Article
Engineering, Electrical & Electronic
Futian Qin, Feng Gao, Yi Tang, Tao Xu, Jinyu Wang, Decun Niu
Summary: This article introduces a new nine-arm modular multilevel converter with improved hybrid submodules for middle arms, which can reduce the dc-side voltage, eliminate the dc offset in common mode voltages, and provides a control method for middle arm current. The feasibility and performance characteristics of the proposed 9A-MMC were verified through simulation and experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Tuhin S. Basu, Suman Maiti, Chandan Chakraborty
Summary: This article introduces a hybrid modular multilevel converter (HMMC) for large-scale PV integration, utilizing a distributed maximum power point tracking (D-MPPT) method to extract maximum power from PV panels. The use of zero sequence voltage (ZSV) injection is implemented to address power unbalance issues during partial shading, and the proposed control method is validated through simulation and experimental testing.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Automation & Control Systems
Tianxiang Yin, Lei Lin, Chen Xu, Donghai Zhu, Kaiyuan Jing
Summary: This article proposes a hybrid modular multilevel converter (MMC) topology based on SiC mosfet and Si IGBT. By improving the modulation scheme and introducing a specialized voltage balancing scheme, the performance of the system is enhanced. Simulation and experimental results demonstrate the feasibility of the hybrid MMC and its superiority in terms of cost, loss, and feasibility compared to others.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Govind Avinash Reddy, Anshuman Shukla
Summary: In this article, a new enhanced modular multilevel converter (EMMC) is introduced, which addresses the drawbacks of the conventional modular multilevel converters (MMC). The EMMC, based on a new submodule (SM) structure, is fully modular and requires fewer switches and capacitors. It possesses the features of reduced energy-storage requirement and dc fault-tolerant capability.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Huailong Li, Fujin Deng, Jie Tian, Yu Lu, Gang Li, Frede Blaabjerg
Summary: This article proposes a current integral comparison (CIC)-based power loss balancing control (PLBC) for improving the reliability of modular multilevel converters (MMCs). The proposed control not only improves the power loss distribution in each submodule, but also reduces the temperature fluctuation of semiconductors, significantly improving the lifetime of MMCs.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Hua Mao, Huaping Jiang, Li Ran, Jiayu Hu, Guanqun Qiu, Jingfeng Wei, Haoyu Chen, Xiaohan Zhong, Nianlei Xiao, Liwei Wang, Minxiang Yang
Summary: This article proposes an asymmetrical power module design for improving the reliability of the SMs in MMCs by considering the loading profile. Simulation and experiment results demonstrate that the designed power module can reduce the maximum temperature, decrease total power loss by 5%-8%, and improve chip utilization rate. The proposed module is applicable within a certain range of power factor and modulation index adjustment.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Qian Xiao, Shunfeng Yang, Yu Jin, Hongjie Jia, Josep Pou, Remus Teodorescu, Frede Blaabjerg
Summary: This article proposes a decoupled control scheme for the modular multilevel converter (MMC) to reduce the total harmonic distortion (THD) and eliminate one specific harmonic. By using an improved nearest level control method, a staircase wave is generated and one specific harmonic can be eliminated by adding additional pulses. A decoupled circulating current fuzzy control method is also introduced to suppress the second-order harmonic and balance the energy.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Mohammadali Ahmadijokani, Majid Mehrasa, Mohammad Sleiman, Mohammad Sharifzadeh, Abdolreza Sheikholeslami, Kamal Al-Haddad
Summary: The article introduces a back-stepping method (BSM) in a-b-c reference for establishing stable operating conditions for modular multilevel converters (MMC). The BSM reduces control variable errors in the MMC system and has a feature of circulating current suppression control loops, eliminating the need for additional control loops.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Jianzhong Zhang, Yaqian Zhang, Fujin Deng, Zakiud Din
Summary: This article introduces a promising hybrid modular multilevel converter (MMC) for future multiport HVdc systems, which has the advantages of dc fault blocking and overmodulation capability. To address the voltage deviations issue during overmodulation operations, the structure of self-balancing branches (SBBs) is introduced into the hybrid MMC, and the voltage balancing strategy is improved. Simulation and experimental results demonstrate the effectiveness of the proposed hybrid MMC, with a significant reduction in energy storage requirement (ESR) and power losses.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Multidisciplinary
Mai Diab, Ahmed A. Elserougi, A. S. Abdel-Khalik
Summary: This paper presents a hybrid modular multilevel DC-DC converter topology that successfully solves the issue of capacitors voltage imbalance during DC-DC conversion. The proposed converter can achieve arm energy equalization and operate as a DC transformer.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Automation & Control Systems
Hongqi Ding, Fujun Ma, Rong Han, Lei Wang, Man-Chung Wong
Summary: This article proposes a control method to achieve thermal distribution balance between top and bottom devices, successfully reducing temperature differences and increasing system lifetime.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ahmed Elserougi, Mohamed S. Diab, Ahmed Massoud, Shehab Ahmed
