AI Reactive Power Controller for Grid Voltage Sags
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Solution Overview
Problem
Conventional fault ride-through mechanisms in grid-connected distributed generation systems fail to ensure stable operation during voltage disturbances, leading to unwanted disconnections and instability in both utility and distributed generation networks.
Innovation Solution
An artificial intelligence-based reactive power control system is introduced, which includes a utility grid, a 3-phase grid circuit breaker, a distributed generation circuit, a voltage and current measurement unit, an intelligent low voltage ride-through detector, and an intelligent reactive power controller. This system monitors and controls the operation of a grid-connected photovoltaic inverter system by identifying low voltage ride-through status and adjusting active and reactive power references to maintain grid stability during voltage sags and reductions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fault ride-through mechanisms are used, then the system structure is simple, but the system fails to ensure stable operation during voltage disturbances leading to disconnections and instability
Solution Approach 1:
An artificial intelligence-based reactive power controller is introduced as an intermediary component between the distributed generation unit and the grid. This controller uses intelligent algorithms to detect voltage disturbances and dynamically adjust reactive power compensation, thereby ensuring stable operation during voltage sags without requiring complex structural changes to the overall system architecture.
Solution Approach 2:
The system dynamically changes the reactive power parameter in response to detected voltage disturbances. By adjusting the reactive power output of the distributed generation unit based on real-time grid conditions, the system maintains stability during voltage disturbances while keeping the structural configuration relatively simple.
2Reliability
If the system monitors and dynamically controls reactive power during voltage disturbances, then grid stability is improved, but the control system complexity increases
Solution Approach 1:
The control system implements continuous feedback monitoring of grid voltage conditions and dynamically adjusts reactive power output accordingly. This closed-loop control mechanism detects voltage sags in real-time and automatically compensates by adjusting the reactive power of the distributed generation unit, thereby maintaining grid stability through intelligent, adaptive control rather than complex hardware modifications.
3Reliability
If the system provides low voltage ride-through control, then disconnection during voltage sags is prevented, but the requirement for intelligent detection and control increases system complexity
Solution Approach 1:
The system pre-configures the reactive power controller to automatically activate upon detection of voltage sags. By having the control mechanism ready in advance and using straightforward voltage threshold detection, the system can quickly respond to disturbances without requiring complex real-time analysis or measurement systems, thus preventing disconnections while maintaining relatively simple detection requirements.
Data Source
AI summary
An artificial intelligence reactive power control system for low voltage ride-through in a grid connected distributed generation network includes a grid, a circuit breaker, a distributed generation circuit including 3-phase terminals, and a voltage and current measurement unit connected to the 3-phase terminals and configured to generate a set of measured variables. An intelligent low voltage ride-through detector receives the set of measured variables and identifies a low voltage ride-through status of the utility grid. An intelligent reactive power controller receives a low voltage ride-through status signal from the intelligent low voltage ride-through detector and controls a low voltage ride-through during a grid voltage sag and a voltage reduction by transmitting one or more of an active power reference and a reactive power reference value to the distributed generation circuit based on the low voltage ride-through status signal.