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Louar FATEH,Ouari AHMED,Omeiri AMAR,Djellad ABDELHAK,Bouras LAKHDAR

《能源前沿（英文）》
2016年
第10卷
第2期
页码 155-163
*doi:*
*10.1007/s11708-016-0410-1*

摘要：
The interest for the use of renewable energies has increased, because of the increasing concerns of the environmental problems. Among renewable energies, wind energy is now widely used. Wind turbines based on an asynchronous generator with a wound rotor present the inconvenience of requiring a system of rings and brooms and a multiplier, inferring significant costs of maintenance. To limit these inconveniences, certain manufacturers developed wind turbines based on synchronous machines with large number of pairs of poles coupled directly with the turbine, avoiding using the multiplier. If the generator is equipped with permanent magnets, the system of rings and brooms is eliminated. The control of the permanent magnet synchronous generator (PMSG) can be affected with the implementation of various techniques of control. This paper presented a new approach mainly based on the control strategy of power production system based on the PMSG. In fact, a mathematical model that simulates the Matlab chain was established with the introduction of control techniques, such as direct control of the torque (DTC) to control the load side converter (LSC), the control of the speed of the turbine and the DC-bus voltage ensured by PI regulators. To show the performance of the correctors used, some simulation results of the system were presented and analyzed.

关键词： wind turbine permanent magnet synchronous generator (PMSG) converter proportional-integral (PI) control direct control of the torque (DTC) regulation

Akhil GUPTA,Saurabh CHANANA,Tilak THAKUR

《能源前沿（英文）》
2014年
第8卷
第4期
页码 464-479
*doi:*
*10.1007/s11708-014-0307-9*

摘要：
Dynamic voltage restorer (DVR) is used to protect sensitive loads from voltage disturbances of the distribution generation (DG) system. In this paper, a new control approach for the 200 kW solar photovoltaic grid connected system with perturb and observe maximum power point tracking (MPPT) technique is implemented. Power quality improvement with comparison is conducted during fault with proportional integral (PI) and artificial intelligence-based fuzzy logic controlled DVR. MPPT tracks the actual variable DC link voltage while deriving the maximum power from a photovoltaic array and maintains DC link voltage constant by changing modulation index of the converter. Simulation results during fault show that the fuzzy logic based DVR scheme demonstrates simultaneous exchange of active and reactive power with less total harmonic distortion (THD) present in voltage source converter (VSC) current and grid current with fast tracking of optimum operating point at unity power factor. Standards (IEEE-519/1547), stipulates that the current with THD greater than 5% cannot be injected into the grid by any distributed generation source. Simulation results and validations of MPPT technique and operation of fuzzy logic controlled DVR demonstrate the effectiveness of the proposed control schemes.

关键词： fuzzy logic maximum power point tracking (MPPT) proportional integral (PI) control voltage restorer

LU Yanjun, HEI Di, WANG Yuan, DAI Rong, LU Yanjun, LIU Heng, YU Lie

《机械工程前沿（英文）》
2008年
第3卷
第2期
页码 193-199
*doi:*
*10.1007/s11465-008-0023-4*

摘要：
The stability and coupling dynamic behavior of a journal active electromagnetic bearing rotor system are analyzed. The gyroscopic effect is considered in the rotor model. The system equations are formulated by combining equations for rotor motion and decentralized proportional integral differential (PID) controllers. A method combining the predictor-corrector mechanism and the Netwon-Raphson method is presented to calculate the critical speed at the corresponding Hopf bifurcation point of the system. For periodic motions, a continuation method combining the predictor-corrector mechanism and shooting method is presented. Nonlinear unbalanced periodic motions and their stability margins are obtained using the shooting method and established continuation method for periodic motions. With the change of control parameters, the system local stability and bifurcation behaviors are obtained using the Floquet theory. The numerical examples show that the schemes not only significantly save computing cost, but also have high precision.

