外文翻譯--svc與statcom在電力系統(tǒng)中應(yīng)用的效益(存儲版)
【正文】 leted and it is reasonable to believe that transmission applications, benefiting from traction and drive developments, will follow. Although the semiconductor volumes in these fields are relatively small, there is potential for the cost of STATCOMs to e down. Apart from the losses, the life cycle cost for STATCOM and SVCs will be driven by the efforts required for operation and maintenance. Both technologies can be considered maintenance free—only 1–2 mandays of maintenance with a minimum of equipment is expected as an annual average. The maintenance is primarily needed for auxiliary systems such as the converter cooling and building systems. In all, the difference in the cost for these efforts, when paring STATCOM and SVC, will be negligible. XI. LOSSES The primary losses in SVCs are in the ―stepdown‖ transformers, the thyristor controlled air core reactors and the thyristor valves. For STATCOMs the losses in the converter bridges dominate. For both technologies the longterm losses will depend on the specific operation of each installation. The evaluation of investments in transmission has also increasingly included the costs during the entire life cycle, not only the initial investment. Losses will then be increasingly important. With a typical evaluation at $3000/kW (based on 30 years), and additional average evaluated losses of say 300 kW (pared to an SVC), the additional burden on the STATCOM is significant. The evaluated losses at full output will contribute significantly to this, but with less weight on these the difference will be much smaller. Here the evolution does not help the STATCOM as its adequate performance is assumed to be achieved with high frequency PWM, implying that the losses will be quite high even at small reactive power output. We expect most utilities to operate their facilities close to zero Mvar output, in order to have SVCs or STATCOMs available for dynamic voltage support. In these cases both technologies will operate with well below % losses (based on ―stepdown‖ transformer rating). However the losses will typically increase quite rapidly should the operating point be offset from zero. This is valid for both SVCs and STATCOMs. SVCs will frequently operate with both switched capacitors and controlled reactors at the same time, while converter losses of STATCOMs will increase rapidly with output current. The losses of STATCOMs at rated output will be higher than for parable SVCs. XII. CONCLUSIONS 6 We have examined the performance of SVCs and STATCOMs in electric power systems. Based on the analytical and simulation studies, the impact of SVCs and STATCOMs on the studied power system is presented. It was shown that both devices significantly improve the transient voltage behavior of power systems. Though SVCs and STATCOMs work on different principles, their impact on increasing power system transmission capacity can be parable. Specifically, we describe ― enhanced‖ SVCs with voltage recovery performance similar to STATCOMs. Other issues such as losses, footprint, harmonics, etc., must be examined for each scenario for an optimum investment. 7 SVC與 STATCOM在 電力系統(tǒng)中應(yīng)用 的效益 摘要： 提出了 對電力系統(tǒng)中 SVC 和 STATCOM 的性能檢測 。 本文是基于分析和仿真分析 的 結(jié)論可以作為電力行業(yè)指導(dǎo)方針。 從近期 安裝大量 SVC和 STATCOM的項目在世界各地 取得的 經(jīng)驗促使我們澄清這些 設(shè)備 的某些方面。 SVC 的評級可以優(yōu)化 ,以滿足所需的需求。這可以實現(xiàn)，例如用 MSC。 如果任務(wù)是支持系統(tǒng)故障后的電壓不穩(wěn)或不可接受的電壓水平的有限 ，大量快速可控的無功功率是需要 一個短的持續(xù)時間 。它可以在 SVC 的其他部分沒有引入額外的成本增加。 在大多數(shù)情況下，各晶閘管設(shè)置的限制。電網(wǎng)電壓諧波失真的發(fā)生是 STATCOM相阻抗與網(wǎng)絡(luò)之間的阻抗分壓的結(jié)果。該諧波隨頻率的增加產(chǎn)生衰減。 當(dāng)比較 SVC 與 STATCOM， 這種假設(shè)很容易讓人認(rèn)為后者將適合在一個更小的空間， 為被動反應(yīng)元件（空芯電抗器及高壓電容器）是 ‖代替 ―半導(dǎo)體組件。 在 SVC的情況下 , 該行業(yè)有一個長 久 的產(chǎn)品開發(fā)，必要時，已采取措施來縮小安裝。在其他行業(yè)使用的高功率半導(dǎo)體器件，如電力牽引和驅(qū)動器，長期以來主流過渡到 VSC 技術(shù)的完成，我們有理由
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