Abstract
An electric multiple unit (EMU) high-speed train is the dynamic load that degrades the power quality in an electric railway system. Therefore, a power quality improvement system using an active power filter (APF) must be considered. Due to the oscillating load current in the dynamic load condition, a fast and accurate harmonic current-tracking performance is required. As such, this paper proposes the design of a model predictive control (MPC) since the minimization of cost function in the MPC process can suitably determine APF switching states. The design technique of MPC is based on the APF mathematical model. This controller was designed to compensate the time delay in the digital control. Moreover, the synchronous detection (SD) method applied the reference current calculations, as shown in this paper. To verify the proposed MPC, the overall control of APF was implemented on a eZdsp F28335 board by using the hardware-in-the-loop technique. The testing results indicated that the proposed MPC can provide a fast and accurate harmonic current-tracking response compared with the proportional-integral controller. In the load changing condition, the MPC was still effective in providing a good result after compensation. The percentage of total harmonic distortion, the percentage current unbalance factor, and the power factor would also be kept within the IEEE Standard 519 and IEEE Standard 1459.
Highlights
Nowadays, electric multiple unit high-speed trains (EMU high-speed trains) are an important part of the transportation infrastructure
The harmonic mitigation in the electric railway system was tested in two situations
The harmonic producing load in this situation was extremely changed for the electric railway system
Summary
Electric multiple unit high-speed trains (EMU high-speed trains) are an important part of the transportation infrastructure. The power distribution system is the utility supply for EMU high-speed train drives. The EMU high-speed train consists of a single-phase rectifier, three-phase inverter, traction motor drive, facilities in the passenger compartment, and other loads. These components behave like a linear and non-linear load. In [9,10], the EMU-high speed train works in three typical situations. The first situation is during accelerating startup This situation results in a fast increase in the load current. In this situation, the load current decreases rapidly. The load current behavior of the electric railway system is dynamically varied, which significantly affects the power quality in the transient condition. The power quality improvement in the electric railway system must be examined
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