AVC Substation Reactive Power Control with Dynamic Capacitor Switching
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Solution Overview
Problem
Existing AVC substation control strategies fail to maintain reactive power balance and energy efficiency when the 10 kV bus voltage exceeds limits, leading to capacitor disconnection and increased power grid loss.
Innovation Solution
A method and system that determine reactive integrated electric quantity, 10 kV bus voltage qualification, power factor, and reactive power demand to strategically deploy capacitors for on-site balance control, ensuring voltage and power factor compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing AVC substation control strategy is used when voltage exceeds limits, then the capacitor is cut off to protect equipment, but reactive power balance is lost and power grid loss increases
Solution Approach 1:
The system performs preliminary assessment of voltage qualification status and reactive power demand before making capacitor control decisions. By evaluating whether voltage is within qualified range and whether reactive power demand is genuine, the system prepares appropriate control strategies in advance, avoiding premature capacitor disconnection and maintaining reactive power balance even when voltage temporarily exceeds limits
Solution Approach 2:
The system continuously monitors voltage, reactive power, and power factor parameters, and uses this feedback to dynamically adjust capacitor control decisions. The multi-step determination process (checking voltage qualification, reactive power demand, power factor) creates a closed-loop feedback mechanism that adapts to real-time grid conditions, preventing energy loss while maintaining equipment safety
2Loss of energy
If the capacitor is continuously connected to maintain reactive power balance, then power grid loss is reduced, but voltage quality may deteriorate when reactive power exceeds limits
Solution Approach 1:
The system dynamically adjusts capacitor connection status based on real-time assessment of multiple parameters including reactive integrated electric quantity, voltage qualification status, power factor, and reactive power demand. This dynamic control strategy allows the capacitor to be connected when beneficial for energy efficiency and disconnected when necessary for voltage quality, optimizing the trade-off between power grid loss and voltage quality
Solution Approach 2:
The system changes the operational parameters (connection status) of the capacitor based on changing grid conditions. By monitoring parameters such as reactive integrated electric quantity exceeding set values, voltage qualification status, and power factor deviations, the system adjusts capacitor operation to maintain both energy efficiency and voltage quality under different operating conditions
3Loss of energy
If the AVC substation optimizes reactive power distribution, then power grid loss is reduced, but the control strategy complexity increases
Solution Approach 1:
The control strategy is segmented into distinct determination steps: first checking if reactive integrated electric quantity exceeds set values, then checking voltage qualification status, then checking power factor, and finally determining reactive power demand. This segmentation breaks down the complex optimization problem into manageable sequential decisions, making the control strategy more implementable while achieving energy loss reduction
Data Source
AI summary
A control method and system for automatic voltage control (AVC) substation reactive power optimization assistance are provided, and belong to the technical field of electric power system operation control. The method includes: determining whether a reactive integrated electric quantity of a main transformer step-down switch of a substation exceeds a set value of reactive integrated electric quantity of the main transformer step-down switch; if yes, determining whether voltage of a 10 kV bus of the substation is qualified; if yes, determining whether a power factor of a transformer step-down switch is greater than a power factor set value of the main transformer step-down switch; if yes, determining whether a reactive power demand of the substation is true; and if yes, putting a capacitor into use to perform reactive on-site balance control.