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输配电网中运用无功补偿的意义研究

论文作者:www.51lunwen.org论文属性:作业 Assignment登出时间:2014-06-10编辑:lzm点击率:2365

论文字数:1219论文编号:org201406101611405280语种:英语论文 English地区:中国价格:免费论文

关键词:输配电网无功补偿compensation regulatortone regulating transformersgrid voltage adjustment

摘要:Series capacitor compensation may be used for local distribution grid regulator. Heavy lines in long distance, because the role of regulator through the line current flowing through the phase lag generated by the series capacitor voltage rises to achieve.

First, the distribution of the importance of reactive power compensation

Currently set off a worldwide wave of environmental protection, electric power system is a specific environment, appearing in the transmission and distribution network reactive power, power itself is determined by operation of the law, but it gives a lot of trouble grid operation . Reactive power is both can not be active, but it will cause losses in the grid, and it is not a lack of power, so you want to add in the grid reactive power compensation device, while the grid voltage is adjusted achieve power efficiency maximized.

 
Second, the distribution of reactive power compensation? 1 grid reactive power compensation  
Reactive power compensation of the basic principles are: stratified according to the voltage at the grid partition, local equilibrium, avoiding long-range transport of reactive power, so as not to take up the line to increase transmission capacity and power loss. Most no direct supply grid load, generally do not set up for the purpose of regulating reactive power compensation device. Parameters used for longer distances compensated transmission lines. Specific compensation method is as follows:
 
(A) reactor compensation
Reactors are commonly used in EHV transmission lines over long distances compensation device to compensate for transmission line-to-ground capacitance charging power generated to suppress power frequency overvoltage. The capacity of the reactor length and over-voltage limiting circuit level selection, the degree of compensation (reactor capacity and line charging power ratio) to statistics mostly 70-85, the individual is 65, generally not less than 60. Reactor general often set in the line two turbulent, and does not set the circuit breaker.
(2) series capacitor compensation
Series capacitor is used to compensate for transmission line inductance, improving stability play a shortened electrical distance transmission capacity levels and the role of the line. Series capacitor banks, mostly in series or parallel combination of parallel count by the line transmission capacity, depending on the series by the required number of series capacitor compensation degree (series capacitor compensated line capacitance and inductance ratio) be. Series capacitor compensation is generally below 50, not too high, so as not to cause the system to sub-synchronous resonance. Grid impedance caused by uneven due to circulation, the series capacitor can also be used to compensate. Japan 110kV ring on the use of series capacitor compensation.
(3) intermediate synchronous or static compensator
The intermediate transmission line installed in the remote camera or static synchronous compensator compensating means, use of these devices of reactive power regulation, the line absorbs light load line charging power, limit the voltage rise; issued when the line reactive power overload, to compensate for line reactive power loss, support for voltage levels, thereby increasing the transmission capacity of the line. Middle synchronous or static compensator usually located in the midpoint of the line, assuming that the first end of the line, adjust the effect disappeared.
Anchor with the grid voltage regulator and the power transmission grid region's low a voltage grids associated pivot point, often set OLTC or a substantial abilit论文英语论文网提供整理,提供论文代写英语论文代写代写论文代写英语论文代写留学生论文代写英文论文留学生论文代写相关核心关键词搜索。

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