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Research on 6KVA Three Phase Four Leg Inverter

Author: ChenKai
Tutor: GongChunYing
School: Nanjing University of Aeronautics and Astronautics
Course: Power Electronics and Power Drives
Keywords: aviation static inverter three phase four leg inverter third harmonic injection dual-loop control external characteristic
CLC: TM464
Type: Master's thesis
Year: 2011
Downloads: 227
Quote: 2
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Abstract


The three phase structure is widly used in daily power supply systems. In order to meet the load requirements, direct current need to be converted into three-phase alternating current, so the three-phase inverter is generally used in industrial production activities. Most of AC power supply systems on the air also use three-phase structure. Compared with the civilian electrical equipment, working conditions of aerospace electrical equipment are more complex. How to keep the balance of three phase voltage under antisymmetric loads is an important research direction.Firstly, the researching background and some three-phase inverter topologies which have capacity of taking unbalanced load is introduced, focusing on the three-phase four-leg inverter development status and some control methods. Then working principle of the three-phase four-leg inverter is analyzed. To verify the feasibility of the control scheme, simulation is built to compare two method of sine wave modulation and the third harmonic injection modulation. DC voltage utilization is improved using the third harmonic injection method, and the system has good ability of taking unbalance loads and short working.The small signal model for three phase four leg inverter as well as its control scheme is developed, and a regulation of voltage and current feedback loop is researched. The current inner loop has the characters of simple implementation and rapid dynamic response. Voltage outer loop ensures sinusoidal output voltage with good reliability and steady-state properties. In addition, common methods of improving external characteristic are researched. A new method with resonant controller is introduced. Compared with traditional methods, this new method improves the steady-state performance and saves the cost without the additional control loop. Simulation and experimental results verify the correctness of the theoretical analysis. The system achieves a better output waveform quality, fast dynamic response and precise regulation accuracy and high efficiency.Finally, the main circuit, control circuit, protective circuit, driven circuit and auxiliary power are designd based on the performance requirements of the prototype. Simulation and experimental result of a 6KVA three phase four leg inverter verify the analysis is correct. System shows good performance under balanced and unbalanced load, as well as static and dynamic conditions.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Inverter
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