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Question

I would like to know if anyone has installed PQ meter within the microgrid and did the same comparison, as noted below, for microgrid transient response...

I have been doing a lot of simulations for microgrid system protection and control and seamless islanding and grid re-synchronization and trying to compare these simulations to the actual measurements from the live microgrid. I am using some Relaying recorded data, synchophasor data and some PQ meter data (1024 samples per cycle). I would like to know if anyone has installed PQ meter within the microgrid, and did the same comparison for microgrid transient response for voltage, frequency, and rate of change of frequency and did simulation match the field response? We are now installing a PQ meter that can measure 1,000,000 points per cycle (it’s actually a relay) to really see what happens during the transition to island and grid re-synchronization, since this is probably the most challenging part of the microgrid design from the standpoint of 27/57/81/81RF torque-controlled protective elements. One thing I learned is that after 6,500 transitions to island and back to the grid in less than two years of testing, there is a whole lot more that we don’t know and even a whole lot more to learn...

Answers

Aleksander, I have no personal experience installing Power Quality (PQ) meters in microgrids, however I was involved in a project to install PMU's across New England. The only area that comes to mind, that may offer you some insights  is the North American SunchroPhasor Initiative (NASPI). They've recently published a paper on data mining PMU data, that may give you some useful insights, or at the very least, access to the team members that wrote this report - perhaps they can assist you further.

Aleksandar Vukojevic's picture
Aleksandar Vukojevic on February 18, 2019

Thanks for the answer. I actually have PMU installed inside the microgrid and it gives me data but once per cycle which is not enough. I also have synchophasor based islanding detection scheme...

Aleksandar,  I do not have the specific experience you are looking for, but you might want to contact Erik Limpaecher at the MIT Lincoln Labs.  They are very involved in simulation, but may know of others who are doing validation of the simulations.  Here's a short video on a Microgrid Controller symposium from 2017 which may be helpful.  

Aleksandar Vukojevic's picture
Aleksandar Vukojevic on February 18, 2019

Thanks you for the help. Most of software is based on steady state and getting transients to match the field response is challenging...

Hi Aleksander, Personally I did not any studies on microgrids with PQ meters, but I had a number of discussions doing frequency measurements especially when it comes to RoCoF issues. When you have issues in your network, based on a fault in the grid, with loss of lines/generation, its quite difficult to define the sampling time, as during fault conditions phase jumps are heavily influencing the measured value. Thats the reason via European TSO´s such as Eirgrid and National Grid in UK define a measuring time between 300 - 500 ms to filter out variations and noise. Especially when they want good results to handle the RoCoF.  I had also some discussions with utilities which believed in Energy Storage solutions based on batteries to handle all frequency issues. Unfortunately, you have to measure the frequency to be able to counteract frequency drop. I would say that this is the major advantage of synchronous solutions(syn.generators or SynCon´s) versa BESS. Synchronous solutions are instantaneous. If you need the documents from Eirgrid & National Grid, I can try to find these and send it to you. christian.payerl@se.abb.com

Aleksandar Vukojevic's picture
Aleksandar Vukojevic on February 18, 2019

Christian...thanks for the response. We actually have ABB inverter on battery system. Our microgrid works great and I’m looking to see if I can improve simulations vs. field response transient analysis. I got PMUs I had PQ meter and now I have this new meter that captures 1,000,000 samples per cycle. Seamless islanding that we have implemented is working great but simulation vs field response for transient analysis needs more work b

For those who are following this topic, I thought I would share some email responses in case you are interested as well: 

From: Cudney, Chris L <CCudney@ameren.com>

 

Contact Alex Rojas – arojas@ameren.com

 

From: Dreiling Daniel W <Daniel.Dreiling@srpnet.com>

We haven’t done a lot of work on the Microgrid, and don’t have feedback. I would suggest you reach out to Southern Co and some of the work they are going at Georgia Power. Don’t have a name handy.

From: mohammad albaijat <mohammad.albaijat@gmail.com>

Check with NYISO. 

From: Chris Marnay <chrismarnay@lbl.gov>

 I suggest you try Alex McEachern <Alex@PowerStandards.com>

From: Alexi Miller <alexi@newbuildings.org>

I don’t directly know the answer or who is the right person, as this is the side of microgrids that we know something about but haven’t been involved in specific modeling along these lines. I bet someone from the GridOptimal Buildings Initiative has been involved with this topic, though. Perhaps Aleksandar would be interested in a conversation about that collaborative effort. He’s welcome to reach out to me directly. An overview of the GridOptimal Buildings Initiative can be found here:

https://newbuildings.org/gridoptimal-initiative/

We in our utility are doing our first pilot project on MicroGrids and yet to explore PQ Metering issues. I know many others have also provided you some relevant contacts. I would like to add that people from OATI are also involved in many MicroGrid projects and you can contact Farrokh at his email as  below for assistance: farrokh.rahimi@oati.net. I am here at ISGT this week and i have met Farrokh today afternoon. I will check with him if he has some inputs.

Thanks

Satish Saini

Aleksandar Vukojevic's picture
Aleksandar Vukojevic on February 18, 2019

Satish

thanks for email. I will reach out. Good luck with microgrid effort. 

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