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电气化行业的最新科研集锦(十四)

2023-04-21


01.江苏科技大学专家提出永磁同步电机转子位置与速度估算的新方法

针对电动助力车用永磁同步电机发生霍尔位置传感器安装偏移情况下电机运行异常的问题,江苏科技大学电子信息学院、苏州仕净环保科技股份有限公司、江苏云意电气股份有限公司的研究人员,提出一种基于带通频率跟踪滤波器的电机转子位置与速度估算方法,可提高电机运行的可靠性和稳定性。

http://www.cesmedia.cn/html/report/23030913-1.htm

 

02.高速磁浮永磁电机的三电平无速度传感器控制方法,可实现稳定运行

目前,国内外研究人员对高速磁悬浮永磁电机(High Speed Maglev-Permanent Magnet Motor, HSM- PMM)本体的多物理场研究较多,而针对高速磁悬浮永磁电机控制研究较少。高速磁悬浮永磁电机研究的热点之一是高速永磁电机转子结构、轴承-转子动力学和定子结构等。

功率变换器和高速永磁电机可靠控制是高速磁悬浮永磁电机稳定运行的前提条件。基于中点钳位(Nautral Point Clamped, NPC)三电平变换器的变频调速控制,主要的调制方式包括载波层叠脉冲宽度调制、空间矢量脉冲宽度调制、开关频率最优脉冲宽度调制和特定谐波消除脉冲宽度调制等

https://www.toutiao.com/article/7191841571417948704/?wid=1682006848945

 

03.哈工大学者提出集转速环控制和抗扰观测的复合滑模变结构控制方法

车辆电传动系统通常采用电机加变速箱方案实现低速大转矩、宽速域运行以满足车辆需求,但该方案存在换档时间长、体积大等弊端。双绕组永磁同步电机(Permanent Magnet Synchronous Motor, PMSM)利用电子开关使绕组低速串联、高速并联兼顾车辆全工况行驶需求,具有宽高效区、宽速域的独特优势,是车辆电传动系统的重要选择。对于双绕组永磁同步电机一方面要解决绕组串、并联模式参数不同带来的控制问题;另一方面要迅速满足重构前后的绕组电流关系。为此,哈尔滨工业大学电气工程及自动化学院的研究人员,针对此类电机的运行特点,研究了一种集转速环控制和抗扰观测的复合滑模变结构控制器,有效抑制了电机参数变化及绕组重构引起的转速动态波动问题,实现了该类电机全工况的高品质运行。

https://www.toutiao.com/article/7191850177366426172/

 

04.中国矿业大学科研团队提出开关磁阻电机直接瞬时转矩控制的新方法

基于传统滑模控制策略的开关磁阻电机直接瞬时转矩控制方法存在抖振大、动态时间长等问题,且利用机械方程获取参考转矩时需要实时观测系统负载。

直接瞬时转矩控制(Direct Instantaneous Torque Control, DITC)策略具有动态响应快等优点,并能降低SRM输出转矩脉动。为解决上述问题,中国矿业大学电气工程学院的研究人员,提出了一种基于改进滑模控制策略的直接瞬时转矩控制方法,有效解决了传统滑模控制策略中的抖振大和动态时间长等问题,且能避免实时观测负载转矩。

https://www.toutiao.com/article/7192570198807921184/

 

05.燕山大学专家提出无刷直流电机转子磁场定向瞬时转矩控制的新技术

无刷直流电机(Brushless DC Motor, BLDCM)因其结构简单、功率密度高、寿命长等优点,被广泛地应用于新能源汽车、医疗器械、航空航天等领域。方波电流驱动方式凭借着实现简单、经济可靠等优点,在无刷直流电机控制系统中得到广泛应用,但是由于非理想反电动势的作用以及绕组电感的存在,使无刷直流电机在运行过程中普遍存在较大转矩脉动,其中换相转矩脉动最为严重,最大可达约50%的平均转矩,严重制约了其在高精度场合的推广和应用。

https://www.toutiao.com/article/7192214622877975101/

 

06.南航学者发表低气压下多电飞机航空线缆局部放电特性的研究成果

多电飞机(More-Electric-Aircraft, MEA)通过采用先进的电气装置替换液压和气动装置,减轻飞机的整体质量,大幅减少燃料消耗。与传统飞机相比,多电飞机上的电力电子设备逐渐增多,为满足其日益增长的电力需求,飞机电力系统供电容量得到明显提高。飞机系统中供电电压由直流28V、交流115V提升至直流270V、交流230V,且供电电压仍呈上升趋势。在未来的发展中,多电飞机供电系统母线电压将达到数kV级数值。提高的额定功率将加剧线缆绝缘材料的退化进程,同时超负荷运行下线缆间的温度将升高,较高的温度加速绝缘材料的降解过程。多电飞机电气系统的绝缘将面临新的严峻挑战,亟待关注。

https://www.toutiao.com/article/7189874239871205922/

 

07.An Improved Model Predictive Direct Speed Control with Synchronous Prediction and Weight Factor Optimization for PMSM Application

