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Study on the Key Technologies of the DC Storage Energy System in DVR

Author: FanYongYu
Tutor: SunHaiShun
School: Huazhong University of Science and Technology
Course: Proceedings of the
Keywords: Voltage drop DC energy storage system Composite Energy Storage Dynamic Voltage Restorer
CLC: TM761.1
Type: Master's thesis
Year: 2011
Downloads: 72
Quote: 0
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Abstract


With the progress of the control technology , computer-controlled load proportion in the national economy is increasingly more sensitive to changes of this type of load voltage and frequency , event such as voltage sags failure prone even load tripping damaged , seriously affected the industrial production , that is commonly referred to as the sensitive load . Dynamic Voltage Restorer (Dynamic Voltage Restorer, DVR) is a method for inhibiting power system voltage drop , protect sensitive load device distribution network fault , increase the energy storage element in the DC side of the DVR , the DVR compensation effect plays a crucial role. In view of this , the DVR DC energy storage system topology , mathematical models and control strategies . Thesis put forward the problems of power quality , as well as measures to deal with such problems , which leads to the suppression of the power system voltage drop dynamic voltage restorer , and the principle of dynamic voltage restorer , composition and characteristics were introduced . DC energy storage unit increase in the DC side of the dynamic voltage restorer able to make its performance has greatly improved , the DC energy storage system key technologies , the principle , the characteristics of the battery and supercapacitor two main energy storage element and equivalent circuit model is introduced . The paper focuses on the the battery DC energy storage system and battery - DC Hybrid supercapacitor energy storage system topology , mathematical model , system stability margin Bode diagram analysis and design of the PI controller , dual closed-loop feedback control to improve system stability , reduce the static error ; feedforward control system is designed together to achieve a composite control and feedback control ; battery DC energy storage system and battery - supercapacitor composite reservoir after simulation in PSCAD / EMTDC platform the system features . Finally DVR battery single storage form of super capacitors and batteries - composite energy storage in the form of a simulation , to verify both inhibit fault voltage drop compared the performance and characteristics of both . The Full Summary late prospect of work on this subject can be further carried out .

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation > Automatically adjusts > Automatic adjustment of voltage and reactive power
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