Distributed Generation Power Control for Grid Oscillation Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wide-frequency oscillation in power systems due to the integration of power electronic devices leads to device damage, power supply reliability issues, energy yield loss, and power outage, affecting safety and stability, with existing suppression technologies being complex and costly.
Innovation Solution
A power supply system with distributed generations and a detection control unit that adjusts power output proportions based on impedance to suppress oscillation, using power compensation control to stabilize the system without additional devices or circuit changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing wide-frequency oscillation suppression technologies are implemented, then oscillation suppression effect is improved, but system complexity and implementation cost increase
Solution Approach 1:
The distributed generations autonomously adjust their own power output based on impedance information and oscillation detection, without requiring external control devices or complex coordination systems. Each unit serves itself by implementing the control strategy locally, thereby achieving oscillation suppression while minimizing system complexity
Solution Approach 2:
The patent extracts only the essential control function from complex oscillation suppression systems, using simple impedance-based power adjustment rather than implementing full-blown complex control architectures. This extraction achieves oscillation suppression with minimal necessary components
2Reliability
If existing wide-frequency oscillation suppression technologies are implemented, then oscillation suppression effect is improved, but implementation cost increases
Solution Approach 1:
The distributed generations use their existing control capabilities to autonomously implement oscillation suppression, eliminating the need for additional expensive external control devices. Each unit leverages its own resources and capabilities to achieve the suppression function
Solution Approach 2:
The control strategy leverages the existing multi-functionality of distributed generation units, which already possess power conversion and control capabilities for other purposes. These existing capabilities are repurposed for oscillation suppression, avoiding additional implementation costs
3Reliability
If power output proportion of each distributed generation is adjusted based on impedance, then oscillation is suppressed, but power output stability changes
Solution Approach 1:
The power output proportion of each distributed generation is dynamically adjusted based on real-time impedance information and oscillation conditions. The system transitions from static power allocation to dynamic allocation that adapts to changing system conditions, achieving oscillation suppression while maintaining overall stability through controlled variability
Data Source
AI summary
A power supply system includes N distributed generations and at least one detection control unit. The N distributed generations are connected in parallel or in series and then connected to a power grid, and N is an integer greater than 1. The detection control unit is configured to: when detecting that oscillation of the power supply system exceeds a preset threshold range, obtain a power compensation control proportion of each distributed generation based on impedance from each distributed generation to a point of common coupling of the power supply system. The power compensation control proportion is a proportion of power output by each distributed generation to total power output by the power supply system. The detection control unit is further configured to control a power output proportion of each distributed generation based on the power compensation control proportion.