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1、精选优质文档-倾情为你奉上广西科技大学毕业设计外文翻译 院 别 电气与信息工程学院 专 业 电气工程与自动化 班 级 电气101班 学 号 7 姓 名 岑华蒙 指导教师 周晓华 2013年12月28日Benefits of SVC and STATCOM for ElectricUtility Application Abstract- Examination of the behavior of SVCs and STATCOMs in electric power systems is presented. The paper is based on analytical and simu
2、lation 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 t
3、he impact of SVCs and STATCOMs with regard to network 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, HarmonicsI. INTRODUCTIONSHUNT
4、-connected static var compensators (SVCs) are used extensively to control the AC voltage in transmission networks. Power electronic equipment, such as the thyristor controlled reactor (TCR) and the thyristor switched capacitor (TSC) have gained a significant market, primarily because of well-proven
5、robustness to supply dynamic reactive power with fast response time and with low maintenance.With the advent of high power gate turn-off thyristors and transistor devices (GTO, IGBT, ) a new generation of power electronic equipment, STATCOM, shows great promise for application in power systems 3,4.T
6、his 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 DESCRIPTIONThis sect
7、ion explains briefly the basic configuration of SVCs and STATCOMs:A. SVCThe compensator normally includes a thyristor-controlled reactor (TCR), thyristor-switched capacitors (TSCs) and harmonic filters. It might also include mechanically switched shunt capacitors (MSCs), and then the term static var
8、 system is used. The harmonic filters (for the TCR-produced 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 de
9、dicated transformer is used, with the compensator 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 res
10、pect 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 voltage-sourced converter (VSC) is the basic electronic part of a STATCOM, which converts the dc voltage into a t
11、hree-phase set of output voltages with desired amplitude, frequency, and phase. There are different methods to realize a voltage-sourced converter for power utility application. Based on harmonics and loss considerations, pulse width modulation (PWM) or multiple converters are used.Inherently, STATC
12、OMs have a symmetrical rating with respect to inductive and capacitive reactive power. For example, the rating can be 100 Mvar inductive and 100 Mvar capacitive. For asymmetric rating, STATCOMs need a complementary reactive power source. This can be realized for example with MSCs.VII. THE FUNCTIONAL
13、 RATING CONCEPTTraditionally, SVCs of a common design have been used to handle different types of network problems. The trend today, however, is to tailor SVCs for their intended use. This is important in order to make SVCs cost efficient.For steady state voltage support, i.e., to follow the daily l
14、oad pattern, bulk reactive power combined with stepless smooth voltage control is desired. Vernier voltage regulation can be provided by a TCR running in parallel with harmonic filters. The bulk reactive power is provided by mechanically switched capacitor banks (MSCs) or reactors (MSRs) governed by
15、 the SVC controller. Thus SVCs serve the purpose of continuously maintaining a smooth voltage, piloting the MSC switching.If the task is to support a system limited by post contingency voltage instability or unacceptable voltage levels, a large amount of quickly controllable reactive power is needed for a short time duration. An SVC with additional TSCs is an excellent choice. Post recovery voltage support may also be necessarythis is then preferably provided by MSCs governed by the SVC.For temporary over voltages, large inductive r