Summary: This article introduces a new topology of modular multilevel converters to reduce component count and complexity in multiphase machines while maintaining power output. Through hybrid designs, further reductions in component count and improved DC-link voltage utilization can be achieved.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Rongdong He, Kai Tian, Zhibin Ling
Summary: The modular multilevel converter-based battery energy storage system (MMC-BESS) plays an important role in the modern power grid and a stepwise balancing control strategy is proposed to address the inconsistency issue of battery cells.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Saurav Dey, Tanmoy Bhattacharya
Summary: A modular multilevel dc-dc converter philosophy is proposed in this article to exchange power between HVdc links of different voltage levels. The converter operates symmetrically in four quadrants, unaffected by voltage polarity, allowing power flow direction/magnitude to remain constant even with reversal of power flow in the HVdc link. The working principle is analytically explained and validated through simulation and experimental results.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Haozhe Jin, Wu Chen, Yeyuan Xie, Liangcai Shu, Yutao Xu
Summary: This article proposes an optimized asymmetric trapezoidal wave (ATW) modulation scheme for a modular multilevel resonant dc/dc converter (MMRDC) to reduce current stress over wide load and voltage ranges. The optimized operating point of MMRDC is derived based on the soft switching characteristic and reactive current analysis, considering low current stress and zero voltage switching constraint. The experimental results on a 4 kW MMRDC prototype verify the correctness and effectiveness of the analysis and the optimized ATW modulation scheme.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Xiaoling Xiong, Yan Zhou, Bochen Luo, Peng Cheng, Frede Blaabjerg
Summary: The power-synchronization control (PSC) method based on active power orientation is a promising solution for high-penetration renewable power generation systems. However, synchronous frequency resonance (SFR) is often found in PSC-controlled converters connected to inductive networks, causing stability issues. The small equivalent resistance of the inductive network and the nonminimum phase effect of loop gains contribute to SFR. This article discusses these issues and proposes a conjugate poles elimination control method to suppress SFR, with improved control bandwidth compared to the virtual resistor method. The theoretical analysis is verified through simulations and hardware-in-loop experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Moein Ghadrdan, Saeed Peyghami, Hossein Mokhtari, Frede Blaabjerg
Summary: This article proposes a simple converter-level structure for measuring the ON-state voltage of every power semiconductor in a three-phase conventional inverter. The proposed circuit enables the development of a hand-held portable monitoring device that can be used independently of the converter. Detailed information is given on how to design and select the components of the proposed monitoring system, along with its optimal operating conditions.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Chaochao Song, Ariya Sangwongwanich, Yongheng Yang, Frede Blaabjerg
Summary: This article proposes a method to identify the faulty switch based on the dynamic characteristics when the open-circuit fault (OCF) occurs in a two-to-three (2/3)-level dual-active-bridge (DAB) converter. A fault-tolerant control scheme based on a complementary-switch-blocking method is also proposed to alleviate the negative effects of OCF. Experimental tests are carried out to verify the theoretical analysis.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Reza Barzegarkhoo, Majid Farhangi, Sze Sing Lee, Ricardo P. Aguilera, Frede Blaabjerg, Yam P. Siwakoti
Summary: The applications of mid-point-clamped multilevel inverters, such as active neutral point-clamped (ANPC) or stacked multicell (SMC) converters, have expanded significantly in recent years. This is due to their better performance, reduced common-mode voltage and leakage current, bidirectional power flow capability, and simplicity in circuit design. However, the dc-link voltage utilization factor is only 50%, requiring an additional front-end boost-integrated circuit to accommodate low and wide varying input voltage. This article proposes a single-stage ANPC-based five-level (5L) boost-integrated inverter that can meet the peak amplitude of the grid voltage even with low and wide varying dc-link voltage.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Shivam Kumar Yadav, Nidhi Mishra, Bhim Singh, P. Sanjeevikumar, Frede Blaabjerg, Massimo Mitolo
Summary: A new multiobjective minimal-drift maximum power point tracking (MOMD-MPPT) technique is proposed for extracting maximum power from a single photovoltaic (PV) array connected to a multilevel converter (MLC). The technique addresses the voltage drift issue commonly associated with conventional MPPT techniques by using a new multiobjective solution. The technique utilizes a new swarm optimization algorithm (NSOA) that combines swarm intelligence and pressure gradient force to achieve minimal drift in the solar MLC. Comparative analysis with well-known MPPT algorithms and experimental validation demonstrate the effectiveness of the proposed MOMD-MPPT technique in improving the system performance in dynamic solar conditions.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Kirti Gupta, Subham Sahoo, Rabindra Mohanty, Bijaya Ketan Panigrahi, Frede Blaabjerg
