Control Logix for Turbine Close loop control

munzii

Member
Join Date
Jul 2007
Location
indonesia
Posts
13
Dear All,

Anyone have experienced use Control logix to control Steam Turbine generator? As the time response for the governor should be less than 20 ms. I will use Control Logix for 25 MW Steam Turbine Generator but have to ensure the CLX can do it.

Thanks,
Munzii
 
The answer is yes. The 1407-CGCM module is specifically designed for high speed generator and turbine control.

See here: Generator Control Module

1. It connects to ControlLogix via ControlNet. You will find a pre-defined module type for the 1407-CGCM in the RSLogix IO Module list.

2. Do not expect your local distributor to know much about this rather specialised module. However the manual is very comprehensive and if you are familiar with generator control and synchronisation, then you should have every chance of getting one to go.
 
I don't believe this is what munzii is requesting. He is looking for turbine control, not generator control. But, if he is doing one, he should look at the other as well.


Still, consult your local Rockwell rep. He/she should be able to assist - if not, then point you in the right direction.
 
Yuu're right oakley, I need the turbine control, I will divide it in 4 nodes with 1 processor.Node 1 = Closed loop control node 2 Turbine protection node 3 Open loop control and node 4 for Generator protection.
But in closed loop will control the turbine speed with 8400 rpm maximum.
I need to ensure the CLX processor can do the PID controller... Not too fast and not too slow.

Thanks.
Munzii
 
Hello Munzii;

If this is the way you want to do it, you can create a New Task in the Controllogix program, set it as Periodic, input a period of 20ms for example, determine the lowest priority number (1 =highest priority, 10= lowest priority, for example the priority generally attributed to your Main Task), and write in an adequate value for the Watchdog Timer for that task.
Now in that task program the PID routine you want to execute at a fixed, rapid scan time. If you make the program compact enough so it will not overrun your Watchdog, it will be executed at the precise interval you have setup for the task.
Hope this helps,
Daniel Chartier
 
Thanks Dchartier,

Its a great idea, does amount of the tags will affect the scan also? I use around 300 I/O's but i will separate it in 4 nodes via ControlNet Communication and off course the IO's for the speed control I will put in local chassis.

regards,
IM
 
In addition, you should check with the turbine manufacturer. They may not warrant any equipment if the control system is not "theirs" or supported by them. There will be a lot of finger pointing - may not be worth the effort.
 

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