TOU) tariff scheme. Hence, the optimum configuration...
This paper presents a modeling and simulation, in Matlab/Simulink environment, of a stand-alone solar PV system in order to analyse its performance under irradiation and load variations. Indeed, to supply an alternative load with a sinusoidal line without harmonic distortion under weather conditions, a MPPT (Maximum Power Point Tracking) algorithm has used to control a DC-DC boost converter to generate...
In this work a hybrid storage system, composed by a battery and supercapacitors, is evaluated in order to improve the voltage output signal of a Photovoltaic Energy System. First, it is presented a strategy to load the storage system, followed by a discussion of the strategy to take the energy from the storage system. Finally, the results of applying the former strategy to improve the output signal...
The concept of transformerless inverters has become a future trend for single phase photovoltaic grid — tied systems. The major factor to be considered while employing transformerless inverters in such applications is the leakage currents. The lack of transformers in inverters, implemented between PV panel and grid results in a galvanic connection and thus there arises problems due to leakage currents...
A basic approach for grid connected DC/AC microgrid modeling using photovoltaic (PV) panels and Energy storage units accessible in this document. The system consists of a two stage power conversion. Solar PV supplies power for both DC and AC loads. Manufacturer datasheet is used for modeling the PV panel that could help to give a suitable way for the researchers to explore the PV generation issues...
Medium voltage multilevel inverters are used for high power applications. These will show a significant impact on the system dynamics because of their vast size and high power demand. Switching models for these multilevel inverters are already available through Mat lab/Simulink. Anyway Dynamics in the system cannot be analyzed using the switching models in Power system. So Load modeling and analysis...
In this proposed work a basic unit is developed. A single unit can generate two positive and a zero level at the output. As this basic unit can develop positive levels, for negative levels, H-bridge is in addition connected to it. This is advance cascaded H-bridge multi-level inverter. With this it is possible to generate all output levels i.e. positive, zero and negative level. Also in this paper...
Nowadays the distributed generation is being vastly implemented due to its various advantages. It is made more promising by connecting it in parallel with a non renewable source. Normally Photo Voltaic (PV) generation gives the power required by the load. The output of the PV is varying due to various reasons like temperature, irradiation, etc. Distributed generation using micro turbine is a potential...
An inverter with an output LC filter can be used for generation of sinusoidal output voltage with low harmonic distortion, suitable for distributed generation systems. However, with the growing number of electronic devices with rectifiers at the front end of their power supply, the nonlinearities of the load current in power systems are increasing. As such designing an inverter system with a nonlinear...
The multilevel flying capacitor topology is a promising technology for future electric aircraft, where high specific power density power converters are required. Hardware-in-the loop co-design can improve design throughput as more complex implementations of this technology are developed. This paper presents a comparison of hardware-in-the-loop emulation and hardware prototype results for 3-, 5- and...
Flexible AC Transmission System (FACTS) is applied to manage a number of varied situations of the power line. The Unified Power Flow Controller (UPFC) as one of the FACTS is used in order to keep conditions of the power line. The UPFC consists of two components. One is connected in parallel to the power line, and the other is connected in series. By the parallel system, the reactive power and 3-phase...
Interior permanent magnet synchronous motors (IPMSMs) are controlled by either a rotor position sensor or a sensorless control method, which enables highly efficient operation. The voltage-current phase difference control method is a sensorless control method that offers low cost and a simple control system, which is based on V/f control. However, speed ripple occurs under a fluctuating load because...
An online transmission line impedance parameter identification method is proposed for distributed generation (DG) in this paper. The droop control is adopted for local controller of DG units, which aims to realize accurate power sharing. The impedance parameter model is established by producing a small perturbation on load power after transforming voltage and current to dq coordinate, thus the line...
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