Distributed Energy Resource Control for Local Reactive Power Stability
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Solution Overview
Problem
The traditional centralized power grid faces challenges in managing distributed energy resources, particularly with the integration of renewable energy sources and peak demand, leading to issues such as grid voltage control and reactive power instability, which limits the connection of renewable energy and causes strain on the infrastructure.
Innovation Solution
An intelligent grid operating system (iGOS) that aggregates distributed energy resources (DERs) to manage real and reactive power locally, enabling DERs to generate the necessary reactive power and stabilize the grid, while also providing energy management at the point of consumption, thereby enhancing grid reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If distributed energy resources are integrated into the traditional centralized grid, then renewable energy connection is enabled, but grid voltage control and reactive power instability occur
Solution Approach 1:
The patent implements local reactive power compensation at distributed energy resource sites using power conversion devices. Each DER is equipped with local control that independently manages reactive power, rather than relying on centralized grid control. This local quality approach allows each DER to maintain its own voltage stability while integrating into the broader grid system.
Solution Approach 2:
The patent introduces power conversion devices as intermediaries between distributed energy resources and the traditional grid. These devices include power conversion circuits with control systems that mediate the interaction between DERs and the grid, managing reactive power flow and voltage control to prevent instability while enabling renewable integration.
2Reliability
If distributed energy resources generate reactive power locally, then grid stability is improved, but device complexity increases
Solution Approach 1:
The patent designs power conversion devices that perform multiple functions: real power conversion, reactive power compensation, voltage control, and grid synchronization. By making these devices multi-functional, the system achieves grid stability without adding separate dedicated devices for each function, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The patent combines reactive power compensation capabilities with the existing power conversion infrastructure of distributed energy resources. Rather than adding separate reactive power compensation devices, the invention merges these functions into the power conversion devices already present in DER systems, reducing the need for additional complex equipment.
3Stability of the object's composition
If centralized grid management controls reactive power, then grid-wide coordination is achieved, but response time to local disturbances increases
Solution Approach 1:
The patent segments the reactive power control function from centralized grid management and distributes it to local DER control systems. Each DER independently monitors and responds to local voltage conditions, enabling rapid local response to disturbances. This segmentation maintains grid-wide coordination through communication protocols while dramatically improving response speed to local events.
Solution Approach 2:
The patent implements preliminary local control capabilities at each distributed energy resource, where control systems are pre-configured with grid codes and operational parameters. This allows DERs to immediately respond to grid conditions and local disturbances without waiting for centralized commands, while still maintaining overall grid coordination through periodic communication with grid operators.
Data Source
AI summary
A grid distribution system aggregates energy resources of multiple distributed energy resources (DERs) and provides service to one or more energy markets with the DERs as a single market resource. The DERs can create data to indicate realtime local demand and local energy capacity of the DERs. Based on DER information and realtime market information, the system can compute how to provide one or more services to the power grid based on an aggregation of DER energy capacity.