Frequency Converter Grid Fault Control
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Solution Overview
Problem
The increasing reliance on renewable generators, especially wind power installations, in electricity supply grids poses challenges during grid faults due to fluctuating energy output, leading to potential destabilization and reduced support capabilities, as these generators may not be able to contribute effectively to grid stabilization, especially when they are disconnected or experience power fluctuations.
Innovation Solution
A method for controlling electrical consumers, such as charging stations, using frequency converters to monitor and adjust power consumption based on line voltage deviations, ensuring continuous operation during grid faults by maintaining coupling to the grid, adjusting active and reactive power, and utilizing storage units to support grid stability, thereby preventing unwanted load shedding and frequency issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If renewable generators (wind power installations) are used to increase the proportion of renewable energy in the electricity supply grid, then the proportion of renewable generators is improved, but grid stability deteriorates during faults due to fluctuating power output and disconnection
Solution Approach 1:
The patent implements a control method where electrical consumers continuously monitor grid fault conditions and dynamically adjust their power consumption based on real-time grid status. The control unit receives signals about grid faults and modifies the operating state of consumers to maintain grid stability, creating a feedback loop that responds to changing grid conditions
Solution Approach 2:
The patent transforms static electrical consumers into dynamic entities that can adapt their power consumption in response to grid conditions. During grid faults, consumers dynamically reduce or modify their power draw to support grid recovery, enabling the system to transition from rigid to flexible operation
2Object-affected harmful factors
If electrical consumers are disconnected during grid faults to protect them, then consumer safety is improved, but grid stabilization capability deteriorates due to loss of load support
Solution Approach 1:
The patent prepares electrical consumers in advance by equipping them with control units that can detect grid faults and automatically adjust their operation. Instead of reactive disconnection, the system performs preliminary conditioning of consumers to enable them to respond appropriately when faults occur, maintaining both protection and grid support capabilities
Data Source
AI summary
A method for controlling an electrical consumer is provided. The electrical consumer is coupled to an electricity supply grid using a frequency converter. The electricity supply grid has a line voltage and is characterized by a nominal line voltage. The electricity supply grid is monitored for a grid fault in which the line voltage deviates from the nominal line voltage by at least a first differential voltage. When the grid fault occurs, the electrical consumer remains coupled to the electricity supply grid, and a power consumption of the electrical consumer is changed on the basis of the deviation of the line voltage from the nominal line voltage.