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Tiantian Zhang; Chengxiong Mao; Jiancheng Zhang; Jie Tian; Minghao Yu; Kuayu Wu; Hongtao Xiong; Long Wu; Hongfei Yu. Design and Field Application of Flexible Excitation System Damping Controllers. IEEE Transactions on Industrial Electronics 2020, 68, 949 -959.
AMA StyleTiantian Zhang, Chengxiong Mao, Jiancheng Zhang, Jie Tian, Minghao Yu, Kuayu Wu, Hongtao Xiong, Long Wu, Hongfei Yu. Design and Field Application of Flexible Excitation System Damping Controllers. IEEE Transactions on Industrial Electronics. 2020; 68 (2):949-959.
Chicago/Turabian StyleTiantian Zhang; Chengxiong Mao; Jiancheng Zhang; Jie Tian; Minghao Yu; Kuayu Wu; Hongtao Xiong; Long Wu; Hongfei Yu. 2020. "Design and Field Application of Flexible Excitation System Damping Controllers." IEEE Transactions on Industrial Electronics 68, no. 2: 949-959.
Digital-physical hybrid real-time simulation (hybrid simulation) platform integrates the advantages of both digital simulation and physical simulation by combining the physical simulation laboratory and the real-time digital simulator. Based on a 400 V/50 kVA hybrid simulation platform with 500 kVA short-circuit capacity, the hybrid simulation methodology and a Hausdorff distance based accuracy evaluation method are proposed. The case validation of power system fault recurrence is performed through this platform, and the stability and accuracy are further validated by comparing the hybrid simulation waveform and field-recorded waveform and by evaluating the accuracy with the proposed error index. Two typical application scenarios in power systems are studied subsequently. The static var generator testing shows the hybrid simulation platform can provide system-level testing conditions for power electronics equipment conveniently. The low-voltage ride through standard testing of a photovoltaic inverter indicates that the hybrid simulation platform can be also used for voltage standard testing for various power system apparatus with low cost. With this hybrid simulation platform, the power system simulation and equipment testing can be implemented with many advantages, such as short period of modelling, flexible modification of parameter and network, low cost, and low risk. Based on this powerful tool platform, there will be more application scenarios in future power systems.
Feng Leng; Chengxiong Mao; Dan Wang; Ranran An; Yuan Zhang; Yanjun Zhao; Linglong Cai; Jie Tian. Applications of Digital-Physical Hybrid Real-Time Simulation Platform in Power Systems. Energies 2018, 11, 2682 .
AMA StyleFeng Leng, Chengxiong Mao, Dan Wang, Ranran An, Yuan Zhang, Yanjun Zhao, Linglong Cai, Jie Tian. Applications of Digital-Physical Hybrid Real-Time Simulation Platform in Power Systems. Energies. 2018; 11 (10):2682.
Chicago/Turabian StyleFeng Leng; Chengxiong Mao; Dan Wang; Ranran An; Yuan Zhang; Yanjun Zhao; Linglong Cai; Jie Tian. 2018. "Applications of Digital-Physical Hybrid Real-Time Simulation Platform in Power Systems." Energies 11, no. 10: 2682.
Reliability is one of the major concerns when the electronic power transformer is employed in the field, and redundancy is a common approach to improve the reliability. For hot and cold redundancy schemes, the performance will be degraded due to the small number of power modules when the electronic power transformer is employed in the medium-voltage power grid. For the three-phase electronic power transformer, at least three redundant power modules are needed (one redundant power module per phase), which leads to a high redundancy cost. In this paper, a novel redundancy scheme is proposed. The proposed scheme can accomplish the faulty power module replacement process within tens of microseconds with nearly no transition. And only one power module and several switches are needed for three-phase redundancy, which can effectively save the redundancy cost. The proposed scheme is analyzed and supported by simulations and experimental results.
Jie Tian; Chengxiong Mao; Dan Wang; Shaoxiong Nie; Yun Yang. A Short-Time Transition and Cost Saving Redundancy Scheme for Medium-Voltage Three-Phase Cascaded H-Bridge Electronic Power Transformer. IEEE Transactions on Power Electronics 2018, 33, 9242 -9252.
AMA StyleJie Tian, Chengxiong Mao, Dan Wang, Shaoxiong Nie, Yun Yang. A Short-Time Transition and Cost Saving Redundancy Scheme for Medium-Voltage Three-Phase Cascaded H-Bridge Electronic Power Transformer. IEEE Transactions on Power Electronics. 2018; 33 (11):9242-9252.
Chicago/Turabian StyleJie Tian; Chengxiong Mao; Dan Wang; Shaoxiong Nie; Yun Yang. 2018. "A Short-Time Transition and Cost Saving Redundancy Scheme for Medium-Voltage Three-Phase Cascaded H-Bridge Electronic Power Transformer." IEEE Transactions on Power Electronics 33, no. 11: 9242-9252.
Electronic power transformers (EPTs) have been identified as emerging intelligent electronic devices in the future smart grid, e.g., the Energy Internet, especially in the application of renewable energy conversion and management. Considering that the EPT is directly connected to the medium-voltage grid, e.g., a10 kV distribution system, and its cascaded H-bridges structure, the common mode voltage (CMV) issue will be more complex and severe. The CMV will threaten the insulation of the entire EPT device and even produce common mode current. This paper investigates the generated mechanism and characteristics of the CMV in a cascaded H-bridge EPT (CHB-EPT) under both balanced and fault grid conditions. First, the CHB-EPT system is introduced. Then, a three-phase simplified circuit model of the high-voltage side of the EPT system is presented. Combined with a unipolar modulation strategy and carrier phase shifting technology by rigorous mathematical analysis and derivation, the EPT internal CMV and its characteristics are obtained. Moreover, the influence of the sinusoidal pulse width modulation dead time is considered and discussed based on analytical calculation. Finally, the simulation results are provided to verify the validity of the aforementioned model and the analysis results. The proposed theoretical analysis method is also suitable for other similar cascaded converters and can provide a useful theoretical guide for structural design and power density optimization.
Yun Yang; Chengxiong Mao; Dan Wang; Jie Tian; Ming Yang. Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer. Energies 2017, 10, 1357 .
AMA StyleYun Yang, Chengxiong Mao, Dan Wang, Jie Tian, Ming Yang. Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer. Energies. 2017; 10 (9):1357.
Chicago/Turabian StyleYun Yang; Chengxiong Mao; Dan Wang; Jie Tian; Ming Yang. 2017. "Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer." Energies 10, no. 9: 1357.