Power Plant Fault Ride-Through Control for Coordinated Load Recovery
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Solution Overview
Problem
Renewable energy power plants, particularly those with energy storing and load systems, face challenges in coordinating the response of all components during fault ride through, leading to potential instability and voltage oscillations due to slower dynamics of load systems preventing rapid recovery post-voltage deviation.
Innovation Solution
A control system and method that monitors the status of both energy generating and load systems, generating power profiles to coordinate the response of wind turbines and energy storage devices to match a given power plant profile, ensuring the plant rides through voltage deviations without exceeding pre-fault power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If load systems are allowed to operate independently during fault ride through, then each component can operate autonomously, but the overall power plant stability deteriorates due to uncoordinated response and voltage oscillations
Solution Approach 1:
The patent merges the control of multiple independent components (wind turbines, energy storage devices, load systems) into a unified control framework. The central controller coordinates the response of all components during fault ride through, ensuring their combined action maintains power plant stability while allowing each component to operate autonomously according to its capabilities.
Solution Approach 2:
The patent implements a feedback mechanism where the central controller continuously monitors the status of all components and adjusts their operation in real-time during fault conditions. This feedback loop ensures that the uncoordinated response of individual components is corrected, preventing voltage oscillations and maintaining overall stability.
2Reliability
If energy storage systems and power dissipation systems are added to enable fault ride through, then the ability to maintain power output during voltage deviations improves, but the device complexity increases due to additional components requiring coordination
Solution Approach 1:
The patent makes the central controller a universal coordinating entity that manages multiple functions: monitoring wind turbines, energy storage devices, load systems, and power dissipation systems. This single multi-functional controller reduces the need for separate control mechanisms for each component, managing complexity while enabling reliable fault ride through.
Solution Approach 2:
The central controller acts as an intermediary that coordinates between the various components (energy storage systems, power dissipation systems, load systems). This intermediary manages the interactions and potential conflicts between components, enabling them to work together harmoniously during fault conditions without requiring complex direct interconnections between all components.
3Speed
If active power is ramped up rapidly after voltage fault clearance, then the recovery speed improves, but adverse effects on the utility grid occur due to sudden power injection
Solution Approach 1:
The patent implements dynamic control of the active power ramp-up process. The central controller adjusts the ramping rate of active power based on real-time grid conditions and the state of power plant components. This dynamic adjustment allows rapid recovery when grid conditions permit while preventing adverse effects when the grid is still recovering, optimizing both recovery speed and grid safety.
Data Source
AI summary
A control system for a renewable energy power plant is provided. The power plant includes an energy generating system to supply power to a utility grid and having a wind farm with one wind turbine and/or an energy storage system with one energy storage device. It includes a load system to consume and transform energy from the energy generating system and/or the utility grid at each point of time and having one load. The control system includes a fault response system to monitor the status of the energy generating system, monitor the status of the load system, and generate an energy generating system power profile in dependence of a given load system power profile following a voltage deviation of the utility grid for controlling the energy generating system based on the monitored statuses of the energy generating system and the load system to match a given power plant power profile.