Autonomous Power Network Controllers for Stability
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Solution Overview
Problem
Electrical power networks face stability issues due to cascading outages and blackouts, exacerbated by the increasing use of renewable generation, which reduces inertia and makes them prone to outages and blackouts, and existing control methods such as distributed control approaches and System Integrity Protection Schemes (SIPS) are inadequate in responding quickly and accurately to sudden events like transmission line losses or generator failures.
Innovation Solution
A method and apparatus for controlling an electrical power network using plural controllers configured to provide independent control outputs based on synchronized quantities of frequency and angle at different locations within the network, allowing for rapid and adaptive responses to sudden events without relying on other controllers, thereby reducing the risk of further loss or excess of generation or load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distributed control approaches are used with local control and thresholds, then local stability can be maintained, but the response speed becomes too slow to react to sudden network disturbances
Solution Approach 1:
The system divides the power network into multiple control areas, each with its own controller that operates autonomously. Each controller segments the decision-making process, eliminating the need for centralized coordination and threshold-based discrimination, thereby enabling fast local response while maintaining overall system stability.
Solution Approach 2:
The patent introduces synchronized frequency and angle measurements as intermediary parameters that allow controllers to perceive network-wide conditions without centralized control. These measurements serve as a common reference framework that enables coordinated response across distributed controllers while maintaining independent operation.
2Reliability
If System Integrity Protection Schemes (SIPS) are deployed to protect against stability problems, then network protection is enhanced, but the centralized nature creates single point failure risks and unanticipated interactions between multiple SIPS
Solution Approach 1:
The system replaces centralized SIPS with distributed autonomous controllers at different network locations. Each controller independently monitors its local conditions and responds to disturbances without relying on a central authority, thereby eliminating single point failure risks and reducing interactions between protection schemes.
Solution Approach 2:
Each controller is equipped with the capability to independently detect disturbances, make decisions, and execute control actions based on synchronized measurements. This self-service approach allows controllers to autonomously respond to network events without external coordination, simplifying the overall system architecture.
3Reliability
If SIPS are configured to over-respond to disturbances to ensure protection, then stability is maintained, but the cost increases and the network experiences additional disturbance from the SIPS response
Solution Approach 1:
The system applies differentiated control strategies at different locations based on local conditions and the severity of disturbances. Controllers respond proportionally to actual events rather than using uniform over-response thresholds, thereby maintaining stability while minimizing unnecessary control actions and associated costs.
Solution Approach 2:
The use of synchronized frequency and angle measurements provides real-time feedback to distributed controllers, enabling them to accurately assess network conditions and respond appropriately. This feedback mechanism eliminates the need for conservative over-response configurations by providing precise information about actual disturbance severity.
4Adaptability or versatility
If renewable generation is increased to reduce carbon emissions, then environmental sustainability is improved, but inertia within the electrical power network is reduced and liability to outages and blackouts increases
Solution Approach 1:
The system replaces mechanical inertia-based stability mechanisms with electronic control based on synchronized frequency and angle measurements. This substitution allows fast-acting power electronics to provide stability services that were traditionally dependent on mechanical inertia from synchronous generators, thereby enabling high renewable penetration while maintaining network stability.
Solution Approach 2:
The control system dynamically adjusts responses based on real-time synchronized measurements of frequency and angle. This dynamic control capability compensates for the lack of mechanical inertia by providing adaptive, fast-acting responses to disturbances, enabling stable operation with high proportions of renewable generation.
Data Source
AI summary
A method of controlling an electrical power network in which a sudden event which may lead to loss or excess of generation or load. The electrical power network comprises plural controllers, each controller configured to control an apparatus connected to the power network at a different respective location in the electrical power network. The method comprises determining the occurrence of the sudden and receiving synchronised quantities in each of the controllers each of the quantities corresponding to one of frequency and angle at respective different locations in the electrical power network. The method further comprises generating a control output from each controllers in dependence on the received plural quantities, each control output controlling its respective apparatus, each controller generating the control output independent of operation of any other controller and on an ongoing basis in dependence on ongoing receipt of the plural quantities.