Article
Engineering, Electrical & Electronic
Liran Zheng, Xiangyu Han, Rajendra Prasad Kandula, Deepak Divan
Summary: This article proposes a fast predictive control method and a small dc-link inductor to minimize the dc-link current in a current-source converter based solid-state transformer. It not only improves the steady-state performance but also significantly enhances the dynamic performance, as experimentally validated.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Sebastian Raab, Andreas Kraemer, Ansgar Ackva
Summary: The article introduces a new method for calculating the RMS current load of DC-link capacitors specifically for direct current controllers, which is determined through an iterative calculation scheme. The method is validated through digital simulation models and test bench measurements, and compared with the calculation method for space vector modulation.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Multidisciplinary
Paolo Pescetto, Andres Sierra-Gonzalez, Fernando Alvarez-Gonzalez, Hansjorg Kapeller, Elena Trancho, Gianmario Pellegrino
Summary: Modern electric vehicles often use a DC/DC converter to increase the supply voltage and improve efficiency. This study proposes a novel control algorithm to adjust the DC-link voltage during vehicle operation, maximizing the efficiency of the converter and inverter without impacting motor control. The algorithm is independent of motor parameters and can be applied to various applications. Validation is done using a 135 kW 6-phase traction motor drive.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2023)
Article
Engineering, Multidisciplinary
Md Ehsanul Haque, Anik Chowdhury, Sifat Morshed Chowdhury, Salman Harasis, Shuvajit Das, Yilmaz Sozer, Omer Gundogmus, Lavanya Vadamodala, Fernando Venegas, David Colavincenzo, Jeffrey Geither
Summary: This article analyzes the DC-link current ripple in switched reluctance machine (SRM) drive and proposes a control algorithm to reduce the ripple while maintaining machine performance. The proposed algorithm extracts ripple components from the DC-link current using a high-pass filter and ensures ripple energy circulation between phases, reducing the pulsating energy requirement from the DC supply. The DC-link ripple is suppressed at a wide speed range of operation to enable efficient and reliable drive operation without adding any external hardware system.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2021)
Article
Automation & Control Systems
Hao Ding, Quanjie Li, Xiaoqiang Guo, Yong Yang, Zhigang Lu
Summary: DC-link current ripple is an important performance indicator of a current-source converter and is closely related to the modulation strategy. Excessive ripple reduces system efficiency, increases total harmonic distortion of grid current, and causes electromagnetic interference. In this article, a novel modulation strategy is proposed to reduce ripple by optimizing the switching sequence according to the modulation index. The proposed strategy effectively reduces current ripple across the modulation index range without increasing switching frequency or inductor, and experimental results confirm its validity.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Guidong Zhang, Ziyang Wu, Shenglong S. Yu, Hieu Trinh, Yun Zhang
Summary: This article develops a series of improved Z-source dc-dc converters that achieve additional voltage pumping and high power density through two propositions. Proposition 1 introduces two improved positive- and negative-connected Z-source dc-dc converters, and Proposition 2 proposes four novel embedded Z-source dc-dc converters. The performance of the proposed converters is thoroughly compared and validated through experiments.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Ali Nikbahar, Mohammad Monfared
Summary: This article introduces two new Y-source inverters with clamped dc-link voltage, which have high boost capability and design flexibility, can reduce the amplitude of shoot-through current, and improve power density and efficiency.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Gaolin Wang, Feifan Chen, Nannan Zhao, Yin Bai, Binxing Li, Shaobo Liu, Dianguo Xu
Summary: An traceback-prediction current correction method is proposed in this article to improve current reconstruction precision by introducing the concept of equivalent current change rate and establishing a phase current characteristic model based on state observer. The effectiveness of the proposed method is verified by experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Tien-The Nguyen, Honnyong Cha, Heung-Geun Kim
Summary: This article introduces a current-fed full-bridge isolated dc-dc converter using quasi-Z-source network, which effectively eliminates voltage overshoot problems and reduces switch current stress compared to conventional converters with active clamp. The operation principles are analyzed in detail and simulation/experimental results with a 1-kW prototype are provided to verify theoretical analysis.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Nannan Zhao, Runfeng Gao, Gaolin Wang, Dawei Ding, Guoqiang Zhang, Dian Guo Xu
Summary: An online dc-link capacitance estimation method is investigated for reduced capacitance IPMSM drives, which does not require additional signal injection or sensors. The power coupling characteristics are analyzed to obtain the instantaneous power of the dc-link capacitor, and a bandpass filter is applied to extract the necessary voltage and power components for estimation. The proposed method is experimentally proven to have an estimation error within 1%.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Louelson Afranio Leugirdes de Azevedo Cavalcanti Costa, Montie Alves Vitorino, Mauricio Beltrao de Rossiter Correa, Lucas Vinicius Hartmann, Andre Wild Silva Ramalho
Summary: This article presents a novel topology generalization of a current source converter (CSC) that allows controlling multiple single-phase ac converters independently while sharing the same dc-bus, resulting in a reduced number of conducting switches and lower dc-bus current. The new topology ensures generating any number of ac output currents with only (n + 1) conducting switches in a switching period, leading to a 50% reduction in conduction losses compared to conventional multiport single-phase CSCs. Additionally, a scalar pulsewidth modulation for control with switching optimization and its generalization are discussed, along with details of the topology, control strategy, and modulation. Simulation and experimental results validate the theoretical approach.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Jingjing Huang, Xiaoyu Wang, Geng Li, Yuangang Sun, Aimin Zhang, Jinyu Wang