关键词： proportional integral bifurcation corresponding integral differential predictor-corrector mechanism

面向TCP/AQM网络系统基于史密斯预估器的比例积分控制器的设计与分析 Research Articles

Ouassim MENACER1, Abderraouf MESSAI1, Lazhar KASSA-BAGHDOUCHE2

《信息与电子工程前沿（英文）》
2022年
第23卷
第2期
页码 291-303
*doi:*
*10.1631/FITEE.2000245*

摘要：
主动式队列管理（AQM）对于预防具有往返时滞的TCP/AQM系统的服务质量退化至关重要。往返时滞主要由数据包传播时延引起，但也可由队列操作的处理时间和动态改变的网络情况引起。本文聚焦带有时延不确定性的主动式队列管理数字控制器的设计与分析。该控制器基于史密斯预估器算法，我们称其为SMITHPI控制器。本文同时证明了该控制器的稳定性和抵御网络参数变化的鲁棒性，如传输控制协议源的数量、时延、用户数据电报协议流。运用NS-2仿真评估所提SMITHPI控制器的性能、鲁棒性和有效性。最后，将SMITHPI控制器与著名的主动式队列管理（称为比例积分控制器）进行性能比较。

Control algorithm of a servo platform

Shouyong XIE, Xiwen LI, Shuzi YANG, Mingjin YANG,

《机械工程前沿（英文）》
2010年
第5卷
第3期
页码 353-355
*doi:*
*10.1007/s11465-010-0098-6*

摘要：
According to the characteristics of the movement of a special-purpose three-axis servo platform, this paper presents an improved grey prediction proportional integral derivative (PID) control algorithm. Different weights at different time are given to different sampling moments in the algorithm, and the time meanings of the sample data are paid more attention. Simulation results show that the performance of response and stability of the platform of the improved algorithm is better than that of the traditional one. The control algorithm meets all requirements of the control system of the special-purpose three-axis servo platform.

关键词： grey prediction proportional integral derivative (PID) control improved algorithm weight servo platform

Proportional directional valve based automatic steering system for tractors

Jin-yi LIU,Jing-quan TAN,En-rong MAO,Zheng-he SONG,Zhong-xiang ZHU

《信息与电子工程前沿（英文）》
2016年
第17卷
第5期
页码 458-464
*doi:*
*10.1631/FITEE.1500172*

摘要：
Most automatic steering systems for large tractors are designed with hydraulic systems that run on either constant flow or constant pressure. Such designs are limited in adaptability and applicability. Moreover, their control valves can unload in the neutral position and eventually lead to serious hydraulic leakage over long operation periods. In response to the problems noted above, a multifunctional automatic hydraulic steering circuit is presented. The system design is composed of a 5-way-3- position proportional directional valve, two pilot-controlled check valves, a pressure-compensated directional valve, a pressurecompensated flow regulator valve, a load shuttle valve, and a check valve, among other components. It is adaptable to most open-center systems with constant flow supply and closed-center systems with load feedback. The design maintains the lowest pressure under load feedback and stays at the neutral position during unloading, thus meeting the requirements for steering. The steering controller is based on proportional-integral-derivative (PID) running on a 51-microcontroller-unit master control chip. An experimental platform is developed to establish the basic characteristics of the system subject to stepwise inputs and sinusoidal tracking. Test results show that the system design demonstrates excellent control accuracy, fast response, and negligible leak during long operation periods.

关键词： Automatic steering system Hydraulic circuit Proportional directional valve Proportional-integral-derivative (PID) control

Convergence performance comparisons of PID, MRAC, and PID+MRAC hybrid controller

Dan ZHANG,Bin WEI

《机械工程前沿（英文）》
2016年
第11卷
第2期
页码 213-217
*doi:*
*10.1007/s11465-016-0386-x*

摘要：

This study proposes a hybrid controller by combining a proportional-integral-derivative (PID) control and a model reference adaptive control (MRAC), which named as PID+MRAC controller. The convergence performances of the PID control, MRAC, and hybrid PID+MRAC are also compared. Through the simulation in Matlab, the results show that the convergence speed and performance of the MRAC and the PID+MRAC controller are better than those of the PID controller. In addition, the convergence performance of the hybrid control is better than that of the MRAC control.

