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Model Predictive Direct Power Control of Grid-connected Converters Considering Unbalanced Filter Inductance and Grid Conditions

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1279-1288页

作者： Weichen Yang Shihong Miao Zhiwei Liu Ji Han Yulong Xiong Qingyu Tu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key LaboratorySchool of Electrical and Electronic EngineeringHuazhong University of Science and Technology

The grid-connected converter(GCC) is widely used as the interface between various distributed generations and the utility grid. To achieve precise power control for GCC, this paper presents a model predictive direct power control(MPDPC)with consideration of the unbalanced filter inductance and grid conditions. First, the characteristics of GCC with unbalanced filter inductance are analyzed and a modified voltage control function is derived. On this basis, to compensate for the power oscillation caused by unbalanced filter inductance, a novel power compensation method is proposed for MPDPC to eliminate the DC-side current ripple while maintaining sinusoidal grid current. Besides, to improve the control robustness against mismatched filter inductance, a filter inductance identification scheme is proposed. Through this scheme, the estimated value of filter inductance is updated in each control period and applied in the proposed MPDPC. Finally, simulation results in PSCAD/EMTDC confirm the validity of the proposed MPDPC and the filter inductance identification scheme.

关键词： Inductance identification grid-connected converter model predictive control power oscillation elimination unbalanced grid conditions

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Comparative Study of Four-Phase Flux Modulated Doubly-Salient Reluctance Motors With Different Winding Polarity Configurations 5

Comparative Study of Four-Phase Flux Modulated Doubly-Salien...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Yu, Zhiyue Gan, Chun Ni, Kai Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

To reduce the torque ripple and radial vibration, the flux modulated doubly-salient reluctance motor (FMDRM) drives are investigated, where the conventional quasi square current excitation scheme is replaced by the novel dc-biased sinusoidal current excitation scheme with the guidance of the flux modulation principle. However, the existing investigations mainly focus on the three-phase FMDRM. To evaluate the performance of the four-phase FMDRM, this paper proposes a comparative study of the four-phase FMDRMs with different winding polarity configurations. The electromagnetic characteristics of the four-phase 8/6 FMDRMs with commonly utilized 4N4S and NSNS winding polarity configurations are investigated in detail. The magnetomotive force (MMF), winding inductance, phase back electromotive force (back-EMF), torque output capability, and torque ripple are analyzed and compared. In addition, the corresponding finite element analysis (FEA) results are carried out for motor performance comparison. The results show that, compared to the NSNS winding polarity, the 4N4S polarity can achieve a better overall torque performance in the steady-state. However, the NSNS polarity can achieve better overload capacity. © 2022 IEEE.

关键词： Reluctance motors

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An Improved Calculation Method for AC Losses of 30 MJ/5 MW SMES

An Improved Calculation Method for AC Losses of 30 MJ/5 MW S...

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2023 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2023

作者： Qiu, Yifeng Ren, Li Xu, Ying Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350301571

The toroidal D-shaped high-temperature super-conducting (HTS) magnet structure offers several advantages, such as low leakage magnetic field and vertical magnetic field on the tapes, and excellent mechanical properties characterized by pure tensile electromagnetic stress. As a result, it finds wide application in large-scale magnetic, including superconducting magnetic energy storage (SMES) and magnetic confinement fusion (MCF) devices. However, the highly asymmetric three-dimensional structure impose challenges in numerical modeling and electromagnetic computations, leading to difficulties in modeling, low computational efficiency, and even computational infeasibility. The "dimension reduction inversion"method is an innovative approach for electromagnetic calculations in toroidal magnets. this paper improved upon this method and applied it to the toroidal D-shaped structure, specifically calculating the electromagnetic field and AC loss of 30MJ/5MW liquid hydrogen superconducting composite energy storage (LIQHYSMES) magnet. This research provides a feasible approach for electromagnetic computations in large-scale toroidal D-shaped HTS magnets. © 2023 IEEE.

关键词： AC loss electromagnetic calculation HTS magnets toroidal D-shaped magnets

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A Control Strategy without Position Sensor in PMSM Electric Vehicle Drive

A Control Strategy without Position Sensor in PMSM Electric ...

