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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 " O7 F/ _/ ~: K j+ {: [' C2 ]
, y) m% s' `; \1 W/ i6 `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：+ G7 q5 y2 X6 k: @5 ~6 ~3 G
/ O. L8 k8 n. J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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6 }/ A" f! F* [' e( aumec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！
& s1 u' C& h/ d0 G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!& H. D: X5 v1 X2 R- ~5 n |' ~) H
原文链接：https://tech.cepsc.com/thread-87732-1-1.html9 i" v, J& f! U2 x
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问题原文Dear Sir/Madam:' z. R: q/ j, P+ L) y
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l) l: F" l/ Q, r6 ~1 x1 dI'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.6 d. r$ T8 [% Q9 c5 I! z' y
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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?
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L) q6 n6 y4 l. }% IFor 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. / O' z( d2 O. v6 ~/ m
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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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6 s# P* `: t: U/ \' D$ p7 F' \9 FFigure 1. No-load test simulation circuit8 v5 ] h+ C6 Z% K: O1 s
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: o4 \. ~6 ~3 a; q0 A1 D- VFigure 2. The default setting of the 1-phase 2-winding UMEC transformer9 X8 O2 j7 v+ T8 w2 J+ N: ~: F/ J
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Tabel 1. The comperation of measured value and set value of saturation curve# X1 y- E; {& C: m# `; l6 `
| 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.1 \6 w7 v9 H- b
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Best regards- Y% \. L- f1 v6 k; X) V8 N8 z
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& L: X7 h' b2 N0 }8 i3 v$ qYours,
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Xie Qijia/ M4 F' I8 I2 b. Q8 G4 C1 ]
Email: xeqja@163.com: ^& ^. [/ |& N3 i2 @! I o$ g
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问题全文' L2 Q9 z+ s: P: S5 M" \- R
UMEC问题.rar
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