外文文獻(xiàn)翻譯---單相ac- ac變換器補(bǔ)償電壓驟降和驟升

1、外 文 文 獻(xiàn) 翻 譯專(zhuān)業(yè) 專(zhuān)業(yè) 電氣工程及其自動(dòng)化學(xué)生姓名 學(xué)生姓名 陳嘉俐班級(jí) 班級(jí) BD 電氣 071學(xué)號(hào) 學(xué)號(hào) 0720601103指導(dǎo)教師 指導(dǎo)教師 胡國(guó)文電氣工程學(xué)院 電氣工程學(xué)院capable to compensate voltage sags and swells. Nevertheless, they depend on devices to store energy, like large capacitors o

2、r batteries bank. The nominal power operation is a function of size and capacity of those devices; if the power is increased, the size of the devices will increase. In spite of the above, the UPS systems are capable to s

3、upport energy interruptions.Other option developed, which is able to compensate voltage sags is based on PWM AC-AC converter[3],[4].This solution uses an autotransformer composed by one primary side and two secondary win

4、dings presenting a good performance. The system compensates until 50% voltage sags and swells and can continuously shape the output voltage to be sinusoidal (with low THD). Nevertheless, the autotransformer drives all th

5、e load power due to it is connected between the load and the AC mains.In this paper a PWM AC-AC converter is presented, in order to compensate voltage sags and swells simultaneously in critical loads, and to maintain a c

6、ontinuous regulation in the output voltage. The system consists in a single-phase AC-AC converter in a matrix arrangement, and energy storage devices are not required. A four step switching technique is used to drive AC-

7、AC converter switches, executing snubber-less operations. The reference signal is generated using single-phase d-q theory, obtaining a fast response time and continue regulation, with a high efficiency.One of the advan

8、tages in this structure is that the taps of the coupling transformer are not required to change the polarity of the compensation voltage, and the converter drives only a percent of the load power.Design, construction and

9、 performance are detailed, and several simulations and experimental results obtained with a laboratory prototype are showed to validate the approach.II.CONVERTER ANALYSISThe structure of the proposed approach is shown i