Summary: This article presents a novel noninvasive anomaly diagnosis mechanism for inverter-based resources (IBRs) in large power systems. It can accurately classify anomalies within 5 ms using locally measured voltage and frequency as inputs. The proposed mechanism provides the fastest decision compared to existing techniques and has been validated on various systems.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Qian Xiao, Hongjie Jia, Yi Tang, Yu Jin, Yunfei Mu, Remus Teodorescu, Frede Blaabjerg
Summary: A dual-layer modulated model predictive control scheme is proposed to achieve fast dynamics and fixed switching frequency for the cascaded H-bridge converter. The scheme reduces the number of evaluated control options for output current prediction by considering each phase cluster as a whole and selecting optimal vectors. Adaptive zero-sequence voltage is injected based on predicted cluster voltage differences to improve cluster voltage balancing speed. The proposed scheme avoids complicated weighting factor design and achieves fixed switching frequency through pulsewidth modulation.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Zhenxi Wu, Hua Han, Jianheng Lin, Shiming Xie, Yao Sun, Zhongting Tang, Frede Blaabjerg
Summary: This article presents a study on the small-signal stability issues of the grid-connected voltage source rectifier (VSR) with resistance-emulating control (REC). The dq-admittance model of the VSR with REC is established, and the stability superiority of the REC-controlled VSR in weak-grid connection is revealed. The analysis shows that the REC-controlled VSR has better adaptability and higher voltage loop bandwidth in weak-grid conditions.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Rohollah Abdollahi, Gevork B. Gharehpetian, Amjad Anvari-Moghaddam, Frede Blaabjerg
Summary: This article proposes a new simple pulse multiplication circuit (SPMC) with low current stress to upgrade a normal 20-pulse autotransformer rectifier (20PAR) to a 40PAR. The SPMC includes two tapped interphase reactors and two additional diodes with lower conduction losses. Compared to conventional pulse multiplication circuits, the proposed SPMC does not require a zero-sequence blocking transformer, making it simpler to implement. Simulation and experimental results show that the input current's total harmonic distortion using 40PAR is less than 3%, meeting the DO-160G requirements for aviation applications.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Yubo Song, Subham Sahoo, Yongheng Yang, Frede Blaabjerg
Summary: This article proposes a probabilistic risk framework that considers both stability and reliability simultaneously in the realm of microgrids. This framework can quantify the operation risk of microgrids and provide a more intuitive approach to their design.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Moein Ghadrdan, Saeed Peyghami, Hossein Mokhtari, Frede Blaabjerg
Summary: This letter presents a simple technique for monitoring the health status of the output capacitor of a boost converter. Unlike previous studies, which rely on measuring the equivalent series resistance or capacitance of an electrolytic capacitor, this letter proposes a new approach based on accurate measurement of the dissipation factor. Experimental tests confirm the effectiveness of the proposed method, with a maximum measurement error of 4%.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Sara Hasanpour, Yam P. Siwakoti, Frede Blaabjerg
Summary: This article proposes a new zero-voltage switching high step-up DC/DC converter with a built-in transformer for renewable energy applications. The proposed topology utilizes a three-winding built-in transformer to increase voltage gain while achieving high output voltages with a lower magnetic turns ratio. By using a regenerative active clamp circuit, the energy from the leakage inductor is absorbed and transferred to the output, achieving zero-voltage switching conditions for switches during turn-on time. The proposed circuit offers limited voltage stresses and eliminates reverse-recovery issues, making it suitable for renewable energy sources.
IEEE OPEN JOURNAL OF POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jianjun Chen, Weihao Hu, Guozhou Zhang, Jiaxiang Hu, Qi Huang, Zhe Chen, Frede Blaabjerg
Summary: Accurate and efficient bearing fault diagnosis method plays a crucial role in modern industrial system. However, the performance of fault diagnosis model varies with the sampling frequency of training data. In this article, a novel knowledge-sharing multi-task (KSMT) model is proposed to address this issue. The experimental results demonstrate that the proposed KSMT model outperforms other state-of-the-art methods and effectively overcomes the limitation of less information on fault diagnosis performance.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Electrical & Electronic
Lei Zhang, Jiangchao Qin, Youhui Qiu, Keyou Wang, Zirun Li, Yi Tang
Summary: The losses and volume of MMC-based SST under different operating conditions are comprehensively analyzed and evaluated using a developed computational model and methodology. The proposed analysis and methodology provide guidance and basis for the optimal design of MMC-SST in the future.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Yaqian Zhang, Yi Zhang, Jianzhong Zhang, Fujin Deng, Frede Blaabjerg
Summary: This article provides a detailed analysis of the hybrid modular multilevel converter (MMC) operating under the boost AC mode and proposes an improved capacitance design approach to reduce overall capacitance while maintaining performance. The proposed design allows for more cost-effective and space-efficient applications of hybrid MMC in distribution networks.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
