Abstract
The modular multilevel matrix converter has been proposed as a suitable option for high power applications such as flexible AC transmission systems. Among flexible AC transmission systems, the unified power flow controller stands out as the most versatile device. However, the application of the modular multilevel matrix converter has not been thoroughly analyzed for unified power flow controller applications due to the sophisticated control systems that are needed when its ports operate at equal frequencies. In this context, this paper presents a cascaded control structure for a modular multilevel matrix converter based unified power flow controller. The control is implemented in a decoupled reference frame, and it features proportional-integral external controllers and internal proportional multi-resonant controllers. Additionally, the input port of the modular multilevel matrix converter is regulated in grid-feeding mode, and the output port is regulated in grid-forming mode to provide power flow compensation. The effectiveness of the proposed vector control system is demonstrated through simulation studies and experimental validation tests conducted with a 27-cell 5 kW prototype.
Highlights
In recent years, a series of power quality problems, such as harmonic distortion, voltage swells and sags, and current harmonics, have been arising in power grids due to the development of large-scale applications of non-linear loads, as well as mass integration of renewable energy generation.The increase of power quality problems might have an adverse impact on steady state and dynamic stability, limited transmission capacity, and congestion of lines
This paper presents a novel direct power control system for an Matrix Converter (M3 C) based Unified Power Flow Controller (UPFC)
Simulation results of a 10 MW M3 C based UPFC were obtained to validate the feasibility of the theoretical work proposed in this paper
Summary
A series of power quality problems, such as harmonic distortion, voltage swells and sags, and current harmonics, have been arising in power grids due to the development of large-scale applications of non-linear loads, as well as mass integration of renewable energy generation. The EFM is enabled when the absolute value of the input-port frequency is very close or equal to the output-port frequency In this case, circulating currents and common-mode voltage are used in the control systems to mitigate the oscillations in the floating capacitor voltages [18,23,26]. The proposed control system has all the benefits of conventional vector control systems, which are addressed in the literature [27,28], for the regulation of the voltages and currents of the M3 C including those at the input and output ports. Shunt and series control FACTS capabilities are enabled for the proposed M3 C based UPFC.
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