Integrated Volt/VAR Control for Distribution Networks
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Solution Overview
Problem
Traditional power distribution networks face challenges in optimizing voltage and reactive power (VAR) control across entire feeder networks, particularly in microgrids, due to the independent operation of voltage regulators and switched capacitor banks, leading to suboptimal results and increased device wear from frequent switching.
Innovation Solution
Implementing a system that estimates the present state of the network, allocates load zones, predicts load profiles, determines capacitor bank and voltage regulator switching schedules using algorithms like dynamic programming, and adjusts tap settings to flatten voltage profiles and minimize reactive power flow, thereby optimizing volt/VAR control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If voltage regulators and switched capacitor banks are operated as independent devices, then device complexity is reduced, but volt/VAR control optimization across the entire feeder network deteriorates
Solution Approach 1:
The patent merges the control of voltage regulators and switched capacitor banks into a unified coordinated control system. The optimization algorithm simultaneously determines switching schedules for both device types, enabling them to work together as an integrated system rather than independently, thereby achieving optimal volt/VAR control across the entire feeder network.
Solution Approach 2:
The control system performs multiple functions through a single unified algorithm: it optimizes voltage regulation, manages reactive power compensation, coordinates switching schedules, and minimizes line losses. This multi-functional approach replaces multiple independent control systems with one versatile optimization platform.
2Manufacturing precision
If frequent switching is used to maintain optimal voltage and reactive power, then volt/VAR control precision is improved, but device lifespan deteriorates
Solution Approach 1:
The system performs preliminary action by predicting future load profiles and proactively scheduling capacitor bank switching events in advance. The optimization algorithm determines switching schedules based on forecasted load conditions, allowing the system to prepare optimal switching times before actual load changes occur, thereby maintaining precision while reducing unnecessary switching.
Solution Approach 2:
The control system implements periodic action by scheduling capacitor bank switching at optimized intervals based on load profile predictions. Rather than continuous or frequent switching, the system determines specific periodic switching events that maintain optimal volt/VAR control while minimizing the total number of switching operations, thus extending device lifespan.
3Loss of energy
If coordinated control of voltage regulators and capacitor banks is implemented, then line losses are reduced, but computational complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the feeder network into multiple zones and treating voltage regulation and reactive power compensation as separate but coordinated control objectives. The optimization algorithm processes these segmented control tasks independently before integrating their switching schedules, thereby reducing computational complexity while still achieving coordinated optimization that minimizes line losses.
Data Source
AI summary
Certain embodiments of the invention may include systems, methods, and apparatus for controlling voltage and reactive power in a distribution network. One method includes estimating at least one present state associated with a distribution network; allocating one or more load zones in the distribution network; predicting load profiles of each zone for a predetermined time period; determining capacitor bank switching schedules for a predetermined time period based at least in part on the at least one present state and the predicted load profiles; and switching capacitor banks according to the capacitor bank switching schedules.