A Low Voltage Single Phase Online Uninterruptible Power Supply System Based on APFC and Fuzzy PID Algorithm-Shengxian Xu 1, Chen Li 2, Yuru Wang 1,*, Baoying Li 1 1School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, P.R China 2School of Electrical Engineering and Telecommunications, University of New South Wales (UNSW Sydney),

A Low Voltage Single Phase Online Uninterruptible Power Supply System Based on APFC and Fuzzy PID Algorithm

Shengxian Xu 1, Chen Li 2, Yuru Wang 1,*, Baoying Li 1

1 School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, P.R China 

2 School of Electrical Engineering and Telecommunications, University of New South Wales (UNSW Sydney), NSW 2052, Australia

ABSTRACT 

The Uninterruptible Power Supply (UPS) is a kind of power supply with electric energy storage, but most UPS systems bring harmonic pollution to the grid, and the power factor is inaccurate in the boost circuit, the output voltage is unstable. Therefore, an active power factor correction circuit (APFC) based on the current and voltage double closed-loop structure is designed in the boost circuit; besides, the fuzzy PID control algorithm is also proposed in the inverter circuit. The effectiveness of the proposed method can be verified by the computer simulation and real experiments, and there are four main results as follows. Firstly, the actual power factor of the UPS system can reach more than 0.996 with APFC correction circuit; then, the UPS system has the strong robustness and the shorter response time; in addition, the voltage regulation rate of the system remains at 0.083% and the load regulation rate is around 0.056%. Finally, the designed UPS system can provide the stable 36V ± 0.2V (50 ± 0.2Hz) AC power.

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PERU está CREANDO "Un Nuevo Puente" entre Sudamérica y Asia: PUERTO DE CHANCAY Y MÁS

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INTERSOLAR BRASIL 29 à 31 DE AGOSTO 2023 – SÃO PAULO, BRASIL-Intersolar South America Sao Paulo on 29 to 31 August 2023

 

INTERSOLAR BRASIL 29 à 31 DE AGOSTO 2023 – SÃO PAULO, BRASIL-Intersolar South America Sao Paulo on 29 to 31 August 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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