Grid Frequency Control Using Energy Storage Power Injection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing power grids face challenges in maintaining frequency stability due to imbalances between power generation and load, which are exacerbated by the slow response of speed governors and limited system inertia, leading to potential equipment failure and system collapse.
Innovation Solution
An energy storage device (ESD) with a controller and energy conversion system is used to inject electrical energy into the grid to balance generation and load, with a controller managing the injection based on frequency deviations and remote commands to stabilize frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If speed governor is used to regulate power output, then power balance between generation and load is maintained, but response speed is slow due to mechanical constraints
Solution Approach 1:
The patent replaces the mechanical speed governor system with an energy storage device controlled by a controller that receives frequency deviation signals and adjusts power injection accordingly. This substitution eliminates mechanical response delays while maintaining the function of balancing generation and load through electrical control mechanisms.
Solution Approach 2:
The patent introduces an energy storage device as an intermediary between the power grid and the load/generation system. This intermediary可以快速 respond to frequency deviations by injecting or absorbing power, thereby improving response speed while the controller acts as a mediator to coordinate the power flow based on grid conditions.
2Reliability
If power reserve capacity is maintained to compensate for generation failures, then grid reliability is improved, but operational cost increases due to idle reserve resources
Solution Approach 1:
The patent transforms the static power reserve system into a dynamic energy storage system that can rapidly adjust its power injection or absorption based on real-time grid frequency conditions. The energy storage device charges when power is abundant and discharges when power is needed, eliminating the need for continuously idle reserve generation capacity while maintaining grid reliability.
Solution Approach 2:
The patent changes the operational parameters of reserve capacity from a static state (continuous idle generation at fixed output levels) to a dynamic state (energy storage cycling between charge and discharge modes). This parameter change allows the system to provide reserve capacity only when needed, reducing operational costs while maintaining reliability through rapid response capability.
3Stability of the object's composition
If system inertia is increased to buffer energy imbalances, then frequency stability is improved, but system complexity and cost increase due to additional generation capacity
Solution Approach 1:
The patent replaces the traditional mechanical inertia provided by large rotating generator masses with an electrochemical or electrical energy storage system. The energy storage device provides frequency stability through rapid electrical response rather than mechanical rotor inertia, significantly reducing system complexity and cost while achieving the same frequency buffering function.
Solution Approach 2:
The patent changes the mechanism of inertia from mechanical mass to electrical energy storage capacity. By altering the fundamental parameter from physical mass to stored energy, the system achieves frequency stability without requiring additional generation capacity or complex mechanical structures, thereby reducing system complexity.
Data Source
AI summary
A controller for controlling an energy discharge from an energy saving device to a power grid. The system includes decision logic to implement a local response responsive to events currently occurring in a power grid and in addition remote commands sent from a remote location.