Converter Feed-In Control Based on Grid Converter Share
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Solution Overview
Problem
The increasing proportion of converter-controlled feed devices in electrical supply networks creates instability due to their fast regulation, reducing the stabilizing effect of synchronous generators and complicating voltage support, as they operate differently and are often decentralized.
Innovation Solution
A method to estimate the converter share in a network section and adjust power feeding based on this estimation, allowing converter-controlled feed devices to emulate synchronous generator behavior and enhance network stability by controlling frequency and voltage support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If converter-controlled feed-in devices are used to feed electrical power into the network, then power feed-in capability is improved, but network stability deteriorates due to fast regulation creating instability
Solution Approach 1:
The control characteristics of the converter-controlled feed-in device are dynamically adapted based on the detected converter share in the network section. When a high converter share is detected, the control system adjusts parameters such as response time, damping factors, and control gains to compensate for the reduced natural inertia, thereby maintaining network stability while preserving full power feed-in capability.
Solution Approach 2:
The invention changes control parameters (e.g., proportional and integral gains, response time constants) based on the detected converter share. By adjusting these parameters dynamically, the system compensates for the destabilizing effect of high converter proportions and maintains stable network operation despite the fast regulation characteristics of converters.
2Adaptability or versatility
If converter-controlled feed-in devices replace synchronous generators, then adaptability to network conditions is improved, but voltage support capability deteriorates due to current-stabilizing vs voltage-stabilizing operation
Solution Approach 1:
The invention dynamically switches between current-stabilizing and voltage-stabilizing control modes based on the detected converter share and network conditions. When synchronous generators are prevalent, voltage-stabilizing mode provides strong voltage support. When converters dominate, the system adapts by adjusting reactive power control characteristics to compensate for the weakened voltage support, maintaining reliable operation across different network configurations.
3Productivity
If converter-controlled feed-in devices are deployed rapidly, then power generation capacity is improved, but control system complexity increases due to need for converter share detection and adaptation
Solution Approach 1:
The converter-controlled feed-in device autonomously detects the converter share in its network section by monitoring frequency response characteristics and automatically adapts its control parameters without external intervention. This self-service approach eliminates the need for complex manual configuration or centralized control systems, keeping the control system relatively simple while enabling rapid deployment and scaling of power generation capacity.
Data Source
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AI summary
The invention relates to a method for supplying electric power to an electric supply network (320), which has a network voltage (U) with a network frequency (f) with a network nominal frequency, by means of a converter-controlled supply device (300), in particular by means of a wind park (112) or a wind turbine (100). The supply device for supplying the electric power supplies a supply current (I) in the form of an electric alternating current (I) with a frequency, phase (φ), and a supply voltage (U), and at least one of the variables from the list containing the frequency (f) of the supply current (I), phase (φ) of the supply current (I), supplied power, and supply voltage (U) can be adjusted. The method has the steps of estimating a converter component of a network section of the electric supply network (320), wherein the converter section specifies a ratio of power supplied by the converter to the power supplied in total, and controlling the supply of the electric power depending on the estimated converter component.