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ABSTRACT
Research on Control Strategy of High-power
Three-phase Combined Inverter
Zhang Hua Ying
Department of Electrical engineering
Graduate School of Konkuk University
Thesis for Degree of Master
Supervisor: Prof. Younghoon Cho
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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