外文翻譯--svc與statcom在電力系統(tǒng)中應(yīng)用的效益

1、中文 3480 字畢業(yè)設(shè)計(jì)外文翻譯 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 2013 年 12 月 28 日2TCR-produced harmonics) are ca

2、pacitive 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

3、 dedicated 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 optimi

4、zed 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

5、 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 three-phase set of output voltages with desired amplitude

6、, 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 ar

7、e used.Inherently, STATCOMs 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 ne

8、ed a complementary reactive power source. This can be realized for example with MSCs.VII. THE FUNCTIONAL RATING CONCEPTTraditionally, SVCs of a common design have been used to handle different types of network problems.

9、 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 load pattern, bulk reactive power co

10、mbined 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 capacito

11、r banks (MSCs) or reactors (MSRs) governed by 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 co

12、ntingency 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 v