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Research of the Low-Voltage Dynamic Voltage Restorer’s Capacity of Compensation

Author: SuHengBo
Tutor: LiaoRuiJin；TangShiYu
School: Chongqing University
Course: Electrical Engineering
Keywords: Dynamic power quality Dynamic Voltage Regulator Voltage drop
CLC: TM423
Type: Master's thesis
Year: 2005
Downloads: 139
Quote: 0
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Abstract


The development of modern science and technology , various electrical equipment such as precision laboratory equipment, aerospace, semiconductor manufacturing and some production automatic control systems, business and communications, computing center, financial , etc. on the power supply reliability and power quality have become increasingly demanding high , even a few tens of milliseconds, the voltage drop will affect the operation of the equipment . According to the statistical power for the power system are mostly time of a few milliseconds to 500 milliseconds and the dynamic voltage drop increases, rather than voltage completely interrupted . According to China 's distribution network structure, low voltage distribution network is a major source of pollution in distribution networks . It was the end of the transmission and distribution network , but also a lot of sensitive user's power supply. Paper by discussing the dynamic voltage regulator DVR (Dynamic Voltage Restorer) means to resolve sensitive or hyper -sensitive load high power requirements . The topics developed 380V/100kVA dynamic voltage regulator prototype main circuit by a DC energy storage unit , a voltage source inverter , filter and series transformer access unit four parts , the use of three single-phase bridge structure, so that the dynamic The voltage regulator can control the phase separation , increasing the control flexibility and functionality . According to the nature of the load , the voltage phase angle to adjust the load , by reducing the DC side voltage , varying the series transformer ratio , reducing storage capacity of the cell so optimized design to reduce the capacity of the compensating device DVR , the DVR to output compensating means maximum compensation voltage reaches 0.5pu, while efficient use of storage capacity , so that the voltage drop in certain circumstances , get longer compensation time . The simulation system failure voltage drop, dynamic voltage regulator to understand 380V/100kVA prototype can meet the design requirements. The device connected in series electrical network to protect sensitive loads from voltage fluctuations , especially the impact of voltage sag , the device can be within milliseconds compensate voltage drops to normal .

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Transformers: the role of performance points > Voltage regulators, adjustable transformer
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