Decoupled Current Model and Control of Modular Multilevel Converters

Lizana, Ricardo; Pérez, Marcelo A.; Arancibia, David; Espinoza, José; Rodríguez, José

doi:10.1109/tie.2015.2405900

Cited by 84 publications

(35 citation statements)

References 31 publications

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“…Two ways to implement Method-I have emerged, viz. [73]- [76] and [20], [27]- [31]. The main difference is the choice of the reference Vcijk* used by each SM capacitor voltage controller that ensures capacitor voltage balancing.…”

Section: A Method-i: Internal Voltage Control Scheme Based On Indivimentioning

confidence: 99%

Analysis and Assessment of Modular Multilevel Converter Internal Control Schemes

Wang

Adam

Massoud

et al. 2020

IEEE J. Emerg. Sel. Topics Power Electron.

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Adoption of distributed submodule (SM) capacitors in a modular multilevel converter (MMC) necessitates complex controllers to ensure the stability of its internal dynamics. This paper presents comprehensive analysis and assessment of different proportional resonant (PR)-based control schemes proposed to stabilize the internal dynamics and ensure ac and dc sides power quality of the MMC within a dc transmission system. With the consideration of passive component tolerances, different energy and voltage based control schemes under various conditions are analyzed. It has been established that without vertical voltage balance control, unequal passive component values in the upper and lower arms of the same phase-leg may cause: unbalanced fundamental currents in the arms, unequal dc voltage across the arms, and fundamental oscillations in the common-mode currents that lead to fundamental frequency ripple in the dc link current. The theoretical analysis that explains this mechanism is presented, and is used to show that vertical voltage balancing is necessary for the nullification of arm voltage difference and suppression of odd oscillations caused by capacitive/inductive asymmetry between arms of the same phase-leg. Simulations support the theoretical analysis and the effectiveness of voltage balancing in ensuring correct operation, independent of tolerances of the MMC passive elements and operating conditions. A new direct method for elimination of fundamental oscillations in the common-mode and dc link current is proposed. Experimental results from a singlephase MMC prototype validate the presented theoretical discussions and simulations.

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Section: A Method-i: Internal Voltage Control Scheme Based On Indivimentioning

confidence: 99%

Analysis and Assessment of Modular Multilevel Converter Internal Control Schemes

Wang

Adam

Massoud

et al. 2020

IEEE J. Emerg. Sel. Topics Power Electron.

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“…3(a). A decoupled current controller for the output and circulating current was proposed in [10] in a method that can be extended to other modular topologies such as the Modular Multilevel Matrix Converter of [11]. A circulating current control method based on energy within the arms and controllers on the positive and negative synchronous reference frame was presented in [13] and under unbalanced conditions in [12].…”

Section: A Current Control Methodsmentioning

confidence: 99%

Utilising redundant voltage levels for circulating current control in modular multilevel converters

Konstantinou

Pou

Ceballos

et al. 2015

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society

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Abstract-Control of the circulating current in the modular multilevel converter (MMC) is one of the major tasks for the proper operation of the converter topology. This paper develops a controller for the circulating current of the MMC that utilises the redundant voltage levels in 2N +1 modulated MMCs in order to regulate the current to its reference. The main advantages of the approach are the elimination of control loops that generate the voltages for the control of the circulating current, simple implementation and very fast dynamic performance. The application of the control is also independent of the circulating current reference. The simplicity and effectiveness of the proposed controller is illustrated through simulations and experimental results.

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“…The magnitude of circulating current has a high impact on the arm current. It increases the root mean square (RMS) value of arm current, which will increase power losses and second-order harmonics will result in further generation of other higher-order harmonics that will increase power loss and current stresses on switching devices [14,15]. However, no impact of circulating current is seen on the alternating current (AC) network.…”

Section: Introductionmentioning

confidence: 99%

Control of Output and Circulating Current of Modular Multilevel Converter Using a Sliding Mode Approach

et al. 2019

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The modular multilevel converter (MMC) has been prominently used in medium- and high-power applications. This paper presents the control of output and circulating current of MMC using sliding mode control (SMC). The design of the proposed controller and the relation between control parameters and validity condition are based on the system dynamics. The proposed designed controller enables the system to track its reference values. The controller is designed to control both output current and circulating current along with suppression of second harmonics contents in circulating current. Furthermore, the capacitor voltage and energy of the converter are also regulated. The control of output current is carried out in dq-axis as well as in αβ-axis with first-order switching law. However, a second-order switching law-based super twisting algorithm is used for controlling circulating current and suppression of its second harmonics contents. The stability of the controlled system is numerically calculated and verified by Lyapunov stability conditions. Moreover, the simulation results of the proposed controller are critically compared with the conventional proportional resonant (PR) controller to verify the effectiveness of the proposed control strategy. The proposed controller attains faster dynamic response and minimizes steady-state error comparatively. The simulation of the MMC model is carried out in MATLAB/Simulink

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Decoupled Current Model and Control of Modular Multilevel Converters

Cited by 84 publications

References 31 publications

Analysis and Assessment of Modular Multilevel Converter Internal Control Schemes

Analysis and Assessment of Modular Multilevel Converter Internal Control Schemes

Utilising redundant voltage levels for circulating current control in modular multilevel converters

Control of Output and Circulating Current of Modular Multilevel Converter Using a Sliding Mode Approach

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