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Yuanbin He
Hangzhou Dianzi University, Hangzhou, China

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Journal article
Published: 20 August 2021 in IEEE Access
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To improve both the stability and the disturbance suppression ability of single-phase grid-connected inverters through LCL filters, this paper proposes an inverter output impedance enhancing control mechanism. The impedance enhancing control mechanism employs a virtual impedance control and a node-voltage feedforward control to ensure sufficient passivity and high amplitude of inverter output impedance over wide frequency range of interest. The proposed control mechanism is realized through combination control of a low-voltage bidirectional voltage-source-converter (B-VSC) connected at the filter capacitor branch and the main inverter. The B-VSC sustains an extra low power without sacrificing the efficiency of the inverter. Both the simulation and experimental results are finally given to verify the validity of the proposed method, which shows the performance improvement of the proposed radial-line inverter system working under variable grid conditions.

ACS Style

Zhiwei Bian; Yuqi Peng; Yuanbin He; Lijun Hang; Xiaogao Xie; Henry Shu-Hung Chung. Grid-Connected Inverter Output Impedance Reshaping for Passivity Enhancement and Disturbance Rejection. IEEE Access 2021, 9, 1 -1.

AMA Style

Zhiwei Bian, Yuqi Peng, Yuanbin He, Lijun Hang, Xiaogao Xie, Henry Shu-Hung Chung. Grid-Connected Inverter Output Impedance Reshaping for Passivity Enhancement and Disturbance Rejection. IEEE Access. 2021; 9 ():1-1.

Chicago/Turabian Style

Zhiwei Bian; Yuqi Peng; Yuanbin He; Lijun Hang; Xiaogao Xie; Henry Shu-Hung Chung. 2021. "Grid-Connected Inverter Output Impedance Reshaping for Passivity Enhancement and Disturbance Rejection." IEEE Access 9, no. : 1-1.

Journal article
Published: 20 April 2020 in IEEE Transactions on Power Electronics
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In this paper, the primary-side regulation (PSR) technique to achieve accurate output current in LLC resonant converter has been studied. A novel PSR control scheme for LLC LED driver based on “magnetizing current cancellation method” is proposed. The proposed “magnetizing current cancellation method” can effectively eliminate the effect of magnetizing current in the sampled primary resonant current under both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Thus, the accurate output current can be estimated on the primary side of LLC resonant converter. The magnetizing current cancellation method for the LLC LED driver with symmetric primary resonant current and asymmetric primary resonant current has been analyzed in detail. Some design considerations have also been presented. After that, a LLC PSR control circuit has been designed out based on the theoretic analysis. Finally, a 48V-78V/1.3A laboratory prototype for LED driver has been built up and experimental results show that good output current regulation has been obtained.

ACS Style

Hanjing Dong; Xiaogao Xie; Fengjiang Mao; Lina Zhang; Yuanbin He. A Novel Primary-Side Regulation Control Scheme for CCM and DCM LLC LED Driver Based on “Magnetizing Current Cancellation Method”. IEEE Transactions on Power Electronics 2020, 35, 12223 -12237.

AMA Style

Hanjing Dong, Xiaogao Xie, Fengjiang Mao, Lina Zhang, Yuanbin He. A Novel Primary-Side Regulation Control Scheme for CCM and DCM LLC LED Driver Based on “Magnetizing Current Cancellation Method”. IEEE Transactions on Power Electronics. 2020; 35 (11):12223-12237.

Chicago/Turabian Style

Hanjing Dong; Xiaogao Xie; Fengjiang Mao; Lina Zhang; Yuanbin He. 2020. "A Novel Primary-Side Regulation Control Scheme for CCM and DCM LLC LED Driver Based on “Magnetizing Current Cancellation Method”." IEEE Transactions on Power Electronics 35, no. 11: 12223-12237.

