Synchronous Machine Grid Frequency Stabilization
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Solution Overview
Problem
Wind turbines and other power generation units connected to utility grids face challenges in providing frequency stabilization and grid compliance due to the lack of inherent inertia response, leading to frequency deviations and reduced transparency in their operation.
Innovation Solution
A power generation system comprising a power generation unit interfaced with a synchronous machine and a grid measurement device, where the output power is adjusted based on measured current and power flow to stabilize the grid frequency, combining the inertia response of synchronous generators with controllable output power for effective frequency stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power generation units use power electronics to interface with the utility grid, then adaptability to different grid conditions is improved, but frequency stability deteriorates due to loss of direct link between power and frequency
Solution Approach 1:
The patent introduces a synchronous machine as an intermediary device between the power generation unit and the utility grid. This synchronous machine maintains a direct mechanical-coupled link to the grid, preserving the natural inertia response and frequency stability while allowing the power generation unit to use power electronics for adaptable power conversion and control.
2Ease of operation
If wind turbine generators use power electronic inverters to interface with the utility grid, then ease of operation is improved, but transparency to system operators deteriorates creating a black box effect
Solution Approach 1:
The synchronous machine acts as a transparent intermediary that maintains a direct, observable mechanical connection to the grid. This allows system operators to see and measure the direct relationship between mechanical power input and electrical power output, eliminating the black box effect while preserving the operational flexibility provided by power electronics.
3Device complexity
If wind turbine generators traditionally respond to grid requirements through internal controllers, then device complexity is reduced, but frequency stabilization capability deteriorates
Solution Approach 1:
The synchronous machine serves as a dedicated intermediary component specifically for frequency stabilization. It provides the inherent inertia response and direct frequency support capability that internal controllers of power generation units cannot provide, while the overall system complexity remains manageable through the clear functional separation between the power conversion system and the frequency support system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables fast and efficient stabilization of grid frequency, providing inertia response even in low wind scenarios, and enhances transparency for system operators, making it attractive for replacing conventional power plants.
Implementation Method 1
at least one synchronous machine that is operated in parallel to the power generation unit
Implementation Method 2
The power generation unit is interfaced to the utility system using a power converter
Data Source
AI summary
A power generation system is provided. The power generation system including a power generation unit operable to supply electrical power to an utility system; a synchronous machine coupled to the utility system; a grid measurement device arranged for measuring the current and power that is exchanged between the synchronous machine and the utility system; a controller for adjusting the output power of the power generation unit as a function of the power and current that is measured by the grid measurement device; and a communication link between the grid measurement device, controller and/or the power generation unit. The power generation unit is configured to provide current and power to the utility system as a function of the power and current that is measured by the grid measurement device.