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2023 IEEE International Conference on Predictive Control of Electrical Drives and Power Electronics, PRECEDE 2023

作者： Long, Zeyang Li, Zixin Wang, Shuanghong Huazhong University of Science and Technology School of Electric and Electronic Engineering Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350396867

Permanent-Magnet Synchronous Motor (PMSM) is widely used in the electric vehicle (EV) industry. Due to the instability and the cost of the position sensor, massive studies have been done to achieve the control without position sensor on PMSM. This paper analyzes the switching process from I/F strategy to Sliding Mode Observer (SMO) strategy in details, and also introduces the framework of I/F strategy with model predictive controller (MPC) as well as SMO used in the model. Furthermore, a new optimization algorithm called Angle Weighting Switching Strategy (AWSS) is proposed to smooth the transition process so as to mitigate the current-jitter and reduce speed fluctuation. Moreover, simulation between conventional switching method and the proposed method has been done to validate the effectiveness and robustness of the proposed control algorithm. © 2023 IEEE.

关键词： Permanent magnets

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Online Junction Temperature Monitoring for Discrete SiC MOSFET Based on On-state Voltage at High Temperature

Online Junction Temperature Monitoring for Discrete SiC MOSF...

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2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2022

作者： Hu, Haoran Wang, Zhiqiang Zhou, Yimin Zhou, Da Xin, Guoqing Shi, Xiaojie Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665492065

ISBN: (纸本)9781665492065

Junction temperature monitoring is crucial for condition monitoring and thermal management of power semiconductor devices. In this paper, the online monitoring of junction temperature for discrete SiC MOSFETs is achieved by simultaneous measurements of their on-state voltage and current. A dedicated calibration circuit that decouples switching and conduction losses is used to obtain a look-up table for the junction temperature. According to the test results, under the operating condition with current of 50 A and temperature of 175°C, a single pulse test of 10 μ can cause a temperature rise of 8-9 °C, due to the self-heating effect of the discrete SiC MOSFETs. This temperature rise of DUT during the calibration test is compensated by the Foster network thermal model of the device afterwards. © 2022 IEEE.

关键词： Junction temperature

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Directional Pilot Protection Method of Energy Ratio of Whole Frequency Band for VSC-HVDC grid based on improved HHT 11

Directional Pilot Protection Method of Energy Ratio of Whole...

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11th Annual Meeting of CSEE Study Committee of HVDC and Power Electronics, HVDC 2022

作者： Chen, Tiantian Zhao, Zhenting Li, Yinhong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839538568

A directional pilot protection method of energy ratio of whole frequency band based on improved HHT is proposed to solve the problems of flexible DC line backup protection which is easily affected by the distributed capacitance of transmission line, synchronous communication, high resistance and applicability of algorithm. Firstly, by analysing the amplitude frequency response characteristics of the line boundary under forward and reverse faults, the attenuation effect of the boundary on the energy of different frequency band is obtained;Then, the improved HHT algorithm based on EEMD is used to extract the voltage energy of each frequency band, and constructs the fault detection criterion, direction criterion and pole selection criterion;Finally, based on PSCAD/EMTDC simulation platform, the effectiveness of the protection scheme is verified. © 2222 IET Conference Proceedings

关键词： Frequency response

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A High-Efficiency Bidirectional LLC Resonant Converter Based on Current-Doubler Rectification Circuit 5

A High-Efficiency Bidirectional LLC Resonant Converter Based...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Dong, Mingyang Chen, Changsong Xu, Zhiwen Chen, Haowen Han, Dongtong Zhang, Jingyre Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

With the development of microgrids, DC/DC converters for bidirectional energy transmission between DC bus and energy storage batteries have received more and more attention. In order to convert the high voltage of the DC bus and the low voltage of the batteries, the converters with high-ratio transformers are widely used. However, high transformation ratio brings large secondary winding current, which causes large loss. To improve this defect, the current-doubler rectifier circuit and the LLC resonant converter is combined to build a new bidirectional DC/DC converter. The proposed topology not only reduces the secondary winding current but also reduces the number of MOSFETs, thus improving the efficiency of the converter. The working principle of the proposed converter is introduced, and the problem of voltage spikes in reverse operation is solved by means of ideally inverse coupled inductors. Through comparison and analysis, the feasibility of the proposed topology is verified and the results show that the proposed converter has higher efficiency than the traditional bidirectional LLC converter. © 2022 IEEE.

