CIM Issues » WG13 Issues

Current PowerElectronicsConnection assumes a single point point of common coupling (PCC) between inverter and grid model.

Issue 1: PV farms are often modeling on grid side by a single equivalent injection, but are composed of multiple strings of inverters that are connected together on AC side. Controls and AssetInfo descriptions need to be applied at individual inverter model for studying volt-var, etc injections into the grid. Need a method to provide equivalencing of output for SSH profile that also provides granular level of detail need for controls modeling.

Issue 2: Most distribution power flow solvers are unable to handle one inverter with multiple DC sources. If the physical equipment contains one inverter with PV + battery + wind on shared DC bus, OpenDSS and other tools will create three inverters with three terminals injecting into the same node. Unclear if this needs to be expressed in CIM, or if this is strictly a model conversion issue.