On June 5th, the State Grid Liaoning Electric Power Co., Ltd. successfully conducted the country's largest capacity 50,000 kVA grid-connected Static Var Generator (SVG) artificial short circuit test at the Huaneng Fuxin Zhangbei Wind Farm with a capacity of 400,500 kW. This test verified the key performance indicators of new equipment under system faults and their support for system voltage, providing a technical path for the construction of new power systems and the integration and consumption of large-scale new energy sources.
The Huaneng Fuxin Zhangbei Wind Farm is connected to the northern Fuxin power grid through long-distance lines. The northern Fuxin grid is a critical link in the transmission channel between Eastern Inner Mongolia and Liaoning, with a new energy generation capacity approximately ten times that of thermal power in the region. The area has a relatively small electricity load and is a typical export-oriented grid. When new energy generation in Liaoning and the Tongliao region of Eastern Inner Mongolia is high, this grid faces typical risks of voltage instability.
The grid-connected SVG uses independent voltage source control technology. At the moment of fault occurrence, it maintains the internal potential amplitude unchanged, instantly outputs reactive power and current to support system voltage, and responds quickly. During fault recovery, it can flexibly control reactive power and current to support the stable and rapid restoration of AC voltage.
On April 26th, State Grid Liaoning Electric Power organized the commissioning of the 50,000 kVA grid-connected SVG at the Huaneng Fuxin Zhangbei Wind Farm and conducted live testing. This time, the company carried out a three-phase short circuit grounding test, completed semi-physical simulation analysis in advance, and performed equipment-level, station-level, and system-level electromagnetic transient simulation through the power system's all-digital simulation platform. The fault characteristics of the grid-connected SVG were verified, enhancing the wind farm's stable operation and transient voltage support capabilities. The test comprehensively analyzed the impact of the short circuit on the grid and prepared emergency measures to fully control test risks. The test confirmed that in the event of a ground fault in the grid, the grid-connected SVG could provide three times the reactive current and twice the reactive power, ensuring normal operation of the Fuxin grid and nearby new energy stations.
For the first time, State Grid Liaoning Electric Power has realized the actual measurement of the performance of the 50,000 kVA grid-connected SVG device in a large grid environment. The analysis systematically assessed the stable support of the grid-connected SVG for wind turbines, wind farms, regions, and multi-level grids. This is of significant importance for the safe operation of the grid and the consumption of new energy. It can effectively enhance the new energy acceptance level of the northern Fuxin grid, further expand the new energy acceptance boundary of the northern Fuxin grid, and strengthen the grid's disturbance resistance and self-healing capabilities.
