Cases-GoLead Intelligent

An Offshore Wind Power Project of Huaneng Group

Overview

The non-disturbance fast transfer system features multiple switching modes and integrated protection functions, allowing flexible configuration and adjustment to suit different operating conditions. It ensures fast and safe power source transfer under complex scenarios, which is critical for shortening outage recovery time and improving overall economic performance.

As the Group’s first offshore wind power project, this wind farm addressed the long-standing challenge that uninterrupted transfer could not be implemented on energized high-voltage busbars in renewable energy stations. By deploying the non-disturbance fast transfer system, the project achieved the first engineering application of 35 kV energized-bus smart and reliable switching technology in the renewable energy sector.

Successful commissioning of the system has significantly increased annual energy production during main transformer maintenance periods, greatly reduced wind curtailment, and alleviated the workload of operation and maintenance personnel during maintenance outages. The solution delivers substantial economic benefits and provides an effective and replicable reference for addressing generation losses during transformer maintenance under similar network configurations across the Group.

For offshore wind power supply systems dominated by large-scale power converters, the solution focuses on real-time voltage monitoring of two energized 35 kV bus sections under various operating conditions. Short-term bus coupling analysis and power flow distribution calculations serve as key analytical supports, supplemented by smart power allocation limits to ensure smooth and reliable switching.

In wind and photovoltaic generation systems, where system robustness is relatively low and bus operating conditions are complex, switching processes must also account for the operating states of main transformers, grounding transformers, and SVGs, making circulating current analysis more challenging. By establishing a comprehensive system operation model and integrating bus sectional voltage monitoring with circulating-current and transient power flow analysis, our company has optimized and upgraded fast transfer technology to achieve stable and smooth switching for multi-source busbar configurations with large-scale converter-based generation.

Pain Points & Solutions

Pain Point 1: Complex Switching Operations with Low Safety

Conventional switching operations rely on repeated coordination through backend systems or on-site manual actions, increasing operational complexity and posing a risk of power interruption during the switching process.
Solution 1

The transfer device features a one-button switching function. Operators can initiate a normal transfer command either remotely or locally, and the device automatically completes uninterrupted power transfer between sources within seconds, ensuring a simple, safe, and reliable switching process.
Pain Point 2: High Probability of Power Supply Abnormalities

The in-plant power supply system has a complex hierarchical structure with multi-level cascaded feeders, making it prone to power supply abnormalities.
Solution 2

Non-disturbance fast transfer devices are deployed at each level of the power supply system. When any segment within the supply network becomes abnormal, the device automatically identifies the fault through multiple built-in power abnormality initiation criteria and rapidly initiates seamless transfer to the standby power source without disturbance.
Pain Point 3: Economic Losses and Safety Incidents

Voltage dips may cause partial production loads to stop, interrupting processes or operations. Fluctuations in temperature and pressure can degrade product quality or reduce output. Voltage reduction may also lead to equipment failures, potentially triggering secondary production and equipment incidents. Restarting equipment requires time and operational procedures, increasing cleanup workload and further reducing production efficiency. Such events can result in severe economic losses and significant potential safety risks for users.
Solution 3

The non-disturbance fast transfer device supports multiple switching modes and rapid closing functions, allowing flexible configuration and adjustment according to different operating conditions and requirements. It ensures fast and safe power source transfer under complex scenarios, effectively minimizing production interruptions and associated risks.

Values

Simple & Flexible

One-button normal power switching reduces operational complexity and operation & maintenance costs, including staffing requirements. Multiple built-in switching modes and criteria flexibly meet the needs of various operating conditions.
Economical & Safe

Eliminates production issues caused by unstable power supply, directly protecting production processes and product quality. It also reduces scrap and waste, lowers the risk of equipment damage, and supports energy efficiency and cost reduction.
Working Environment

Minimizes the need for personnel to work in complex environments, thereby reducing safety risks.

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