急求英语高手翻译下文（无功补偿）（10分）

求无功补偿方面的英文文献，有对照中文翻译者为佳~

　　Reactive power compensation and harmonic filtering

　　By Ved Prakash Sinha / Published on Tue, 2007-03-13 15:58

　　Further readingApplication Note: Passive Filters (4225)
　　There is enough evidence available about the reactive power compensation and its benefits for loads having low power factor. Though such loads, which impose only low power factor are increasingly replaced by loads which generate significant harmonics as well. As a result, most of the modern compensators are designed to carry out a dual task for compensation as well as harmonic filtering. And then, there is also a dimension of reaction time which is quite important for certain loads. For example, a welding load which generates high harmonics, has low power factor, can never be properly compensated by a classical passive compensator. It needs a fast acting device like a thyristor switched capacitor bank to match the speed of the load variation.

　　Several solutions for power factor compensation and harmonic filtering are available in the market like conventional automatic banks with contactor switching or fast acting real time banks with thyristor switching and active filters. There is a variety of capacitor banks available which are used to compensate loads which need support in terms of power factor as well as harmonic correction. In a network polluted by harmonics, capacitor banks often use inductors in series with the capacitor steps for safeguarding the capacitors from harmonic overloading and inrush current. Such banks are called “detuned banks”.

　　Specially designed capacitors and inductors make a filter circuit (passive filters) which serves a dual purpose of providing reactive power and filtering of harmonics. Most commonly used passive filters are of fixed type, sometimes automatic switched banks are also provided with steps tuned as passive filers. This however imposes a limitation on the design of such banks. Principally, if there are several steps available, they are required to be tuned at different frequencies. For example, a 200 kvar rated capacitor bank can have 4 steps, each of 50 kvar, tuned to 5th, 7th, 11th and 13th harmonic filter. The immediate requirement of such bank will be to keep the 5th harmonic bank in service first, followed by 7th, 11th and 13th order. This means, any fluctuation on reactive power demand around 200 kvar will be met by switching on/off the last steps (11th & 13th harmonic filter) only. The switch controlling these steps will be overstressed compared to other steps (tuned to 5th & 7th order). It will not be possible to operate these 4 steps in “circular switching” mode or first in first out (FIFO) mode as it will result in dangerous amplification of higher order harmonics. This also means, if there is any problem in the 1st step, tuned to 5th harmonic, none other steps could be switched ON, leading to non-availability of the complete system. Other limitations come from the change in load (like additional of one more drive to the same bus) or network parameter changes (like replacement of feeding line or transformer) which always affect the performance of a passive filter.

　　An automatic bank detuned with a reactor does not impose such limits. For example, a detuned bank using 7% reactor (which results in a tuning point below 4th order harmonic) provides a robust solution to such application. The bank with several steps can all have the same detuning reactor and the bank can operate in first in first out (FIFO) mode ensuring all switches are used evenly. Even if any of these steps are not in service, remaining healthy steps can continue to perform without any danger of amplification.

　　Above concept works well with classical solution (contactor switched banks) or fast acting real time banks. The thyristor switched banks are more apt for loads which changes very fast. Examples are welding machines, drives, compressors and similar applications. Cranes used at harbor, which mainly employ DC drives, need fast reactive compensation as well as harmonic filtering. thyristor switched real time banks with detuning reactors are used for these loads with best result as they provide much needed reactive power and reasonable harmonic filtering with better performance than classical automatic banks with contactor switches. If harmonic pollution is severe (high voltage distortion), the passive devices need special design considerations. Under certain situation, a combination of dedicated power factor compensation device (like a thyristor switched bank) and harmonic filtering device (like an active filter) may produce the best result.

