基于载波频率的高频电流传感器均流控制系统设计

为使支路电流与总电流之间的数值配比关系始终低于额定极值标准,从而避免高频传感器元件出现电流占空输出的表现情况,设计基于载波频率的高频电流传感器均流控制系统。在IGBT驱动电路的支持下,按需连接电容变压器、均流电感元件、滤波电流传感器三类硬件应用设备,再根据DSP控制单元中支路电流的输出水平,确定电量变换器设备所处的实时连接位置,完成高频电流传感器均流控制系统的开发与实现。根据电流循环谱的特征条件,计算一阶载波指标、二阶载波指标的计算数值,联合已知的载波系数参量,确定当前情况下的电流频率协方差标准,实现基于载波频率的电流传输行为估计,匹配各级软、硬件执行条件,完成高频电流传感器均流控制系统的设计。实验结果表明,随着基于载波频率的均流控制系统的应用,支路电流与总电流之间的配比系数极大值始终不会超过额定极值条件,能够较好抑制高频传感器元件出现电流占空输出的情况,符合实际应用需求。     

基于蓝牙的高压线电流自动化检测系统设计

在高压危险场所,为提高操作人员的人身安全,使用隔空测量数据是非常需要的,因此采用蓝牙通信系统实现了对远离危险场所进行测量和记录所需数据。本系统使用超低功耗性能优秀的MSP430系列单片机作为核心控制器件,由蓝牙PDA接收信号并对其进行相应的处理。整个系统可长时间供电,非常适合做便携式设备。     

A note to output feedback adaptive control for uncertain system with static nonlinearity

The problem of control design for a system represented as linear stationary and static nonlinear parts is considered. It is assumed that the linear part is unknown and strictly minimum phase. The nonlinear part is known inaccurately, it is irreducible to an input of the linear block, and generally does not satisfy sector restrictions. An adaptive regulator ensuring asymptotic stability is synthesized. The output of a control system, but not its derivatives, is used as a measured variable.     

一种EEPROM中高压产生电路的设计与实现

设计了一种应用于EEPROM的低电源电压的片内升压电路。基于电压倍乘电路,获得两倍于电源电压的驱动电压,用来驱动高压电荷泵电路得到EEPROM擦写用的15 V高压,实现EEPROM在1.3 V电压下稳定的工作。同时,基于负温度特性的电压分压电路实现电荷泵输出高压的负温度特性,提升了存储器在整个工作温度范围(-40℃~85℃)内的可靠性。设计的高压产生电路在0.13μm Embedded EEPROM CMOS工艺实现,工作电压为1.3 V~1.75 V,面积大小为600μm×80μm。     

A design scheme for incomplete state or output feedback with applications to boiler and power system control

The problem of designing a linear feedback when all state variables are not available is discussed. The design scheme is based on computation of a complete state feedback and a reduction to a specified structure. The reduction is made by approximation of the eigenspace corresponding to a set of dominant eigenvalues. The method consists of successive choices of weightings on this space. The method is applied to the control of a boiler and a three-machine power system. In the power system case the complete state feedback can be replaced by local output feedback without significant decrease in performance.The examples indicate that the proposed method is a realistic design method for multivariable systems.     

A note on the two disk mixed sensitivity design for control system with multiple output time delays

This note presents a tuning design method for output time delayed control systems that satisfies the two disk mixed sensitivity control design specification. The key features of this method are that it focuses on the two disk mixed sensitivity problem; it handles multiple time delays and allows the majority of the calculations to be carried out as in the time delay free case. A numerical example is given to show how the procedure works.     

船用交流供电系统电容漏电流自动测量补偿方法

舰船交流供电系统中。多采用中性点不接地运行方式，由于系统对地电容泄漏电流的存在．对电力系统供电安全带来隐患。本文针对舰船供电系统，提出了采用单片机控制系统，对电网对地电容漏电流进行实时跟踪测量。利用磁阀式消弧线圈对其进行自动补偿的方法。     

Modeling and simulation of direct output current control for LCL-interfaced grid-connected inverters with parallel passive damping

