IMPLEMENTATION OF INVERTER AND POWER CONTROL UNIT USING SOLAR NET-METERING
Dr. Farhan Mehmood
In recent times many energy experts, scientists, engineers and activists actively promote a 100%
renewable energy vision. The recent reports suggest that, we have already used almost 2/3 of our
carbon budget and at the current projected rate; this entire budget will be used by the year 2040.
So, there is a need to shift our investment as well as enhance our research on renewable energy
sources. The solar photovoltaic (PV) generation is becoming more important as a renewable
energy source since it offers many advantages such as no fuel cost, no noise, no pollution and
less maintenance. Photovoltaic (PV) generation requires expensive batteries to store energy for
the use in night. Using net energy metering (NEM) we can use the energy delivered by the
electric distribution companies such as WAPDA in night or cloudy weather and solar energy in
day time. Net energy metering requires the meter to measure two quantities. First quantity is the
Energy delivered by the electric distribution company (WAPDA) to the consumer (imported
energy) and second quantity is the energy delivered by the consumer to the electric distribution
company (exported energy). Bidirectional net meter is developed to calculate to display the
difference between imported and exported energy. Customers are allowed to store their extra
electricity on the grid and use it later using both net metering and Time of Use (TOU) policies.
For example, a resident can sell his excess energy during on-peak times and buy it at off-peak
hours. Not only can we use energy efficiently but we can contribute to the fulfilment of
increasing energy demand of our country.