Hydroelectric Plant Flow Control with Weighted Power Optimization
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Solution Overview
Problem
Conventional systems for controlling hydroelectric plants in series along a watercourse face challenges in maintaining hydraulic constraints and electricity production compliance, particularly with unpredictable inflows and the need for real-time frequency adjustments, leading to difficulties in reconciling hydraulic and electrical constraints.
Innovation Solution
A system that controls the flow of turbined water by setting a flow rate setpoint for each hydroelectric plant, taking into account level regulation and inflows, and adjusts overall power production to comply with hydraulic and electrical constraints using dynamic or constant weighting coefficients to optimize power distribution and demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional systems control each plant independently with local level regulation, then hydraulic constraints are maintained, but electricity production compliance deteriorates due to unpredictable inflows and lack of coordinated power optimization
Solution Approach 1:
The patent merges local level regulation with centralized power optimization by integrating a global power optimization module that coordinates all plants in the series. This combination allows the system to maintain hydraulic constraints through local regulation while achieving electricity production compliance through centralized coordination of power setpoints across all plants.
Solution Approach 2:
The system implements feedback mechanisms where actual power production and inflow measurements are continuously monitored and fed back to the global optimizer. This feedback loop enables real-time adjustments to power setpoints, allowing the system to adapt to unpredictable inflows while maintaining compliance with both hydraulic constraints and electricity production targets.
2Ease of operation
If the system adjusts power production to follow unpredictable inflows, then hydraulic constraints are satisfied, but electricity production compliance deteriorates due to program deviations
Solution Approach 1:
The system performs preliminary optimization by calculating optimal power setpoints in advance based on forecasted inflows and hydraulic constraints. This preliminary action allows the system to prepare compliance strategies before actual inflow variations occur, enabling it to maintain both hydraulic satisfaction and power production program compliance even when inflows become unpredictable.
3Manufacturing precision
If manual redeclaration of power setpoints is performed to maintain compliance, then electricity production compliance is maintained, but system complexity and operational burden increase
Solution Approach 1:
The global power optimization module implements self-service by automatically calculating and adjusting power setpoints for all plants without requiring manual intervention. The system independently handles compliance maintenance through automated optimization algorithms, eliminating the need for manual redeclaration and reducing operational burden while maintaining precision.
4Power
If real-time frequency adjustment services are provided, then electrical network stability is improved, but hydraulic constraint compliance deteriorates due to flow variations
Solution Approach 1:
The system applies dynamics by making the power setpoints adjustable in real-time based on network frequency requirements. The global optimizer dynamically recalculates power distribution among plants while considering hydraulic constraints, allowing the system to provide frequency adjustment services without compromising hydraulic compliance through coordinated real-time adjustments.
Data Source
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AI summary
The invention concerns a system for controlling the flow of turbined water from a plurality of hydroelectric plants (1, 2, 3, 4, 5) arranged in series along a watercourse with open channel flow, defining upstream of each plant a plurality of head races subject respectively to hydraulic flow and level constraints, said plurality of hydroelectric plants, in which the flow of water turbined by each of said plants is controlled by means of a flow setpoint (QCui), said system comprising regulation of a global electrical production power setpoint (Pc) for said plurality of hydroelectric plants by means of a flow regulation setpoint (QRGP) taken into account by the flow setpoint (QCi) of each of said plants, and in that said flow regulation setpoint (QRGP) determined by said regulation is weighted for each of said plants by means of weighting coefficients (αi) as a function of the respective hydraulic characteristics of the head races defined upstream of said plants.