Control Strategy to Naturally Balance Hybrid Converter for Variable-Speed Medium-Voltage Drive Applications

S, Aneesh Kumar A; Poddar, Gautam; Paramasivam, Ganesan

doi:10.1109/tie.2014.2341606

Cited by 22 publications

(2 citation statements)

References 23 publications

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“…Level shifted pulse-width modulation (LS-PWM) is used for low harmonics distortion and simple calculation (Adam et al, 2015;Aneesh Kumar et al, 2015).…”

Section: Hierarchical Power Allocation Control Hierarchical Control For the Battery-sc Hessmentioning

confidence: 99%

Hierarchical Power Allocation Control for Star-Connected Hybrid Energy Storage System Using Cascaded Multilevel Converters

Liu

Lyu

et al. 2021

Front. Energy Res.

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Hybrid energy storage system (HESS) using cascaded multilevel converters (CMC) has received increasing attention due to its merits on smoothing power fluctuations for renewable energy systems (RESs). However, CMC-based HESS still faces tough challenges due to asymmetrical ac power distribution. In this paper, hierarchical power allocation control strategy is utilized in CMC-based star-connected HESS to coordinate power between batteries and supercapacitors (SCs). Using the proposed power allocation mechanism, energy management strategy (EMS) with two operation modes can be achieved, which includes SC voltage regulation mode and power compensation mode. In SC voltage regulation mode, SC voltages are regulated to achieve long-term stable operation. Power compensation mode aims to allocate the active power fluctuation and employs SCs to mitigate it. Meanwhile, the principle of the hierarchical power allocation strategy is analyzed to facilitate the accurate control and flexible switching of different operation modes. A series of simulation and experiment tests are executed to demonstrate the performance of the proposed control strategy.

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“…Level shifted pulse-width modulation (LS-PWM) is used for low harmonics distortion and simple calculation (Adam et al, 2015;Aneesh Kumar et al, 2015).…”

Section: Hierarchical Power Allocation Control Hierarchical Control For the Battery-sc Hessmentioning

confidence: 99%

Hierarchical Power Allocation Control for Star-Connected Hybrid Energy Storage System Using Cascaded Multilevel Converters

Liu

Lyu

et al. 2021

Front. Energy Res.

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“…With the development of multilevel technology, hybrid cascaded multilevel inverters have been widely used. Its main circuit topology is also a cascade structure of H-bridge units, but the voltage level and switching frequency of each H-bridge unit are different [4][5][6]. For instance, a new asymmetric cascaded multilevel inverter [7] (ACHB) proposed by Manjreka et al has two H-bridges with an input DC voltage ratio of 2:1.…”

Section: Introductionmentioning

confidence: 99%

Research on Current Backflow of Asymmetric CHB Multi-Level Inverter

Song

Ren

et al. 2020

Electronics

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For the traditional asymmetric cascaded H-bridge multi-level inverters, the conventional hybrid modulation method has the problem of current backflow in a certain modulation index range. Although the monopolar modulation method effectively solves this problem, the high-voltage unit participates in the high-frequency operation in part of the range, which limits the improvement of the switching frequency of the whole system. The hybrid frequency modulation method can reduce the switching frequency of the high voltage unit to a certain extent, but the harmonic characteristics of the output voltage will be affected. In order to solve the above problems, a double frequency modulation method based on level-shifted PWM (LS-PWM) is proposed. On the one hand, it solves the inherent power back filling problem of the traditional hybrid modulation method, on the other hand, it ensures that the output voltage of the inverter has good harmonic characteristics when the switching frequency of the high voltage unit is low. The results of simulation and experiment prove the correctness of the theoretical analysis.

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Modified hybrid modulation strategy with power balance control for H‐bridge hybrid cascaded seven‐level inverter

Kang

Xiao

et al. 2018

IET Power Electronics

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Compared with the traditional cascaded H-bridge multi-level inverters, the hybrid cascaded multi-level inverters have been receiving attention because they can generate more levels with the same number of power cells. However, with the general hybrid pulse width modulation (PWM), the output power distribution between the high-voltage and low-voltage H-bridge cells is extremely uneven in low amplitude modulation, and it may appear that the high-voltage cell feeds power into the lowvoltage cell in some modulation ratio intervals causing the low-voltage cell capacitor voltage boost. To avoid this problem, a method of a modified hybrid PWM strategy with power balance control is proposed. It has achieved the output power balance of H-bridge cells in full amplitude modulation, the occurrence of the phenomena of extremely uneven output power distribution between the high-and low-voltage cells in low amplitude modulation is avoided, and the performance of the inverter is improved. Simulation and experimental results verify the correctness and feasibility of the proposed strategy.

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Control Strategy to Naturally Balance Hybrid Converter for Variable-Speed Medium-Voltage Drive Applications

Cited by 22 publications

References 23 publications

Hierarchical Power Allocation Control for Star-Connected Hybrid Energy Storage System Using Cascaded Multilevel Converters

Hierarchical Power Allocation Control for Star-Connected Hybrid Energy Storage System Using Cascaded Multilevel Converters

Research on Current Backflow of Asymmetric CHB Multi-Level Inverter

Modified hybrid modulation strategy with power balance control for H‐bridge hybrid cascaded seven‐level inverter

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