Journal article
Published: 06 March 2020 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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Boundary control with second-order switching surface is exploited for achieving faster response time and robust operation of switching power converters. However, the system performance of the boundary-controlled converters is significantly affected when it is connected to a second-stage converter with a large input capacitor. This paper studies the shortcomings in second-order boundary control schemes of buck converter with capacitive loads and non-linear switching loads. Secondly, the paper proposes a boundary control scheme with corrected second-order switching surface to drive buck converters cascaded to boost converters. The switching criteria of the corrected control law account for the effect of unknown load capacitance as well as the variation in filter parameters. Therefore, outer voltage ripple feedback loop is introduced to determine corresponding the switching criteria gain factor that adjusts the overall gain, while maintaining the output voltage ripple at a specified voltage band. The proposed method is verified by both simulation and hardware experiments. A 250 W buck converter prototype has been built to validate the control scheme under different load types including resistive-capacitive load, a boost converter and a commercial dc electronic load. A comparison is drawn between conventional boundary control and the proposed method in both simulation and experimental environment in order to highlight the advantages of the proposed method. With this approach, the converter operates at designed boundary control parameters independent of load capacitance and system parameter variations.

ACS Style

Isuru D.G. Jayawardana; Carl Ngai Man Ho; Yuanbin He. Boundary Control With Corrected Second-Order Switching Surface for Buck Converters Connected to Capacitive Loads. IEEE Journal of Emerging and Selected Topics in Power Electronics 2020, 9, 183 -196.

AMA Style

Isuru D.G. Jayawardana, Carl Ngai Man Ho, Yuanbin He. Boundary Control With Corrected Second-Order Switching Surface for Buck Converters Connected to Capacitive Loads. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2020; 9 (1):183-196.

Chicago/Turabian Style

Isuru D.G. Jayawardana; Carl Ngai Man Ho; Yuanbin He. 2020. "Boundary Control With Corrected Second-Order Switching Surface for Buck Converters Connected to Capacitive Loads." IEEE Journal of Emerging and Selected Topics in Power Electronics 9, no. 1: 183-196.

Journal article
Published: 20 December 2019 in IEEE Access
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Nonlinear boundary control technique can offer superior dynamic behavior and eliminate the LCL-filter resonance in the grid-connected inverter. However, the chattering might be aroused by the distorted intracycle voltage information in the control law. It becomes worse when the nonlinear boundary controller is directly applied in three-phase three-wire inverter configuration. A hybrid current control scheme utilizing the decoupled predictive hysteresis capacitor current controller integrated with the linear grid current controller is proposed in the paper. By applying the 60° discontinuous pulse-width modulation scheme and using the virtual dual-buck decoupled structure, two separate sets of switching criteria for dictating the switching states of two specific half-bridge legs are formulated to avoid the interactions amongst phases. A small-signal ac model is also built to study the transfer characteristics of such hybrid current controlled inverter system. Simulation and experimental results have been offered to evaluate the effectiveness of the proposed method. Both results meet the theoretical predictions.

ACS Style

Yuanbin He; Bangchao Wang; Xiaogao Xie; Lei Shen; Pingliang Zeng. A Decoupled Hybrid Current Control for Improving the Performance of 60° DPWM-Based Three-Phase Grid-Connected Inverter. IEEE Access 2019, 8, 876 -888.

AMA Style

Yuanbin He, Bangchao Wang, Xiaogao Xie, Lei Shen, Pingliang Zeng. A Decoupled Hybrid Current Control for Improving the Performance of 60° DPWM-Based Three-Phase Grid-Connected Inverter. IEEE Access. 2019; 8 (99):876-888.

Chicago/Turabian Style

Yuanbin He; Bangchao Wang; Xiaogao Xie; Lei Shen; Pingliang Zeng. 2019. "A Decoupled Hybrid Current Control for Improving the Performance of 60° DPWM-Based Three-Phase Grid-Connected Inverter." IEEE Access 8, no. 99: 876-888.

Journal article
Published: 31 October 2019 in Applied Sciences
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Distributed power inverters with inductive capacitive–inductive (LCL) filters have become popular in distributed power generation system. However, due to unknown grid impedance, the inverters are confronted with challenges of local filter resonance, poor power quality, and multiple interactive resonance. This paper proposes a low-loss active compensator that can counteract effects of the grid impedance on the current control performance of single-phase grid-connected inverter with an LCL filter. The compensator utilizes dual unit point-of-common-coupling voltage feedforward control mechanisms (VFFC), in which one is integrated with the inverter controller, and the other is generated through an extra low voltage source converter (LV-VSC) in series with the filter capacitor. The LV-VSC has no additional passive inductive-capacitive filtering elements and provides very low volt-ampere. To confirm its validity, a single-phase inverter testbed integrated with the compensator was built. The experimental results validate the current-controlled performance enhancement of the proposed inverter system operating under different grid conditions.