关键词： proportional-integral-derivative (PID) control model reference adaptive control hybrid control convergence speed comparison

High-precision gyro-stabilized control of a gear-driven platform with a floating gear tension device

《机械工程前沿（英文）》
2021年
第16卷
第3期
页码 487-503
*doi:*
*10.1007/s11465-021-0635-5*

摘要：
This study presents an improved compound control algorithm that substantially enhances the anti-disturbance performance of a gear-drive gyro-stabilized platform with a floating gear tension device. The tension device can provide a self-adjustable preload to eliminate the gap in the meshing process. However, the weaker gear support stiffness and more complex meshing friction are also induced by the tension device, which deteriorates the control accuracy and the ability to keep the aim point of the optical sensors isolated from the platform motion. The modeling and compensation of the induced complex nonlinearities are technically challenging, especially when base motion exists. The aim of this research is to cope with the unmeasured disturbances as well as the uncertainties caused by the base lateral motion. First, the structural properties of the gear transmission and the friction-generating mechanism are analyzed, which classify the disturbances into two categories: Time-invariant and time-varying parts. Then, a proportional-integral controller is designed to eliminate the steady-state error caused by the time-invariant disturbance. A proportional multiple-integral-based state augmented Kalman filter is proposed to estimate and compensate for the time-varying disturbance that can be approximated as a polynomial function. The effectiveness of the proposed compound algorithm is demonstrated by comparative experiments on a gear-drive pointing system with a floating gear tension device, which shows a maximum 76% improvement in stabilization precision.

关键词： inertially stabilized platform floating gear tension device nonlinear friction disturbance compensation proportional multiple-integral observer

Power quality investigation of a solar PV transformer-less grid- connected system fed DVR

Akhil GUPTA,Saurabh CHANANA,Tilak THAKUR

《能源前沿（英文）》
2014年
第8卷
第2期
页码 240-253
*doi:*
*10.1007/s11708-014-0322-x*

摘要：
This paper presents a single stage transformer-less grid-connected solar photovoltaic (PV) system with an active and reactive power control. In the absence of active input power, the grid-tied voltage source converter (VSC) is operated in a reactive power generation mode, which powers the control circuitry, and maintains a regulated DC voltage to the VSC. A data-based maximum power point tracking (MPPT) control scheme which performs power quality control at a maximum power by reducing the total harmonic distortion (THD) in grid injected current as per IEEE-519/1547 standards is implemented. A proportional-integral (PI) controller based dynamic voltage restorer (DVR) control scheme is implemented which controls the grid side converter during single-phase to ground fault. The analysis includes the grid current THD along with the corresponding variation of the active and reactive power during the fault condition. The MPPT tracks the actual variable DC link voltage while deriving the maximum power from the solar PV array, and maintains the DC link voltage constant by changing the modulation index of the VSC. Simulation results using Matlab/Simulink are presented to demonstrate the feasibility and validations of the proposed novel MPPT and DVR control systems under different environmental conditions.

关键词： data-based maximum power point tracking (MPPT) total harmonic distortion (THD) proportional integral control voltage restorer pulse width modulation

Heng NIAN,Yi-peng SONG

《信息与电子工程前沿（英文）》
2015年
第16卷
第4期
页码 321-334
*doi:*
*10.1631/FITEE.1400170*

摘要：
This paper presents a multiple target implementation technique for a doubly fed induction generator (DFIG) under unbalanced and distorted grid voltage based on direct power control (DPC). Based on the mathematical model of DFIG under unbalanced and distorted voltage, the proportional and integral (PI) regulator is adopted to regulate the DFIG average active and reactive powers, while the vector PI (VPI) resonant regulator is used to achieve three alternative control targets: (1) balanced and sinusoidal stator current; (2) smooth instantaneous stator active and reactive powers; (3) smooth electromagnetic torque and instantaneous stator reactive power. The major advantage of the proposed control strategy over the conventional method is that neither negative and harmonic sequence decomposition of grid voltage nor complicated control reference calculation is required. The insensitivity of the proposed control strategy to DFIG parameter deviation is analyzed. Finally, the DFIG experimental system is developed to validate the availability of the proposed DPC strategy under unbalanced and distorted grid voltage.

