The Actual Conditions & The View of Inverter Driving Technology at The Energy-Saving.
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The paper presents the following issues. The 1st is the various elements and the development of the inverter drive technique, watching its history. The 2nd the transition of energy-saving and the appearance and roll of the inverter as energy-controller. The 3rd is the technical subjects and the solution instances of the inverter drive which is applied to energy-saving drive. The last is the view of the future subject and image of the ideal inverter.Keywords:
Grid-tie inverter
The inspiration for the use of the resonant inverter shoots from an aspiration to minimise the switching losses in the inverter devices. This paper portrays an exhaustive study on losses in the resonant DC link inverter. Equations for accessing the diverse losses in the resonant DC link inverter and a corresponding hard switching inverter are developed. Based on these equations, a design optimization is executed for the DC link inverter to attain the optimum standards of the link components. Finally, an evaluation of the losses in the resonant inverter and the hard switching inverter is presented.
Grid-tie inverter
Resonant inverter
Switching power
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Abstract Y-typed networking with three winding-coupled inverter is a brand-new DC-DC and DC-AC inverter. The inverter has a simple topology structure. However, it owns powerful functions. The inverter, with two Y-shaped structures, has not adopted two independent circuits, which are replaced by some new topology parts, such as the switches, adding up to control the current. Obviously, it has now become a single-stage inverter. The improved inverter has also been called DYSI, the Differential Y-source Inverter, for it combines the Differential Boost Inverter with the Y-source Inverter. The improved inverter would produce high AC output voltage, solving the problems caused by the low output voltage in photovoltaic inverters while increasing voltages to connect with the national grid. The modulation of the improved inverter is the half-sine wave, which drives one coupled and two switches in the branch to conduct at high times. The improved inverter also has some defects. The inverter would produce abrupt energy leakage because of the incomplete coupling of inductances. Similar to other inverters, the process during which the switches turn on and turn off would inevitably generate power loss, leading to a much lower output than the ideal design. In contrast, the deficiency could be decreased by adding two diodes without loss to the circuit topology.
Grid-tie inverter
Sine wave
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----------------------------------------------------------------VII Chapter 1: Resonant Inverter Background-------------------------1-16 1.1: Introduction------------------------------------------------1 1.2: Classification of Inverter---------------------------------1 1.3: Resonant Inverter------------------------------------------4 1.4: Classification Resonant Inverter-------------------------5 1.5: Analysis of load Resonant Inverter----------------------9 1.5.1: Series Resonant Inverter Scheme----------------------9 1.6: Analysis of switched Resonant Inverter-----------------12 1.6.1: ZVS Operation in Full Bridge--------------------------13 1.7: Motivation of the work------------------------------------15 1.8: Organization of the Thesis--------------------------------16 Chapter 2: Simulation of Power Inverters--------------------------18-27 2.1: Square Wave------------------------------------------------18 2.2: PWM Inverter with Bipolar Switching------------------20 2.3: PWM Inverter with Unipolar Switching----------------22 2.4: Load Resonant Inverter------------------------------------24 V 2.5: Zero Current Switching (ZCS)----------------------------26 2.6: Zero Voltage Switching------------------------------------27 Chapter 3: Square wave Inverter Construction---------------------29-34 3.1: Hardware Description--------------------------------------29 3.1.1: Signal Generation for Driving Mosfets----------------29 3.1.2: Charge pump isolation Circuit--------------------------32 3.1.3: Final Full Bridge Inverter Circuit-----------------------34 Chapter 4: Implementing basic Resonant Inverter -----------------37-45 4.1: Fourier analysis of Square Wave--------------------------37 4.2: Constructing LC Filter from Components---------------40 4.3: Determining the Values for Resoant tank----------------42 4.4: Application of Resonant Inverter--------------------------43 4.5: Future Development-----------------------------------------45 Conclusion ----------------------------------------------------------------46
Grid-tie inverter
Resonant inverter
LC circuit
RLC circuit
Square wave
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Energy conservation is one of the most important issues in recent years. According to this trend, the requirement of high-efficient inverter also is increasing nowadays and government tries to localizing the high-efficient inverter. Therefore, our company is proceeding the development of high-efficient DC inverter to apply Hybrid Heat Pump by government project. Most of popular inverter using in industries is AC type inverter. DC type inverter is superior to AC inverter in view of self efficiency as 98% comparing to 80~85% of AC inverter and control precision rate as 0.1%. However, the price is more expensive than AC inverter, so it is recovering by the effort of cost reduction and technology development.
