外文翻譯--svc與statcom在電力系統(tǒng)中應(yīng)用的效益(已修改)
2025-06-01 08:23 本頁面
【正文】 中文 3480字 畢業(yè)設(shè)計(jì)外文翻譯 院 別 電氣與信息工程學(xué)院 專 業(yè) 電 氣工程與自動(dòng)化 班 級(jí) 電 氣 101班 學(xué) 號(hào) 姓 名 指導(dǎo)教師 2020 年 12 月 28日 1 Benefits of SVC and STATCOM for Electric Utility Application Abstract Examination of the behavior of SVCs and STATCOMs in electric power systems is presented. The paper is based on analytical and simulation analysis, and conclusions can be used as power industry guidelines. We explain the principle structures of SVCs and STATCOMs, the models for dynamic studies, and the impact of these devices on steady state voltage and transient voltage stability. Sensitivity analysis is provided which shows the impact of SVCs and STATCOMs with regard to work strength. Harmonic issues, space requirements, and price discussions are also briefly addressed. Index Terms —Dynamic Compensators, SVC, STATCOM, Short Circuit Capacity, Gain Sensitivity, Short Term Voltage Stability, Harmonics I. INTRODUCTION SHUNTconnected static var pensators (SVCs) are used extensively to control the AC voltage in transmission works. Power electronic equipment, such as the thyristor controlled reactor (TCR) and the thyristor switched capacitor (TSC) have gained a significant market, primarily because of wellproven robustness to supply dynamic reactive power with fast response time and with low maintenance. With the advent of high power gate turnoff thyristors and transistor devices (GTO, IGBT, …) a new generation of power electronic equipment, STATCOM, shows great promise for application in power systems [3,4]. This paper aims to explain the benefits of SVCs and STATCOMs for application in utility power systems. Installation of a large number of SVCs and experience gained from recent STATCOM projects throughout the world motivates us to clarify certain aspects of these devices. II. BASIC DESCRIPTION This section explains briefly the basic configuration of SVCs and STATCOMs: A. SVC The pensator normally includes a thyristorcontrolled reactor (TCR), thyristorswitched capacitors (TSCs) and harmonic filters. It might also include mechanically switched shunt capacitors (MSCs), and then the term static var system is used. The harmonic filters (for the 2 TCRproduced harmonics) are capacitive at fundamental frequency. The TCR is typically larger than the TSC blocks so that continuous control is realized. Other possibilities are fixed capacitors (FCs), and thyristor switched reactors (TSRs). Usually a dedicated transformer is used, with the pensator equipment at medium voltage. The transmission side voltage is controlled, and the Mvar ratings are referred to the transmission side. The rating of an SVC can be optimized to meet the required demand. The rating can be symmetric or asymmetric with respect to inductive and capacitive reactive power. As an example, the rating can be 200 Mvar inductive and 200 Mvar capacitive, or 100 Mvar inductive and 200 Mvar capacitive. B. STATCOM The voltagesourced converter (VSC) is the basic electronic part of a STATCOM, which converts the dc voltage into a threephase set of output voltages with desired amplitude, frequency, and phase. There are different methods to realize a voltagesourced converter for power utility application. Based on harmonics and loss considerations, pulse width modulation (PWM) or multiple converters are used. Inherently, STATCOMs have a symmetrical rating with respect to inductive and capacitive reactive power. For example,
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