Hybrid Plant Grid Segmentation for Wind-Driven Frequency Stability
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Solution Overview
Problem
Hybrid power plants face challenges due to volatile wind energy generation leading to fluctuating electrical power, causing malfunctions and requiring costly overdimensioned electrical stores and sophisticated control strategies in gas production installations.
Innovation Solution
An electrical grid with two distinct sections: a first section for power transportation with a wide frequency range and a second section for voltage-and/or frequency-sensitive auxiliary devices with a narrow frequency range, connected via a grid converter, allowing for robust and cost-effective operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electrical grid section is used for both power transportation and auxiliary devices, then the system structure is simple, but the frequency stability for sensitive devices deteriorates due to wind power fluctuations
Solution Approach 1:
The electrical grid is divided into two distinct grid sections: a first grid section for power transportation with wide frequency tolerance, and a second grid section for auxiliary devices with narrow frequency range. This segmentation allows each section to be optimized for its specific function, resolving the contradiction between structural simplicity and frequency stability.
Solution Approach 2:
A frequency conversion device is introduced as an intermediary between the two grid sections. This device converts frequency between the first and second grid sections, enabling the first section to handle wind power fluctuations while the second section maintains stable frequency for sensitive auxiliary devices.
2Reliability
If overdimensioned electrical stores and sophisticated control strategies are used to counteract wind volatility, then the frequency stability is improved, but the cost increases significantly
Solution Approach 1:
By segmenting the grid into two sections with different frequency characteristics, the system achieves frequency stability for auxiliary devices without requiring expensive overdimensioned electrical stores or sophisticated control strategies. The first section absorbs wind volatility while the second section maintains stable operation.
Solution Approach 2:
The system changes the frequency parameter characteristics of different grid sections - the first section operates with wide frequency tolerance to absorb fluctuations, while the second section operates with narrow frequency range for stability. This parameter differentiation provides cost-effective frequency stability.
3Adaptability or versatility
If the first grid section operates with wide frequency range to absorb wind fluctuations, then the adaptability to wind volatility is improved, but the frequency stability for auxiliary devices deteriorates
Solution Approach 1:
The grid is segmented into two sections with different frequency characteristics. The first grid section is designed for wide frequency range to adapt to wind fluctuations, while the second grid section maintains narrow frequency range for stability. This segmentation allows both adaptability and stability to coexist in different parts of the system.
Solution Approach 2:
The frequency conversion device acts as an intermediary that decouples the frequency characteristics of the two grid sections. It allows the first section to operate with wide frequency range for adaptability while the second section operates with narrow frequency range for stability, transferring frequency as needed.
Data Source
AI summary
In one aspect, an electrical grid for an isolated hybrid power plant includes a first grid section configured to be connected to at least one wind power installation, be connected to at least one gas production installation, and transport an electrical power generated by the wind power installation to the at least one gas production installation; a second grid section configured to be connected to the at least one gas production installation; and a grid converter configured to electrically connect the first grid section and the second grid section to one another and bidirectionally exchange electrical power between the first electrical grid section and the second electrical grid section.