A design method of digital robust speed servo system considering output saturation

When a robust servo system having an integral element has a large error input, it often reveals windup phenomena caused by output saturation. It is very difficult for a strictly proper and high‐order controller to avoid having windup phenomena caused by output saturation. This paper newly proposes the digital robust speed servo system with a complete algorithm for consideration of output saturation. The proposed algorithm completely considers the output saturation of a robust speed controller connected to a PI current controller in series. Moreover, this method can be applied to both a PI speed controller and an H^∞ speed controller. The experimental results show that a robust speed servo system using the proposed algorithm has a good and stable response for a large step speed command. © 2000 Scripta Technica, Electr Eng Jpn, 132(3): 68–78, 2000     

航空宽调速交流伺服系统的模糊控制

针对航空宽调速交流伺服系统存在着高的功率密度、低转动惯量,系统必须采用高速、低惯量的永磁同步电动机特殊特点,依据模糊控制理论在宽调速系统中的应用,提出了此系统适用的模糊控制器设计的基本原则和变量的变区间模糊化方法,解决了在该系统的控制中不仅需要保证全调速范围有好的快速性和低的超调量,还要克服因电机非正弦磁场、齿槽效应与功率电路换流产生扰动等问题。经仿真验证了该设计方法的正确性。     

基于单片机的交流伺服电机转速控制系统设计

设计一种单片机控制下的交流伺服电机转速系统,详细介绍它的硬件组成原理及其软件实现过程,实现了对通用交流伺服电机的速度闭环控制。通过对实验结果的分析可以看出,本设计基本达到了系统对伺服电机转速控制的要求。这种方法可以广泛应用于电子机械、纺织机械、印刷机械等诸多行业中。     

An anti‐windup strategy for a feedback control system based on youla parametrization

In this paper, the design strategy of anti‐windup controller (AWC) for feedback control system is proposed. The proposed method is based on Youla parametrization of linear controllers in the framework of left coprime factorization. Conventional anti‐windup controllers have difficulty in optimization of parameters. The suppression effect of windup phenomena can be adjusted easily with the proposed AWC. The effectiveness of proposed method is shown with some numerical and experimental results. © 2002 Wiley Periodicals, Inc. Electr Eng Jpn, 139(4): 64–70, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10013     

二相混合式步进电动机矢量控制伺服系统

推导了二相混合式步进电动机基于磁网络的数学模型,给出了其矢量控制位置伺服系统的结构及仿真结果。同时说明了混合式步进电动机与永磁凸极同步电动机在作用机理上的相似性,指出混合式步进电动机伺服系统可参考凸极永磁同步电动机的控制策略来研究、设计。     

永磁交流伺服系统参数自学习模糊控制器设计与实现

为进一步改善永磁交流伺服系统的动静态性能,设计了一种基于单神经元的参数自学习模糊控制器,它在控制规则数与二维控制器相当的基础上,可实现三维模糊控制的效果。模糊推理方法基于相平面,直接输入连续量进行推理,计算量小。引入的单神经元采用改进的BP算法来实现比例因子的在线自学习。该控制器结构及算法简单,易于解析实现,具有通用性。将其用于永磁交流伺服系统,实验结果验证其控制性能较PI算法更佳,提高了系统的性能。     

Application of genetic algorithm to speed servo system and positioning system

This paper considers a genetic algorithm application to feedforward controllers of speed servo and positioning systems. The system consists of a conventional feedback controller and a feedforward controller. The parameters of the feedforward controller are regarded as the chromosome on a gene. The genetic algorithm is used to tune the parameters of the feedforward controller, the objective of which is to make the feedforward controller a dynamic inverse of the plant. The tracking error between the desired output and the actual output at every sampling period is used to calculate the fitness of one gene. The range of mutation is dependent on the magnitude of the tracking error, which ensures parameter convergence. The effect of fitness function and the width of mutation on tracking performances is investigated. The experimental results demonstrate the effectiveness of the proposed genetic algorithm in improving tracking performances.     

