Unbalanced Operation Principle and Fast Balancing Charging Strategy of a Cascaded Modular Multilevel Converter–Bidirectional DC–DC Converter in the Shipboard Applications

Chen, Peng; Xiao, Fei; Liu, Jilong; Zhu, Zhichao; Ren, Qiang

doi:10.1109/tte.2020.3016029

Cited by 20 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this paper, this limitation is called the imbalance boundary of MMC-BDC. For a more detailed discussion of the imbalance degree, one can refer to [9]. Under different control strategies, the boundary is different.…”

Section: Fundamentals Of Mmc-bdcmentioning

confidence: 99%

“…Ref. [9] has investigated into the unbalanced operation principle of MMC-BDC. The imbalance boundary is proposed and the unbalanced operation strategy based on common sub-module (SM) voltage control is designed to decrease the voltage stress of the components.…”

Section: Introductionmentioning

confidence: 99%

“…However, in the common sub-module voltage control strategy proposed in [9], the sub-module with lower power suffers unnecessary high voltage stress. On the other hand, in the independent sub-module voltage control strategy in [10], the imbalance boundary is more limited because of the restriction of the sub-module voltage.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lyapunov-Function-Based Feedback Linearization Control Strategy of Modular Multilevel Converter–Bidirectional DC–DC Converter for Vessel Integrated Power Systems

et al. 2021

Self Cite

View full text Add to dashboard Cite

The modular multilevel converter–bidirectional DC–DC converter (MMC–BDC) has been proposed to be utilized in the vessel integrated power system to interconnect the medium voltage bus and the distributed energy storage elements. In the shipboard applications, MMC–BDC faces unbalanced sub-module power operation because of the inconsistent state-of-charge (SOC) of the energy storage elements. Researchers have investigated into the unbalanced operation principle of MMC–BDC and proposed some unbalanced operation control strategies, but these traditional strategies do not perform well in both aspects of operating range and efficiency. Therefore, this paper proposes a novel Lyapunov-function-based feedback linearization control strategy for the independent sub-module voltage control of MMC–BDC, which not only shows wide unbalanced operation range and high efficiency, but also realizes the decoupling and symmetrical control of the sub-module capacitor voltages.

show abstract

Section: Fundamentals Of Mmc-bdcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Lyapunov-Function-Based Feedback Linearization Control Strategy of Modular Multilevel Converter–Bidirectional DC–DC Converter for Vessel Integrated Power Systems

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…In [19], SOC balancing among battery packs is achieved through a lossless operation of the multi-level converter, distributing the dc-to-ac power flow among batteries based on their respective SOC. Investigating the unbalanced operating principle of the studied topology, reference [20] designs a control strategy to optimize component voltage stress by allocating unbalanced module power, accompanied by a novel fast-balancing charging strategy. In [21], a new three-phase battery ESS with a single branch instead of three branches is proposed, eliminating the need for SOC balancing among branches.…”

Section: Introductionmentioning

confidence: 99%

An Analysis and Optimization of the Battery Capacity Difference Tolerance of the Modular Multi-Level Half-Bridge Energy Storage Converter

Pan,

Wang,

Buja

2023

Energies

View full text Add to dashboard Cite

As a power converter of battery energy storage, the multi-level converter and its battery balancing control have received much attention from scholars. This paper focuses on the modular multi-level half-bridge energy storage converter (MMH-ESC), including its topology, working principle, and pulse width modulation (PWM) methods. Under the battery balancing control strategy based on level-shifted carrier PWM (LS-PWM), formulas are derived and calculations are performed to get the charge or discharge of each submodule (SM), thereby obtaining the tolerance for capacity differences among these batteries. A range of battery capacity values that can maintain a balanced state is provided to enhance flexibility in battery configuration and utilization, avoiding the limitation of all batteries to the same capacity. Finally, a new bridge arm modulation wave allocation method is proposed. This method significantly expands the range of SM battery capacity selection and provides a high-tolerance modulation method for the converter under extreme or even fault conditions.

show abstract

“…At first, the Siemens installed the MMC for HVDC system in San Francisco during the year 2010, followed by ABB in Germany during the year 2012 for offshore wind farm applications. So, based on several features such as reliable operation, harmonic performances, modularity, high efficiency, voltage scalability, redundancy, low voltage stress (dv/dt), and low power rated submodules made the converter applicable to HVDC system [8], offshore wind plant [9], multi-terminal system [10], ship board application [11], motor dives, static compensator, and AC transmission system [12]. Furthermore, many researchers are focusing on implementing the converter for large scale photovoltaics applications, microgrid system [13], renewable sourced grid integration [14][15] etc.…”

Section: Introductionmentioning

confidence: 99%

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

Ismail

Kaliyaperumal²

2021

IEEE Access

View full text Add to dashboard Cite

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.

show abstract

Unbalanced Operation Principle and Fast Balancing Charging Strategy of a Cascaded Modular Multilevel Converter–Bidirectional DC–DC Converter in the Shipboard Applications

Cited by 20 publications

References 24 publications

Lyapunov-Function-Based Feedback Linearization Control Strategy of Modular Multilevel Converter–Bidirectional DC–DC Converter for Vessel Integrated Power Systems

Lyapunov-Function-Based Feedback Linearization Control Strategy of Modular Multilevel Converter–Bidirectional DC–DC Converter for Vessel Integrated Power Systems

An Analysis and Optimization of the Battery Capacity Difference Tolerance of the Modular Multi-Level Half-Bridge Energy Storage Converter

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

Contact Info

Product

Resources

About