Grid Frequency Control via Forecast-Driven Power Unit Coordination
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Solution Overview
Problem
Existing methods for controlling grid frequency are inadequate in responding quickly and effectively to sudden changes, particularly in small grids, and are often uneconomical or inflexible, leading to potential damage from frequency deviations.
Innovation Solution
A control system that uses a Control Node to monitor grid frequency and generate control instructions for power units to adjust their consumption or provision, utilizing a network of power unit controllers to coordinate a grid-wide response, allowing for timely and tailored adjustments to maintain nominal frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If generators are run at reduced capacity to provide frequency response, then frequency stability is improved, but productivity decreases
Solution Approach 1:
The system performs preliminary action by forecasting frequency variations before they occur and pre-positioning power units to provide frequency response. This allows the system to maintain frequency stability without running generators at reduced capacity, as the response is prepared in advance based on predictions rather than reactive adjustments.
Solution Approach 2:
The system implements feedback by continuously monitoring actual frequency variations and comparing them with forecasted values. Based on this feedback, the system adjusts the operation of power units to provide appropriate frequency response, optimizing both frequency stability and power output rather than operating at fixed reduced capacity.
2Speed
If local devices monitor and react to frequency changes, then response time is improved, but adaptability decreases
Solution Approach 1:
The system introduces an intermediary layer (the frequency response management system) that receives forecasts and actual frequency data, processes this information centrally, and coordinates responses from multiple power units. This intermediary enables both rapid local response and flexible centralized coordination, overcoming the limitations of purely local devices.
Solution Approach 2:
The system achieves universality by enabling power units to serve multiple functions: they operate as generation assets while also providing frequency response services. The coordinated control system allows these same power units to respond flexibly to different frequency scenarios based on forecasts and actual conditions, rather than being limited to fixed local responses.
3Reliability
If generators respond to frequency changes within a few seconds, then frequency stability is improved, but loss of time increases for particularly sudden events
Solution Approach 1:
The system applies preliminary action by forecasting frequency variations in advance and pre-positioning power units to respond immediately when needed. For sudden events, the forecasted response is already prepared, eliminating the delay associated with detecting and responding to frequency changes after they occur.
Solution Approach 2:
The system implements skipping by bypassing the traditional sequence of detecting frequency deviation and then responding. Instead, the forecast-driven approach allows the system to rush through to immediate response by having control actions pre-determined based on predicted frequency variations, reducing the time loss for sudden events.
Data Source
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AI summary
Control systems and methods for control of grid frequency in an electric power grid, are described. A grid frequency is monitored by monitoring devices (120) at one or more predefined locations in the grid, and a determination is made whether one or more conditions relating to the monitored frequency have been met. A control period during which the grid frequency at one or more of the one or more predefined locations is to be controlled is initiated based on the determination. One or more variation characterises relating to a variation, during the control period, in grid frequency are determined. Control instructions, comprising instructions to control power flow to and/or from each of a first plurality of power units (119) so as to control the monitored frequency, are sent. The control instructions are generated on the basis of profile information relating to the power units and the determined one or more variation characteristics.