In permanent magnet synchronous motor (PMSM) application, model predictive direct speed control is usually utilized to eliminate cascade loop structure existed in traditional vector control. However, asynchronous prediction equation (ASPE) with one-step delay is mostly required to achieve optimal voltage vector to drive the PMSM motors, which exist the problem of asynchronous prediction of speed and current. It is shown that in this paper the synchronous prediction equation (SPE) does not have the prediction delay, but it cannot realize the speed tracking control. Aim to solve the above problems, an improved PMSM model predictive direct speed control with synchronous prediction and Weight factor optimization is proposed in this paper. Firstly, the Taylor synchronization prediction equation (TSPE) is used to realize the speed and current prediction synchronization and the speed tracking control. Secondly, in order to improve the response speed of the system, a quadratic cost function considering the weight factor optimization is used for cost evaluation, and the Lyapunov direct method is used to design the weight factor with taking into account the stability and rapidity of the system. Finally, in order to verify the effectiveness of the proposed method, the MATLAB simulation and hardware-in-the-loop experiments are carried out. The results show that the proposed control method achieves predictive synchronous between speed and current, fast and stable speed tracking control, and the setting time is faster than the ASPE, and the TSPE without considering the weight factor.

https://link.springer.com/article/10.1007/s42835-023-01486-z

 

08.Solar PV Combined Efficient Torque Control of BLDC Motor Using Salp Swarm Optimization

This study provides an efficient torque and speed control method for brushless DC (BLDC) motor utilizing a fractional order proportional integral derivative (FOPID) controller based on the multiverse optimization algorithm and salp swarm optimization (SSO). When combined with a solar photovoltaic (PV) system and a voltage boosting architecture, standard PID controllers regulated the BLDC drive parameters due to their simplicity and improved steady-state performances. A solar PV system with a specific power range is chosen for the best output solution on the output side. The MPPT method employed is the incremental conductance approach for tracking maximum power from the source. However, it has a problem with unpredictability owing to load changes. The PID controller tuning also relates to the structure’s parametric uncertainties. Therefore, precise control methods may be offered with the aid of the FOPID controller to address the aforementioned issues. Simulation results of the proposed MVO and SSO-based FOPID controller for BLDC speeds run in the Matlab Simulink platform. To confirm the adaptability of the suggested control scheme for BLDC motor, the outcomes are interrelated using genetic algorithm, gray wolf, and PSO-based FOPID controllers.

https://www.tandfonline.com/doi/full/10.1080/15325008.2023.2196679?af=R

 

09.Modelling and analysis of electromagnetic force, vibration, and noise in permanent magnet synchronous motor for electric vehicles under different working conditions considering current harmonics

The vibration and noise of the permanent magnet synchronous motor (PMSM) is mainly caused by its electromagnetic force. Harmonic currents affect the vibration, and noise performance of PMSM by influencing its electromagnetic force. The regularity of electromagnetic force, vibration, and noise characteristics of PMSM for electric vehicles (EVs) under different working conditions influenced by the harmonic currents is studied. Firstly, the analytical model of electromagnetic force under the action of a harmonic current is derived, and the influence of harmonic currents on the electromagnetic force of PMSM is summarised. Secondly, a multi-physical field coupled vibration, and noise calculation model considering harmonic currents is established using the finite element method, and the vibration, and noise characteristics of PMSM under different operating conditions are analysed. The results show that the harmonic currents have different patterns of influence on the vibration, and noise of the PMSM due to the different advance angles and the saturation degree of the magnetic material under different working conditions. Finally, the validity of the theoretical analysis is verified by experiments, which has academic significance for vibration, and noise reduction of PMSMs for EVs.

https://ietresearch.onlinelibrary.wiley.com/doi/10.1049/elp2.12315?af=R

 

10.Performance comparison of liquid metal cooling system and regenerative cooling system in supersonic combustion ramjet engines

To further evaluate the performance of liquid metal cooling system (LMCS) at high Mach number, it is necessary to compare the performance between liquid metal cooling system (LMCS) and regenerative cooling system (RCS). In this paper, the experiment of GaInSn alloy's enthalpy at high temperatures is carried out and the applicable temperature is expanded to 873 K, which provides important data support for cooling system performance evaluation. And a system model including wall cooling, combustion, heat exchanging and power generating is built to study the performance of LMCS and RCS. The calculation results illustrate that LMCS with GaInSn alloy can significantly raise flight Mach number up-limit of scramjet engine to 9.69. Considering the mass penalty by comparison, the most suitable coolant is liquid lithium, while GaInSn alloy is better considering the comprehensive effects. In addition, LMCS is more suitable for high Ma conditions with high heat flux than RCS due to the excellent heat transfer capability of liquid metals. The LMCS with liquid lithium carries smaller mass of coolant than the RCS when the flight time is greater than 587.6 s at Ma 9, indicating that the mass penalty caused by liquid metals is not severe.

https://www.sciencedirect.com/science/article/pii/S0360544223008824?dgcid=rss_sd_all