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At this time, what is needed most in electricity is how to use energy sources that can be used continuously and efficiently using an inverter, as it is known that the inverter can be used to convert DC currents into AC, therefore the inverter is a useful tool and can be used as one of the supporting tools to change the current generated from the generator. Therefore, the usage time will be shorter. The testing process to ensure that the inverter works properly, testing is done by testing the time of use of the inverter and retrieving the voltage data, and the output current from the inverter. Based on the data obtained from the test results it was found that, the power capacity capable of being produced by the inverter is 2300 Watts. Forms of waves produced by inverters are sinusoidal waveforms so it is good to be used on equipment with inductive loads. In the test data it is seen that the value of the voltage decreases due to increasing current values in the circuit due to additional loads. In the test results, it can be seen that if there is an additional load on the inverter, the usage time value will be shorter
Grid-tie inverter
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This paper presents a review on recent developments and a summary of inverter technology for single phase grid-connected photovoltaic (PV) systems for power levels up to 5 kW. The functions of inverter include DC–AC conversion, output power quality assurance, various protection mechanisms, and system controls. PV inverters are classified in three categories which are centralized inverter, string inverter and module oriented or micro inverter. Centralized inverter, string inverter and module oriented/integrated inverters are discussed as they are widely used in industrial applications. Based on discussion about these PV inverters, the limitation of centralized and string inverter came out. Centralized inverters have very large central inverter which also includes the large numbers of PV panels joined into series. This structure will produce high voltage. String is made up of PV modules by connecting them in series. Output of the string is then given to an inverter. Overall efficiency is improved compared to centralized inverter method and also there is reduction in size. In module oriented inverter/micro inverter, every solar panel unit has its private inverter. The integration of inverter and solar panel significantly decreases installation costs. It also maximizes the solar energy harvesting and improves safety. When some part of solar panel is covered by shadow of pole, tree etc. then centralized and string inverters can’t work. Micro inverter is cost efficient and effective solution when some panel is partially covered by shadow of tree, poles or tall building. Micro inverter is the best inverter topologies for solar PV module. Keywords: PV inverters, single-phase micro-inverters, single-stage inverters, multiple-stage inverters Cite this Article Asodariya Jeegnasha D, Viranchi Pandya. A Brief Review on Single Phase PV Micro-Invertor System. Journal of Power Electronics and Power Systems (JoPEPS). 2015; 5(2): 55–62p.
Grid-tie inverter
Solar micro-inverter
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A new configuration of the three-phase three-level voltage source inverter has been presented. The proposed inverter is based on the two-level inverter. The inverter is built of one two-level conventional inverter, an auxiliary circuit which comprises of three bidirectional switches, and two bulk capacitor banks. A selected harmonic elimination control scheme is employed to achieve lower harmonic contents in the inverter output waveforms. Two-level inverter switches operate at the line power frequency (50 Hz) whereas the auxiliary circuit switches operate at twice line power frequency (100 Hz). To validate the proposed inverter, a low power prototype inverter has been designed and implemented; analytical, simulation and experimental results have been provided.
Grid-tie inverter
Harmonic
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This paper presents a large capacity inverter for power system apparatus that can simultaneously fulfil the tasks of: inverter loss reduction, harmonic reduction, and system disturbance control. The inverter consists of a hybrid inverter of a GTO inverter and an IGBT inverter. This paper presents the main circuit configuration of this hybrid inverter and outlines the inverter control system. For the purpose of confirming the capabilities of this inverter to solve the second and third tasks, the authors performed computer simulation of hybrid inverter applied to fuel cell power generation using EMTDC (Electromagnetic Transient Simulation Program). Harmonic characteristics in steady state and transient characteristics of system voltage dip are analyzed. The results reveal that the inverter system has capabilities to reduce harmonics and to control system disturbances. The inverter system can contribute to the wider use for power system apparatus.
Grid-tie inverter
Transient (computer programming)
Harmonic
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This paper describes the configuration and operation of a novel and efficient interactive inverter composed of 10 kW inverter units arranged in parallel. The efficiency of a proposed 20 kW inverter is 93% at the rated output power and more than 90% at an output power of more than 3 kW when a transformerless inverter is adopted and the number of inverter units in operation is controlled.
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This paper presents a combination of a quasi-resonant DC-link(QRDCL) inverter and a generalized three-level inverter.QRDCL inverter can provide a zero voltage condition for the power devices.The voltage stres-ses of the power devices and the switching losses of the inverter can be reduced.Generalized multilevel inverter to-pology provides an alternative way in high level inverter implementation.The generalized multilevel topology gives the inverter a self voltage balancing ability without any assistance from extra circuits.Control strategy of a general-ized three-level QRDCL inverter is proposed.Simulation results of the inverter are also presented to prove the feasi-bility of a generalized three-level QRDCL inverter.
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