Arm-Balancing Control and Experimental Validation of a Grid-Connected MMC With Pulsed DC Load

Jankovic, Marija; Costabeber, Alessandro; Watson, Alan J.; Clare, Jon

doi:10.1109/tie.2017.2711516

Cited by 18 publications

(4 citation statements)

References 25 publications

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“…Considering Park's transformation matrix, the system in dq0 reference is obtained. Taking into account that, in the equilibrium of balanced systems, the zero component is equal to zero, Equation (4) can be rewritten as system (5), which describes the AC current state variables that should be controlled as follows:…”

Section: Model Of a Modular Multilevel Convertermentioning

confidence: 99%

“…The most recent advancement in the context of converters for HVDC is the Modular Multilevel Converter (MMC) topology. This topology combines the advantages of Voltage Source Converters (VSCs) with increasing voltage levels and lower harmonic production [4][5][6]. The three-phase MMC topology consists of two arms per phase: upper (u) and lower (l) arms, referring to the leg of the converter that generates the voltage over and under the neutral point, as depicted in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Bilinear Quadratic Feedback Control of Modular Multilevel Converters

Costa de Oliveira,

Machado Monaro,

Damm

et al. 2023

Energies

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The present paper introduces the formulation and development of a bilinear quadratic control algorithm for Modular Multilevel Converter (MMCs), with a specific emphasis on achieving internal energy stabilization and balance within the converter. A bilinear average model of the MMC is employed, enabling the separation between the DC voltage and the voltage generated by submodules. The algorithm proposed in this study is formulated using bilinear theory and is founded on quadratic feedback control principles. The stability of the suggested controller is scrutinized using a meticulous mathematical approach based on Lyapunov theory. Subsequently, the theoretical findings are assessed using a comprehensive MMC switching model implemented in Matlab Simscape Electrical. The utilization of a phase-shift PWM technique, accompanied by a sorting algorithm, is considered in the study. Additionally, a comparison between the proposed bilinear controller and a standard PI controller is conducted. The outcomes demonstrate that the proposed controller effectively facilitates the regulation of circulating and AC currents, along with managing the internal energy of MMCs. Consequently, this achievement makes a noteworthy contribution to the field, as it introduces an innovative bilinear control approach capable of stabilizing all the state variables of MMCs converters using a single control law.

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Section: Model Of a Modular Multilevel Convertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bilinear Quadratic Feedback Control of Modular Multilevel Converters

Costa de Oliveira,

Machado Monaro,

Damm

et al. 2023

Energies

View full text Add to dashboard Cite

show abstract

“…The method offers fundamental voltage gain reduction with additional switching losses. Although, the optimal design parameters of the full-bridge MMC [21] and the arm voltage balancing strategy of the half-bridge MMC [22] under the OVM region are investigated, but no distortion or loss scenario is reported. BCPWM or zero sequence injection techniques are applied to MMC in OVM to reduce capacitor voltage ripples and switching losses with additional closed loop controller [23], and to balance submodule arm currents [24] without mentioning energy loss profile.…”

mentioning

confidence: 99%

A Modified Carrier-Based Advanced Modulation Technique for Improved Switching Performance of Magnetic-Linked Medium-Voltage Converters

Rahman

Islam

Muttaqi

et al. 2019

IEEE Trans. on Ind. Applicat.

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The high-frequency magnetic link is gaining popularity due to its light weight, small volume, and inherent voltage balancing capability. Those features can simplify the utilization of multilevel converter (MLC) for the integration of renewable energy sources to the grid with compact size and exert economic feasibility. The modulation and control of MLC are crucial issues especially for grid connected applications. To support the grid, the converter may need to operate in overmodulation (OVM) region for short periods depending upon the loading conditions. This OVM operation of the converter causes increased harmonic losses and adverse effects on overall system efficiency. On top of that, the size and cost of filtering circuitry become critical to eliminate the unwanted harmonics. In this regard, a modified OVM scheme with phase disposed carriers for grid connected high frequency magnetic link-based cascaded Hbridge (CHB) MLC is proposed for the suppression of harmonics and the reduction of converter loss. Furthermore, with the proposed OVM technique, the voltage gain with modulation index can be increased up to the range, which is unlikely to be achieved using the classical ones. Extensive simulations are carried out with a 2.24 MVA permanent magnet synchronous generator-based wind energy conversion system, which is connected to the 11 kV ac grid through a high-frequency magnetic link and a 5-level CHB MLC. A scaled down laboratory prototype is implemented to validate the performance of the converter. Index Terms-Medium voltage multilevel converter, over modulation technique, grid connection, high-frequency magnetic link, wind energy. I. INTRODUCTION IND energy harnessing technology is becoming popular and mature day by day as a potential renewable energy source. It is estimated that the global capacity of wind energy installation will reach up to 104 GW by 2025 [1]. Stand-alone and hybrid wind energy based systems have been gaining Manuscript

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“…Thus, it is more convenient to scale the system to a high voltage level and high power with reduced complexity of hardware configuration comparing to other multilevel converters [21]- [25]. Hence, the MMC has attracted extensive research and became the most popular multilevel topology in medium and high voltage applications [23], [26]- [28]. [29].…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

Power loss management for modular multilevel converters

Qiu¹

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Arm-Balancing Control and Experimental Validation of a Grid-Connected MMC With Pulsed DC Load

Cited by 18 publications

References 25 publications

Bilinear Quadratic Feedback Control of Modular Multilevel Converters

Bilinear Quadratic Feedback Control of Modular Multilevel Converters

A Modified Carrier-Based Advanced Modulation Technique for Improved Switching Performance of Magnetic-Linked Medium-Voltage Converters

Power loss management for modular multilevel converters

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