矩阵式晶闸管分频调速节能装置研究

分频调速是一种崭新的节能方法。介绍了分频调速的涵义,给出了主电路和矩阵式电子开关原理图．指出分频电路的9只双向晶闸管可分为三组,随后定义了开关函数S和开关矩阵S,并推导了分频电路的实现原理。其次介绍了在实现过程中需要重点解决的两大关键技术：一是在自然换相点处的电压过零触发和电流过零触发方式减少了内存占用：二是利用逻辑电路构成防误触发措施．根据脉冲的特点列出了真值表,并以此为依据设计了逻辑电路。从使用中验证,该装置对有级调速的风机、水泵负载是低投入、高回报的选择。     

长间隙触发真空开关动作特性的研究

介绍了长间隙触发真空开关动作特性的实验研究,包括工作过程、触发可靠性、触发时延以及抖动时间.实验表明,采用高压小电流击穿与低压大电流续流的触发电路,可保证触发可靠性;长间隙触发真空开关工作电压高,动作特性良好,有利于高功率脉冲技术的发展研究.     

基于TSC控制技术的快速响应自动消弧装置

自动消弧装置是由一种基于晶闸管投切电容(TSC)控制技术的自动调谐消弧线圈、接地变压器和互感器等组成的成套设备。它可对线路的单相接地故障做出快速响应,并精确补偿接地电流。此装置很好地解决了3个技术难点：第一,线路对地容抗的精确测量,误差在2%以下;第二,根据线路电容电流和人工中性点电压的变化来智能判别单相接地故障;第三,采取串联小电抗,过零投切和加装风机等措施,以确保晶闸管的安全运行。可编程逻辑控制器（PLC）、触摸屏式人机界面（HMI）和过零触发板构成了该装置的控制系统。模拟试验和实际应用表明该装置能够取得理想的效果。     

锰酸锂电池热失控特性研究

以方形锰酸锂电池为研究对象,利用ARC绝热量热仪研究电池热失控温度,通过跟踪搜索获得锰酸锂电池热失控温度为211.16℃。通过加热和过充不同触发方式诱发电池热失控。在加热触发热失控时,电池热失控后仅会多次喷射白色烟雾,无明火,电池表面最高温度411.5℃;在过充触发热失控时,电池本体鼓胀程度明显,爆喷后立即喷射剧烈火焰,持续一定时间后达到稳定燃烧,最后明火燃烧减弱直至熄灭,电池表面最高温度155.7℃。实验过程中采集电池正负极极耳及表面的温度,电池极耳及表面的温度大于80℃,温升速率大于1℃/s且持续3 s以上时,证明电池已发生了热失控,可以以上述参量作为电池热失控的判定依据。     

基于晶闸管反并联的有载分接开关的设计

设计了基于晶闸管反并联的有载分接开关的主接线形式,完成了有载分接开关自动调压工作流程的设计,同时还设计了晶闸管的触发电路和过电压RC缓冲电路。经理论分析本设计可以满足10kV电力用户有载调压的需求,具有广阔的发展前景。     

Current progress of study on gas electron multiplier

Recent progress of study on gas electron multiplier （GEM） has been described. Due to its fast time response and excellent position sensitivity, the GEM will find wide applications in particle physics, medicine and astrophysics. These potential applications have been briefly introduced.     

An integral-differential combined type event-triggered model predictive control for perturbed linear systems

An integral-differential combined (IDC) type event-triggered model predictive control (ET-MPC) strategy is constructed for linear time-invariant (LTI) systems in this paper. Compared with the standard ET-MPC method, the proposed MPC algorithm is developed based on an IDC type event-triggering mechanism (ETM), which takes both the integral and change rate of the error between the optimal prediction and the real state into the consideration for the construction of the triggering condition. In this way, the dynamic performance can be considered more comprehensively, for effectively reducing the calculation and communication burdens of the ET-MPC method. In addition, an improved robust constraint is used to deal with additive disturbances, and the dual-mode control method is employed in the development of the strategy. Then the parameter conditions guaranteeing the iterative feasibility of the proposed algorithm, the closed-loop stability of the LTI system, and the avoidance of Zeno behavior are given. Finally, two simulation examples demonstrate the effectiveness of the algorithm.