基于晶闸管及IGBT的新型两电平逆变器

提出一种新颖的两电平电压型逆变器拓扑结构。该三相逆变器具有三个桥臂,每个桥臂由2个晶闸管、1个IGBT及4个二极管组成。晶闸管完成逆变器的相位定位,IGBT完成不同调制方式(SPWM、SVPWM、SHPWM等)的调制,二极管完成桥臂的换相。对基于晶闸管及IGBT的新型两电平逆变器的原理及拓扑结构进行详细的分析与设计,建立该新型两电平逆变器的仿真及实验平台,仿真及实验结果表明:与传统的两电平逆变器比较,可实现传统逆变器功能的同时,具有成本较低及开关损耗低的特点,在矩阵式逆变器领域更具优势,验证了所提方案的正确性。     

220kV成碧线可控串补晶闸管阀电气设计及仿真

介绍了220kV成碧输电线路可控串联补偿器晶闸管阀的研制过程。首先针对晶闸管阀的运行工况建立相应的仿真模型,通过仿真分析得出晶闸管阀的电气强度。再根据晶闸管阀的电气强度要求选择合适的晶闸管及其辅助元件参数以及阀串联数,并从电气和热学两方面对晶闸管阀进行校核和优化设计。最后介绍了晶闸管阀投入试运行前的出厂以及现场试验等。该晶闸管阀投入实际运行表明了其设计的合理性,为以后可控串补阀的设计提供了可供借鉴的经验。     

Fuzzy based damping controller for TCSC using local measurements to enhance transient stability of power systems

This paper proposes a local fuzzy based damping controller (LFDC) for thyristor controlled series capacitor (TCSC) to improve transient stability of power systems. In order to implement the proposed scheme, detailed model of TCSC, based on actual behavior of thyristor valves, is adopted. The LFDC uses the frequency at the TCSC bus as a local feedback signal, to control the firing angle. The parameters of fuzzy controller are tuned using an off-line method through chaotic optimization algorithm (COA). To verify the proposed LFDC, numerical simulations are carried out in Matlab/Simpower toolbox for the following case studies: two-area two-machine (TATM), WSCC three-machine nine-bus and Kundur’s two-area four-machine (TAFM) systems under various faults types. In this regard, to more evaluate the effectiveness of the proposed method, the simulation results are compared with the wide-area fuzzy based damping controller (WFDC). Moreover, the transient behavior of the detailed and phasor models of the TCSC is discussed in the TATM power system. The simulation results confirm that the proposed LFDC is an efficient tool for transient stability improvement since it utilizes only local signals, which are easily available.     

晶闸管串联调压电容无功补偿装置的研究

本文提出了一种用晶闸管开关装置－串联变压器改变电容端电压调节无功的补偿方法，阐明了这种补偿装置原理，分析了装置功率特性，估计了晶闸管开关换接过程的断态过电压和过电流大小，指出了降低这种过电压和过电流技术实现完全可能，并以实例和ＴＳＣ进行了比较，指出了这种装置成本要比ＴＳＣ低得多，宜于在高压电网中使用。     

Pole placement technique for PSS and TCSC-based stabilizer design using simulated annealing

A pole placement technique for power system stabilizer (PSS) and thyristor controlled series capacitor (TCSC) based stabilizer using simulated annealing (SA) algorithm is presented in this paper. The proposed approach employs SA optimization technique to PSS (SAPSS) and TCSC-based stabilizer (SACSC) design. The design problem is formulated as an optimization problem where SA is applied to search for the optimal setting of the proposed SAPSS and SACSC parameters. A pole placement-based objective function to shift the dominant eigenvalues to the left in the s-plane is considered. The proposed SAPSS and SACSC have been examined on a weakly connected power system with different disturbances, loading conditions, and system parameter variations. Eigenvalue analysis and nonlinear simulation results show the effectiveness and the robustness of the proposed stabilizers and their ability to provide efficient damping of low frequency oscillations. In addition, the performance of the proposed stabilizers outperforms that of the conventional power system stabilizer (CPSS). It is also observed that the proposed SACSC improves greatly the voltage profile of the system under severe disturbances.     

EAST托卡马克大功率双向直流快速晶闸管开关可靠关断理论分析及参数优化设计

对EAST托卡马克极向场电源系统的关键设备之——大功率双向直流快速晶闸管开关的基本工作原理，即强迫换流技术进行深入的理论分析，得出直流晶闸管开关可靠关断理论判据。并在此基础上进行了参数的优化设计。最后对换流支路分布电阻对关断特性的影响进行了分析。所有这些工作为大功率双向直流快速晶闸管开关的研制成功提供了坚实的理论保证。     

TCSC模式切换控制方法的研究

可控串联补偿(Thyristor Controlled Series Compensation,TCSC)的模式切换对电力系统的稳定控制具有重要意义,是TCSC的关键问题之一.文章在仿真建模的基础上,提出了一套切实可行的TCSC模式切换策略.通过强制晶闸管支路电流与线路电流同步,实现由容性微调或Block模式到Bypass模式的切换;在由容性微调或Block模式到感性微调的切换策略中提出了容许区间触发的方法.为及时向切换控制提供线路电流同步信号,提出了一种预测电流过零的方法.仿真结果表明,文章提出的切换策略能使切换过程平稳迅速,且动态特性良好,具有较强的实用性.     

晶闸管软起动器在离心式通风机上的应用

本文介绍了晶闸管软起动器在离心式通风机上的应用,并详细阐述了晶闸管软起动器的分类及特点,风机的分类及其工作原理。     

基于晶闸管的中压固态开关触发技术

介绍晶闸管触发技术在固态开关中的应用,指出电控晶闸管的不足之处,提出光控晶闸管在固态开关中的应用优势。     

触发电路的性能分析及比较

可控硅触发电路是通过调整可控硅的导通角或周波占空比等技术来实现电气设备的电压电流功率调整的一种电力控制器,研究了几种可控硅触发电路的基本结构、工作原理和工作特性等,结合实验测量讨论了各种触发电路的优缺点。与此同时对实验电路进行了分析,阐明了各器件的工作环境、在电路中的作用,说明了操作方法和注意事项。最后,通过实验测得这几种触发电路的输出波形,并对实验结果进行了分析,为今后物理实验的教学提供依据。