Microgrid Cluster Battery Control for Economic Power Sharing
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Solution Overview
Problem
Current power management and operational control strategies for microgrid clusters with heterogeneous batteries fail to optimize economic power distribution and voltage regulation across different time scales, leading to additional power losses as the clusters scale up.
Innovation Solution
A hierarchical distributed control method with a two-layer control structure incorporating primary droop control and two-layer voltage regulation and power management control, which standardizes the incremental costs of heterogeneous battery units and employs P-V primary droop control and two-layer voltage regulation controllers to achieve economic power distribution and voltage regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If heterogeneous batteries are integrated to meet various power demand scenarios, then adaptability is improved, but power losses increase due to coordination challenges
Solution Approach 1:
The patent implements a two-layer control structure that segments the power management function: the upper layer handles economic power distribution and coordination among heterogeneous batteries, while the lower layer manages real-time power regulation. This segmentation resolves the contradiction by enabling independent optimization of each layer, thereby maintaining adaptability while minimizing coordination losses.
Solution Approach 2:
The patent introduces a hierarchical control mechanism as an intermediary between heterogeneous batteries with different characteristics (lithium-ion, flow batteries, etc.). This intermediary coordinates power distribution by calculating optimal power allocation based on incremental costs and efficiency, enabling diverse battery types to work together efficiently without significant power losses.
2Adaptability or versatility
If multiple microgrid clusters are interconnected to expand application scenarios, then system capability is improved, but voltage regulation complexity increases
Solution Approach 1:
The patent applies segmentation to voltage regulation by implementing a two-layer control structure where the upper layer handles economic power distribution and the lower layer handles real-time voltage regulation. This segmentation simplifies voltage regulation complexity by isolating it to a dedicated layer with specialized control algorithms, enabling multiple microgrid clusters to be interconnected efficiently.
3Productivity
If hierarchical distributed control is implemented, then power distribution efficiency is improved, but control structure complexity increases
Solution Approach 1:
The patent segments control functions into two specialized layers: upper layer for economic power distribution and lower layer for real-time voltage regulation. This segmentation improves power distribution efficiency by enabling independent optimization of each function while managing complexity through clear functional separation and standardized interfaces.
Solution Approach 2:
The patent designs the hierarchical control structure with universal components that can handle multiple functions. The upper layer's economic power distribution algorithm can accommodate different battery types and configurations, while the lower layer's voltage regulation mechanism provides standardized control, reducing overall system complexity despite the multi-functional requirements.
Data Source
AI summary
The invention pertains to the control technology of microgrid energy storage systems, particularly to a hierarchical distributed control method and device for microgrid cluster with heterogeneous batteries. This method includes primary droop control, two-layer voltage regulation control, and two-layer power management control. The incremental cost of heterogeneous batteries is physically defined as the partial derivative of energy loss with respect to output power. A cooperative control method for the incremental cost of multiple heterogeneous battery units is proposed, which can achieve economic power distribution among multiple heterogeneous battery units while meeting the constraints of charging/discharging power, SoC, and power balance. This invention's method integrates battery types where charging efficiency is tied to charging power with those where charging efficiency is connected to SoC, ensuring ease of expansion. Even with the introduction of a new battery type in the microgrid cluster, the method continues to be effective.