Grid Voltage Regulation via Frequency-Driven Transformer Tap Control
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Solution Overview
Problem
The integration of renewable energy sources into power distribution networks has created active networks with bi-directional power flows, challenging traditional voltage regulation methods and leading to inefficiencies and increased costs due to the need for additional generating capacity and frequency stabilization.
Innovation Solution
A system that automatically regulates voltage in response to frequency changes by using sensors to measure system frequency and activate network transformers for load tap changes, thereby stabilizing frequency within operational limits without the need for additional generating plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional voltage regulation methods are used in active networks with bi-directional power flows, then voltage control is maintained, but system efficiency decreases and additional generating capacity is required
Solution Approach 1:
Instead of regulating voltage to maintain constant frequency (traditional approach), the invention inverts the approach by regulating frequency through voltage adjustments. The system responds to frequency deviations by adjusting transformer tap positions to change voltage levels, which then influences power flows and restores frequency to nominal values. This inversion resolves the contradiction by achieving voltage control while improving system efficiency through demand-side voltage regulation rather than supply-side generation adjustments.
2Productivity
If additional generating plants are added to meet peak demand, then power supply capacity increases, but network costs increase
Solution Approach 1:
The invention enables the distribution network to self-regulate frequency and manage peak demand through automated voltage control. When frequency deviations occur, the system automatically adjusts transformer tap positions to modify voltage levels, which influences consumer power consumption and restores frequency balance. This self-service mechanism eliminates the need for additional generating plants to meet peak demand, as the existing infrastructure can dynamically adapt to load variations through intelligent voltage regulation.
Solution Approach 2:
The system changes the voltage parameter dynamically in response to frequency deviations. By adjusting transformer tap positions, the system modifies voltage levels to influence power flows and consumer demand, thereby restoring frequency to nominal values. This parameter change approach allows the network to flexibly respond to varying demand conditions without requiring additional generating capacity or infrastructure.
3Power
If voltage is increased to meet demand, then power delivery capacity increases, but power consumption increases
Solution Approach 1:
The invention implements a feedback control mechanism where frequency measurements trigger voltage adjustments. When frequency deviates from nominal values, the system responds by changing transformer tap positions to adjust voltage levels, which then influences power consumption. This closed-loop feedback ensures that voltage is increased only when necessary to restore frequency balance, rather than continuously maintaining high voltage, thereby avoiding unnecessary power consumption while still meeting demand when required.
Data Source
AI summary
System for controlling voltage supply to a portion of a distribution grid. The portion of the grid includes a substation providing one or more transformers operable to increase or decrease the voltage supplied to consumers within the portion of the grid. The voltage control system providing a data set can include a previously measured power consumption associated with previously measured values of (a) property(ies) for a portion of the grid, the property(ies) being one of voltage, current, frequency or load, or a combination thereof. The voltage control system can provide a measurement device to measure the property(ies) supplied within the portion of the grid. The voltage control system can provide a processing device to determine from the previously measured values of the property(ies) in the data set a most likely effect of altering the value of the property(ies) from a first value to a second value, on the power consumption.