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发表于 2013-3-12 16:16:30
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本帖最后由 xeqja 于 2013-3-12 16:25 编辑
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支持楼主，但是我下载后解压出错，不能用啊。楼主好心可不可以发邮件给我：xeqja@163.com，另外我有一个问题，在论坛上问了好久没有人回答，问到客服，很悲催地被要求提供软件授权号，你懂的，在天朝国度里像我这样的小白只能用一用石皮解，哪里有授权号，楼主可否顺便帮我把问题给回答了：
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( K* _; n4 R. G; Q1 S9 m4 L请教大侠们，我在做pscad变压器仿真时遇到一个问题很不懂：
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umec模型中考虑饱和情况下，设置的U-I曲线与仿真结果总对不上，例如我把一个系统默认的umec变压器模型来做空载试验模拟，模拟的电源用理想电源，依次施加不同的电压测量其空载电流，仿真测量的U-I曲线与Saturation Curve设置窗口中对应标幺值换算的U-I曲线差别很大，这是为什么呢？应该是一样的才对啊！
( Z7 ?+ ^+ Q) r* R* n `9 W原文标题：pscad中变压器模型问题 - PSCAD - 电力研学论坛 专注电力技术应用，关注电力科技前沿，打造专业电力社区！ - Powered by Discuz!
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; G* ]" x# ]. @问题原文Dear Sir/Madam:! h0 w3 ^% l9 C# A6 b" R
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I'm a beginer of the PSCAD software (version 4.2.1) , and I have a question about UMEC transformer model during learning. Would you please help me? I will be very grateful to you if you give me an answer or give me some clews.
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The question is about the UMEC transformer model in PSCAD 4.2. For the UMEC transformer, why is the measured no-load current not equal to the set value in saturation curve?8 j5 D3 ?: M6 b1 G( K2 X. \
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$ l0 V) U" [; f9 L/ ^For example, the transformer illustrated in the following circuit(Figure 1) is a model from the Master Library without any change, its rated power is 100MVA, and its rated voltage is 230kV(Figure 2). According to the saturation curve, its no-load current should be I0=100MVA/230kV*2%=8.7A, but in the no-load test simulation (In Figure 1. a ideal power supply is used), the measured no-load current is 2.61655A, which is quite different from the set value.
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The whole Saturation Curve is simulated as well. The comperation of measured value and set value of saturation curve is shown in Tabel 1 and Figure 3.
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/ ?' U4 _- {" j& S' y% ]Figure 1. No-load test simulation circuit* V4 C g# k1 ~" @; |
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" i9 p) J# \/ K" S8 G, G2 I7 K7 ~" z3 wFigure 2. The default setting of the 1-phase 2-winding UMEC transformer
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* y3 H4 t6 C3 ~1 N1 H A2 q: {, fTabel 1. The comperation of measured value and set value of saturation curve
; {2 M/ d: h. m8 L4 V| Voltage(kV) | Set Value(A) | Measured Value(A) | | 0 | 0 | 0 | | 74.54967 | 0.771304348 | 0.544998 | | 140.9532 | 2.12016087 | 1.17589 | | 189.77714 | 4.264591304 | 1.83184 | | 230 | 8.695652174 | 2.61655 | | 248.4552 | 13.4583913 | 3.09144 | | 269.8682 | 28.36295652 | 3.67383 | | 290.0645 | 88.50869565 | 4.58593 | | 313.0162 | 261.8043478 | 5.91406 | | 343.7787 | 540.8173913 | 8.46123 |
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Figure 3. The comperation of measured value and set value of saturation curve
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I wish I have discribed the question clearly, and look forward to your feedback.( o) B. l5 T# X) s. i& @: S
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Best regards5 r& M8 ^1 _" o" t2 \9 O
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Yours,
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Email: xeqja@163.com
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( \( W1 J* y+ [ y9 g2 c' [问题全文
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UMEC问题.rar
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