High-voltage directly connected grid-forming energy storage artificial short-circuit test was a complete success-NR エレクトリック株式会社

High-voltage directly connected grid-forming energy storage artificial short-circuit test was a complete success

On April 18, 2025, the world's largest capacity high-voltage directly connected grid-forming energy storage system supplied by NR passed the near-end off-grid and grid-connected artificial short-circuit test in Qinghai Baoku Energy Storage Power Station. It is the world's first for the high-voltage directly connected grid-forming energy storage to carry out the artificial short-circuit test. In the two tests, all high-voltage directly connected energy storage systems output three times the rated current without delay during grid faults, which fully verifies the ideal synchronous power characteristics of grid-forming energy storage in all scenarios of grid connection and disconnection, and has the ability to support any proportion of renewable energy access and seamless switching between grid connection and disconnection.

Haixi New Energy Base in Qinghai has an installed capacity of 24 GW, with renewable energy accounting for more than 95%, which is a very high proportion of renewable energy base. Due to the lack of traditional synchronous power support, the stations short-circuit ratio breaks through a new low, and voltage and frequency issues are prominent.

NR provided a complete set of high-voltage directly connected grid-forming energy storage system based on ideal synchronous power supply for Qinghai BaoKu Energy Storage Power Station, with an installed capacity of 108 MW/430 MWh, which is the world's largest capacity grid-forming high-voltage directly connected energy storage project till now. The successful commissioning of the project will effectively support the strength of the power grid in Haixi region, improve voltage and frequency stability, and has positive demonstration significance in helping Qinghai to build a clean energy industry base.

In order to fully verify the grid support performance of grid-forming energy storage, the test covers both off-grid and grid-connected modes: in the off-grid mode test, the high-voltage directly connected energy storage is used as the only power source to support the operation of low-voltage centralized energy storage and other production loads in the station, and harsh tests such as black start, charging transformer, and near-end three-phase artificial short-circuit are carried out in the full off-grid scenario, which fully verifies the voltage source characteristics and transient fault support capability of the island power supply by the grid-forming energy storage, and provides a replicable technical solution for the adoption of renewable energy power system in islands and remote areas. Under the grid-connected mode, all the grid-connected energy storage systems in parallel operation have no delayed response during the fault period, and their output currents are highly consistent, which fully verifies the support characteristics of grid-forming energy storage systems for the power grid and their fault-traversal capability under the transient steady state and shows the excellent performance of the cluster control, which provides toughness guarantee for the regional power grid to withstand the faults.

NR continues to lead the development of grid-forming control technology, and has successfully implemented more than 70 grid-forming projects, with a total capacity of more than 7GW. NR proposes to build the ideal synchronous power supply based on energy storage, providing core equipment support for the construction of a new type of power system with wind power and photovoltaic as the main body, and providing solution for the “zero carbon” goal.

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