Three-Phase Charging Control for Balancing Uneven Phase Currents
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Solution Overview
Problem
In multi-phase installations, such as 3-phase systems, unequal load distribution across phases can occur due to devices not utilizing all phases equally, leading to unbalanced load currents, which can result in inefficient energy delivery and potential grid imbalances.
Innovation Solution
A charging arrangement with a controller that measures and balances load currents across phases by sending control signals to consumers, limiting their current usage to maintain a balanced load, using measurement arrangements to determine and report load currents, and calculating limits based on allowed imbalances to optimize phase usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If devices are connected to only one or two phases of a three-phase installation, then device operation is simplified and easier to implement, but load balance between phases deteriorates
Solution Approach 1:
The charging arrangement incorporates a controller that continuously monitors the load current on each phase and provides feedback signals to consumers. This feedback mechanism enables the system to detect phase imbalances and communicate with connected devices to adjust their current consumption, thereby maintaining load balance while allowing devices to operate on single or dual phases
Solution Approach 2:
The system dynamically changes the current consumption parameter of connected devices based on real-time phase load conditions. The controller adjusts the load current drawn by each consumer according to the overall phase balance requirements, transforming static device operation into adaptive parameter control that responds to system-wide conditions
2Stability of the object's composition
If load current is controlled by limiting consumer current usage, then phase balance is improved, but system flexibility and consumer autonomy deteriorate
Solution Approach 1:
The charging arrangement implements dynamic current limiting where the controller continuously monitors phase loads and adjusts consumer current limits in real-time. This dynamic approach replaces static, fixed current limits with adaptive constraints that change based on system conditions, maintaining phase balance while preserving consumer operational flexibility
Solution Approach 2:
The controller sends preliminary control signals to consumers before potential imbalances occur, or at the early stages of imbalance development. This preliminary action allows consumers to adjust their current consumption proactively, preventing severe phase imbalances while maintaining consumer autonomy through cooperative control
Data Source
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AI summary
The invention relates to a charging arrangement (100) for balancing load currents on multiple phases, the load currents being unbalanced between the phases caused by consumers connected to the phases. The charging arrangement comprises a three-phase current output line L1, L2, L3, with one phase conductor for each phase, and a controller (102). The controller (102) comprises means to control the load current in each of the phase conductors by controlling a consumer and thereby balancing the amount of current between the phase conductors.