Conventional grid-connected inverters with a single inductor filter have the disadvantages of the large volume, high cost and system dynamic restriction. One of attractive solutions is to replace the first-order L filters with the third-order LCL filters. However, Instability phenomenon often appears in practical applications of the direct output current control for the LCL-interfaced grid-connected inverters. In order to clarify the point, the system control model is developed and the characteristic equation is deduced. Based on the Routh-Hurwitz stability criterion, a significant conclusion is reached that instability is inevitable in the direct output current control for the LCL-interfaced inverters without damping whatever P, PI or PID control is used. Conventional solutions are putting resistances in series with the LCL filter so as to improve the system stability margin, which is well known as the series passive damping. Nevertheless, the feasibilities of the parallel passive damping are rarely discussed. This paper reveals, for the first time, the precise-quantified relationship between the parallel resistances, control parameters and stability margins so as to provide a general design criterion for the direct output current control for the LCL-interfaced grid-connected inverters. And then the influence of nonlinear factors such as the switching and over modulation saturation on the validity of conclusions is discussed. In agreement with the theoretical analysis, the simulation results demonstrate that the parallel passive damping can effectively enhance the system stability of the direct output current control for the LCL-interfaced grid-connected inverters with the ultra-low extra losses.     

Adaptive output feedback control for a class of nonlinear systems with quantised input and output

This paper aims at addressing the problem of global adaptive stabilisation by output feedback for a class of nonlinear systems, in which both the input and output are logarithmically quantised. The nonlinear functions of the systems are not necessary to be completely known and contain time-varying parameters that belong to an unknown bounded set. Based on dynamic high-gain technique, a linear-like quantised controller computed from quantised output is constructed and a guideline is derived to select the parameters of the quantisers. It is proved that, with the proposed scheme, all the states of the system can be globally steered to the origin while keeping the other signals of the closed-loop system bounded.     

A design of gain-scheduled control for a linear parameter varying system: an application to flight control

For multi-input–multi-output, multi-parameter, nonlinearly parameter-dependent linear parameter-varying systems, a gain-scheduled control design method using both minimum sensitivity eigenvalue assignment and quadratic stability check is proposed. The designed controller guarantees the stability of the closed-loop system and assigns the eigenvalues of the frozen parameter closed-loop LPV system in the prespecified disjointed regions. Fewer controllers than that of any other method are needed to cover the whole parameter space. The proposed design method is applied to the design of a flight vehicle's back-to-turn (BTT) controller and nonlinear six-degree-of-freedom (6-DOF) simulations are performed to show its usefulness as a gain-scheduled controller design method.     

Using the decomposition principle to stabilize the nominal motion of a mechanical system with given accuracy

The Pyatnitskii decomposition principle is used to stabilize the nominal motion of a controllable scleronomic holonomic mechanical system under the influence of a bounded perturbing force. We find conditions on the controlling force and the set of initial states that guarantee that the motion of this mechanical system occurs close to the nominal motion in such a way that deviations from nominal values lie inside given boundaries. The decomposition principle serves here as an instrument to ensure practical stability in the sense of La Salle and Lefshetz.     

A design of saturating control with a guaranteed cost and itsapplication to the crane control system

A saturating control law which satisfies a constrained input condition and gives an upper bound of a given quadratic performance index is proposed, using a unique guaranteed cost control method. The case where modeling errors exist in the mathematical model is also considered. An experimental examination in a crane system has shown the practicability of the control law proposed here     

Using an integrated model learning system to construct the model base of a decision support system

The Model Base Management System (MBMS) in a Decision Support System (DSS) has become increasingly important in handling complicated decision problems. Traditionally, models are retrieved from the human experts. This approach has the disadvantages of low productivity and being subjective by different individuals. Although recent research projects include how to apply Artificial Intelligence approaches to automatic model retrieval, none of them provides an efficient and effective way to produce large-scale complicated models. In this article, an Integrated Model Learning System is introduced to learn new models from model instances. This system basically uses the Multiple Instance Explanation Based Generalization (miEBG) approach which is a modification of the Multiple Explanation Based Generalization (mEBG) approach to explain and generalize model instances by the Domain Theory. Different from other machine learning approaches, this approach takes advantages of using the Domain Theory to learn multiple explanation trees from instances, and then combines all trees to form a complete explanation tree which will be generalized into a useful model. In general, this approach provides the Model Base Management System an automatic way to retrieve new and more complete models from related instances in a self-learning fashion.     

