Power Plant Current Dispatch for Coordinated Grid Injection
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Solution Overview
Problem
Power plants with multiple generating units connected to an electrical grid via a shared connection point face challenges in accurately managing current supply, leading to over or under supply due to localized control of individual units, which can result in inefficiencies and instability in meeting grid demands.
Innovation Solution
A method is introduced where a power plant controller sets reference frames for generator units, measures grid demand voltage, and dispatches current set points to each unit, accounting for active and reactive currents, and synchronizes clocks to ensure coordinated output, thereby centralizing control and improving grid compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control is localized to individual generating units, then each unit can adapt to localized conditions, but the total current injected into the grid becomes uncoordinated leading to over or under supply
Solution Approach 1:
The control system is segmented into two levels: individual generating units maintain local control for adapting to localized conditions, while a central power plant controller coordinates the aggregate output. This segmentation allows both localized adaptability and global coordination to prevent over or under supply.
Solution Approach 2:
A central power plant controller acts as an intermediary between individual generating units and the grid. It receives data from units, calculates required current adjustments, and dispatches setpoints to units to ensure coordinated total current injection while preserving local adaptability.
2Reliability
If a central power plant controller is implemented to coordinate current injection, then grid compliance improves, but system complexity increases
Solution Approach 1:
The central power plant controller performs multiple functions: it monitors individual unit outputs, calculates required current adjustments based on grid demand, transforms setpoints to appropriate reference frames, and dispatches commands to units. This multi-functionality consolidates control tasks into a single system, improving grid compliance without proportionally increasing complexity.
Solution Approach 2:
The system implements feedback loops where the central controller continuously monitors current injection from individual units and grid demand, then adjusts dispatch setpoints accordingly. This feedback mechanism enables automatic coordination and grid compliance while the standardized control algorithm keeps implementation complexity manageable.
3Ease of operation
If individual generating units independently control their output, then localized conditions are addressed, but aggregate current management becomes inefficient
Solution Approach 1:
Control authority is segmented between individual units and the central controller. Units independently manage localized conditions with simple control logic, while the central controller handles aggregate current management by calculating and dispatching coordinated setpoints, thus improving overall productivity without compromising localized operational simplicity.
Solution Approach 2:
The central power plant controller serves as an intermediary that receives local unit data, processes aggregate current requirements, and returns optimized setpoints to units. This intermediary approach maintains ease of operation at the unit level while dramatically improving aggregate current management efficiency through centralized coordination.
Data Source
AI summary
Embodiments provide for the control of a power plant including several generators by setting a reference frame for the generators with a first and a second axis; measuring a grid demand voltage at the shared connection point; determining active and reactive currents required at the shared connection point based on the grid demand voltage and grid codes; transforming the active and reactive currents required at the shared connection point to the reference frame where the first axis defines a first current set point and the second axis defines a second current set point; and dispatching the first and second current set points to generator controllers associated with each generator. Current set points may be generated for positive/negative frames, direct quadrature frames, real/imaginary frames and may be set evenly for all generators or adjusted per generator.