ZERO EXPORT SOLAR SYSTEM

The use of solar energy for self-consumption has many advantages: reducing a site's carbon footprint, the decrease in energy costs, or the possibility of reselling this energy to the national grid when local regulations allow it. Solar panels are directly connected to the grid through inverters; the energy produced is transmitted to the site for self-consumption or is returned to the grid. However, in some countries, the local grid operator do not allow energy injection into the grid. This is called zero export or injection limitation. The injection limitation consists of controlling the amount of electricity produced by a photovoltaic installation injected into the grid. Limiting active power injection may be necessary to relieve the grid and reduce the reinforcement costs that this would imply. Zero export represents the impossibility of injecting any amount of electrical power into the grid, under the following implied terms.. No part of the solar energy produced by the system is allowed to enter the grid. By default, excess solar energy is clipped by an injection limiter. A more economical approach, in which an intelligent energy management system would optimize the amount of energy lost by clipping the right amount of solar-generated power. To be able to do the zero export, we need a net meter [bidirectional meter] on the incoming side, this meter should be enabled to communicate with power control device to read the active power values, where the amount of solar energy in the system is controlled by adjusting the set point of the inverters in the system. The integrated power analyzer measures the total power at the point of coupling and compares this with the adjustable set point of the controller. When the consumption from the grid is above this set point, the solar energy will be increased, when the consumption is below this set point, the solar energy will be reduced.