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

Camargo, Renner Sartorio; Santamargarita, Daniel; Miguel, Alvar Mayor; Bueno, Emilio; Encarnação, Lucas Frizera

doi:10.3390/en13184789

Cited by 9 publications

(8 citation statements)

References 56 publications

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“…The DC-link capacitance design for the m'th module (C dcm ) can be obtained from Equation ( 4) by setting the desired voltage ripple variation ∆V dc and from the already defined variable P T [20], where ω is the angular velocity defined as 2π f g , and M is the number of modules connected in a back-to-back configuration in the converter. The value of ∆V dc can be determined from a defined percentage of the nominal DC-link voltage V dc .…”

Section: Primary/secondary Inductive Filters and Dc-link Capacitancesmentioning

confidence: 99%

“…Recently, also for power electronics-based devices, some researchers proposed the use of graph theory for mapping all the possible switching states of multilevel converters, applied to motor drive [19], static synchronous compensation (STATCOM) [20,21], and solid-state transformers (SST) applications [2]. In fact, these works use the semiconductor switches to map all existing current paths, identifying prohibitive states, resulting in a switching matrix containing only the possible device combinations.…”

Section: Introductionmentioning

confidence: 99%

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Model-Based Predictive Control with Graph Theory Approach Applied to Multilevel Back-to-Back Cascaded H-Bridge Converters

et al. 2022

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The multilevel back-to-back cascaded H-bridge converter (CHB-B2B) presents a significantly reduced components per level in comparison to other classical back-to-back multilevel topologies. However, this advantage cannot be fulfilled because of the several internal short circuits presented in the CHB-B2B when a conventional PWM modulation is applied. To solve this issue, a powerful math tool known as graph theory emerges as a solution for defining the converter switching matrix to be used with an appropriate control strategy, such as the model-based predictive control (MPC). Therefore, this research paper proposes a MPC with the graph theory approach applied to CHB-B2B which capable of not only eliminating the short circuit stages, but also exploring all the switching states remaining without losing the converter controllability and power quality. To demonstrate the proposed strategy applicability, the MPC with graph theory approach is tested in four different types of SST configurations, input-parallel output-parallel (IPOP), input-parallel output series (IPOS), input-series output-parallel (ISOP), and input-series output series (ISOS), attending distribution grids with different voltage and power levels. Real-time experimental results obtained in a hardware-in-the-loop (HIL) platform demonstrate the proposed strategy’s effectiveness, such as DC-link voltages regulation, multilevel voltage synthesis, and currents with reduced harmonic content.

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Section: Primary/secondary Inductive Filters and Dc-link Capacitancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Model-Based Predictive Control with Graph Theory Approach Applied to Multilevel Back-to-Back Cascaded H-Bridge Converters

et al. 2022

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“…The series connection of a fixed number of modules represents an arm [3] of the converter. Based on the number of arms and their relative configuration, different versions of the Modular Multilevel Converter (MMC) can be realized [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…These considerations underline the need for a more detailed study where the possibility to influence the MMC cell power losses should be investigated. In fact, although many authors recognize the common mode reference [5] as a degree of freedom for the MMCs, no analysis of its effect on the cell power losses has been conducted.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Cell Loss Minimization in Modular Multilevel Converters Based on Half-Bridge Modules

et al. 2021

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In the developing context of distributed generation and flexible smart grids, in order to realize electrochemical storage systems, Modular Multilevel Converters (MMCs) represent an interesting alternative to the more traditional Voltage Source Inverters (VSIs). This paper presents a novel analytical investigation of electrochemical cell power losses in MMCs and their dependence on the injected common mode voltage. Steady-state cell losses are calculated under Nearest Level Control (NLC) modulation for MMCs equipped with a large number of half-bridge modules, each directly connected to an elementary electrochemical cell. The total cell losses of both a Single Star MMC (SS-MMC) and a Double Star MMC (DS MMC) are derived and compared to the loss of a VSI working under the same conditions. An optimum common mode voltage injection law is developed, leading to the minimum cell losses possible. In the worst case, it achieves a 17.5% reduction in cell losses compared to conventional injection laws. The analysis is experimentally validated using a laboratory prototype set-up based on a two-arm SS-MMC with 12 modules per arm. The experimental results are within 2.5% of the analytical models for all cases considered.

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“…Model predictive control is adopted as a superior control mechanism in transmission systems to overcome the power interrupts. The optimized switching vectorbased STATCOM has been established to upgrade power quality in the system [25]. A multi modular converter with quadrature voltage compensation control method is used to compute the circulating current and to control huge power imbalances in the system [26].…”

Section: Introductionmentioning

confidence: 99%

Seven Level Voltage Source Converter Based Static Synchronous Compensator with a Constant DC-Link Voltage

Gadupudi

Rao²,

Devarapalli³

et al. 2021

Applied Sciences

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Flexible alternating current transmission system (FACTS) controllers are important to enhance the quality of power in power systems. The stability of a system is achieved via a FACTS device (a Static Synchronous Compensator (STATCOM)). This paper aims to control the losses in the transmission system during peak energy demand circumstances with minimal losses in the economical and functional efficiency of the system. The STATCOM operation of a seven level voltage source converter (VSC) with binary-weighted transformers is proposed for controlling the reactive power variations and terminal voltage changes at dynamic circumstances in the transmission system. The STATCOM is operated at 132 kV and is a 50 Hz AC system with a single DC-Link capacitance and two VSC power circuits. Each VSC circuit consists of three H-bridges with specific switching angle control in order to achieve low total harmonic distortion at the fundamental frequency. The coupled control circuit phenomenon is imperative for computing the switching angle for a stable performance. The dynamic functional improvement efficiency is harvested with a minimum number of switches and transformers used in high voltage and high-power applications. The number of switches, transformers, and capacitors for 132 kV are optimized with a proposed STATCOM operation in seven level VSC with binary-weighted transformers. The simulated results prove that the proposed model significantly improved system performance and stability.

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

Cited by 9 publications

References 56 publications

Model-Based Predictive Control with Graph Theory Approach Applied to Multilevel Back-to-Back Cascaded H-Bridge Converters

Model-Based Predictive Control with Graph Theory Approach Applied to Multilevel Back-to-Back Cascaded H-Bridge Converters

Electrochemical Cell Loss Minimization in Modular Multilevel Converters Based on Half-Bridge Modules

Seven Level Voltage Source Converter Based Static Synchronous Compensator with a Constant DC-Link Voltage

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