Abstract
Power quality is one of many issues affecting the traction power supply system. Prominent among the causes of poor power quality is voltage low-frequency oscillation (VLFO). In this paper, a fuzzy-based PI (FPI) controller to optimize the performance of the traction line-side converter (TLSC) and suppress the effect of VLFO is proposed. Firstly, the mathematical model of China’s railway high-speed five single-phase TLSC is developed, and then the FPI control unit is designed based on specific requirements. The fuzzy antecedent and consequence rules were generated based on the expert and previous knowledge of TLSC operation. An offline simulation of the proposed control scheme under different loads and parameters is conducted to verify the designed. To validate the model, the traction power supply system (TPS) is built on the field-programmable gate array (FPGA) real-time digital simulator (FPGA-RTDS), while the FPI control algorithm is load on modeling tech rapid control prototyping (RCP) real-time digital controller (RTDC). Hardware-in-the-loop (HIL), and offline simulation studies between current decoupling (PI) control, sliding mode control (SMC), and the proposed control method confirms in addition to excellent dynamic performance; the proposed method can successfully suppress the effect of VLFO.
Highlights
Poor control system techniques of train traction line-side converter (TLSC) is primarily believed to be one of the factors creating voltage low-frequency oscillation (VLFO) in high-speed railway, and this phenomenon is increasingly becoming a source of concern in electrified railway operation
As reported in [2,3], during the last two and half decades, many smart controllers were coupled with optimization algorithms such as genetic algorithm (GA), and neural network (NN) in turning of state observers and control of power electronics
This study aims at proposing fuzzy-based PI (FPI) control to optimize the operation of TLSC and suppress the effect of VLFO [17]
Summary
Poor control system techniques of train traction line-side converter (TLSC) is primarily believed to be one of the factors creating voltage low-frequency oscillation (VLFO) in high-speed railway, and this phenomenon is increasingly becoming a source of concern in electrified railway operation. The VLFO in the vehicle-grid coupling system (VGCS) can be treated as a continuous stability problem of a large-scale multi-converter system in a specific condition [1]. Scholars are working hard in proposing new control algorithms or changing the current ones hoping at eliminating the power quality issues of the DC-link voltage, and the grid current among them are intelligent controllers. It gives them the ability to apply natural human language in describing problems and their solutions As reported in [2,3], during the last two and half decades, many smart controllers were coupled with optimization algorithms such as genetic algorithm (GA), and neural network (NN) in turning of state observers and control of power electronics.
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