ACS Style

Yuqi Peng; Yuanbin He; Lijun Hang. Low-Loss Active Grid Impedance Cancellation in Grid-Connected Inverters with LCL Filter. Applied Sciences 2019, 9, 4636 .

AMA Style

Yuqi Peng, Yuanbin He, Lijun Hang. Low-Loss Active Grid Impedance Cancellation in Grid-Connected Inverters with LCL Filter. Applied Sciences. 2019; 9 (21):4636.

Chicago/Turabian Style

Yuqi Peng; Yuanbin He; Lijun Hang. 2019. "Low-Loss Active Grid Impedance Cancellation in Grid-Connected Inverters with LCL Filter." Applied Sciences 9, no. 21: 4636.

Journal article
Published: 01 July 2019 in The Journal of Engineering
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To ease the heavy burden of inverter control, including line current regulation, harmonic current suppression, filter resonance suppression, grid distortion suppression, phase locked loop etc., the study proposes a master–slave current regulation method for an LCL-filter-based grid-connected inverter operating under variable grid condition. The proposed system is composed of a grid-connected voltage-source inverter (GC-VSI) in series with a bidirectional voltage-source converter (B-VSC) at the inverter output. The GC-VSI is responsible for line current regulation, while the B-VSC takes charge of harmonic current suppression and grid impedance cancellation. Owing to low volt-ampere of the B-VSC, the efficiency of the inverter system is not sacrificed. To confirm its validity, a simulation platform with the proposed inverter system has been built. The simulation results demonstrate the performance enhancement of the proposed inverter system operating under different grid conditions.

ACS Style

Yuanbin He; Yuqi Peng; Bangchao Wang; Lijun Hang. Master–slave current regulation of an LCL‐filter‐based grid‐connected inverter under variable grid condition. The Journal of Engineering 2019, 2019, 4896 -4899.

AMA Style

Yuanbin He, Yuqi Peng, Bangchao Wang, Lijun Hang. Master–slave current regulation of an LCL‐filter‐based grid‐connected inverter under variable grid condition. The Journal of Engineering. 2019; 2019 (18):4896-4899.

Chicago/Turabian Style

Yuanbin He; Yuqi Peng; Bangchao Wang; Lijun Hang. 2019. "Master–slave current regulation of an LCL‐filter‐based grid‐connected inverter under variable grid condition." The Journal of Engineering 2019, no. 18: 4896-4899.

Journal article
Published: 17 March 2019 in Applied Sciences
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In general, the integral sliding mode control (ISMC) with an integral sliding surface would lead to tracking errors under unbalanced and harmonic grid voltage conditions. In order to eliminate tracking errors under these conditions, multi-resonant items are added to the conventional integral sliding surface in the proposed strategy, which can be called multi-resonant-based sliding mode control (MRSMC). A comparison of tracking precision on the ISMC and MRSMC is analyzed. In order to regulate the system powers directly, the errors of instantaneous active and reactive powers are selected as the state variables. Finally, the output current harmonics and a majority of the doubly-fed induction generator’s (DFIG) electromagnetic torque pulsations can be removed under unbalanced and harmonic grid voltage conditions. Simulation and experimental results are presented to verify the correctness and effectiveness of the proposed strategy.

ACS Style

Yu Quan; Lijun Hang; Yuanbin He; Yao Zhang. Multi-Resonant-Based Sliding Mode Control of DFIG-Based Wind System under Unbalanced and Harmonic Network Conditions. Applied Sciences 2019, 9, 1124 .

AMA Style

Yu Quan, Lijun Hang, Yuanbin He, Yao Zhang. Multi-Resonant-Based Sliding Mode Control of DFIG-Based Wind System under Unbalanced and Harmonic Network Conditions. Applied Sciences. 2019; 9 (6):1124.

Chicago/Turabian Style

Yu Quan; Lijun Hang; Yuanbin He; Yao Zhang. 2019. "Multi-Resonant-Based Sliding Mode Control of DFIG-Based Wind System under Unbalanced and Harmonic Network Conditions." Applied Sciences 9, no. 6: 1124.

