In the vast, windswept expanses of the ocean, a silent revolution is underway. Offshore wind power is surging, and with it, the need for robust, reliable transmission systems that can weather the storms—both literal and metaphorical. A groundbreaking study published in Dianli jianshe, translated as ‘Electric Power Construction’, is set to redefine how we approach fault ride-through in grid-forming modular multilevel converters (MMCs), a critical component in offshore wind power transmission.
At the heart of this research is a team led by FANG Chaoxiong from the State Grid Fujian Economic Research Institute and TANG Yuchen from the Shanghai University of Electric Power. Their work delves into the operational characteristics of grid-forming MMCs during short-circuit faults in the receiving-end grid, an area that has remained largely unexplored until now.
The team’s innovative approach focuses on a low-voltage fault internal potential reconstruction ride-through control strategy. In simpler terms, they’ve found a way to make MMCs more resilient during grid voltage dips, a common occurrence in offshore environments. “Our strategy reconstructs the internal potential using current optimization commands,” explains FANG, “This allows for active voltage support under different grid voltage dips, enhancing the overall stability of the system.”
The implications for the energy sector are profound. Traditional fault ride-through strategies often result in large transient impact currents and slow reactive power support responses. This not only poses a risk to the equipment but also to the reliability of the power supply. The new strategy, validated through a semi-physical experimental platform, demonstrates a significant reduction in transient impact currents and a quicker reactive power support response.
This means that offshore wind farms can continue to operate safely and efficiently even during severe voltage drops, a common occurrence in deep-sea environments. “As the grid-voltage dip deepens, the reactive power generated increases accordingly,” notes TANG, “However, the grid-forming current is limited at deeper dip levels, ensuring a stable and reliable power supply.”
The commercial impacts are equally compelling. With this new strategy, energy companies can expect reduced downtime, lower maintenance costs, and a more stable power supply. This is particularly crucial for offshore wind farms, where maintenance can be challenging and costly.
Moreover, this research lays the foundation for future developments in fault ride-through technology. As offshore wind power continues to grow, so too will the demand for innovative solutions that can ensure the safe and reliable operation of these systems. This study, published in Dianli jianshe, is a significant step in that direction.
The team’s work is not just about improving existing technologies; it’s about paving the way for a future where offshore wind power is a reliable and sustainable source of energy. As we stand on the cusp of a renewable energy revolution, studies like this one are more important than ever. They challenge us to think beyond the status quo, to innovate, and to push the boundaries of what’s possible. And in doing so, they bring us one step closer to a future powered by clean, renewable energy.
