Fault Response Control for Renewable Power Plant Ride-Through
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Solution Overview
Problem
Renewable energy power plants, particularly those with complex components like energy storing systems and load systems, face challenges in coordinating the response of all elements during fault ride through, leading to potential instability and voltage oscillations due to slower dynamics of load systems.
Innovation Solution
A control system and method for a renewable energy power plant that includes a fault response system that monitors the status of both the energy generating system and the load system, generating appropriate energy generating system power profiles based on load system profiles to ensure coordinated response during fault ride through, ensuring the power plant as a whole rides through the fault unaffected by slower components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power dissipation systems are operated to dissipate power generated by wind turbines during fault recovery, then active power can be controlled to return to pre-fault levels, but the further components of the renewable energy power plant may counteract the desired performance
Solution Approach 1:
The patent combines multiple control functions (power dissipation control, energy storage control, load management) into a unified fault response system that coordinates all components simultaneously. This integration ensures that the collective behavior of all components supports the fault ride through objective rather than counteracting it, resolving the contradiction between reliability and complexity by making the complex system work coherently.
Solution Approach 2:
The patent implements a feedback mechanism where the fault response system continuously monitors the status of all power plant components and adjusts their operation accordingly. This closed-loop control ensures that each component's response is coordinated with the overall fault ride through objective, preventing components from counteracting the desired performance while maintaining reliable fault handling.
2Ease of operation
If the power plant components respond independently during voltage deviation, then each component can operate according to its own dynamics, but the power plant as a whole may experience instability and voltage oscillations
Solution Approach 1:
The fault response system acts as an intermediary between independent power plant components and the grid. It receives status information from all components and issues coordinated control commands, mediating between individual component operations and overall plant stability. This intermediary function allows components to maintain their operational independence while ensuring their collective behavior supports stable fault ride through.
3Reliability
If the load system ramps up power consumption slowly after fault clearance, then the load system can recover safely, but the active power cannot return to pre-fault levels in a timely manner
Solution Approach 1:
The fault response system prepares control strategies in advance that account for the load system's slow recovery characteristics. By pre-coordinating the responses of power dissipation systems and energy storage devices, the system ensures that active power can be managed appropriately during the load system's gradual ramp-up, maintaining reliability while optimizing power recovery timing.
Data Source
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AI summary
The invention relates to a control system for a renewable energy power plant (100). The power plant (100) comprises an energy generating system (10) configured to supply power to a utility grid (200) and having a wind farm (11) with at least one wind turbine (WT) and/or an energy storage system (12) with at least one energy storage device (SD). Furthermore, it comprises a load system (20) configured to consume and transform energy provided from the energy generating system (10) and/or the utility grid (200) at each point of time and having at least one load (EL). The control system comprises a fault response system (300) configured to monitor the status of the energy generating system (10), monitor the status of the load system (20), and generate an energy generating system power profile (DP11, DP12) in dependence of a given load system power profile (DP20) following a voltage deviation of the utility grid (200) for controlling the energy generating system (10) based on the monitored statuses of the energy generating system (10) and the load system (20) to match a given power plant power profile (DP100).