Time: August 2024;

Location: Guazhou, Gansu.

The Gankouhe North and South Wind Farm project is jointly implemented by China Green Power in conjunction with Hopewind Electric, Shanghai Jiao Tong University and other units. It has systematically overcome key technologies such as self-synchronizing voltage source wind turbines and coordinated control of stations. The project was completed in December 2023 and has now passed all-round test experiments such as steady state, transient state, grid connection, off-grid and black start, as well as station-level tests such as full-field black start, isolated grid with load, and artificial short circuit in the field. The test results show that this wind farm already has the characteristics of a main power source. Its active support ability for voltage and frequency and grid-forming characteristics can be comparable to traditional synchronous generator sets. It also has the capabilities of station-level isolated grid operation and black start, which can improve the safety and stability limits of accessing the power grid and provide an important reference solution for building a new power system with new energy as the main body.

In the construction process of this main power source wind farm, wind power converters play a crucial role. Hopewind Electric has long been engaged in the research on the adaptability and supportiveness of new energy power grids. In January 2023, it obtained the world's first conformity statement for grid-forming converters issued by the internationally renowned certification body DNV. Now it has launched a station-level grid-forming solution. The "main power source type" wind power converter is developed on the basis of the grid-forming converter technology accumulated by Hopewind Electric over many years. In addition to supporting autonomous voltage building, autonomous synchronization, and active support of grid voltage/frequency, it also realizes the short-circuit current output capability of "3 times · 1.25 seconds", as well as the small-disturbance adaptive stability and large-disturbance autonomous coordinated response of multi-voltage source clusters. To verify the synergistic effect of multi-voltage source clusters, high-precision time synchronization technology is also used in the testing process to realize synchronous monitoring and measurement of multiple wind power converters. The powerful low-voltage/high-voltage/chain fault ride-through support ability, excellent broadband dynamic characteristics, and weak grid adaptability provide a strong guarantee for the uninterrupted and stable operation of wind turbines and stations under various grid-connected/off-grid conditions. In eight months, through the collaborative efforts of multiple parties, the complete tests of single-unit, multi-unit and station-level have been completed on site, including inertia response, primary frequency modulation, autonomous voltage regulation, low-voltage high-voltage chain faults, power quality, broadband impedance characteristics, strong and weak grid adaptability, as well as full-field black start, isolated grid with load, and artificial short circuit in the field. Finally, the main power source operation mode of the entire 100MW-level wind farm station has been realized, creating a precedent in the industry.