A Back-Stepping Control Method for Modular Multilevel Converters

Ahmadijokani, Mohammadali; Mehrasa, Majid; Sleiman, Mohammad; Sharifzadeh, Mohammad; Sheikholeslami, Abdolreza; Al‐Haddad, Kamal

doi:10.1109/tie.2019.2962455

Cited by 59 publications

(28 citation statements)

References 31 publications

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“…Compared to several different models, the equivalent circuit model is most feasible and simple technique for reliable operation of the MMC. The equivalent circuit model has several advantages compared to other techniques such as easy in converting the control variables, takes less computational time and can be easily converted to decoupled models [31][32]. The figure 3 32…”

Section: B Mathematical Modelmentioning

confidence: 99%

Enhanced Voltage Sorting Algorithm for Balancing the Capacitor Voltage in Modular Multilevel Converter

Ismail

Kaliyaperumal²

2021

IEEE Access

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In this paper, an enhanced voltage sorting algorithm is proposed for balancing each sub module capacitor voltage in modular multilevel converter (MMC). However, the submodule (SM) voltage strategy becomes more complex when it increases to a number of levels, which eventually increases voltage ripples and circulating current. In order to overcome this problem, an enhanced voltage sorting algorithm is proposed, which implies an enhanced control logic function for capacitor voltage balancing of the converter. The switching pattern of each SM floating capacitor is determined based on the modulating signal methodology, which is then compared with the hybrid state condition using arm current direction in the MMC. Additionally, the generated hybrid signals are once again compared with the dynamic implicit number by conjoining the switching logic state variables. Due to this comparison of logic function, the capacitor voltage is balanced properly and reduces the capacitor ripple voltage to a permissible limit compared to the conventional method. Hence, compared to other balancing techniques, the circulating current is reduced by using conventional control techniques. The desired pulse signals for the power devices are obtained based on the multi carrier pulse width modulation techniques. The superior performance of the proposed algorithm is tested using MATLAB/Simulink software and real time laboratory hardware setup for different load conditions. Apart from this, the effective performance of the proposed method has been validated in the HVDC transmission system.

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Section: B Mathematical Modelmentioning

confidence: 99%

Enhanced Voltage Sorting Algorithm for Balancing the Capacitor Voltage in Modular Multilevel Converter

Ismail

Kaliyaperumal²

2021

IEEE Access

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“…In addition to the dynamic parts in (25)‐(28), the proposed control functions are also consisted of the reference components that are designed in this sub‐section. Unlike the Reference 26‐31 in which the reference components have been driven through inserting the steady values within the dynamic models of the used converters, the proposed reference components in this paper are achieved through using the small signal linearization for the dynamic model of (1)‐(5). Using the small signal linearization for (1)‐(5), it can be obtained,

R normalΔ i_{d} - normalΔ ω {Li}_{q}^{*} - ω^{*} L normalΔ i_{q} - normalΔ u_{d} v_{dc}^{*} - u_{d}^{*} normalΔ v_{dc} + normalΔ v_{d} = 0

R normalΔ i_{q} + normalΔ ω {Li}_{d}^{*} + ω^{*} L normalΔ i_{d} - normalΔ u_{q} v_{dc}^{*} - u_{q}^{*} normalΔ v_{dc} + normalΔ v_{q} = 0

0 = normalΔ i_{normali 1} - normalΔ i_{L 1} u_{1}^{*} - i_{L 1}^{*} normalΔ u_{1}

0 = v_{normali 1}^{*} normalΔ u_{1} + normalΔ v_{normali 1} u_{1}^{*} - normalΔ v_{dc}

…”

Section: Proposed Control Strategymentioning

confidence: 99%

“…This superiority is related to the dynamic parts of proposed controller that are separately obtained based on guaranteeing the global asymptotical stability of the hybrid microgrid system. Moreover, the proposed control strategy contains a novelty compared with the previous Lyapunov‐based control methods in Reference 26‐32. In fact, the direct Lyapunov method (DLM) is combined with the small signal linearization (SSL) to uniquely approach to the steady stead parts of proposed control functions.…”

Section: Introductionmentioning

confidence: 99%

Lypunov theory combined with small signal linearization for regulated operation of a hybridDC/ACmicrogrid

Souraki

Radmehr

Rezanejad

2020

Int Trans Electr Energ Syst

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Summary This paper proposes a new control strategy for enforcing a AC‐DC hybrid microgrid to attain stable responses in both steady state and dynamic operating conditions. The proposed controller is designed based on combining direct Lyapunov method and small signal linearization (SSL). The dynamic parts of converter control functions are achieved through providing the global asymptotical stability of the hybrid microgrid by using its total saved energy function. Then, the steady‐state components of the controller, unlike other existing Lyapunov‐based methods, are obtained according to SSL‐based mathematical terms as the main novelty of this paper. This novelty simultaneously provides several contributions within the proposed control technique structure as (a) the direct control of the PCC voltage frequency and DC‐link voltage errors, (b) the enhanced decoupling feature for DC/AC converter current, and (c) the direct control of the input voltage error for bidirectional DC/DC converter. Finally, comparative simulation results in MATLAB/Simulink software are presented to verify the superiority of proposed controller combined with SSL under AC and DC load variations, discharging/charging of storage unit, different grid power factors and AC loads shared among grid side and DC sources.

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“…Modular multilevel converters (MMCs) have become attractive to industries in recent years for their modularity, which is vital for repair and maintenance due to simple exchange of the affected modules by new ones. Other advantages that have contributed to MMCs' growing popularity include voltage scalability, lower total harmonic distortion (THD), higher quality of output voltage and current waveforms, fault tolerance, and redundancy [13,14]. Reducing the power losses in semiconductor switches and the sizes of filters are the other useful features of MMCs [15,16].…”

Section: Introductionmentioning

confidence: 99%

ZPUC: A New Configuration of Single DC Source for Modular Multilevel Converter Applications

Arazm

Al‐Haddad

2020

IEEE Open J. Ind. Electron. Soc.

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Z packed U-cell (ZPUC) converter topology is presented in this paper as a new type of multilevel converter topology that can be operated in a single phase as well as in three-phase configurations while using a single DC source. Since each U-cell includes two switches and one capacitor, in this topology, three U-cells are needed to generate 5 or 7 voltage levels. Moreover, the configuration proposed for the ZPUC is more appropriate for high-power application modular multilevel converters (MMCs) to increase the voltage levels compared to other topologies. Accurate voltage balancing on small-sized auxiliary capacitors is due to integrated modulation strategy without using additional controllers; additionally, the reduction of total harmonic distortion (THD) in AC currents for higher voltage levels is an advantage of this configuration. A full topology sequence of operation and performance analysis of ZPUC based on the 5-L inverter is investigated in Matlab-Simulink and experimentally validated on a 3 kVA prototype. The obtained results illustrate the good dynamic performance of the proposed topology and the implemented integrated switching pattern voltage balancing. INDEX TERMS ZPUC topology, modular multilevel converter (MMC), ZPUC-MMC active voltage balancing, power quality, reliability.

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A Back-Stepping Control Method for Modular Multilevel Converters

Cited by 59 publications

References 31 publications

Enhanced Voltage Sorting Algorithm for Balancing the Capacitor Voltage in Modular Multilevel Converter

Enhanced Voltage Sorting Algorithm for Balancing the Capacitor Voltage in Modular Multilevel Converter

Lypunov theory combined with small signal linearization for regulated operation of a hybridDC/ACmicrogrid

ZPUC: A New Configuration of Single DC Source for Modular Multilevel Converter Applications

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