Interconnected Renewable Power Plant Control for Grid Stability
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Solution Overview
Problem
The integration of large-scale renewable energy resources, particularly wind power plants, into transmission systems complicates grid management due to remote substation locations and the need for rapid corrective measures, leading to reduced control accuracy and increased costs from required reactive compensation equipment.
Innovation Solution
A power plant control system that manages power delivery across multiple renewable energy power plants, enabling quick responses to grid instabilities by communicating and coordinating power compensation assets between interconnected plants, acting as an energy management system to stabilize the grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple renewable energy power plants are connected to the grid in a compact geographical area, then the integration of renewable energy resources into the transmission system is improved, but the device complexity increases due to the requirement of reactive compensation equipment at each substation
Solution Approach 1:
The patent merges the reactive compensation resources of multiple power plants into a shared pool that can be dynamically allocated. Instead of each plant having dedicated compensation equipment, the system allows plants to borrow reactive power capacity from others through coordinated control, reducing total equipment requirements while maintaining grid stability.
Solution Approach 2:
The invention makes reactive compensation equipment serve multiple functions and multiple power plants simultaneously. A single compensation device can provide reactive power support to any plant needing it, rather than being dedicated to one specific plant, thereby increasing utilization efficiency and reducing overall equipment needs.
2Adaptability or versatility
If substations are located remote from the main transmission grid, then the connection requirements for renewable energy power plants are met, but the control accuracy deteriorates due to delay in commands from TSOs
Solution Approach 1:
The system performs preliminary local control actions based on pre-established control strategies and local measurements. When remote commands experience delay, the local control system has already taken appropriate corrective actions based on real-time local grid conditions, ensuring control accuracy is maintained despite communication delays.
Solution Approach 2:
The invention implements enhanced local feedback mechanisms that continuously monitor grid conditions and automatically adjust control parameters. This closed-loop local feedback compensates for delays in remote commands by detecting and responding to grid instabilities in real-time without waiting for TSO commands.
3Adaptability or versatility
If a high number of power plants are controlled by a TSO, then the penetration of renewable energy is increased, but the productivity of grid management decreases due to inability to carry out corrective measures rapidly
Solution Approach 1:
The patent segments the centralized TSO control function into distributed local control units at each power plant. Each plant's control system operates semi-autonomously, making rapid local decisions without waiting for centralized commands, thereby maintaining high renewable energy integration while improving response speed and management efficiency.
Solution Approach 2:
The invention enables power plants to self-manage their own control operations using local intelligence and real-time measurements. Each plant independently detects grid conditions and executes corrective measures without requiring constant TSO intervention, significantly improving the speed and efficiency of grid management while supporting high renewable penetration.
Data Source
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AI summary
A power plant control system for a first renewable energy power plant comprising one or more renewable energy generators. The power plant control system comprises receiving means for receiving a power delivery demand from a transmission grid operator; control means configured to control the one or more renewable energy generators of the first renewable energy power plant so as to supply power that targets the received power delivery demand; and communication means configured to transmit a request to one or more further renewable energy power plant control systems to request operation of one or more power compensation units associated with respective ones of the further renewable energy power plants. The embodiments of the invention are beneficial in that the power plant control system of the first renewable energy power plant has the functionality to manage the power delivery across multiple power plants, and therefore acts as an energy management system, able to active assets of other power plants so as to react quickly to any grid instabilities that may be detected. This provides a robust response to grid instabilities. The invention has particular utility to wind power plants, but also applies to other types of renewable energy power plants, for example photo-voltaic power plants, hydro-electric power plants and the like.