Journal article
Published: 13 July 2018 in IEEE Transactions on Power Electronics
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The paper presents a new digital control scheme for Active Virtual Ground-Bridgeless PFC (AVG-BPFC) which is able to obtain an optimized solution between the system efficiency and Electromagnetic Interference (EMI) performance in the PFC stage. However, a resonant characteristic is generating from the input LCL filter structure of the converter. In addition, there is a phase difference between two inductor currents which also leads the controller design in the AVG-BPFC to become challenging, especially on the system stability and the current quality. Thus, a triple loop control's architecture together with an integrated state machine is proposed as the control methodology of the AVG-BPFC. Under the simple control structure in the digital platform, a stable system is achieved together with a precise grid current tracking function. Such control scheme was implemented digitally on a 1.5 kW prototype. In the paper, theoretical models of the whole system were analysed and the system performance was successfully verified in both steady state and transient state conditions. The experimental results showed a good agreement with the theoretical knowledge.

ACS Style

Ken King-Man Siu; Yuanbin He; Carl Ngai Man Ho; Henry Shu-Hung Chung; River Tin-Ho Li. Advanced Digital Controller for Improving Input Current Quality of Integrated Active Virtual Ground-Bridgeless PFC. IEEE Transactions on Power Electronics 2018, 34, 3921 -3936.

AMA Style

Ken King-Man Siu, Yuanbin He, Carl Ngai Man Ho, Henry Shu-Hung Chung, River Tin-Ho Li. Advanced Digital Controller for Improving Input Current Quality of Integrated Active Virtual Ground-Bridgeless PFC. IEEE Transactions on Power Electronics. 2018; 34 (4):3921-3936.

Chicago/Turabian Style

Ken King-Man Siu; Yuanbin He; Carl Ngai Man Ho; Henry Shu-Hung Chung; River Tin-Ho Li. 2018. "Advanced Digital Controller for Improving Input Current Quality of Integrated Active Virtual Ground-Bridgeless PFC." IEEE Transactions on Power Electronics 34, no. 4: 3921-3936.

Journal article
Published: 15 January 2018 in IEEE Transactions on Power Electronics
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An active grid impedance cancellator using the concept of series active filter to suppress the effect of the grid disturbance and stabilize the single-phase grid-connected inverters with an LCL filter operating under variable grid conditions is presented. Harmonic interaction between the inverter and the grid is thereby avoided owing to the cancellation of equivalent grid impedance. More importantly, the impedance cancellator offers an active damping function to ease the heavy burden of the inverter control, such as power control, phase locked loop, current regulation, impedance shaping, etc. The impedance cancellator is a full-bridge dc-ac converter having no passive inductive-capacitive (LC) filter. It is connected in series with the inverter output and is operated as a negative virtual grid impedance. As the VA rating of the impedance cancellator is low, the efficiency of the entire system is not sacrificed. Starting with the impedance-based analytical modeling method, the basic principle of equivalent grid impedance cancellator is derived and studied. Then, the digital control strategy and the modeling of equivalent grid impedance cancellator are examined. The experimental results of a prototype cancellator for a single-phase inverter is favorably compared with theoretical predictions.

ACS Style

Yuanbin He; Henry Shu-Hung Chung; Jacky Chun Tak Lai; Xin Zhang; Weimin Wu. Active Cancelation of Equivalent Grid Impedance for Improving Stability and Injected Power Quality of Grid-Connected Inverter Under Variable Grid Condition. IEEE Transactions on Power Electronics 2018, 33, 9387 -9398.

AMA Style

Yuanbin He, Henry Shu-Hung Chung, Jacky Chun Tak Lai, Xin Zhang, Weimin Wu. Active Cancelation of Equivalent Grid Impedance for Improving Stability and Injected Power Quality of Grid-Connected Inverter Under Variable Grid Condition. IEEE Transactions on Power Electronics. 2018; 33 (11):9387-9398.

Chicago/Turabian Style

Yuanbin He; Henry Shu-Hung Chung; Jacky Chun Tak Lai; Xin Zhang; Weimin Wu. 2018. "Active Cancelation of Equivalent Grid Impedance for Improving Stability and Injected Power Quality of Grid-Connected Inverter Under Variable Grid Condition." IEEE Transactions on Power Electronics 33, no. 11: 9387-9398.