Summary: The importance of suppressing dc voltage ripple in resonant dc/dc converters to improve efficiency and ensure power quality is discussed in this paper. An analytical methodology based on instantaneous power theory is proposed to establish a model suitable for any cases and it is found that the voltage ripple largely depends on the switching frequency. A multisteps frequency range design approach is presented to ensure allowable voltage ripple in the entire power range.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Abdalla Hussein Mohamed, Hendrik Vansompel, Peter Sergeant
Summary: This article proposes a dc-link structure that can be integrated with circumscribing polygon modular integrated drives. A generic design methodology is provided for this structure, which combines dc-link capacitors and bus-bar without increasing the diameter of the integrated structure. The influences of the bus-bar parasitics on dc-link waveforms are evaluated using electromagnetic finite element method (FEM) models, and electromagnetic and computational fluid dynamics (CFD) models are developed to ensure reliable operation in high ambient temperatures.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Automation & Control Systems
Franco Degioanni, Ignacio Galiano Zurbriggen, Martin Ordonez
Summary: This paper presents a state-plane model and control strategy to improve the dynamic characteristics of the DC-link for three-phase converters. By representing the natural dynamic behavior in circular trajectories in the state-plane and selecting appropriate paths to solve transients, fast and consistent DC-link voltage responses are achieved.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Junxiao Wang, Hai Yang, Yibin Liu, Jose Rodriguez
Summary: This article proposes a low-cost multistep finite control set model predictive current control method for permanent magnet synchronous motors (PMSM) using a single dc link current sensor. The article addresses the problems with current reconstruction technology in finite control set model predictive control, and introduces a multiperiod sampling method and a variable period compensation method to improve current reconstruction accuracy. Additionally, a low-cost multistep FCS-MPCC strategy based on the reconstructed three-phase current is proposed to enhance system performance and reliability. Simulation and experimental results confirm the effectiveness of the method.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Editorial Material
Engineering, Electrical & Electronic
Yaow-Ming Chen, Yunwei Li
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ling Xing, Qiang Wei, Yunwei Li
Summary: The current power converters used in high-power medium-voltage PV systems require the use of a bulky and costly line-frequency transformer. To address this issue, cascaded H-bridge converter and modular multilevel converter based converters have been proposed. However, they face technical challenges, such as power imbalance, which require additional efforts for modifications and controls. In this work, a new power converter is proposed that eliminates the need for a line-frequency transformer and overcomes these challenges. It features reliable short-circuit protection, high scalability, and well-proven converters. The operation principle and control scheme are introduced and performance is verified through simulations and lab-scaled experiments.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Di Mou, Liqiang Yuan, Jia Li, Nie Hou, Jianchao Li, Yunwei Li, Zhengming Zhao
Summary: This article proposes a novel four-degree-of-freedom (4-DOFs) modulation scheme for the hybrid dual active bridge (HDAB) converter, which improves efficiency by utilizing the respective structural characteristics of the half bridge and full bridge. The steady-state model of the HDAB converter with the 4-DOF modulation scheme is established, and the optimal O4-DOF modulation scheme is obtained using the particle swarm optimization (PSO) algorithm. Compared to the conventional phase shift modulation (PSM) scheme, the proposed O4-DOFs modulation scheme significantly improves converter efficiency. The theoretical analysis is verified through an experimental platform with specific input and output parameters.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Pasan Gunawardena, Dulika Nayanasiri, Nie Hou, Yunwei Li
Summary: A soft-switched current-fed dual-input isolated dc-dc converter topology is proposed in this article, which integrates two low-voltage dc sources with similar transferred characteristics into a dc bus. The energy transfer between the input and output ports is controlled by modulating the pulse-width of the control signals. The smooth connection between the input-side inductor and the transformer leakage inductance is achieved.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Xuesong Wu, Cheng Xue, Li Ding, Zhongyi Quan, Yunwei Li
Summary: The article proposes an improved finite control set model predictive control method to address the issues of phase circulating current and zero-sequence circulating current in parallel-operated voltage source converters. The method analyzes two parallel-operated two-level converters as a single three-level converter and introduces a two-stage voltage vector preselection strategy to reduce the computational burden. Experimental results demonstrate that the proposed method achieves superior load current performance and effectively suppresses circulating current.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Jianwen Zhang, Yuwen Liu, Jiajie Zang, Jiacheng Wang, Jianqiao Zhou, Gang Shi, Xu Cai, Yunwei Li
