PIER C | PIER Journals

2024-10-21

PIER C

Vol. 149, 47-58, 2024

download: 45

Double Closed-Loop Model-Free Super-Twisting Terminal Sliding Mode Control Algorithm of IPMSM Based on Third-Order Super-Twisting Observer

Qianghui Xiao , Zhi Wang , Xiaorui Wei , Yuxin Yang , Yushuang Zhang and Zhun Cheng

To solve the problem of poor control performance of internal permanent magnet synchronous motors (IPMSM) due to parameter perturbations and external perturbations when adopting mode-free sliding mode control (MFSMC) algorithm, a double-closed-loop model-free super-twisting terminal sliding mode control (MFSTTSMC) algorithm of IPMSM based on third-order super-twisting observer (TOSTO) is proposed. Firstly, according to the new model-free control (MFC) algorithm, an ultra-local expansion model of IPMSM speed-current double closed-loop is established. Secondly, based on the ultra-local expansion model, a double closed-loop MFSTTSMC is designed to achieve global rapid convergence of system state errors. At the same time, a TOSTO is designed to estimate the disturbance in real time and carry out feedforward compensation, which enhances system robustness. Finally, the viability and superiority of the proposed control algorithm is demonstrated through simulation and experiments.

Double Closed-loop Model-free Super-twisting Terminal Sliding Mode Control Algorithm of IPMSM Based on Third-order Super-twisting Observer

2024-10-21

PIER C

Vol. 149, 37-45, 2024

doi:10.2528/PIERC24080702

download: 14

Research on Ultra Narrow Size Microstrip Multiband Antenna Suitable for Wireless Repeaters in Mine Tunnels with Different Cross-Sections

Yun Li , Peng Chen and Bo Yin

Through the analysis of experimental data, it is found that the optimal communication frequencies of mine tunnels with different cross-sections are different. These optimal operating frequency bands (580-600 MHz, 806-826 MHz, 1427.9-1447.9 MHz, 2401.5-2481.5 MHz, 5150-5600 MHz) are not only numerous, but also wide-ranging. Meanwhile, because the wireless repeater in the mine tunnel has great restrictions on the antenna size, the antenna has to be designed in a very small range of transverse size. In this paper, an ultra-narrow sized multi-frequency dipole (0.41λ × 0.04λ) is proposed to cover the optimal communication bands of underground mine tunnels with different cross-sections. This multibranch dipole consists of three main parts: lateral long branch, middle short branch, and end-loaded reverse branch. By adjusting the length of the two lateral long branches and utilizing the high harmonics, the antenna covers the lowest and highest operating bands that differ by a factor of seven. The middle short branch is one of the contributors to 1.4 GHz band. Meanwhile, the performance of the antenna at high frequencies is optimized by adjusting the distance between branches. The bandwidth of 1.4 GHz band is expanded by the loaded reverse branches. The test results are in good agreement with the simulation data, and the antenna covers all the optimal communication frequencies of underground mine tunnels with different cross-sections. Its peak gain at the resonance point is greater than 0 dBi, and the structure is simple.

Research on Ultra Narrow Size Microstrip Multiband Antenna Suitable for Wireless Repeaters in Mine Tunnels with Different Cross-sections

2024-10-21

PIER C

Vol. 149, 25-35, 2024

doi:10.2528/PIERC24091101

download: 29

Design of Compensated PLL for Position Sensorless Drives of PMSMs

Han Lin , Shanshan Wang , Zhonggen Wang , Xiaobing Zhu and Wenyan Nie

To filter out the high harmonic content of the back electromotive force (EMF) in the conventional sliding mode observer (SMO), a novel flux SMO (FSMO) is designed in this paper. The feedback matrix is designed to replace the external filter or other modules, and its higher-order feedback characteristics further enhance the convergence of the FSMO. The Lyapunov function is used to assess the stability of the FSMO. Importantly, a compensated phase-locked loop (CPLL) with an angular compensation strategy is used to extract both position and speed information, resulting in less speed fluctuation and lower position estimation error. Furthermore, the simulation model and experimental platform are developed to evaluate the reliability of the proposed method. Both simulated and experimental results confirm that the proposed hybrid control algorithm performs well in both steady state and dynamic one, high or low speed of the system, with suppressed harmonics of 50.1% and 7.3%, respectively, and an improved response time of 54.1%, providing a concrete program for sensorless control of permanent magnet synchronous motors (PMSMs).

