Abstract
This paper proposes a new cascaded multilevel converter topology based on three-phase H bridge cells with a common DC-link structure. The proposed multilevel converter topology main advantages, compared with literature renowned multilevel converters topologies, are discussed in the paper, such as modularity, construction, implementation cost, and DC voltage ripple mitigation. Despite presenting an elementary structure and easy implementation, the use of classic PWM switching strategies is not feasible for this topology, causing the appearance of several short-circuit states between its capacitors. Thus, a graph theory algorithm combined with a model predictive control is also proposed in this work to identify and avoid the new cascaded multilevel converter short-circuit switching states and, concomitantly, guaranteeing the converter output power quality. In order to validate the presented topology applicability, a low voltage synchronous static compensators (STATCOM) with an optimal switching vector model predictive control (OSV-MPC) is implemented in a hardware-in-the-loop platform. The real-time experimental results prove the proposed multilevel topology and the OSV-MPC control strategy effectiveness.
Highlights
In the last decade, the electric energy demand increase caused by the use of high-power industrial loads, the incentive to decentralized generation, as well as the need for better energy generation systems integration, including renewable energy sources, have presented themselves as major challenges for the electrical systems’ operators [1,2]
The topologies were applied as a static compensators (STATCOM) device with similar characteristics and the same voltage and current levels
Described previously, and the CHB uses a classical set of linear controls, with a combination of global and cluster DC voltage balancing, well established in the literature [7,52], combined with a classical multicarrier phase shift pulse width modulation (PSPWM)
Summary
The electric energy demand increase caused by the use of high-power industrial loads, the incentive to decentralized generation, as well as the need for better energy generation systems integration, including renewable energy sources, have presented themselves as major challenges for the electrical systems’ operators [1,2]. Encouraged by this technological demand for power electronic devices, specific equipment has been developed to improve electrical energy quality and stability and reliability of power networks. The rapid expansion in electricity demand culminated in a voltage level increase, in order to reduce costs in the cable infrastructure and, the values referring to losses by Joule effect in electrical installations. This voltage increase could exceed the semiconductor switches’ physical limits, making it impossible to use conventional converters directly connected to medium voltage grids [8,9]
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