Capacitor voltage balancing control of modular multilevel converters with energy storage system by using carrier phase-shifted modulation

Ma, Yajun; Lin, Heyun; Wang, Zhe; Wang, Tao

doi:10.1109/apec.2017.7930946

Cited by 11 publications

(13 citation statements)

References 15 publications

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“…Hence, the constraint is the capacity of the power converter, which is not the emphasis of this paper. As for the SOC equalisation within phase arm, the constraint can be obtained according to (10) as λΔSOC k j_max ≤ ΔP k ji max (28) where ΔSOC kj_max represents the maximum allowed SOC difference without over-modulation as…”

Section: Enhancement Of Soc Equalisation Rate Within Phase Armmentioning

confidence: 99%

“…Hence, λ is determined according to the SM with the greatest SOC inconsistency to the average value, and the optimised tolerance of unbalanced power among SMs is considered in (28). If λ is selected beyond the constraint derived in (28), over-modulation will occur at the MMC side, bringing distortion to the output of MMC-BESS; while if λ is selected below this constraint, the ac and dc modulation indexes would not be fully utilised, slowing down the SOC equalisation rate.…”

Section: Enhancement Of Soc Equalisation Rate Within Phase Armmentioning

confidence: 99%

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Improved capacitor voltage balancing control for multimode operation of modular multilevel converter with integrated battery energy storage system

Wang

Lin

2019

IET Power Electronics

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Modular multilevel converter with integrated battery energy storage system (MMC-BESS) has been proposed for energy storage requirements in high-voltage applications with large-scale renewable energy resources. The MMC-BESS is essentially a three-port converter which can transfer energy between any two of the ac port, dc port, and BESS, constituting multimode operation of the system. Different from conventional MMCs, the state-of-charge (SOC) inconsistency among batteries would magnify the submodule capacitor voltage unbalance issue in the MMC-BESS. In this study, an improved capacitor voltage balancing method applicable for multimode operation of MMC-BESS is proposed by adjusting ac and dc modulation indexes simultaneously. After that, the ratio of ac and dc modulation indexes is optimised to enhance the tolerance of unbalanced power among SMs within phase arm, greatly improving the SOC equalisation rate. Based on the proposed capacitor voltage balancing method, the control structure is given and the dynamic model is conducted for the analytic design of the closed-loop controller. Finally, the simulations and experimental results validate the effectiveness and feasibility of the proposed control strategy.

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Section: Enhancement Of Soc Equalisation Rate Within Phase Armmentioning

confidence: 99%

Section: Enhancement Of Soc Equalisation Rate Within Phase Armmentioning

confidence: 99%

Improved capacitor voltage balancing control for multimode operation of modular multilevel converter with integrated battery energy storage system

Wang

Lin

2019

IET Power Electronics

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“…This circulating current affects the performance and efficiency of the converters [2] [3]. Another drawback of modular multilevel converters is the arm voltage balancing as shown in [4]. Variations in voltages of two arms of same phase and between different phases deteriorates the efficiency of the converter [5].…”

Section: Introductionmentioning

confidence: 99%

Novel Control Technique for Control of Circulating Current in Modular Multilevel Converters

Ali¹,

Ahmed²,

Khan³

et al. 2019

IJEW

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Modular multilevel converters are the prominent candidates for high voltage direct current transmission systems. They offer high flexibility, modularity and flexibility in their operation. The main problem of multilevel converters are the circulating current in the converter and arm's voltage balancing in steady state and dynamic state. An easy and flexible control scheme is introduced in this study which eliminates the even order harmonics in the circulating current and reduces the circulating current. The model is implemented in Simulink/Matlab and the results confirm the efficiency of the proposed model. , the response of the controller is also presented in result section, which manifest its ability to control the current and eliminate the even order harmonics.

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“…That will accelerate the degradation of batteries, resulting in significant reduction of battery life span [12,13]. Then a DC/DC converter (isolated or non-isolated) is used to filter the low-frequency current in submodule B [14][15][16]. The main advantages of non-isolated DC/DC are the simple structure and low cost.…”

Section: Introductionmentioning

confidence: 99%

“…More seriously, the SOC may not converge in some case. For example in [15], the SOC will not converge when the power only transfers between DC side and batteries. Therefore, this paper aims to investigate the submodule voltage regulation method to optimize the SOC balancing control.…”

Section: Introductionmentioning

confidence: 99%

Modified State-of-Charge Balancing Control of Modular Multilevel Converter with Integrated Battery Energy Storage System

Lin

Wang

et al. 2018

Energies

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Modular multilevel converter with integrated battery energy storage system (MMC-BESS) has been proposed for energy storage requirements in high-voltage applications. The state-of-charge (SOC) equilibrium of batteries is essential for BESS to guarantee the capacity utilization. However, submodule voltage regulation can lead to over-modulation of individual submodules, which will limit the efficiency of SOC balancing control. Focusing on this problem, a modified SOC balancing control method with high efficiency is proposed in this paper. The tolerance for battery power unbalance is defined to quantize the convergence of SOC balancing control. Both the DC component and AC component are considered while regulating submodule voltage. The linear programming method is introduced to realize the maximum tolerance for battery power unbalance in different operation modes. Based on the analysis, by choosing appropriate submodule voltage regulation method, the efficiency of SOC balancing control is improved greatly. In addition, the SOC controller is also optimally designed to avoid over-modulation of submodules. Finally, the detailed simulation and experiment results verify the effectiveness of the analysis and proposed control strategy.

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Capacitor voltage balancing control of modular multilevel converters with energy storage system by using carrier phase-shifted modulation

Cited by 11 publications

References 15 publications

Improved capacitor voltage balancing control for multimode operation of modular multilevel converter with integrated battery energy storage system

Improved capacitor voltage balancing control for multimode operation of modular multilevel converter with integrated battery energy storage system

Novel Control Technique for Control of Circulating Current in Modular Multilevel Converters

Modified State-of-Charge Balancing Control of Modular Multilevel Converter with Integrated Battery Energy Storage System

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