Overview

Lingqi Technology provides a comprehensive secondary system communication solution for distributed photovoltaic (PV) grid connection. The solution integrates telecontrol, local monitoring, AGC/AVC automatic generation control, dispatch data communication, and grid cybersecurity into a unified architecture. By leveraging Lingqi’s PBox series intelligent communication gateways, a single device replaces the traditional 4-5 discrete components, drastically simplifying system architecture and reducing deployment costs by up to 40%. The solution covers grid connection voltage levels from 10kV to 110kV and supports string, central, and distributed inverter topologies.

The core technology stack comprises four key layers: the telecontrol layer collects data from inverters, combiner boxes, pad-mounted transformers, and meters, then forwards it via IEC 60870-5-101/104 to dispatch centers; the AGC/AVC control layer receives grid dispatch commands and dynamically allocates active and reactive power across inverters using the PBox6220-PQCT; the cybersecurity layer deploys vertical encryption authentication and horizontal physical isolation devices; and the cloud layer pushes real-time operational data to owner O&M centers through MQTT/HTTP. Applicable standards include IEC 61850, IEC 60870-5-104, and national grid security regulations.

Lingqi has delivered this solution to over 100 PV projects totaling more than 500 MW, serving customers across China. As a National High-Tech Enterprise, Lingqi’s “one replaces many” design philosophy has redefined the standard architecture for distributed PV grid connection communications, enabling EPC contractors and plant owners to achieve faster grid approval, lower costs, and more reliable operations.

Applicable Products

• PBox6220-PQCT (AGC/AVC controller)
• PBox Series Communication Manager
• Industrial Firewall (vertical encryption)
• IoT Gateway (cloud forwarding)