A
Hello,
I am an E&I engineer at FFC, a fertilizers plant.
Our power generation system is based upon two 8 MW steam turbine driven generators and one 15 MW gas turbine driven generator. The gas turbine has digital synchronizer and load control (proprietary of Turbomach) and is operating in isochronous mode. It supplies a load of 10 MW under normal conditions. The STG's operate on droop mode and share a load of 7-8 MW equally.
Now according to my understanding every time there is a increase or decrease in system load the iso machine picks the load and drops it on to the droop machine. However due to lag in droop response we suffer frequency and voltage drops in our system. This is obviously unacceptable (though I would like that you point out why).
Now we are currently installing an electronic governor (woodward) to replace the hydraulic one on one of the steam turbines. We will use a DSLC2 module for digital synchronizing and load control. Now I have a number of questions regarding the possibilities of operating modes in which we can run our machines.
1. Is it possible to operate two machines (GT and STG with new system) in ISO mode while the other STG runs in droop mode?
2. Should we install the same system on the second STG too? can we implement Isochronous load sharing on the three machines? If so , then how?
There is an MSLC2 module that is a master module for communicating b/w the DSLC2 for load sharing purpose. From what I understand the three machines will communicate the loads to the master controller via DSLC2's. We would have set the percentage of load we want each generator to pick in order maintain the frequency. The master controller will control all the governors' output to control the speed until the bias signals to each governor is equalized.
3. If we are able to successfully install isochronous load sharing on the three gens then how will this scheme be better then our current scheme of iso-droop-droop?
These were some of my queries. I want to thank you in advance. I know it is long but I wanted to explain as much as possible so there was no confusion.
I am an E&I engineer at FFC, a fertilizers plant.
Our power generation system is based upon two 8 MW steam turbine driven generators and one 15 MW gas turbine driven generator. The gas turbine has digital synchronizer and load control (proprietary of Turbomach) and is operating in isochronous mode. It supplies a load of 10 MW under normal conditions. The STG's operate on droop mode and share a load of 7-8 MW equally.
Now according to my understanding every time there is a increase or decrease in system load the iso machine picks the load and drops it on to the droop machine. However due to lag in droop response we suffer frequency and voltage drops in our system. This is obviously unacceptable (though I would like that you point out why).
Now we are currently installing an electronic governor (woodward) to replace the hydraulic one on one of the steam turbines. We will use a DSLC2 module for digital synchronizing and load control. Now I have a number of questions regarding the possibilities of operating modes in which we can run our machines.
1. Is it possible to operate two machines (GT and STG with new system) in ISO mode while the other STG runs in droop mode?
2. Should we install the same system on the second STG too? can we implement Isochronous load sharing on the three machines? If so , then how?
There is an MSLC2 module that is a master module for communicating b/w the DSLC2 for load sharing purpose. From what I understand the three machines will communicate the loads to the master controller via DSLC2's. We would have set the percentage of load we want each generator to pick in order maintain the frequency. The master controller will control all the governors' output to control the speed until the bias signals to each governor is equalized.
3. If we are able to successfully install isochronous load sharing on the three gens then how will this scheme be better then our current scheme of iso-droop-droop?
These were some of my queries. I want to thank you in advance. I know it is long but I wanted to explain as much as possible so there was no confusion.