模糊控制原理在超声马达定位控制系统中的应用

超声波电机是一种新型的电机,它有许多电磁电机无法比拟的优点,但它的数学模型的强非线性和时变性,使高精度的位置定位非常困难。本文阐述了模糊控制在行波型超声电机位置定位系统中的应用,详细讨论了模糊控制器（双入单出）的设计,并在单向定位系统中进行了初步实验,取得了良好的定位效果。     

基于迭代学习控制的交流伺服系统PI参数自整定

针对交流伺服控制器PI参数自整定方法中,忽略了整定过程的周期性和所需的自学习能力,造成整定过程效率低、重复操作次数多、整定时间长问题,依据迭代学习控制,提出了一种交流伺服系统速度控制器PI参数自整定控制方案,使控制器能够进行仿人操作,根据历史控制经验不断地改进学习增益。仿真和实验结果均验证了方案的有效性,且结构简单,易于实现。     

基于模糊神经网络算法的交流伺服系统DSP控制

将神经网络与模糊逻辑控制结合起来,设计模糊神经网络控制器应用于交流伺服系统中的转速调节器,克服交流调速系统中参数漂移、非线性和耦合等因素的影响.针对模糊神经网络控制器运算量大、收敛慢的特点,硬件采用数字信号处理器(DSP)作为控制器运算单元,并在DSP上实现模糊神经控制算法,提高了系统实时性.实验结果表明,采用该控制器的调速系统具有较快的响应速度、较高的稳态精度和较强的鲁棒性.     

Design of deadbeat control system using multirate controller and its application to speed control of induction motor

This paper proposes a design method of an optimal deadbeat control system that takes into account the response between the sampling instant. The sequence of the deadbeat control signal that minimizes the quadratic performance index for the manipulated variable and deviation can be obtained easily from the matrix computation using the step response of the system. Then, the series compensation controller and series integral + local feedback compensation controller with fictitious sampler can be designed by using sequence of the control signal. The results of a computer simulation by the present method and application of this method to a speed control system of the inverter-fed induction motor have been studied in order to explore the control effect. The method seems to be useful for practical application. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (1): 83–92, 1997     

Maximum output power control system of variable‐speed small wind generators

This paper proposes a maximum output power control system for variable‐speed small wind generators. The proposed control system adjusts the rotational speed of a single‐phase AC generator to the optimum rotational speed, which yields the maximum output power according to the natural wind speed. Since this adjustment is performed on‐line in order to adapt to variations in wind speed, the rotational speed of the single‐phase AC generator is adjusted by controlling the generated current flowing in an FET (field‐effect transistor) device, serving as the generated power brake, which is linked directly to the single‐phase AC generator. In order to reduce heat loss from the FET device, a PWM (pulse width modulation) controller is introduced. An experimental model of the proposed control system was built and tested, and the validity and practicality of the proposed control system were confirmed by the experimental results. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 165(1): 9–17, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20692     

高阶无静差数字伺服系统的ITAE性能指标最优控制

解决了大功率数字伺服系统的技术难点,利用最优控制的原理,设计满足ITAE性能指标的控制系统.结合了PID控制,介绍了数字伺服系统的控制策略.在数学模型的基础上,应用二次型性能指标进行最优控制,来设计该对象的优良动态性能和高阶无静差系统的控制参数.以Matlab为编程环境,进行计算机仿真.系统具有对参数变化敏感、调节速度...     

Analytical design of PI controller for AQM with robustness adjustability

Based on a linearized TCP/AQMmodel, a new proportional integral (PI) controller design approach is proposed. This analytical approach applies H _∞ optimization and internal model control (IMC) theory to design active queue management (AQM) routers that support transmission control protocol (TCP) flows. The most important feature of the proposed scheme lies in that it can be explicitly tuned with a single parameter for the trade-off between performance and stability of the AQM control system. It is thus flexible and easy to use in design. The proposed method and the designed PI controller are verified and compared with other existing AQM schemes using ns-2 simulator. The results show the advantages of the new PI controller design approach for AQM routers supporting TCP flows. __________ Translated from Journal of Shanghai Jiaotong University, 2007, 41(5): 788–791 [译自: 上海交通大学学报]     

基于模糊PI的直流电动机调速系统优化设计

以给定的电动机为控制对象,分别运用几种工程设计方法设计了该电动机的控制系统.为进一步提高该电动机的工作性能,采用模糊PI两级复合控制策略.通过Matlab仿真比较了以上各工程设计方法之间的优劣,并证实模糊PI控制方法能使该电动机的动态性能获得很大改善.     