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With the national economic development and improvement of living standards, a large number of residential properties for sale, high-end stores, hotels, office buildings going up in cities such as civil construction, rapid growth of urban consumption. However, in these civil establishments mostly used in single-phase inductive load, because of its low power factor, lag in reactive power grid in a larger proportion. To ensure the reduction in reactive power grid, improve power factor, active power to ensure the full utilization efficiency and improve the system power supply voltage quality, reduce line losses, reduce the cost of distribution lines, save energy,
Usually in the low-voltage power supply system installed capacitor reactive power compensation equipment.
Reactive power compensation, in terms of its concept as early as known, it is by means of reactive power compensation device to provide the necessary reactive power to improve system power factor, reduce energy consumption, improving the power grid voltage quality. Reasonable allocation of reactive power compensation principle, the reactive power from the power consumption of network fundamentals can be seen at all levels of network and transmission and distribution equipment must consume a certain amount of reactive power, especially in the largest proportion of low-voltage distribution network. In order to minimize reactive power transmission losses, improve the efficiency of power transmission and distribution equipment, reactive compensation equipment configuration, should be in accordance with the "classification of compensation, local balance" principle, reasonable layout
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With the national economic development and improvement of living standards, a large number of residential properties for sale, high-end stores, hotels, office buildings going up in cities such as civil construction, rapid growth of urban consumption. However, in these civil establishments mostly used in single-phase inductive load, because of its low power factor, lag in reactive power grid in a larger proportion. To ensure the reduction in reactive power grid, improve power factor, active power to ensure the full utilization efficiency and improve the system power supply voltage quality, reduce line losses, reduce the cost of distribution lines, save energy,
Usually in the low-voltage power supply system installed capacitor reactive power compensation equipment.
Reactive power compensation, in terms of its concept as early as known, it is by means of reactive power compensation device to provide the necessary reactive power to improve system power factor, reduce energy consumption, improving the power grid voltage quality. Reasonable allocation of reactive power compensation principle, the reactive power from the power consumption of network fundamentals can be seen at all levels of network and transmission and distribution equipment must consume a certain amount of reactive power, especially in the largest proportion of low-voltage distribution network. In order to minimize reactive power transmission losses, improve the efficiency of power transmission and distribution equipment, reactive compensation equipment configuration, should be in accordance with the "classification of compensation, local balance" principle, reasonable layout.

你做什么毕业设计题目，我也是关于无功补偿的

国民経済の発展と生活水准、贩売用住宅のプロパティの多数のは、ハイエンドの店、ホテル、オフィスビルは、都市の土木、都市の消费の急速な成长などを开く予定。ただし、これらの民间事业所のほとんどが単相で、その低消费电力率、无効电力グリッドの遅れのために大きな割合に応じて诱导负荷を使用します。无効电力グリッドの削减を确保するため、ラインの损失を、低电圧分布通常のための配电线のコストを、エネルギーを保存すると、削减力率、有効电力を最大限に利用効率を确保するため、システムの电源电圧の品质を向上させる、减らす改善するために电力システム无効电力补偿装置のコンデンサのインストール。
早期として知られて、そのコンセプトの面で无効电力补偿が、それは无効电力补偿装置の手段によって、必要な无効电力システムの力率を改善するため提供するためにエネルギー消费量を减らすために、パワーグリッドの电圧の品质を改善している。无効电力补偿の原则の合理的な配分は、ネットワークの基础の消费电力から无効电力は、ネットワーク、伝送、配电设备のあらゆるレベルで无効电力の一定额を消费する必要があります、低电圧流通ネットワークの最大の割合を中心に见ることができます。ために、无効电力の伝送损失を最小限に抑えるに基づき补偿金の"分类とは、ローカルのバランス"の原则、合理的な流通する必要があります、送电および配电设备、反応补偿机器构成の効率が向上します。

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顺庆区19722782040： 急求英语高手翻译下文(无功补偿)(10分) - ？
箕京异烟： With the national economic development and improvement of living standards, a large number of residential properties for sale, high-end stores, hotels, office buildings going up in cities such as civil construction, rapid growth of urban consumption. ...

顺庆区19722782040： 无功补偿翻译 - ？
箕京异烟： In the power supply system,reactive power compensator has many effects,such as raise power factor, reduce the loss of supply transform and power transmission line,enhance the efficiency an...

顺庆区19722782040： 求无功补偿方面的英文文献,有对照中文翻译者为佳 - ？
箕京异烟： Reactive power compensation and harmonic filtering By Ved Prakash Sinha / Published on Tue, 2007-03-13 15:58 Further readingApplication Note: Passive Filters (4225) There is enough evidence available about the reactive power compensation...

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