China's Yangzhou-Zhenjiang Phase II is now in operation
The world's first multi-source commutation HVDC transmission project—Yangzhou-Zhenjiang HVDC Phase II—has been put into operation.
On February 12, 2026, the world's first self-adaption statcom and line commutated converter (SLCC) HVDC transmission project and China's first AC-DC hybrid cross-river transmission project—the ±200 kV Yangzhou-Zhenjiang HVDC Phase II Project—successfully completed its 168 hours trial operation and commenced commercial operation.
This marks the world's first application of multi-source commutation HVDC technology and serves as a key project to enhance the Jiangsu power grid's capacity for north-to-south power transmission.The total lenth of the Yangzhou-Zhenjiang HVDC Phase II Project is 228km. It operates at a rated voltage of ±200 kV with a rated transmission capacity of 1,200 MW. This project continues to utilize the “AC-to-DC conversion” corridor, adding a new cross-river DC transmission line.
It further enhances Jiangsu's “north-to-south power transmission” capacity by 1,200 MW, significantly boosting the regional grid's regulation capabilities and facilitating broader integration of renewable energy. Upon commissioning, the Phase II project will triple the existing cross-river transmission capacity.
The project employs a symmetrical single-pole DC topology. The sending-end converter station utilizes a twelve-pulse LCC configuration, while the receiving-end converter station adopts SLCC technology comprising a six-pulse LCC and a valve-side directly-connected Static Var Filte(SVF). The LCC handles active power transmission, while the SVF provides both dynamic reactive power compensation and filtering functions.
As a primary equipment supplier for this project, NR Electric provided the control and protection system, converter valves (Shaozhuang Station) and valve cooling system, measurement system, AC protection, and centralized control system for this project. This project effectively addresses severe challenges such as system voltage fluctuations and increasingly complex harmonics, demonstrating superior performance particularly in harmonic suppression, prevention of commutation failures, AC fault ride-through, and DC line fault ride-through and restart capabilities. It simultaneously supports end-to-end operation and power mutual assistance at the receiving end, functioning as an “intelligent power router” that provides a novel solution for future complex grid operations.