关键词： Direct power control Doubly fed induction generator Unbalanced and distorted grid voltage Vector proportional and integral resonant regulator Parameter deviation

基于多模型融合驱动的锂离子动力电池荷电状态和容量联合估计研究 Article

熊瑞, 王榘, Weixiang Shen, 田金鹏, 穆浩

《工程（英文）》
2021年
第7卷
第10期
页码 1471-1484
*doi:*
*10.1016/j.eng.2020.10.022*

摘要：

锂离子动力电池（LIB）已成为各种电动载运工具的首选电源系统，包括电动汽车、电动轮船、电动火车和电动飞机。在全气候全寿命周期运行的电动载运工具中，锂离子电池的能量管理需要实时准确估计电池的荷电状态（SOC）和容量。本文提出了一种多阶段模型融合算法可协同估计SOC和容量。首先，基于正态分布假设，利用模型在不同老化状态下的残差均值和方差计算权重，建立参数稳定的融合模型。其次，将具有预测性的微分增益引入比例-积分观测器（PIO）以提高收敛速度。再次，将多阶段融合模型与比例-积分-微分观测器（PIDO）结合，建立了一种融合算法，可实现复杂应用环境下SOC和容量的协同估计。然后，讨论了融合算法的收敛性和抗噪性能。最后，搭建硬件在环平台，验证了融合算法的性能。不同老化状态和温度下的验证结果表明，融合算法可以实现SOC和容量的高精度协同估计，误差分别在2%和3.3%以内。

关键词： 荷电状态 容量估计 模型融合 比例-积分-微分观测器 硬件在环

4Pi荧光超分辨显微术综述 Review

郝翔, 李依明, 傅爽, 李旸晖, 许迎科, 匡翠方, 刘旭

《工程（英文）》
2022年
第11卷
第4期
页码 146-153
*doi:*
*10.1016/j.eng.2020.07.028*

摘要：
回顾这些历程，一个重要的里程碑是基于两个对置物镜的4Pi 显微架构及其超分辨版本的出现。鉴于此，本文综述了4Pi 超分辨显微术的近期进展。总体上，4Pi 超分辨显微镜为透明样品观测提供了一

种能够突破衍射极限、非侵入、各向同性的三维分辨率的技术手段。具体而言，本文针对目标开关和随机开关两个主要4Pi 超分辨显微术版本，讨论了它们的架构、原理、应用和未来发展趋势。

种能够突破衍射极限、非侵入、各向同性的三维分辨率的技术手段。具体而言，本文针对目标开关和随机开关两个主要4Pi 超分辨显微术版本，讨论了它们的架构、原理、应用和未来发展趋势。

一种新型的有向拓扑条件下普通线性多智能体系统的一致性协议 Article

Hao-liang LI, Ren-nong YANG, Qiu-ni LI

《信息与电子工程前沿（英文）》
2017年
第18卷
第8期
页码 1071-1081
*doi:*
*10.1631/FITEE.1601422*

摘要：
首先基于分布式PID（Proportional-integral-derivative）控制提出了一种新的一致性协议，然后通过变量转换将一致性问题转变为一个渐进稳定问题，通过状态投影方法给出了系统实现一致性的充分必要条件和一致性函数的显示表达式

关键词： 多智能体；一致性；PID（Proportional-integral-derivative）控制；线性矩阵不等式

Development of a novel two-stage proportional valve with a pilot digital flow distribution

