Modelling a simple grid storage

[robbie.morrison]

I take it you saw this recent thread on negative prices:

Avoidance of circular flows caused by negative grid costs

Hi everyone, I’m working on a local energy system model that includes a grid connection, photovoltaic (PV) panels, residential demand, EVs, and a battery storage, using oemof solph v0.5.2. The components are connected to a system core which is defined by a AC and DC bus connected by two converters (AC/DC and DC/AC). As bidirectional flows are modeled by two unidirectional flows I run into the following problem: Negative energy costs from the grid force the optimizer to buy as much energy as …