PSCAD高手必看的啊？who kown？

xuyufufzu · 发表于 2008-4-6 14:14:59

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呵呵，大家用的最多的是三相电源模块的啊，你知道从0点开始仿真的话，pscad计算出来的，三相电源的起点的电压是多少么？测量模块，测量为3维变量，变量1是啊a相，还是C相，哈哈。高手必看！
哈哈

xuyufufzu · 发表于 2008-4-6 14:20:08

^_^，我自己知道

hrms · 发表于 2008-4-6 14:34:25

变态！
知道就说，炫耀啥？

xuyufufzu · 发表于 2008-4-7 12:45:15

可以交流一下的啊，我的QQ 37478797 我有很多心得，PSCAD 怎么说的呢，我上面发表的话题，只不过，想和大家交流一下，体会！就算告诉你了，你不使用PSCAD，告诉你也没有用！

yizhangsjtu · 发表于 2008-4-9 02:18:05

The PSCAD/EMTDC uses a zero starting initialization approach. The start point of voltage source is 0.
In EMTDC, the RMS meter ( I assume you are talk about the RMS, fr only this one has 3 input) in fact is not in a RMS algorithm. It uses the phasor to be RMS measurement. Therefore, as long as you use the right phase sequences ( like abc, bca or cab), the results will be the same. Please notice, the phasor magnitude is only meaningful for RMS in steady state. Other that, the RMS meter is not correct.

There are lots a wise individuals all around. So young guys, be nice and be fun...

xuyufufzu · 发表于 2008-4-9 10:36:56

但是，三相电源的话，怎么从0点开始的话，只有一项是0 ，另外的两项并不满足sin（wt＋－2×pi/3），我很纳闷的啊，从第2点，开始的话，又满足的啊！
为什么EMTDC，会这样的啊！

yizhangsjtu · 发表于 2008-4-10 12:02:55

Well, there are several source models in EMTDC/PSCAD, all ramping from 0.
There is a ramping time you can choose. The ramping pattern can be linear, exponential or other...
for instance, linear...
Va=Vm*t*sinwt
Vb=Vm*t*sin(wt-120)
Va=Vm*t*sin(wt+120)

when t=0, va=0, vb=0 and Vc=0 np problem.
t can be normalized so that the magnitude can be ramp to the Vm in certain time, then stays there.

There is no problem to implement this.

Anyway, focusing on such small detail won't help you understand the simulation.

If you are really interested in EMTDC, please read the manual carefully, and you should also read EMTP theory book and take power system analysis courses in university.

Those programming tip/detail is no that important, but sometime fun...

Help the above helps.

xuyufufzu · 发表于 2008-4-10 12:20:37

但是我用的，初始化的时间为t＝0.也就是，从0开始就是为稳态的啊，并不会让电源模块就过渡时间的啊！不过影响还是不大，从第二点就已经符合上面的表达式规律。
请问，您知道，PSCAD里面的录波器为什么不能录数字量么？我只能录取一路，第二路就开始出错，你能告诉我，数字通道录取的数字格式是什么？整数？实数，逻辑？

yizhangsjtu · 发表于 2008-4-10 12:34:50

Sorry I am not using QQ.

xuyufufzu · 发表于 2008-4-10 12:44:11

不知道，能否回答我刚才的问题的啊，录波器中数字通道怎么不能用的啊？录的数字格式是什么？

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PSCAD高手必看的啊？who kown？

马上加入，结交更多好友，共享更多资料，让你轻松玩转电力研学社区！

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晕倒

上面说得，有些对

谢谢楼上

呵呵，不过还是谢谢你