基于最优潮流并计及TCPST的可用输电能力计算

基于最优潮流(OPF)方法.将可用输电能力的计算转化为求解多约束的非线性规划问题,建立了计及品闸管控制的移相器(TCPST)的ATC计算模型.利用功率注入法将TCPST对电网的控制作用通过对相关节点的等效注入功率来体现,从而使与TCPST关联的节电导纳矩阵南非对称阵变为对称阵.进而大大简化了潮流计算程序.在算法上采用半光滑牛顿算法,IEEE30节点系统的计算结果表明,所提出的模型及算法正确.     

中压异步电动机软启动器的MATLAB仿真研究

异步电动机软启动器的MATLAB仿真是利用Simulink仿真工具对异步电机启动过程进行仿真，并取得非常理想的仿真效果。这说明了用Simulink及M语言编写的函数对软启动器的启动过程进行仿真分析是一种非常方便有效的方法，并且验证了电动机软启动的启动性能远远优于直接启动。并给出了仿真波形。     

盐浴炉的温度控制系统

设计了一套单片机控制的盐浴炉温度控制系统．利用S型铂铑—铑热电偶检测温度，热电偶进行冷端补偿，热电偶检测的信号通过放大、采样保持、模数转换再送单片机保存，采用分段查表法获取各点温度．选用可控硅过零触发自动控制盐浴炉温度，控制周期为100个三相交流市电周期，即2s．由单片机控制可按预设温度曲线进行加热，并可实时显示加温曲线．     

谐波功率测量仪原理

晶闸管工作时产生的高次谐波电流将引起电路中电流波形发生畸变,并产生畸变功率,目前尚无专门仪表测试畸变功率。文章以功率四边形方法为基础,给出了谐波功率测量仪的设计原理。     

A Novel Adjustable Peterson Coil

The paper presents a novel continuously adjustable Peterson coil. If it is used in the system of neutral point grounding through Peterson coil, not only the high price can be reduced and the complicated problems can be solved of which the high voltage inductance controlling systems, but also advantages of the system of neutral point grounding though Peterson coil can be shown. It is introduces that how adopts low voltage thyristors for continuing adjusting inductance of the Peterson coil of which the voltage level ranges from 6 kV to 66 kV. This paper discusses the formula of calculating the inductance variable ranges and the harmonic currents which presents stable harmonic current under the phase controlled mode also. The theory of the designing coil is verified by the Saber simulation and practicality experiment.     

A Digital Thyristor Trigger Control System of Three Phase Full-control-bridge on the Base of Singlechip Controller

A new type of digital trigger control system on the base of Singlechip Controller is proposed for water power station control system. The trigger use the singlechip controller's highspeed output port skillfully, and this system included controller and trigger,so as to reduce the component, reduce the cost and make the system more integrated, more precise and more reliable and advanced the hydro excitation control system. In this system, we use new electric technology, new detection technology and new automatic theory, so as to make the system more perfect and more intelligent. It has overcome the disadvantage of simulation integrate circuit in above.     

基于单片机的有载分接开关控制系统的设计

为了提高配电变压器的有载分接开关自动调压功能,保证电力系统供电的可靠性,利用电力电子器件及单片机控制技术,设计了以晶闸管反并联作为分接开关的执行机构,配以单片机AT89C52为核心的控制系统来调节配电变压器分接头,进而实现有载分接开关自动稳压的功能。     

基于工业PC机的基波无功分相补偿控制器的研制

介绍以工业ＰＣ机为核心的低压配电网基波无功动态补偿装置控制器的硬件结构、快速检测基波无功的方法和电路、晶闸管触发电路和电容器的投切控制方式等,解决了控制器应满足实时检测、快速响应和高可靠性等实际问题,提高了供电质量,确保了配电网的安全、经济运行。     

软启动器的开发与设计

设计了一种以80C196KC单片机系统为核心，双向可控硅作为凋压元件的异步电动机软启动器、接口电路及软件结构等。应用此设备起动电机时，可以使启动电流从零线性上升至设定值，实现平稳起动，对电动机无冲击，提高供电可靠性，同时还提供软停车功能和多种保护。     

Malfunction Diagnosis of Three-phase Full-bridge Controlled Rectifier Based on BP Neural Network

The diagnosis of the power electronic circuit is very intricate. One of the main reasons is that the structure of the circuit will change if the power device is not working .The thyristor is the easiest to be mangled. So diagnosing the malfunction is the most important about the diagnosis of the power electronic circuit. The paper puts forward a malfunction diagnosis of the thyristors of three-phase full-bridge controlled rectifier with BP neural network. After analyzing the output waveforms of malfunctioning circuit and training a BP neural network with the sampling data of malfunctioning waveforms, a well training BP neural network is constructed and used to diagnose the malfunction. The simulation and experiment demonstrate that this method is valid.