Decentralized Grid Load Control for Real-Time Frequency Balancing
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Solution Overview
Problem
Existing electrical distribution networks face challenges in maintaining balance and stability due to sudden changes in production or consumption, which can lead to frequency and voltage instabilities, potentially causing blackouts.
Innovation Solution
A decentralized control system is implemented at each consumption point, which includes measuring electrical voltages, estimating representative variables of the electrical network's equilibrium state, and adjusting electrical consumption in real-time to maintain balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a centralized SCADA system is used to monitor and control the electrical network, then real-time detection of imbalances is achieved, but the response time is delayed (on the order of a second) and only a limited number of large consumers can be controlled
Solution Approach 1:
The patent divides the centralized control system into decentralized control units distributed at multiple consumption points throughout the electrical network. Each control unit independently monitors local voltage and estimates network equilibrium variables, enabling parallel processing of imbalance detection across the entire network. This segmentation eliminates the single-point bottleneck of centralized SCADA systems, reducing detection delays while maintaining comprehensive network coverage.
2Loss of time
If a decentralized control system is implemented at each consumption point, then response time is reduced and more consumers can be controlled, but the device complexity increases
Solution Approach 1:
The patent designs a universal control unit that can be deployed at any consumption point in the electrical network, performing multiple functions: voltage measurement, equilibrium variable estimation, imbalance detection, and control signal generation. This multi-functional design reduces the need for different specialized devices at different locations, simplifying overall system architecture despite the decentralized nature. The control unit adapts to various consumption points without requiring customization, managing complexity through standardization.
Solution Approach 2:
Each control unit operates autonomously, independently estimating network equilibrium variables and detecting imbalances using local voltage measurements and pre-stored algorithm parameters. The units self-adjust control strategies based on local conditions without requiring continuous centralized coordination. This self-service capability eliminates the need for complex inter-unit communication protocols and centralized arbitration mechanisms, reducing system complexity while enabling rapid local response to imbalances.
3Power
If large industrial consumers are disconnected to relieve grid pressure, then significant consumption reduction is achieved, but productivity of installations is damaged and compensation costs are high
Solution Approach 1:
Instead of completely disconnecting large industrial consumers, the patent applies partial control actions by modulating the power setpoint of controllable loads at distributed consumption points. The control system adjusts power consumption in proportion to detected imbalances, applying just enough reduction to relieve grid pressure without completely shutting down operations. This partial action maintains installation productivity while achieving sufficient consumption reduction to stabilize the electrical network during overload conditions.
Data Source
Figure 1~2
AI summary
The invention relates to a method and device for controlling an electric grid (10) at a point of consumption (20), commanding an electric load (30) connected to the electric grid. The method provides an algorithm for real-time management of the balance of the interconnected electric grid via instantaneous modification of the electric load at the point of consumption with a view to optimizing frequency-regulation services (primary, secondary and tertiary reserves) so as to obtain a constant anti-blackout effect. The method comprises a step (41) of measuring voltages, a step (42, 43) of estimating, at the point of consumption, variables representative of the balance status of the electric grid comprising the frequency of the electric grid and the variation in said frequency and the difference between the total electric power produced and consumed, and a command step (44) that modifies the electric consumption of the electric load when said estimated representative variables are outside a predetermined operating domain.