Qiang GAO, Yuchuan ZHU, Changwen WU, Yulei JIANG

《机械工程前沿（英文）》
2021年
第16卷
第2期
页码 420-434
*doi:*
*10.1007/s11465-020-0622-2*

摘要：
Pilot two-stage proportional valves are widely used in high-power hydraulic systems. For the purpose of improving the dynamic performance, reliability, and digitization of the traditional proportional valve, a novel two-stage proportional valve with a pilot digital flow distribution is proposed from the viewpoint of the dual nozzle-flapper valve’s working principle. In particular, the dual nozzle-flapper is decoupled by two high-speed on/off valves (HSVs). First, the working principle and mathematical model of the proposed valve are determined. Then, the influences of the control parameters (duty cycle and switching frequency) and structural parameters (fixed orifice’s diameter and main valve’s spring) on the main valve’s motion are analyzed on the basis of theory, simulation, and experiment. In addition, in optimizing the value of the fixed orifice’s diameter, a new design criterion that considers the maximum pressure sensitivity, flow controllability, and flow linearization is proposed to improve the balance between the effective displacement and the displacement fluctuation of the main valve. The new scheme is verified by simulations and experiments. Experimental results of the closed-loop displacement tracking have demonstrated that the delay time of the main valve is always within 3.5 ms under different working conditions, and the tracking error can be significantly reduced using the higher switching frequency. The amplitude–frequency experiments indicate that a ‒3 dB-frequency of the proposed valve can reach 9.5 Hz in the case of±50% full scale and 15 Hz in the case of 0%–50% full scale. The values can be further improved by increasing the flow rate of the pilot HSV.

关键词： two-stage proportional valve digital flow distribution high-speed on/off valve position tracking characteristic dynamic performance

RGS16 regulated by let-7c-5p promotes glioma progression by activating PI3K-AKT pathway

《医学前沿（英文）》
2023年
第17卷
第1期
页码 143-155
*doi:*
*10.1007/s11684-022-0929-y*

摘要：
Gliomas are the most common central nervous system tumours; they are highly aggressive and have a poor prognosis. RGS16 belongs to the regulator of G-protein signalling (RGS) protein family, which plays an important role in promoting various cancers, such as breast cancer, pancreatic cancer, and colorectal cancer. Moreover, previous studies confirmed that let-7c-5p, a well-known microRNA, can act as a tumour suppressor to regulate the progression of various tumours by inhibiting the expression of its target genes. However, whether RGS16 can promote the progression of glioma and whether it is regulated by miR let-7c-5p are still unknown. Here, we confirmed that RGS16 is upregulated in glioma tissues and that high expression of RGS16 is associated with poor survival. Ectopic deletion of RGS16 significantly suppressed glioma cell proliferation and migration both *in vitro* and *in vivo*. Moreover, RGS16 was validated as a direct target gene of miR let-7c-5p. The overexpression of miR let-7c-5p obviously downregulated the expression of RGS16, and knocking down miR let-7c-5p had the opposite effect. Thus, we suggest that the suppression of RGS16 by miR let-7c-5p can promote glioma progression and may serve as a potential prognostic biomarker and therapeutic target in glioma.

标题 作者 时间 类型 操作

Modeling and control of a permanent magnet synchronous generator dedicated to standalone wind energy conversion system

Louar FATEH,Ouari AHMED,Omeiri AMAR,Djellad ABDELHAK,Bouras LAKHDAR

期刊论文

THD reduction with reactive power compensation for fuzzy logic DVR based solar PV grid connected system

Akhil GUPTA,Saurabh CHANANA,Tilak THAKUR

期刊论文

Stability and coupling dynamic behavior of nonlinear journal active electromagnetic bearing rotor system

LU Yanjun, HEI Di, WANG Yuan, DAI Rong, LU Yanjun, LIU Heng, YU Lie

期刊论文

面向TCP/AQM网络系统基于史密斯预估器的比例积分控制器的设计与分析

Ouassim MENACER1, Abderraouf MESSAI1, Lazhar KASSA-BAGHDOUCHE2

期刊论文

Proportional directional valve based automatic steering system for tractors

Jin-yi LIU,Jing-quan TAN,En-rong MAO,Zheng-he SONG,Zhong-xiang ZHU

期刊论文

Convergence performance comparisons of PID, MRAC, and PID+MRAC hybrid controller

Dan ZHANG,Bin WEI

期刊论文

High-precision gyro-stabilized control of a gear-driven platform with a floating gear tension device

期刊论文

Power quality investigation of a solar PV transformer-less grid- connected system fed DVR

Akhil GUPTA,Saurabh CHANANA,Tilak THAKUR

期刊论文

Multiple target implementation for a doubly fed induction generator based on direct power control under unbalanced and distorted grid voltage

Heng NIAN,Yi-peng SONG

期刊论文

Development of a novel two-stage proportional valve with a pilot digital flow distribution

Qiang GAO, Yuchuan ZHU, Changwen WU, Yulei JIANG

期刊论文