Converter Infeed Control for High-Penetration Grid Fault Stability
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Solution Overview
Problem
Existing strategies for converter-controlled infeed apparatuses in electrical supply networks, particularly those with high converter pervasion, are not adequately adapted to handle network faults and dynamics, especially in scenarios with varying synchronous machine distributions and network conditions, leading to potential instability and inefficiencies.
Innovation Solution
A method for feeding electrical power into an electrical supply network using converter-controlled infeed apparatuses, such as wind or photovoltaic installations, which involves controlling the magnitude and phase of the current fed into the network, with infeed control strategies that account for network state, including voltage, frequency, and fault conditions, and characterizing local network sections based on converter pervasion and connectivity to neighboring sections to optimize power distribution and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If converter-controlled infeed apparatuses are used to feed electrical power into the electrical supply network, then the proportion of conventional infeed apparatuses with directly coupled synchronous generators declines and converter technology is adopted, but the adaptability to network faults and dynamics deteriorates in networks with high converter pervasion
Solution Approach 1:
The patent applies dynamics by making the control strategy adaptive and changeable based on network conditions. The infeed control is configured to detect network state (voltage, frequency, fault conditions) and dynamically adjust control parameters such as current magnitude and phase, enabling the converter-controlled infeed apparatus to adapt to varying network conditions including faults and high converter pervasion scenarios
Solution Approach 2:
The patent changes control parameters based on network state detection. The infeed control modifies current magnitude, phase angle, and other electrical parameters dynamically in response to detected network conditions, allowing the system to maintain stability and adaptability across different operating scenarios including network faults and high converter penetration
2Reliability
If existing FRT strategies are applied in networks with high converter pervasion, then ride through capability is provided, but the strategies become unsuitable and lead to problems due to varying synchronous machine distributions
Solution Approach 1:
The patent makes the FRT strategy dynamic by continuously detecting network state including voltage, frequency, and fault conditions, then adapting control parameters in real-time based on the detected conditions and the actual synchronous machine distribution in the network section, rather than applying fixed pre-configured strategies
Solution Approach 2:
The patent implements feedback mechanisms where the infeed control continuously monitors network state and uses this information to adjust control actions. The control system detects network conditions and feeds this information back to modify current magnitude, phase, and other parameters, creating a closed-loop system that adapts to varying network configurations and maintains suitability across different scenarios
3Productivity
If converter-controlled infeed apparatuses operate in networks with high converter pervasion, then modern infeed technology is utilized, but stability and efficiency of power distribution deteriorate without adapted control strategies
Solution Approach 1:
The patent optimizes power distribution by dynamically changing control parameters including current magnitude, phase angle, and reactive power injection based on detected network state. This parameter adaptation enables the converter-controlled infeed apparatus to maintain high efficiency while ensuring stability in networks with high converter pervasion
Solution Approach 2:
The patent employs feedback control where the infeed control continuously monitors network state (voltage, frequency, fault conditions) and adjusts control parameters accordingly. This closed-loop approach ensures both high productivity through optimized power transfer and high reliability through stability maintenance under varying network conditions
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 approach enhances the stability and efficiency of power distribution in networks with high converter pervasion by dynamically adjusting power input based on network conditions, ensuring stable operation and effective handling of faults, even in complex network configurations.
Implementation Method 1
The converter-controlled infeed apparatus feeds electrical power into the electrical supply network by means of at least one converter. The at least one converter can control magnitude and phase of a current fed in.
Data Source
AI summary
Provided is a method for feeding electrical power into an electrical supply network using a converter-controlled infeed apparatus. The apparatus feeds into a local network section of the electrical supply network at a network connection point. The network has further infeed apparatuses and consumers for consuming electrical power. The local section has a ratio of power able to be fed in using converters to a total power able to be fed in by all infeed apparatuses of at least 50%. A controller controls the infeed of the electrical power depending on a network state of the network. The controller has control behavior that depends on a network characteristic of the local section. The network characteristic is dependent on at least one property of the local section and at least one property of a further network section of the network or a determination that no further network section is present.