Suppression of capacitor switching transients using Symmetrical Structure Transient Limiter [SSTL] and its applications

2014 International Conference on Computation of Power, Energy, Information and Communication (ICCPEIC) Pub Date : 2014-04-16 DOI:10.1109/ICCPEIC.2014.6915385

Tejas M. Mahurkar, Meera Murali

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引用次数: 4

Abstract

A Symmetrical Structure Transient Limiter [SSTL] which is used to suppress capacitor switching transients is analyzed in this paper. The SSTL can automatically provide high impedance at the instant of capacitor energization, and, thus, the switching transients can be effectively suppressed. The SSTL acts as a short circuit during the steady state and, thus, has no effect in the circuit. As a result, the capacitor voltage and current waveforms will not be distorted. Due to the freewheeling effect in the SSTL, no transient over-voltage will appear across the switch contacts at the instant of capacitor de-energization even though the reactors are inserted into the circuit. This phenomenon of transient suppression by SSTL was verified by simulating the circuit in MATLAB simulink. As SSTL is widely used for suppressing the transients it was decided to implement the circuit developed for various applications to analyze its effectiveness. The first application is for reducing the transients produced during re-energization of a transmission line. The results of re-closing of Transmission line without and with SSTL were compared. Analysis shows that transients were reduced effectively. Another application for SSTL is to reduce load switching transients, the results of SSTL along with various combinations of loads such as R-L, R-C, R-L-C load were analyzed for load switching transients and the transients were found to be suppressed satisfactorily. Further for analyzing the real time effects of the SSTL a MATLAB simulink model for the shunt capacitor bank available in the College of Engineering, Pune's substation was created without and with SSTL taking in to account the practical considerations for modeling the capacitor bank and the results for it were analyzed. Device ratings for the hardware prototype to be fabricated were also calculated. A generalized code for calculating the device ratings for SSTL was developed.

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对称结构暂态限幅器抑制电容器开关瞬态及其应用

本文分析了一种用于抑制电容器开关瞬态的对称结构暂态限幅器。SSTL可以在电容器通电瞬间自动提供高阻抗，从而有效抑制开关瞬态。SSTL在稳态期间充当短路，因此在电路中没有影响。因此，电容器的电压和电流波形不会失真。由于SSTL中的自由旋转效应，即使将电抗器插入电路中，在电容器断电的瞬间，开关触点也不会出现瞬态过电压。在MATLAB simulink中对该电路进行了仿真，验证了SSTL的瞬态抑制现象。由于SSTL被广泛用于抑制瞬态，因此决定实现针对各种应用开发的电路，以分析其有效性。第一种应用是减少输电线路再通电时产生的瞬变。比较了无SSTL和有SSTL的输电线路再合闸的效果。分析表明，该方法有效地减小了瞬态。SSTL的另一个应用是减少负载切换暂态，分析了SSTL与R-L、R-C、R-L- c等负载的各种组合对负载切换暂态的影响，发现SSTL对暂态的抑制效果令人满意。为了进一步分析SSTL对并联电容器组的实时影响，我们在工程学院的浦那变电站建立了一个不考虑SSTL和考虑SSTL的并联电容器组的MATLAB simulink模型，以考虑电容器组建模的实际考虑因素，并对其结果进行了分析。还计算了要制造的硬件原型的器件额定值。开发了计算SSTL设备额定值的通用代码。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2014 International Conference on Computation of Power, Energy, Information and Communication (ICCPEIC)

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