Design of Compensated PLL for Position Sensorless Drives of PMSMs

2024-10-20

PIER C

Vol. 149, 15-23, 2024

doi:10.2528/PIERC24072801

download: 25

Speed Control of Synchronous Reluctance Motor with Composite Controller Based on Super-Twisting Sliding Mode

Yinhang Ning , Zhihao Huang , Benqing Lv , Longlong Fu and Zhaozhuo Li

Synchronous reluctance motor (SynRM) has been a hot research topic in recent years. In this paper, a composite speed controller based on the concept of super-twisting sliding mode (STSM) control is designed and innovatively applied to SynRM. For current control, the maximum torque per ampere (MTPA) strategy is used. For torque control, a design method based on an STSM controller is given. In order to solve the chattering phenomenon existing in STSM, a simple structure disturbance observer (DOB) is further introduced as a feed-forward compensation to offset the disturbances. A novel composite sliding mode speed controller is formed based on DOB and STSM. By using Matlab/Simulink, a composite sliding mode speed control system was built. The characteristics of the motor such as current, speed, and torque were researched. Compared to the STSM controller, the speed overshoot of the new controller is reduced by up to 50% (for no-load start). The speed drop is reduced by up to 75% (for sudden load), and the recovery time is shortened by up to 50%. The results show that the designed composite speed control system has better dynamic performance.

Speed Control of Synchronous Reluctance Motor with Composite Controller Based on Super-twisting Sliding Mode

2024-10-19

PIER C

Vol. 149, 9-14, 2024

doi:10.2528/PIERC24080901

download: 31

A Novel Knowledge-Based Neural Network Approach to the Small-Signal Modeling of Packaged Diodes

Wenyuan Liu , Ningning Yang , Shuxia Yan and Yanlin Xu

This paper proposes a novel knowledge-based neural network approach that, in the absence of specific device SPICE models, can utilize the measured data of actual diode devices to map the existing diode coarse model to a more accurate package model through neural network mapping techniques, thereby achieving precise and efficient modeling of the small-signal characteristics of diode devices. A knowledge-based neural network model for packaged diodes is proposed, which enhances modeling accuracy by learning the discrepancies between the diode coarse model and the actual device data. A training method for rapid parameter adjustment is suggested, where the neural networks within the input and output packaging modules automatically learn and adjust, continuously optimizing their internal parameters to enhance modeling efficiency. Modeling experiments conducted on the measurement data of the MA4AGFCP910 diode show that the proposed packaged diode model can effectively and accurately match the small-signal characteristic data of the diode device.

A Novel Knowledge-based Neural Network Approach to the Small-signal Modeling of Packaged Diodes

2024-10-18

PIER C

Vol. 149, 1-8, 2024

doi:10.2528/PIERC24091102

download: 20

Bandwidth Enhancement of SIW-Fed Dielectric Rod Antennas via Tapered Grating

Shreya Sudhakaran Menon , Khagindra K. Sood , Nalesh Sivanandan and Supriya M. Hariharan

This study presents a technique to enhance the bandwidth of substrate-integrated dielectric rod antennas. The technique involves adding a tapered grating at the antenna input, which improves impedance matching. The tapered grating converts some of the guided mode fields into leaky mode fields, leading to improved matching and broader bandwidth. The effectiveness of this approach is demonstrated through simulations and measurements, showing significant bandwidth enhancement in both X-band and Ku-band designs. The design parameters and optimization process are detailed, and the scalability of the technique is confirmed by its successful application to different frequency bands. A design for X-band demonstrates the effectiveness of this technique, yielding a bandwidth of 40%. Additionally, the technique is applied to a previously reported Ku-band design, resulting in an improved bandwidth of 52%, up from 36%. The paper concludes that the proposed tapered grating is an effective approach to enhance the bandwidth of substrate-integrated dielectric rod antennas, particularly for medium or high-gain applications.