# Hybrid & Battery Technology

College of Engineering Technology
ECET- Hybrid & Battery Technology
Problem Statement
For a hybrid system consists of a 400 kW Wind with 50 meter hub height, 20 kW PV array with 24 kWh/year Battery system, and a 220 kVA Diesel Generator.  Find the optimum combination of these sources of energy given the following constraints. Diesel generator operates 742 hours per year and the fixed cost of diesel generator operation is \$86/Hour. The cost of energy from grid is \$0.47/kWh. The grid buys back the power from your design at \$0.25/kWh. The monthly wind speed and solar (clearness index and daily radiation) is shown in Table 1.
Table 1: Wind and Solar Resource

Month             Wind Speed (m/s)      Clearness Index         Daily Radiation (kWh/m2/d)
January                        7.503                           0.481                           3.929
February                      7.521                           0.519                           4.681
March                          7.043                           0.522                           5.192
April                            6.518                           0.518                           5.472
May                             6.474                          0.504                           5.402
June                             5.490                           0.482                           5.144
July                              4.923                           0.500                           5.333
August                        5.001                          0.499                           5.266
September                   4.945                           0.488                           4.932
October                       4.867                           0.493                           4.563
November                   6.903                           0.486                           4.045
December                    7.432                           0.506                           3.977
Average                       6.218                           0.500                           4.828

Wind turbine cost is about \$1.70/W
Solar Panel Cost including battery system is \$3/W

Renewable Energy Certificates (RECs), also known as Green tags, Renewable Energy Credits, Renewable Electricity Certificates, or Tradable Renewable Certificates (TRCs), are tradable, non-tangible energy commodities in the United States that represent proof that 1 megawatt-hour (MWh) of electricity was generated from an eligible renewable energy resource (renewable electricity) and was fed into the shared system of power lines which transport energy.
Solar renewable energy certificates (SRECs) are RECs that are specifically generated by solar energy Renewable Energy Certificates provide a mechanism for the purchase of renewable energy that is added to and pulled from the electrical grid.
RECs for Wind Energy and SRECs for Solar Energy are traded at \$150 each.

Find the optimum solution for the above configuration and provide the economic as well as environmental impact of the design.
Calculate the Payback time using 5% interest rate and 5 year duration for renewable energy credit.

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