Photovoltaic Power Generation Zero-export Solution and Energy Meter

Acrel provides diversified solutions in the field of photovoltaic power generation anti backflow, aiming to ensure that the photovoltaic system does not reverse power to the grid during the power generation process through real-time monitoring, power regulation, energy storage coupling and other technical means, thereby ensuring grid safety and power quality.

Why do you need zero-export function?

Excessive electricity input into the power grid simultaneously can result in a degradation of power quality and trigger electrical faults, particularly in areas with outdated wiring infrastructure. To mitigate these issues, certain regions have implemented restrictions or prohibitions on power input to the grid, necessitating the installation of anti-reverse current devices. Additionally, some photovoltaic projects may not promptly obtain electricity sales permits upon completion. In such cases, installing anti-reverse current equipment allows for earlier utilization of green energy.

Real time monitoring and power regulation scheme

When reverse flow is detected, the inverter adjusts the output power through the 485 communication interface, switching from maximum power tracking mode to power limiting mode until the reverse flow returns to zero. This solution is easy to install, cost-effective, and suitable for single inverter scenarios.

Install energy meter or current sensor at the point of common coupling (PCC). Upon detection of reverse power flow towards the grid, maintain constant inverter output while activating the bidirectional converter to store excess electrical energy in the battery storage system. This stored energy is subsequently released during periods of reduced photovoltaic generation or increased load demand.