晶闸管中频电源他激转自激控制系统

本文介绍一种用于大功率晶闸管中频电源的逆变控制系统，该系统采用了抗干扰能力强的ＣＭＯＳ系列集成电路，应用于我厂制造的ＫＧＰＳ５００－１型晶闸管中频电源，成功地完成了逆变控制。     

微机控制的晶闸管中频电源

叙述了一种专用于熔炼的晶闸管中频电源的组成和原理。利用微机对中频电源控制电路实现了数字化，其整流和逆变均由单片机控制，在保证设备稳定可靠的条件下实现最佳调节，从而满足了用户速度快、效率高的要求。     

双闭环中频感应加热电源

针对原功率单环晶闸管中频电源静态稳定性差、动态响应慢、超调量大等缺点提出并实现微机双闭环控制，采用ＰＩＤ数字调节，既保证了系统稳态无差，双改善了动态特性，提高了抗扰性能。     

支气管动脉灌注并栓塞治疗肺癌

本文对影响晶闸管中频电源的可靠性的因素，设计的基本要点及有关理想样机模型作探讨性阐述，目的在于提高晶闸管中频电源产品的可靠性。     

加热中小锻件的新型晶闸管中频电源

在分析一般晶闸管中频电源的基础上，介绍一种新型的晶闸管中频感应加热炉。着重阐述其逆变电路的电路结构、工作原理及工作特点。     

双混倍频式晶闸管中频装置

介绍感应加热用双混倍频式晶闸管中频电源装置的工作原理。该装置较目前国内外普遍采用的并联逆变式晶闸管中频装置优越。装置所用电路特别适合于制造频率较高的中频电源装置。     

晶闸管中频电源在电磁铸造领域的应用

本文介绍了晶闸管中频电源装置在电磁铸造工艺上的应用情况，以及感应线圈电流、频率、电压和功率等电参数的选择方法。     

晶闸管中频电源改造途径的探讨

探讨了晶闸管中频电源改造的途径,介绍了选取昌闸管电压、,电流和关断时间等主要电参数的方法。     

在感应淬火应用上并联振荡电路调谐探讨

简述并联振荡电路特点以及感应加热淬火用SCR晶闸管中频电源调谐方法等。     

一种高性能快速晶闸管串联使用保护技术及其应用

在中频电源领域,由于晶闸管的开关频率高,在关断过程中,产生很大的反向di/dt,严重威胁器件的安全.由于国外生产的快速晶闸管性能高,能承受比较高的dv/dt、di/dt;而国内dv/dt最高达500 V/μs、di/dt达200A/μs、tq：12μs.所以,一般RC吸收回路在国产中频电源中的保护就显得有些欠缺.介绍了一种快速晶闸管换相缓冲技术的设计原理,及其在国产中频并联谐振逆变器的应用.实践证明,该技术可改善多个串联快速晶闸管的动态均压特性,能有效地保证国产快速晶闸管在中频电源中的稳定运行.     

Impact of FACTS devices on exercising market power in deregulated electricity market

In power system studies, congestion in transmission lines and utilization of flexible alternating current transmission system (FACTS) devices are closely associated. These devices are very important due to their role in power delivery system enhancement. It is to be noted that the generation companies can exercise their market power which depends on the line flows, line constraints, generators’ location and its share to the individual loads. This issue cannot be overlooked as it creates monopoliness which is against the deregulated market policy. The objective of this paper is to study the impact of market power when FACTS devices like thyristor controlled switching capacitor (TCSC) and thyristor controlled phase angle regulator (TCPAR) are used under steady state operation. The market power is determined using nodal must-run share (NMRS) index for the standard IEEE 14-bus system with and without the above FACTS devices and the results obtained are compared. All the above simulations are conducted in a MATLAB 7.9-R2009b environment.     

Active current balance between parallel thyristors in multi-bridgeAC-DC rectifiers

New technology in digital excitation control provides a method to balance thyristor currents in parallel power rectifier bridges that provide current to a synchronous generator field. Balancing current between parallel bridges feeding a common load has traditionally been accomplished by using current balancing transformers in each bridge or adding inductance in series with the thyristors or SCRs (silicon controlled rectifiers). This paper introduces Active Current Balance, a new technique which modifies the average current in parallel leg thyristors to facilitate current balance between the bridges. This is accomplished by periodically inhibiting the firing of thyristors that carry more than the average current. The thyristors that are fired carry more current during this interval, increasing their average current. The thyristors that are not fired do not carry current during this interval and thus their average current is reduced. Using this technique (referred to in this paper as "skip firing"), the average current in parallel legs can be adjusted through feedback and control to equalize the average thyristor current loading. Additional feedback and control parameters are proposed, such as heatsink temperatures, which can be measured and utilized to program the "skip firing," in order to balance thyristor heat-sink temperatures     

A review of a quasi-static and a dynamic TCSC model

Two major thyristor controlled series capacitor (TCSC) models are reviewed and a comparison based on digital simulation is carried out showing the steady state reactance and the dynamic behavior obtained with them. Some simpler and equivalent expressions are developed     

变压器类负荷模拟量控制晶闸管调功器

介绍一种适用于变压器类负荷的晶闸管调功器,采用模拟量控制方式。文中阐述了采用脉冲宽度随导通角而变化的触发脉冲列的特殊方法,实现软启动和软关断的措施。     

A passivity approach to controller design for a TCSC

A passivity-based controller is designed for a thyristor controlled series capacitor (TCSC) aimed to enhance power system stability. A Hamiltonian representation of the power system is employed, revealing some structural properties instrumental for the controller design. Results show the capability of the proposed controller when the power system is subject to major disturbances     

通过SVC和TCSC联合改善异步机风电场暂态电压稳定性研究

用静止无功补偿器(SVC)和可控硅控制串联补偿器(TCSC)进行联合补偿,以提高异步风机风电场的暂态电压稳定性。在Matlab/Simulink中搭建了风电场及相关电网模型,通过仿真计算验证了SVC和TCSC对异步机风电场与电网暂态电压稳定性的作用。研究结果表明:在风速随机波动的情况下,SVC能动态地补偿无功功率,保持系统的暂态稳定性;当接入电网发生三相短路的大扰动故障时,TCSC能够有效地恢复机端电压,提高了风电场的低电压穿越能力。     

变压器式可控电抗器静态无功功率双向控制原理研究

针对目前柔性交流输电领域中广泛采用和研究的变压器式可控电抗器,提出一种双向无功控制原理,通过提高其副边补偿绕组中高次谐波滤波器电容的大小,实现不仅能吸收无功,而且可发出无功的双向补偿功能,从而在高压输电线路输送功率变化时,通过快速调整装设在控制绕组中的单个晶闸管模块的导通角,即可实现无功功率静态输出或吸收2种工作方式的控制,从而实现输电线路无功的柔性补偿。通过实验分析研究,证明所提出原理的可行性与正确性。     

Multivariable adaptive control for a thermal generator

A digital control system using the optimal control has been developed for a thermal power generator. In order to increase the generator control performance for improving the power system stability, this system supplies the excitation system directly with control signals and provides the governor system with control signals and supplemental control signals for a conventional governor. The system utilizes adaptive control for changes in generator nonlinear characteristics, as well as in power system characteristics. The principles and application of this system are described and results of simulation tests using a 1000 MVA thermal power plant model on a high-reliability AC/DC electric power system simulator are presented. The results verify the performance of this system, as well as the applicability of the system to actual plants