Author: iHOGA software

Build 2023/03/29

  • Added auxiliary load consumption for the batteries (cooling, heating, BMS..,) as a percentage of the maximum power (Pamx=Imax·Vnom) of the battery.
  • Added the possibility to set the maximum SOC for li-ion batteries.
  • Added water cost for the hydrogen generation (this cost will be increased during the years with general inflation).
  • Added value of purchase electricity price below which the storage/generator will have priority to supply the load (instead of the AC grid).
  • Corrected bugs related to systems with hydrogen load consumption.

Build 2023/01/22

CHANGES IN BUILD 20230122:

  • Added the possibility to inject power to the AC grid from the fossil fuel generator (AC generator) in NPV maximizing systems (in generating systems which sell electricity to the grid).
  • Added C-rate for grid-connected battery charge / discharge.

PREVIOUS CHANGES:

CHANGES IN BUILD 20221223:

  • Fixed minor bugs
  • Added minimum capacity of the water tank or reservoir to allow the use of the turbine in PHS systems.
  • The user can define if PV AC coupled inverter can limit the AC output power of the PV to the inverter rated power. If not limited, as in previous versions, we assume the inverter can be overcharged.
  • Capacity factor when PV is AC coupled uses AC output power of the inverter instead DC PV power.

CHANGES IN BUILD 20221210:

  • Added possibility to use electricity sell price inflation instead of general inflation in calculation of LCOE in maximizing NPV projects.
  • Fixed minor bugs (bifacial PV, CPV, electrolyzer, fuel cell).

CHANGES IN BUILD 20221201:

  • Fixed minor bugs.

New version 3.4

New version 3.4 published in November 22, 2022. News:

  • Added the possibility to consider wake effect in wind turbines.
  • Added the availability (hourly and monthly) for electrolyzer and for fuel cell.
  • Added variable efficiency for the water pump (for PHS and for water supply).
  • Choose power limit for priority to use surplus Energy in pump or in batteries
  • In Excel file obtained in simulation, added column of efficiency of turbine, efficiency of pump and efficiency of electrolyzer (% of HHV).
  • Improved visual effects in graphs, adding checkbox for the different series.
  • In load window the graph includes the water load (in energy pumped) and shows the total average daily energy for each month.
  • In iHOGA high power projects and in MHOGA, added the possibility to connect PV generator and wind turbines to the DC bus.
  • Extended download irradiation/wind/temperature hourly data from PVGIS for all around the world.
  • Changed maximum current in li-ion batteries databases to C/2.
  • Corrected problem with full equivalent cycles model of li-ion batteries when including calendar ageing for cases of very low discharge current.
  • Corrected bugs in some cases with PHS storage.
  • Corrected bugs when showing unmet load in multi-objective optimization.
  • Fixed minor bugs.

    • New version 3.3

    New version 3.3 published in September 29th, 2022. News:

  • Added a new li-ion LiFePo4 battery degradation model (Naumann et al., 2020).
  • MHOGA: In maximization of the net present value (NPV) projects, added the constraint of the minimum renewable capacity factor (sold energy divided by peak power of the renewables multiplied by 8760 h).
  • MHOGA: In maximization of the net present value (NPV) projects, added the constraint of the maximum land use.
  • In maximization of the net present value (NPV) projects, added the the result of the renewable capacity factor (sold energy divided by peak power of the renewables multiplied by 8760 h).
  • MHOGA: In maximization of the net present value (NPV) projects, added the result of the land use.
  • In maximization of the net present value (NPV) projects, when a solution does not meet all the constraints, it is assigned an NPV of –infinite (before it was assigned 0).
  • Added the number of cycles to failure for 100% DOD of the batteries.
  • Fixed bugs

    • New version 3.2

    New version 3.2 published in April 2nd, 2022. News:
    Added calculation of direct irradiance when downloading data from databases.
    Added graph of direct irradiance.
    Added possibility to consider Concentrating PV (CPV) modules or generators.
    Corrected bugs when downloading NASA hourly data.
    Corrected bugs of multi-objective optimization (when using unmet load as objective).
    Corrected bug when calculating back surface irradiation if solar tracking (one or two axis) was selected.
    Corrected minor bugs.