World's First 35kV Direct-Mount Synchronous Condenser Stabilizes Wind Power
In the windswept fields of Sunwu County in Heilongjiang Province, where snow has already fallen several times this autumn, rows of wind turbines turn steadily. But the wind blows strong one moment and weak the next, and the voltage on the grid rises and falls with it. Keeping that power stable enough to feed into the broader electricity network is a growing challenge as China adds more renewable energy.
Deep inside the Zhongguang Nuclear Shengshan Wind Farm, a new piece of equipment is tackling that problem. It is the world’s first 35-kilovolt high-voltage direct-mount distributed synchronous condenser, a machine designed to smooth out voltage swings almost instantly. Unlike conventional systems that connect at 10.5 kilovolts and require a separate step-up transformer to reach the grid, this device links directly at 35 kilovolts, eliminating a piece of equipment and saving space and cost.
A synchronous condenser is essentially a rotating electrical machine that can inject or absorb reactive power to keep voltage steady. When voltage sags, it props it up; when voltage spikes, it absorbs the excess. The direct-mount design at 35 kilovolts is what makes this installation notable. By removing the step-up transformer, the system reduces energy losses and improves overall efficiency, according to the project team.
The technology matters because wind farms produce variable output. Gusts can push voltage up, while lulls can cause it to drop. Without fast-acting compensation, these fluctuations can ripple through the grid and, in extreme cases, contribute to widespread outages. The new condenser responds in milliseconds, acting as a kind of shock absorber for the local network.
Engineers at the site say the device has been operating reliably since installation. The project is part of a broader push in China to strengthen grid infrastructure as the country scales up wind and solar capacity. Integrating large amounts of renewable power requires not just more transmission lines but also smarter, faster equipment to keep the system balanced.
The direct-mount approach could be replicated at other wind farms, especially those in remote areas where space and maintenance access are limited. By raising the connection voltage to 35 kilovolts, the system simplifies the plant layout and reduces the number of components that can fail. That simplicity is a key selling point for operators looking to lower long-term costs.
For now, the Shengshan installation serves as a demonstration. Its performance will be watched closely by grid operators and equipment makers alike. If the technology proves itself over a full seasonal cycle, it could become a standard option for new wind projects in China and beyond. The challenge of stabilizing a grid increasingly powered by the weather is not unique to China, and solutions developed here may find buyers abroad.
The device is one of several innovations emerging from China’s push to modernize its power system. As renewable penetration rises, the ability to manage voltage and frequency at the source will become ever more important. The 35-kilovolt condenser is a small but concrete step toward a grid that can handle the ups and downs of a windy day.