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quarta-feira, 30 de agosto de 2023

Research on Control Strategy of High-power Three-phase Combined Inverter-고전력 삼상 복합 인버터 제어 전략 연구-BY ZHANG HUAYING August, 2020 Department of Electrical Engineering Graduate School of Konkuk University


Thesis for Degree of Master Supervisor: Prof. Younghoon Cho 

Research on Control Strategy of High-power Three-phase Combined Inverter 

Submitted by ZHANG HUAYING 

Department of Electrical Engineering Graduate School of Konkuk University


ABSTRACT 
Research on Control Strategy of High-power Three-phase Combined Inverter Zhang Hua Ying Department of Electrical engineering Graduate School of Konkuk University 

Three-phase voltage-type inverters are used in various occasions, such as static reactive power compensator, uninterruptible power supply distribution network development system, motor control, etc. In today's world where energy is scarce, research on inverters and their control technology is of great significance and is gaining more and more attention. People have higher and higher requirements for inverter power supplies. High-performance, high-reliability high-power inverters are one of the development trends of inverter power supplies. In the high-power inverter power supply, the current on the main circuit power device is relatively large, which can reach hundreds of amps, or even thousands of amps. There are two main ways to increase the capacity of the inverter power supply. And parallel technology using inverters to achieve power modularity. This article takes 30kVA combined three-phase inverter as the research object, adopts PID control method, mainly studies the waveform control of high-power three-phase inverter, and focuses on the main circuit structure and system of high-power three-phase inverter. The mathematical model and waveform control were analyzed and studied in detail. The structure of the three-phase combined inverter suitable for high power is analyzed, the main circuit design of the combined threephase inverter with 30KVA is given, and the combined three-phase inverter established and analyzed under different coordinate systems The mathematical model of the model is simulated and studied according to the parameter settings.


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quarta-feira, 23 de agosto de 2023

Задачник по теории линейных электрических цепей-Problemas sobre a teoria de circuitos elétricos lineares-Shebes M.R., Kablukova M.V.


 

Livro de problemas sobre a teoria de circuitos elétricos lineares 
Shebes M.R., Kablukova M.V. 1990

 O livro fornece um breve material de referência na forma de disposições e relacionamentos básicos, fórmulas de cálculo, tarefas típicas com soluções e explicações detalhadas, exemplos de aplicação de métodos básicos para cálculo de circuitos elétricos em modos estacionários e transitórios, A 4ª edição (3ª 1982) é complementada com problemas para cálculo de filtros polinomiais em relação a parâmetros operacionais, circuitos RC ativos, filtros ARC, etc.

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sábado, 19 de agosto de 2023

Bidirectional interleaved current-fed resonant converter with reduced size of output filter for Fuel cell electric vehicles -출력필터의 크기를 줄인 연료전지 자동차용 양방향 인터리브드 전류원 공진형 컨버터 author Moon Dong-ok=


 





Bidirectional interleaved current-fed resonant converter with reduced size of output filter for FCEV 출력필터의 크기를 줄인 연료전지 자동차용 양방향 인터리브드 전류원 공진형 컨버터 

 Author Moon Dong-ok 
Issue Seoul: Seoul National University of Science and Technology, 2015 
 Dissertation Thesis (Master's) -- Department of Electrical and Computer Engineering, Graduate School of Seoul National University of Science and Technology 2015 Year of issue 2015

ABSTRACT 
 Recently, eco-friendly cars such as an Electric Vehicles (EV), Hybrid Electric Vehicles (HEV) and Plug In Hybrid Electric Vehicles (PHEV) are attracting increasing attention as a solution of environ-mental pollution, global warming and exhaustion of fossil fuels. The low voltage dc/dc converter (LDC) provides power to 12V loads such as the head lamps, wiper blade motor, electronic power steering (EPS), radio system etc. and charges a 12V auxiliary battery from a high voltage battery(200~400V). This application requires an efficient (usually, higher than 90%), compact and light weight dc/dc converter. Also, due to safety and high step down conversion ratio galvanic isolation is generally required. This study proposes a bi-directional interleaved current-fed resonant converter (CRC) with reduced size of the output filter for a fuel cell electric vehicle. The proposed CRC achieves zero-current switching turn on and off of switches and diodes and makes ripple current of the output capacitor theoretically zero. As a result, the cost and volume of the output capacitor are significantly reduced. The two-stage power conversion technique is also applied for wide input and output voltage range operations. A 2kW prototype of the proposed converter is built and tested to verify the validity of the proposed operation
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