Cases on Green Energy and Sustainable Development by Peter Yang;

Author:Peter Yang;
Language: eng
Format: epub
Publisher: IGI Global

Table 1. Notation used in microgrid modeling. Since the time unit is one hour, energy (kWh) and power (kW) are equivalent.

Notation Definition

t Time (hours)

St DC solar energy yield (kWh)

Lt AC loads in customer premises (kW)

Xt State of charge of the battery (kWh), i.e. the amount of electric energy stored in the battery

Gt AC power purchased from grid (kW)

An important component of the case studies was to determine the cost-minimizing hourly flow of energy in and out of the lithium ion battery. The model used generates a different schedule based on the type of day (workday or weekend) and the month of the year given that demand profiles and HOEP electricity charges vary based on these two factors. It accounts for discretionary factors such as the inverter capacity, battery capacity and size of the solar system as well as independent factors such as peak demand charge, hourly electricity tariffs, building demand profile, inverter efficiency and battery efficiency. The model can be modified to suit the solar system, demand profile and cost of electricity for any building in any community.

An example of the results that can be generated by using the microgrid scheduling model with a 50 kWh battery is given in Figure 7.

Figure 7. Case 1 battery schedule for a 50 kWh battery: (a) June (b) February (Lt=energy demanded, St=solar power generated, Gt= energy purchased from the grid and Xt=state of charge of the battery)

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