Summary: Meshed dc or hybrid ac/dc distribution grids have attracted increasing interest lately and their power flow control is a major topic of study. This study proposes a new dc power flow controller (DCPFC) directly integrated in a modular multilevel dc transformer, which can effectively mitigate power flow congestion and line losses by optimizing the power flow of the connected feeders. The proposed DCPFC features a simple structure, convenience for multiport extension, and bidirectional power flow adjustment capability, without the need for an external power supply and high-voltage isolation transformer.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Yue Zhang, Li Ding, Nie Hou, Yunwei Li
Summary: This article proposes a dual-inductor-connected isolated DC-DC converter, which achieves low high-frequency current harmonics and convenient direct current control (DCC) capability through the connected inductors. It also realizes voltage spike suppression and soft-switching operation without snubber circuits, making it suitable for high voltage-gain applications.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ruizhi Wei, Li Ding, Rui Liu, Yunwei Li
Summary: This article focuses on the SOM model and resonant parameter design for the CLLC charger. The proposed SOM model provides a more accurate and intuitive depiction of the voltage gain compared to the conventional model. It also simplifies the computational complexity of the time-domain model. A step-by-step parameter design methodology is studied, streamlining the design process and considering various factors such as efficiency, soft-switching operation, mode boundaries, and system stability. Simulations and experiments validate the accuracy of the SOM model and the straightforwardness of the design methodology, achieving a 97% peak efficiency in a 1 kW CLLC charger prototype.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Editorial Material
Engineering, Electrical & Electronic
Yunwei Ryan Li, Vivek Agarwal, Xiongfei Wang
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Nie Hou, Li Ding, Pasan Gunawardena, TianHong Wang, Yue Zhang, Yun Wei Li
Summary: In the past ten years, extensive research has been conducted on partial power processing (PPP) converter systems to embed renewable energy sources (RESs) into strong grid systems, resulting in less power transferred loss. A novel PPP structure is proposed in this article to integrate RESs and energy storage systems (ESSs) in an islanded dc microgrid with robust dc-link voltage. A high-robustness control scheme is proposed to maintain the total dc-link voltage when the working condition of the RES, the output voltage of the ESS, and the power requirement of the consumer change. Simulation and experiment results using PV panel as an example demonstrate the effectiveness of the proposed PPP structure and methods.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Yaofei Han, Shaofeng Chen, Chao Gong, Xing Zhao, Fanggang Zhang, Yunwei Li
Summary: This paper proposes a novel sliding mode disturbance observer-based technique to diagnose demagnetization fault of interior permanent magnet motors with stator parameter mismatch impacts eliminated. Firstly, the IPM motor model considering disturbances caused by PM demagnetization and stator parameter mismatch is established. Then, an SM disturbance observer is constructed to identify the overall disturbance caused by all parameters, with stability discussed using the Lyapunov function. Finally, a current-analysis-based method is developed to extract the disturbance caused by flux linkage mismatch and calculate the real flux linkage for demagnetization fault judgment and degree calculation.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Nie Hou, Jingxin Hu, Di Mou, Yue Zhang, Yun Wei Li, Rik W. De Doncker
Summary: Based on phase-shift modulation, the DAB dc-dc converter exhibits self-volt-second balance and may experience a dc offset in series-inductance current when changing the phase-shift ratio suddenly. This can lead to magnetic saturation in the transformer and potential failure of the converter system. To address this issue, a simple dc-offset eliminating method independent of the phase-shift modulation method is proposed. Experimental results demonstrate the effectiveness of the proposed method for the DAB dc-dc converter.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Jianwen Zhang, Xin Feng, Jianqiao Zhou, Jiajie Zang, Jiacheng Wang, Gang Shi, Xu Cai, Yunwei Li
Summary: Soft normally open point (SNOP) is an emerging solution for distributed networks (DNs) to address voltage violation and feeder congestion caused by the increasing integration of distributed energy resources and new types of loads. Based on the cascaded H-bridge structure and series-shunt arrangement, the proposed series-shunt multiport SNOP (S-2-MSNOP) can easily extend its ports by increasing the number of submodules with small power ratings, reducing the device cost and volume. Verifications on both simulation and experimental platforms prove the feasibility and effectiveness of the S-2-MSNOP.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Ling Xing, Qiang Wei, Yunwei Li
Summary: This article proposes a modified version of a transformerless series-connected current-source converter with fewer switch counts. It presents the operation principle, a new modulation scheme, and discusses technical challenges and potential applications. The performance is verified through simulations and lab-scaled experiments.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Yuanhong Tang, Weihao Hu, Di Cao, Nie Hou, Zhuoqiang Li, Yun Wei Li, Zhe Chen, Frede Blaabjerg
Summary: This article proposes an improvement approach for the dual-active-bridge converter using a variable-frequency triple-phase-shift control strategy with the help of deep reinforcement learning. The twin delayed deep deterministic policy gradient algorithm is adopted to train the agent offline, aiming to minimize power losses under varying switching frequencies. The training of the algorithm incorporates zero-voltage switching performance. Based on this, the trained agent acts as a fast surrogate predictor, generating appropriate control strategies in real-time for continuous operation with soft switching and maximum conversion efficiency. The effectiveness and correctness of the proposed scheme are validated through experimental results in a laboratory prototype.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
