The direct torque control theory is a kind of new control method after vector control theory in ac control field . it calculates and controls the torque and the flux of ac electromotor in stator coordinate using the voltage space vector . adopting the stator magnetism field direction method , it recurs to discrete pang - pang control producing pulse width modulation signal and controls the switch state of the transductor when better quality steady - state performance is produced 直接转矩控制技术是继矢量控制技术之后交流调速领域中新兴的控制技术，它采用空间矢量分析的方法，直接在定子坐标系下计算并控制交流电动机的转矩和磁链，采用定子磁场定向，借助于离散的两点式控制产生脉宽信号，直接对逆变器的开关状态进行最佳控制，以获得转矩的高动态性能。
Being the import unit of the distribution automation system , the transformer terminal unit namely ttu , samples ac input ( such as voltage , current and so on ) and state ( for example : switch state ) and executes remote control command ( open operation or close operation ) , ttu supervise the action of transformer , so it guarantee the security of das ( distribution automation system ) this paper is mainly based on the study of transformer terminal unit based on msp430f449 scm , the work of this paper includes : first , introduces the design of the hardware system and the software system of ttu , the core mathematical principle , and then , discusses the implementation of the communication protocol : iec870 - 5 - 101 and i2 c in detail 配变监测终端ttu ( transformerterminalunit )是配电自动化系统中的重要部分，在系统中完成采集模拟量(电压、电流等)和状态量(如开关状态) ，以及执行遥控(开、合操作)操作等功能，实现对配电变压器的实时监测，保障配电系统的可靠运行。本文主要研究了基于msp430f449单片机的配电监测终端的实现，较详细地介绍了系统的硬件设计、软件设计、核心算法，介绍了通讯规约iec870 - 5 - 101和i ~ 2c的实现。
The feeder reconfiguration for loss minimization in distribution systems is realized by changing the status of sectionalizing and tie switches . however , there are many switches in a distribution system . so it is difficult to construct a mathematic model of the relationship between the loads and the switch states with the minimum losses directly 在满足各种运行约束条件下，以网损最小为目标的配电网重构问题是个典型的非线性整数组合优化问题，由于开关很多，很难用常规的数学模型直接建立负荷与网损最小时的开关状态之间的关系。
Being the core unit of the distribution automation system , the feeder terminal unit , namely ftu . samples ac input ( such as voltage , current and so on ) and state ( for example : switch state ) and executes remote control command ( break or close ) . this paper is mainly based on the study of feeder terminal unit based on dsp 馈线自动化终端装置( feederterminalunit )是馈线自动化系统中的核心部分，在系统中完成采集模拟量(电压、电流等)和状态量(如开关状态) ，以及执行遥控(开、合操作)操作等功能。
Flux position & error in flux magnitude and error in torque are used as fuzzy state variables . fuzzy logic is used for choosing the switching state . a fuzzy logic controller can choose the switching states according to a set of fuzzy rules based on both specialists " experience and knowledge , which improves the response performance of the system effectively during start - up and change in load 作为本文的一个创新点，针对普通的直接转矩控制在给定转矩跃变时反应较慢的缺点，提出了一种模糊控制器，把磁链位置、磁链误差和转矩误差作为模糊输入变量，应用模糊逻辑来确定逆变器的开关状态，该模糊控制器根据一套基于专家经验和知识的模糊规则来选择开关状态，从而有效地提高了系统在启动和负载突变时的响应速度。
After the analysis of the state of converter switches , the voltage space vector is received . on the basis of hexagon stator flux trace method of traditional direct torque control , by changing the regulation of stator flux , hexagon and approximate round trace of stator flux can be got when using different voltage space vector . the fast regulation is realized when three - value regulator is used to adjust torque 通过对逆变器开关状态的分析进而得到电压空间矢量，并且论述了电压空间矢量与转矩和磁链之间的关系，使用两点式调节方法对定子磁链进行调节，实现六边形磁链轨迹和圆形轨迹方案，对转矩采用三值调节器进行调节，以实现转矩的快速调节。
But the power electronic devices in pwm power amplifier are working in the on - off state , easily producing the over - voltage and over - current phenomena . under tht condition the power electronic devices are bearing higher dv / dt , di / dt and more energy losses , influencing itself capability and life - span . at the same time , the dv / dt , di / dt also cause the severe electromagnetism disturbances , such as the disturbances in the photoelectric theodolite will make the other systems working improperly 然而在pwm功率放大器的主回路中电力电子器件工作在开关状态，易产生过压、过流现象，器件承受较高dv dt 、 di dt并产生较大的损耗，影响器件本身的性能和寿命，同时dv dt 、 di dt还会产生严重的电磁干扰，如在光学测量设备中，这种干扰将会影响其它系统正常运行。
Otherwise , an active integral chaotic measuring circuit is suggested based on the analysis of the present nonlinear circuits in this paper , which gets rid of nonlinear distortion of map function in constant - voltage mode and defect of constant - current source operating on - off state . using a general operational amplifier , high precision can also be obtained . a nth - order chaotic measuring system can be composed of its interconnection 另外，本文在分析原有非线性电路的基础上提出一种有源积分式混沌测量电路，它克服了恒压式测量电路映射函数存在非线性失真、恒流式测量电路不宜工作在开关状态的不足，利用普通的运放也获得较好的测量精度。
