Daksha B Posted August 25 Share Posted August 25 Could someone help me with why my simulation results look like this? I have never seen the HV xfmr loss > MV xfmr loss. My inputs are - MV xfmr loss = 0.87% + 0.13% HV xfmr loss = 0.45% + 0.05% Could it have something to do with weather file/weather at the site location? Link to comment Share on other sites More sharing options...
André Mermoud Posted August 27 Share Posted August 27 IIn PVsyst, the transformer losses are defined as a sum of - the ohmic losses, proportional to the square of the current or power, calculated at each hour of the simulation. The annual ohmic loss value is not identical to the specified loss fraction, which is specific to a reference power. See the help "Project design > Array and system losses > AC ohmic loss from inverter to injection point". - the iron loss, a fixed constant loss, permanent as soon as the transformer is connected to the grid. This may give a high contribution as it is permanent and doesn't depend on the PV production. See the help "Project design > Array and system losses > External transformer losses" Link to comment Share on other sites More sharing options...
dtarin Posted August 28 Share Posted August 28 In PVsyst, the inputs for HV transformer are in MVA. Ensure that the percentages shown match what you have there. PVsyst should then calculate correctly. Your MV waterfall loss looks appropriate for the inputs. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now