Proposal of current control method of high‐speed AC motor system

In this paper, a current control method for a high‐speed AC motor system is proposed. In high‐speed driving operation, the current controller tends to lose stability because of the dead time caused by computational delay and electromagnetic coupling included in the AC motor model. The main purpose of the proposed method is reduction of the dead time on the current controller. The proposed method is based on model predictive control and optimization of the start timing. The effectiveness of the proposed method is confirmed by simulation results. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 176(1): 37–45, 2011; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21083     

A servo system of AC motor based on voltage modulation fitting for FPGA and consideration of voltage saturation

This paper proposes a space voltage vector modulation (SVM) method for a speed servo system to obtain a quick current response. The proposed SVM method shortens the control lag time of the conventional SVM inverter. In addition, this proposed method is easily implemented in hardware using an FPGA (Field Programmable Gate Array) because the proposed SVM equations are transformed into expressions that hardly need multiplication. By using the proposed SVM method, the servo system realizes quick and stable current control with wide bandwidth. Moreover, by using PI controllers considering the voltage saturation and the torque limiter to the speed servo system, the servo system carries out stable speed control on voltage saturation. Both the proposed SVM method and the PI controllers considering voltage saturation are applied to the speed servo system of a vector controlled induction motor. The effectiveness of both the proposed SVM method and the PI controllers considering voltage saturation is verified by the experimental results. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 173(1): 60–68, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20989     

Structure and operation strategies of an automatic supervisory control system for the KEPCO UPFC

The Korea Electric Power Corporation (KEPCO) unified power flow controller (UPFC) is installed at the 154 kV Kangjin substation and is operated on the Kangjin–Jangheung transmission line. This UPFC has been operated by the manual set-point control method; however, it is very difficult for the operator to determine the operation point of UPFC in real-time. This paper proposes an automatic supervisory control system for the KEPCO UPFC to overcome the limitations of set-point control and increase the efficiency of UPFC. The functions and configuration of the system are described and the operation scheme that will be applied in the system is presented. In order to validate the proposed algorithm, a prototype program is developed and some simulations are conducted using the data collected from the load dispatch center in the KEPCO system. An erratum to this article can be found at     

Quasi oppositional harmony search algorithm based controller tuning for load frequency control of multi-source multi-area power system

This paper deals with the load frequency control (LFC) study of single-area and interconnected two-area power system having diversified power sources. The two areas considered in the present study are identical. Each area is having thermal, hydro and gas based power plants. Split-shaft model of gas turbine is used in the present work as one of the diversified generating unit for the purpose of LFC study. Optimal gains of the classical controllers (like integral controller, proportional–integral controller and proportional–integral–derivative (PID) controller, one installed at a time in the studied models) are obtained by using a novel music-inspired metaheuristic harmony search algorithm (HSA) which incorporates quasi opposition based learning technique for memory initialization and also for generation jumping. Single-area power system with diverse power sources is considered and its optimal transient performances are obtained and compared for step load perturbation. The same approach is further extended to two-area interconnected power system consisting of diverse power sources with nominal values of area input parameters. The performance of PID controller is found to be the best one for the studied power system models. It is also revealed that the performance of the interconnected two-area power system with AC–DC tie line is better in comparison to AC tie line.     

Examination of new vector control system of permanent magnet synchronous motor for high‐speed drives

A new vector control system for permanent magnet synchronous motor drives has been developed. To stabilize the current control loop in the high‐rotating‐speed region, a novel configuration of current controller is introduced. The unique characteristic of the proposed current controller is that the current regulator is connected to the conventional motor model in a series. By analyzing the transfer characteristics of the control, it became clear that the influence of the coupling component between the d–q axes can be deleted theoretically if the control parameters are set properly. The stability and torque response of the proposed vector control system were improved, and the effectiveness of the proposed controller was demonstrated by a time domain simulation and some experiments. In addition, the robustness of the controlling system was investigated experimentally. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 176(4): 61–72, 2011; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21123