关键词： Topology

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A Five-Level Space Vector Modulation for Interleaved Vienna Rectifier With Reduced Harmonic Distortion and Line Current Ripple 5

A Five-Level Space Vector Modulation for Interleaved Vienna ...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Liu, Xiaokui Duan, Shanxu Song, Xuan Fu, Han Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

T-type Vienna rectifier are applied in various occasions due to fewer switching devices and lower line current ripple. Parallel converters with interleaved operation can achieve larger power capacity and improve the efficiency and power density of the converters. In interleaved Vienna rectifiers, the conventional 180° interleaved modulation can reduce harmonic distortion and line current ripple. However, since the parallel three-level converters can be considered as a single five-level converter, the performance of parallel converter is not fully exploited. A novel modulation for dual-channel interleaved Vienna rectifier is proposed, which can reduce the line current ripple and the current harmonic distortion. Compared with the conventional method, the proposed modulation strategy has better performance. Experimental results verify the system performance of the proposed modulation strategy. © 2022 IEEE.

关键词： Harmonic distortion

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A High-Temperature Superconducting Homopolar Inductor Alternator with Slotless Stator Core for High-Power Pulsed Power Supply

A High-Temperature Superconducting Homopolar Inductor Altern...

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2023 IEEE International Conference on Power Science and technology, ICPST 2023

作者： Liu, Longjian Yu, Kexun Xie, Xianfei Kunming University of Science and Technology Faculty of Electric Power Engineering Kunming China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350311358

Nowadays, with the development of laser weapons, the primary power supply of laser weapons puts forward more and more high demand for its performance. The pulsed power supply based on conventional homopolar inductor alternator (HIA) cannot meet the requirements any more. In order to improve the power density and efficiency, this paper proposes applying the high-temperature superconducting (HTS) HIA with slotless stator core to this power supply. In this paper, the design considerations of it are presented, and the comparisons between the two power supplies are discussed. The calculation results show that the power supply based on HTS machine has much larger power density than the conventional HIA, and the efficiency is also larger than the conventional HIA. This can improve the performance of laser weapons dramatically. © 2023 IEEE.

关键词： Efficiency

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Improved Resonant Frequency Tracking Strategy based on Load Parameter Prediction for Linear Oscillatory Machine

Improved Resonant Frequency Tracking Strategy based on Load ...

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2023 IEEE International Conference on Predictive Control of Electrical Drives and Power Electronics, PRECEDE 2023

作者： Gong, Yifan Cheng, Yang Xu, Wei Liao, Kaiju Ge, Jian Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350396867

As the key power part of the linear compressor, the linear oscillatory machine (LOM) has been paid more attention by both academia and industry recently for its compact size, high efficiency, low vibration, etc. In practice, the efficiency of LOM is significantly impacted by the changes in load parameters, of which the best working point can be tracked by the resonant frequency tracking control. However, the traditional resonant frequency tracking control with the idea of stroke-current phase suffers some serious problems, like slow tracking speed, low accuracy, large current peak during starting, fluctuate amplitude of piston, and so on. In this paper, a Kalman filter for the mechanical system of LOM is proposed, which avoids the impact of environmental noise and obtains the observed values of load parameters. On this basis, a parameter correction scheme based on gradient descent method is proposed. By calculating the corresponding gradient matrix, iterative adjustment and correction of the covariance matrix in the Kalman filter are realized. The combination of the two realizes the load parameter prediction of the LOM, and on this basis, completes the frequency control of the LOM. Comprehensive simulation results have fully demonstrated the advantages of proposed control strategy compared to those of traditional methods. © 2023 IEEE.

关键词： Natural frequencies

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