Author: iHOGA software

BUILD 2024/03/21

CHANGES IN BUILD 20240321:

  • In NPV maximization projects, added constraint of maximum unexported energy (%). Unexported energy (%) defined as: (Exported_energy-Sold_energy)/Exported_energy*100.
  • In systems without load consumption, added the option to evaluate the performance of a new power generating system to be added to a previous existing PV system (LOAD/AC GRID->PURCHASE/SELL E->”-Ppv” checkbox). For example, if you have a grid-connected PV generator and you want to consider to add some wind turbines.
  • In systems without load consumption, added the option to evaluate the performance of a new power generating system to be added to a previous existing Wind turbines system (LOAD/AC GRID->PURCHASE/SELL E->”-Pwt” checkbox). For example, if you have a grid-connected wind farm and you want to consider to add a PV generator.
  • Added the option to compare with the system without generation, that is, a system where all the load is consumed from the AC grid (LOAD/AC GRID->PURCHASE/SELL E->”-Load cost” checkbox). The cost of supplying all the load by the AC grid (buy price + access price) will be subtracted from the NPC.
  • Added graphs for the visualization of the daily difference between maximum and minimum hourly prices (purchase / sell electricity prices).
  • Added Probability Density Function (PDF) graphs for the hourly purchase / sell electricity prices.
  • Added Probability Density Function (PDF) graphs for the main results of the simulation.
  • Improved calculation of lifeciycle CO2 emissions in multiperiod simulation.
  • Now all the simulation graphs can be copied to clipboard (right button click).
  • Improved vertical axis visualization in some graphs.
  • Fixed minor bugs.

BUILD 2024/03/13

CHANGES IN BUILD 20240313:

  • Added a button to import load consumption tables (a button for each table consumption type: AC, DC, H2)
  • Improved visialization of the simulation and the graphs of renewable sources and load: added grid, scroll options…
  • Added an option to check for updates at the start without asking.
  • Improved speed when calculating projects with water pumping and in multiperiod projects.
  • In multiperiod optimization, if load increase is fixed, the first year load is not increased (it is the defined in the LOAD screen).
  • Changed the checkbox named “(sell price)” to “(comapre with sell price)”.
  • In the simulation graph added visualization of the battery auxiliary load.
  • Fixed bug for maximizing NPV projects, when CAPEX is 0 there was an infinite loop for calculating IRR.
  • Fixed bug when saving a project as the default project.
  • Fixed bug in some cases when using battery Schiffer model with backup generator.
  • Fixed bug in some cases in cycle charging strategy with SOC setpoint.
  • Fixed bug to run the fuel cell if electrolyzer standby power is higher than 0.
  • Fixed bug in optimization of temporary installations.
  • Fixed minor bugs.

Build 2024/01/18

CHANGES IN BUILD 20240118

  • Corrected bug in some cases in simulation of projects with water pump and batteries.
  • Added constraint of maximum unmet load in NPV maximization projects.
  • Added the possibility to consider the generation (transfer) charge for the energy injected to the grid (by default) or for the renewable energy generated.
  • The generation (transfer) charge can be negative, that is, the system would receive money due to the renewable energy generated (in the case there is a state subsidy due to emissions reduction). ​This will be subtracted from the cost of purchasing electricity to the grid.
  • Added the possibility to calculate LCOE in NPV maximizing projects considering the energy sold to the AC grid only (by default) or including the load energy consumed by the system.
  • Improved estimation of computation time.
  • In optimization of energy arbitrage (for batteries, PHS or hydrogen) with two variables, reduced computation time (lower price setpoint can’t be higher than higher setpoint) by default.
  • Fixed minor bugs.

Build 2023/12/26

CHANGES IN BUILD 20231226:

  • Added the selection of months for battery availability under arbitrage.
  • Added the possibility to force to pump using AC grid or to use turbine to inject to AC grid regardless arbitrage, with same selection of hours and months as for batteries.
  • Added in the report the number of starts of turbine, pump, fuel cell and electrolyzer.
  • Added in the Excel of the simulation, for each time step and for the total monthly, the incomes of selling hydrogen.
  • Corrected bug in IRR calculation in some cases when adding extra costs.
  • Improved optimization speed in NPV minimization projects.
  • Added in Extra costs the possibility to introduce a value with a fixed annual inflation.
  • In MHOGA, added maximum land use constraint in minimization of NPC projects.
  • Corrected display errors of some graphs in time steps of less than 1 h
  • Fixed minor bugs.

Build 2023/11/02

Changes in build 20231102:

  • In multi-period simulation, added the possibility to use different electricity sell (and buy) hourly prices for the different years (not just updating with inflation, but using different hourly files for the different years). Two options, import the different electricity hourly prices files for the different years, or generate them.
  • Added the possibility to optimize battery SOCmax (in Li-ion batteries).
  • Corrected problem to visualize worst month method results (in iHOGA low power projects) when opening.
  • Corrected error in some stand-alone projects with diesel always on (creating the grid refference)
  • Corrected error in iHOGA some cases when opening a project after another one is open.

Build 2023/09/03

CHANGES IN BUILD 20230903:

  • Added option for LCOH minimization. Also maximization of capacity factor and minimization of LCOE, with weights. Also maximization of IRR.
  • Added control strategy for grid-connected electrolyzer: run at full load, buying electricity to the grid if necessary; at high electricity price electrolyzer power can be supplied by the battery.
  • Updated wind data downloading from Renewables Ninja.
  • Fixed minor bugs.