| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 102 === There have been many current control strategies developed so far. They include hysteresis current control, decoupled dq frame current control, space vector current control, and predictive current control. The purpose of these control strategies is to get high-quality current response. Generally, the controllers of voltage source converters usually employ dual-loop control, strategies which include outer voltage control loop and inner current control loop. Inner current controllers can affect the performance of the outer voltage controller.
This thesis proposes a model-free predictive current control (MFPCC) as the inner current control loop to reduce the impact of the system parameters (i.e. resistance and inductance), and replace the traditional pulse width modulator with a simple optimization function to determine the appropriate switching states.
The proposed control strategy is applied for an active filter and a Static Synchronous Compensator (STATCOM) to filter harmonies and to balance the voltage of the point of common coupling respectively. The results have been both verified a by offline simulation with PSCAD/EMTDC and by hardware-in-the-loop simulation with Real Time Digital Simulator (RTDS).
Compared to the results of the traditional MFPCC, the proposed method yields superior performance.
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