Export Limitation in Simulation

[eka]

Hello ;

We’re planing to use OpenEMS for a microgrid project in our university.
It involves with PV system, Battery Storage System, Utility Import/Export.

Before we invest in HW and Infrastructure. We tried to simulate our system and we followed example in OpenEMS ‘ s Doc and community . All of it work fine.
https://openems.github.io/openems.io/openems/latest/gettingstarted.html

Trying to simulate PV Production

Hi Daniel, sorry for the late reply… I was sick with Covid. This was indeed a bug. It is fixed with UI bugfix `isProducer()` method by sfeilmeier · Pull Request #1770 · OpenEMS/openems · GitHub. Thanks for pointing it out. To extend the simulation with PV production, I recommend the following steps. They replace the Grid-Meter with a Production and a Consumption-Meter; just like in a real system, the Grid power then gets calculated from ESS charge/discharge, PV production and consumption. D…

BTW, Grid code in our country has rule that limits the overall power exported into the grid. So I was wondering that

1. how can I simulate system with Export limitation
2. how can I simulate system with zero export function

I’d appreciate any help. Thanks for your time.

[stefan.feilmeier]

Hi Eka,

great to hear about your project. Please keep us updated as you progress. If you plan to publish a scientific paper, please quote us via our Zenodo ID: GitHub - OpenEMS/openems: OpenEMS - Open Source Energy Management System

@eka

BTW, Grid code in our country has rule that limits the overall power exported into the grid. So I was wondering that

1. how can I simulate system with Export limitation
2. how can I simulate system with zero export function

In which country do you live?

The ‘grid meter’ is of course not controlled, so to restrict the feed-in/grid-export power, you have to control any of the controllable devices, e.g.

• the energy storage system (https://github.com/OpenEMS/openems/tree/develop/io.openems.edge.controller.ess.selltogridlimit or https://github.com/OpenEMS/openems/tree/develop/io.openems.edge.controller.ess.gridoptimizedcharge)
• the PV inverter (https://github.com/OpenEMS/openems/tree/develop/io.openems.edge.controller.pvinverter.selltogridlimit)
• the loads - by actively enabling consumption (e.g. https://github.com/OpenEMS/openems/tree/develop/io.openems.edge.controller.io.heatingelement)

Regards,
Stefan

[eka]

Hello Stefan,

Thank you for information.
We are Smart Grid Unit team in university in Thailand.
We are looking for some opensource for EMS to implement in our university and we found OpenEMS is very interesting. So we decided to learn more in detail about this project.

for our question, we plan to use PV inverter as a control devices.
But we cannot find any example that explain how to using PV inverter as a export limitation device in simulation mode.

So, could you guide our team more in detail about how to implement it in openems.

I’d appreciate any help. Thanks for your time.