Power System Stabilization Control via Oscillation Priority
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Solution Overview
Problem
The increasing integration of renewable energy sources like solar and wind power into power systems leads to unpredictable output fluctuations, destabilizing wide-area power systems and making it challenging to achieve high-speed and precise stabilization control, especially when generators are installed close together.
Innovation Solution
A system stabilization control device that uses measurement information from multiple points within the power system to determine control priorities, calculate destabilization times, and set control times for stabilizing instruments, enabling high-speed and precise stabilization by selecting the appropriate control targets and timing for stabilization actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If renewable energy sources (solar, wind) are integrated into power systems, then power generation capacity is increased, but output fluctuations occur that destabilize the system
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring oscillation characteristics (frequency, amplitude, damping ratio) from multiple measurement points in the power system. Based on this real-time feedback, the system automatically determines control priorities and executes stabilization actions. The feedback loop includes: (1) acquiring oscillation information from PMUs at multiple points, (2) calculating oscillation characteristics, (3) determining control priorities based on these characteristics, and (4) executing control actions, which then feed back into the system to modify oscillation behavior.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and preparing control strategies before actual system instability occurs. The system continuously monitors oscillation characteristics and pre-determines control priorities for different generators and control instruments. When oscillation parameters indicate potential instability, the system has already prepared the appropriate control actions (such as adjusting excitation systems or governor settings) to be executed immediately, preventing full-scale instability rather than reacting after it occurs.
2Quantity of substance
If generators are installed close together in adjacent regions, then power source capacity is increased, but oscillation instability occurs more frequently
Solution Approach 1:
The patent segments the power system into multiple analysis zones by selecting several measurement points (PMU locations) distributed across different regions of the power system. Each measurement point independently monitors local oscillation characteristics, and the system processes information from each segment separately. This segmentation allows the control system to identify and address oscillation issues in specific regions without requiring system-wide control actions, improving reliability while maintaining high power source capacity through localized control.
3Productivity
If control actions are delayed, then system response time is reduced, but destabilization occurs leading to wide-area power failures
Solution Approach 1:
The patent dynamically changes control parameters (control priority levels, control instrument selections, and control action magnitudes) based on real-time oscillation characteristics. The system calculates oscillation parameters (frequency, amplitude, damping ratio) and adjusts control strategies accordingly. When oscillation amplitude increases or damping decreases, the system automatically escalates control priority and modifies control parameters to achieve faster stabilization. This dynamic parameter adjustment enables rapid response (improving productivity) while adapting to varying stability conditions (maintaining reliability).
Data Source
AI summary
A system stabilization control device controls a control instrument within a power system on the basis of measurement information from a plurality of measurement points within the power system. The system stabilization control device includes an equipment information database storing information of system equipment interconnected with the power system; a control priority determining unit determining the control priority of the control instrument on the basis of the information of the system equipment; a control target determining unit determining a control target on the basis of the measurement information from the plurality of measurement points and the control priority; a destabilization time calculating unit calculating destabilization time of the power system from the measurement information from the plurality of measurement points; and a control time determining unit determining control time of the control instrument on the basis of the destabilization time and the information of the system equipment.