Modular FACTS Units With External Fault Current Protection
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Solution Overview
Problem
Existing FACTS devices are custom-built for specific applications, lack a plug-and-play solution, and have integrated fault-handling circuitry that makes them large, complex, and unsuitable for distributed control applications due to high failure rates and non-standardized designs.
Innovation Solution
The fault current protection modules are moved externally from the FACTS devices, enabling modular, standardized, and lighter units that can be used in distributed applications, with coordinated communication and control through external fault current protection modules (FCPMs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fault current protection circuitry is integrated into FACTS devices, then the devices have complete fault protection capability, but the devices become large, complex, and expensive
Solution Approach 1:
The patent divides the FACTS system into separate functional modules: the core FACTS device and the fault current protection module. This segmentation allows each component to be optimized independently, reducing overall system complexity while maintaining complete protection capability.
Solution Approach 2:
The fault current protection circuitry is extracted from the internal structure of the FACTS device and placed in an external module. This extraction eliminates the complexity and size associated with integrated protection circuits while preserving the reliability benefits of comprehensive fault protection.
2Manufacturing precision
If custom-built FACTS devices are designed for specific applications, then the devices meet specific performance requirements, but no plug-and-play solution exists and deployment is inflexible
Solution Approach 1:
The patent creates a universal fault current protection module that can be applied to multiple different FACTS device types and applications. This standardized module enables plug-and-play deployment across various configurations while maintaining application-specific performance through the core FACTS device design.
Solution Approach 2:
By separating the application-specific FACTS functionality from the standardized protection module, the system enables flexible reconfiguration and deployment. The modular architecture allows different FACTS devices to use the same protection module, creating versatility without sacrificing precision.
3Reliability
If FACTS devices include internal fault protection circuits, then the devices are self-protected, but the size and weight increase making them unsuitable for distributed applications
Solution Approach 1:
The protection circuitry is extracted from the moving FACTS device and placed in a stationary external module. This extraction significantly reduces the weight of the FACTS device itself, making it suitable for distributed applications while maintaining self-protection capability through the external module's coordinated response.
Solution Approach 2:
The external fault current protection module acts as an intermediary between the FACTS device and the fault condition. It provides protection capability without being physically integrated into the FACTS device, thereby reducing weight while maintaining reliability.
4Reliability
If multiple custom-designed protection modules are used for each FACTS device, then each device has appropriate protection, but the cost and complexity increase significantly
Solution Approach 1:
The patent designs a universal fault current protection module that can serve multiple FACTS devices across different applications. This standardization dramatically reduces manufacturing costs through economies of scale and simplifies the supply chain, while each device still receives appropriate protection tailored to its specific needs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the size, weight, and cost of FACTS devices, improves reliability, and allows for flexible deployment in distributed power transmission systems by eliminating redundant internal protection circuits and enabling standardization.
Implementation Method 1
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Data Source
AI summary
Flexible AC transmission system (FACTS) enabling distributed controls is a requirement for power transmission and distribution, to improve line balancing and distribution efficiency. These FACTS devices are electronic circuits that vary in the type of services they provide. All FACTS devices have internal circuitry to handle fault currents. Most of these circuits are unique in design for each manufacturer, which make these FACTS devices non-modular, non-interchangeable, expensive and heavy. One of the most versatile FACTS device is the static synchronous series compensator (SSSC), which is used to inject impedance into the transmission lines to change the power flow characteristics. The addition of integrated fault current handling circuitry makes the SSSC and similar FACTS devices unwieldy, heavy, and not a viable solution for distributed control. What is disclosed are modifications to FACTS devices that move the fault current protection external to the FACTS device and make them modular and re-usable.