Microgrid Controller Integration at PCC for Stable Distribution Control
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Solution Overview
Problem
Existing microgrid control systems do not effectively interoperate with distribution management systems, leading to potential instability and blackouts due to complex control schemes and the simplification of microgrids as Virtual Power Plants, which can result in suboptimal operation.
Innovation Solution
A method and system that extends distribution network control into the microgrid by integrating a microgrid controller with a distribution network controller, allowing for selective control modes based on electrical entity thresholds and breaker status, enabling seamless integration and stability during grid-connected and islanded states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If microgrid control systems operate autonomously with simplified Virtual Power Plant models, then device complexity is reduced, but reliability deteriorates due to potential instability and blackouts
Solution Approach 1:
The patent introduces a distribution network controller as an intermediary between the microgrid controller and the Virtual Power Plant. This mediator coordinates control actions, allowing the microgrid to operate with simplified autonomous control while maintaining system-wide stability through centralized oversight and communication.
2Reliability
If distribution network control is extended into the microgrid, then reliability is improved through better coordination, but device complexity increases due to integration requirements
Solution Approach 1:
The control system is segmented into distinct functional layers: the distribution network controller handles high-level coordination and stability, while the microgrid controller manages local autonomous operations. This segmentation allows extended control functionality without requiring complete integration of control logic throughout the entire microgrid system.
3Ease of operation
If microgrids are simplified as Virtual Power Plants, then ease of operation is improved, but manufacturing precision deteriorates in terms of optimal operation
Solution Approach 1:
The patent applies different levels of control sophistication to different parts of the system. The Virtual Power Plant model provides simplified remote operation, while local distribution network controllers maintain precise optimization capabilities. This allows operational simplicity at the plant level without sacrificing optimization precision at the distribution level.
Data Source
AI summary
Method (300) of controlling a distribution network (1) and a microgrid controller (8) adapted for the method. The distribution network (1) comprises assets (3-7) in a first part (1a) and a second part (1b). which parts (1a, 1b) are selectively connected to each other into an interconnected state at a connection point (PCC). The method comprises monitoring (301, 306) and controlling (310) the assets (3-7) of the distribution network (1). In a first control mode (310A), the first part (1a) is controlled by a distribution network controller (9) and the second part is controlled by the microgrid controller (8). Especially, the method includes selecting (303) between controlling (310) the distribution network (1) in the interconnected state in accordance with the first control mode (310A), and controlling (310) the distribution network (1) in the interconnected state in accordance with a second control mode (310B), in which second control mode (310B) the assets (3-7) of the both the first part (1a) and the second part (1b) are controlled by the distribution network controller (9).