硬标签插磁调频装置控制系统设计与试验

针对目前无源电子硬标签生产过程，传统硬标签谐振频率检测技术用于插磁调频控制存在的不足，设计用于插磁调频装置的控制系统。提出了基于电容补偿原理的单线圈敏感硬标签谐振频率传感技术，建模仿真分析基于此技术的信号幅值比和相位差变化特性，发现相位差值和极性都存在反转特性；以此为基础设计以MSP430F149单片机为控制中心，控制产生固定频率信号源，相位检测和相位极性判别电路；以相位变化为控制系统提供反馈信号，采用相位差值反转特性实现下压高低速切换，相位极性反转特性完成下压的控制决策，有效给出了一种不需扫频、不受互感系数时变特性影响的压磁调频控制系统。以生产58KHz“中榔头”硬标签进行测试，数据分析表明，此套控制系统高速运行在20mm/s，低速为5mm/s时，硬标签谐振频率控制误差在±75Hz内，方差为0.0006~0.0008KHz，运行稳定。     

A contribution to the organization of an expert system for process control of FMC

The distributed processes control model was investigated. A discussion of the automated acquisition of knowledge for process control is presented. The logical solution concept and basic details for implementing an interpreter are described. How it functions was considered, as well as the language for the control of expressions in base rules. A set of rules from the rule base are presented to show a simplified method of organizing a knowledge base by Petri net models of robots and machines.     

Stabilization and tracking control for an extended Heisenberg system with a drift

In this paper, we present sliding mode control algorithms, that are designed to practically stabilize (which means that the system state is stabilized to an neighborhood of the origin) the perturbed multidimensional Heisenberg system (therefore, with a drift) with additional two multidimensional integrators in the control inputs path. This result is then used to solve a tracking problem for the class of system which unperturbed model fails Brockett's necessary condition for the existence of a continuous, time independent feedback law.     

Detection of a brain aneurysm and a way to search for a brain aneurysm aimed at the development of a system to simulate an operation

In this article, a system is proposed for a simulated operation which would help a trainee surgeon to perform a medical operation to ensure that a cerebral aneurysm does not burst. The physician will have acquired empirical medical technologies from operations in traditional clinical teaching. However, there is a problem with safety and the burden to the patient. Therefore, recently a new training approach for a simulated medical operation using virtual reality has been explored. With the aim of developing a simulated system for a medical operation for a cerebral aneurysm, we considered the necessary functions such as detecting the brain aneurysm that is the target of the operation, and searching for a suitable blood vessel to make a plan for the operation.     

Game-theoretic approach to cooperative control of distributed energy resources in islanded microgrid considering voltage and frequency stability

A microgrid (MG) comprises a low-voltage network with several microsources, critical and noncritical loads, and energy storage systems (ESSs). It can operate in the grid-connected or islanded modes. In islanded mode, the voltage and frequency of the MG should be controlled by different distributed energy resources (DERs). This paper focuses on the analysis of frequency stability in an autonomous MG with renewable energy sources. In this paper, colonial competitive algorithms are used to design the DERs controllers in a cooperative manner that these controllers can keep the MG stable. Artificial neural network tool trained by Levenberg–Marquardt algorithm is used to generate controlling signal for every controller to keep the frequency and voltage in a desired range. This paper investigates a new optimal control solution for maintaining the frequency stability in the MG, by using a combination of an ESS and load-shedding procedure. The cooperative game theory is used in this paper to model the interaction among different DERs, ESSs, and loads.     

Globally stable robust tracking of nonlinear systems using variablestructure control and with an application to a robotic manipulator

The globally stable robust output tracking for a class of nonlinear systems is considered. Based only on the knowledge of the bounds on the uncertainties, a variable structure control (VSC) law is developed under the structure matching assumption. It is shown that the outputs of the closed-loop system asymptotically track given output trajectories despite the uncertainties while maintaining the boundedness of all signals inside the loop. All signals inside the loop are shown to be bounded for all time. To illustrate the efficiency of the controller, the approach is applied to the case of a two degree-of-freedom (DOF) robotic manipulator with variable payload. Numerical simulation results are also provided