Micro-Grid Frequency Control for Fast Renewable Load Response
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Solution Overview
Problem
Current micro-grid power distribution approaches are synchronized with commercial grids and rely on slow-acting large power producers for frequency stability, limiting their ability to react to fluctuations in renewable energy sources and restricting the penetration of distributed power generation.
Innovation Solution
A variable utility frequency control (VUFC) system that allows micro-grids to adjust frequency dynamically, enabling load changes and energy storage management based on real-time market conditions, and provides 'synthetic inertia' to enhance upstream grid stability through fast load adjustments and frequency-sensitive pricing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micro-grids are synchronized with commercial grids and rely on large power producers for frequency stability, then grid synchronization is maintained, but the ability to react to fluctuations in renewable energy sources is limited
Solution Approach 1:
The patent segments the power grid into independent micro-grids that can operate autonomously or in synchronization mode. Each micro-grid is equipped with its own frequency control system using distributed energy resources, allowing it to respond independently to local renewable energy fluctuations without being constrained by the larger grid's slow response mechanisms.
Solution Approach 2:
The patent implements dynamic frequency control within micro-grids by utilizing controllable distributed energy resources that can rapidly adjust their output. This dynamic response capability allows micro-grids to adapt quickly to changing renewable energy generation conditions, contrasting with the static, slow-acting large power producers in traditional synchronized grids.
2Adaptability or versatility
If distributed power producers are introduced onto the grid, then renewable energy penetration increases, but grid instability is introduced due to power fluctuations
Solution Approach 1:
The patent implements real-time frequency monitoring and feedback control within micro-grids. Distributed energy resources are controlled based on measured frequency deviations, creating a closed-loop system that automatically responds to power fluctuations. This feedback mechanism allows high renewable energy penetration while maintaining stability through rapid, localized adjustments rather than relying on slow grid-wide responses.
Solution Approach 2:
The patent changes the operating parameters of distributed energy resources based on real-time grid conditions. By adjusting output power, frequency, and voltage parameters of distributed generators in response to renewable energy fluctuations, the system accommodates high renewable penetration while maintaining overall grid stability through localized parameter optimization.
3Reliability
If micro-grids use slow-acting large power producers for frequency control, then frequency stability is maintained, but the penetration of distributed power generation is restricted
Solution Approach 1:
The patent introduces an intermediary frequency control layer at the micro-grid level that mediates between distributed power producers and the main commercial grid. This intermediary control system aggregates frequency responses from multiple distributed resources within the micro-grid, providing a coordinated response that maintains overall grid stability while enabling higher penetration of distributed generation than would be possible with direct grid connection alone.
Data Source
AI summary
Techniques are disclosed for providing a variable output micro-grid frequency in order to cause loads and producers coupled to a micro-grid to change operating modes/behaviors accordingly. For example, the utility frequency delivered via the micro-grid may be used as a control signal for the purposes of demand response, e.g., increasing or decreasing load, energy storage control, e.g., to cause storage of energy or the discharging of energy, and generator output curtailment as is mandated by generator interconnection standards such as UL1741 for output power curtailment under high frequency.