Collaborative Grid Frequency Control Using Source-Load-Storage Balancing
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Solution Overview
Problem
Traditional power grid dispatching modes fail to effectively manage the increasing load peak and off-peak differences, inadequate frequency regulation, and the integration of new energy sources and loads, leading to operational challenges and equipment overload in power grids.
Innovation Solution
A source-grid-load-storage networked collaborative frequency control method that acquires and regulates total active power, allocates power capacities among wind, photovoltaic, micro-grid, and energy-storage units, and coordinates with external systems to maintain frequency balance, using active and passive response modes to compensate for power differences and deficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional centralized power generation dispatching mode is used, then power grid operation is simplified, but frequency regulation capability is insufficient and load peak-off-peak differences cannot be effectively managed
Solution Approach 1:
The patent segments the traditional centralized power generation system into multiple distributed power generation units (wind, photovoltaic, micro-grid, energy storage) distributed across the network. Each unit independently participates in frequency regulation, transforming a single-point control system into a multi-node collaborative control system, thereby enhancing frequency regulation capability while maintaining operational simplicity through standardized control protocols.
Solution Approach 2:
The patent introduces a new dimension of control by integrating energy storage systems into the power generation-distribution-consumption chain. Energy storage units provide rapid response capability for frequency regulation, adding a temporal dimension (fast response) to the control system that complements the spatial distribution of multiple generation units, thereby significantly improving frequency regulation performance.
2Adaptability or versatility
If new energy sources and loads are integrated into the power grid, then clean energy utilization increases, but operating characteristics change and control difficulty increases
Solution Approach 1:
The patent creates a universal control framework where distributed power generation units, energy storage systems, and adjustable loads all participate in frequency regulation through standardized protocols. Each component can perform multiple functions (power generation, energy storage, frequency regulation, voltage support), reducing the need for specialized equipment and simplifying the overall control architecture despite the diversity of integrated resources.
Solution Approach 2:
The patent implements a feedback-based collaborative control mechanism where each distributed unit continuously monitors grid frequency and automatically adjusts its output based on frequency deviations. The control system receives feedback from multiple sources (frequency measurements, power output, storage state) and dynamically coordinates unit operations, transforming the complex multi-component system into a self-regulating network that adapts to changing operating conditions.
3Reliability
If loads are cut back to compensate for inadequate frequency regulation capability, then frequency stability is maintained, but device overload and transmission section overload occur
Solution Approach 1:
The patent enables distributed power generation units and energy storage systems to autonomously participate in frequency regulation by monitoring grid frequency and automatically adjusting their own output. This self-service capability eliminates the need for centralized load shedding, as each unit independently contributes to frequency stabilization, thereby maintaining frequency stability without causing equipment overload or transmission congestion.
Data Source
AI summary
A source-grid-load-storage networked collaborative frequency control method is disclosed, which comprises acquiring total active power ΔP to be regulated during a secondary frequency regulation process of a power grid; performing frequency regulation by source-grid-load-storage of the power distribution system, allocating power regulation capacities, and determining whether the desired total active power is met after the frequency regulation; if the desired total active power is met, determining whether power of power generation units is out of limit; if the power of the power generation units is not out of limit, keeping active power of the power distribution system in balance to complete frequency regulation of the power grid; if the power of the power generation units is out of limit, correcting the power regulation capacities of the power generation units of the source-grid-load-storage and compensating a power difference to keep the active power of the power distribution system in balance.