Variable-Speed Wind Generator Frequency Control via Rotor Speed Gain
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Solution Overview
Problem
Variable-speed wind power generators with high wind power penetration levels face challenges in maintaining system frequency due to fluctuating output, leading to difficulties in frequency control, and existing solutions with additional energy storage devices are economically inefficient.
Innovation Solution
A system and method for frequency control of variable-speed wind power generators that incorporate a maximum output control loop and a frequency deviation loop, where the gain is varied based on rotor speed, allowing for optimized frequency regulation without additional energy storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional energy storage devices are installed to smooth output, then frequency control performance is improved, but system cost and device complexity increase
Solution Approach 1:
The patent extracts the frequency control function from the mechanical energy storage system and implements it through software-based control algorithms in the maximum output control loop and frequency deviation loop, eliminating the need for additional physical energy storage devices while maintaining frequency stabilization capability
Solution Approach 2:
The wind power generator uses its own kinetic energy and control systems to provide frequency regulation services by adjusting rotor speed and output power dynamically, rather than relying on external energy storage infrastructure
2Productivity
If wind power penetration level is increased, then renewable energy utilization is improved, but system inertia decreases and frequency stability deteriorates
Solution Approach 1:
The patent implements dynamic control by continuously adjusting the maximum output control loop gain and frequency deviation loop gain based on real-time rotor speed conditions, allowing the wind power generator to adaptively provide frequency support that compensates for the reduced system inertia caused by high renewable penetration
Solution Approach 2:
The frequency deviation loop uses feedback from system frequency measurements to generate corrective control signals that adjust the wind power generator output, creating a closed-loop control system that actively maintains frequency stability despite variable wind conditions and reduced system inertia
3Reliability
If output evaporation rate is limited or obliging frequency control participation is required, then system frequency stability is improved, but wind farm operational flexibility and productivity decrease
Solution Approach 1:
The patent changes the control parameters (gains) of the maximum output control loop and frequency deviation loop based on rotor speed conditions, enabling the wind power generator to dynamically adjust its output characteristics to provide frequency support while maintaining operational flexibility and avoiding arbitrary output limitations
Data Source
AI summary
A system for and a method of frequency control of a variable-speed wind power generator are proposed. According to an implementation example of the present technology, there is an advantage in which the present technology may be involved in a frequency control of the system, thereby stabilizing the frequency of the system by controlling the frequency of the variable-speed wind power generator on the basis of a gain being varied according to a speed of a rotor.