Multilevel Back-to-Back Cascaded H-Bridge Converter with Model Predictive Control

Oliveira, Felipe Silva; Encarnação, Lucas Frizera; Camargo, Renner Sartorio; Pena, Emilio Jose Bueno

doi:10.1109/iecon.2019.8927557

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…In most cases of CCS-MPC, pulse width modulation (PWM) scheme is used to generate a control signal based on the duty cycle [23,24]. On-line optimisation of the system is the primary concern of this strategy handled by explicit MPC (EMPC) [25][26][27]. EMPC produces some feedback control laws and a tree search to reach the state feedback laws, requiring a large storing capacity and short prediction horizons.…”

mentioning

confidence: 99%

Generalised predictive controller (GPC) design on single‐phase full‐bridge inverter with a novel identification method

Memeghani

Ghamari

Jouybari

et al. 2022

IET Control Theory & Appl

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The design of an on-line generalised predictive control (GPC) technique with a novel identification method is presented in this paper for a single-phase full-bridge inverter in the presence of different disturbances. The controller uses system discrete-time model to reach the control variables with a prediction over these values, followed by computing a cost function for control aims. However, in this controller, the need for the mathematical model of the system is removed since the black-box identification strategy is used. Moreover, GPC structure has many advantages including low computational complexity, systematic design procedure, and fixed switching frequency that makes it a good alternative for practical applications. Various disturbances can have a negative impact on a DC-AC inverter; thus, considering robust dynamics and ease of implantation, the GPC scheme is used along with an improved exponential regressive least square identification algorithm as an adaptive strategy in the controller. Moreover, the prediction horizons of this controller have been increased, resulting in its low steady-state error and better performance. Furthermore, harmonics in the sinusoidal signal can decrease the total efficiency of the system; thus, an LC filter is used to reduce the level of total harmonic distortion. However, the stability of the filter is the most challenging issue in designing a suitable controller. Finally, the strength of the current controller is verified using experimental and simulations results. INTRODUCTIONNowadays, power inverters are utilised in connecting renewable energy sources for power generation. Single-phase inverters are well-known and used in various industrial applications. A DC-AC H-bridge voltage source inverter (VSI) topology is selected here to feed different linear loads [1,2]. The generated sinusoidal waveform of an inverter must have a constant amplitude and frequency with a minimal rate of THD. To limit the THD level, various filters are suggested including LLCL, L, LC, and LCL. In fact, characteristics of the LC-type filter, make it can be the most suitable one for stand-alone structures (load connected) [3][4][5][6]. Stability proof of the filter is the primary concern which can harm system dynamics; thus, two strategies were presented for this challenge: passive and active damping schemes.In passive damping strategy, the inductor is modelled with a series resistor, while total system efficiency can be affected. However, for the second scheme, a closed-loop control strategies have been introduced [7]. However, the following This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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confidence: 99%

Generalised predictive controller (GPC) design on single‐phase full‐bridge inverter with a novel identification method

Memeghani

Ghamari

Jouybari

et al. 2022

IET Control Theory & Appl

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“…This characteristic is essential for building a three-phase sinusoidal wave with low total harmonic distortion (THD), a fundamental condition for the use of the CHB-SDC in several power electronics equipment, as the STATCOM mentioned above. Thus, with the graph theory applied to this five-level converter, a computer algorithm was developed, capable of gathering each one of the 4096 possible paths and mapping the converter's unipolar switching states [9,11,17,38]. However only 640 states are useful for equipment operation, that is, these combinations do not generate short-circuit states.…”

Section: Converter Short-circuit States Analysismentioning

confidence: 99%

“…For the continuation of the mathematical development, it must be considered that the source voltage value is the same for the next time step and that the source current between two consecutive time steps will be the same for the next instant. These estimates are due to the power grid frequency being much lower than the switching frequency [17,46].…”

Section: Statcom Model Predictive Controlmentioning

confidence: 99%

“…The active and reactive reference powers, P * (k + 2) and Q * (k + 2), are determined by the system operator and used to reference currents calculation through instantaneous power theory [51]. The required capacitor power p loss is added to the active power reference becoming in the total active power reference P * T(K+2) , as shown in Equation (17).…”

Section: Statcom Model Predictive Controlmentioning

confidence: 99%

“…In most cases, the applications mentioned use multilevel converters, depending on the voltage level involved, connecting rectifier stages to inverter stages through a DC-link. The use of multilevel CHB in some applications requires galvanic isolation stages, usually provided by high or low-frequency transformers to avoid short-circuit stages inherent to these topologies [16,17]. In this CHB-single DC (SDC) proposal, if there is a possibility of implementing a three-phase converter structure and using a reduced number of components, the isolation stages could be eliminated, further reducing the cost of these applications.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Novel Cascaded Multilevel Converter Topology Based on Three-Phase Cells—CHB-SDC

et al. 2020

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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.

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Asymmetric Single DC-Link Cascaded H-Bridge Multilevel Converter with Model Predictive Control

Camargo

Pena

Encarnação

2021

2021 IEEE 15th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG)

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Multilevel Back-to-Back Cascaded H-Bridge Converter with Model Predictive Control

Cited by 9 publications

References 12 publications

Generalised predictive controller (GPC) design on single‐phase full‐bridge inverter with a novel identification method

Generalised predictive controller (GPC) design on single‐phase full‐bridge inverter with a novel identification method

A Novel Cascaded Multilevel Converter Topology Based on Three-Phase Cells—CHB-SDC

Asymmetric Single DC-Link Cascaded H-Bridge Multilevel Converter with Model Predictive Control

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