Volt/Var Optimization in Smart Distribution Systems
Summary
Volt/Var optimisation in smart distribution systems encompasses methods to regulate voltage profiles and reactive power flows across modern electricity networks. The primary aims are to maintain voltage within statutory limits, minimise technical losses and defer costly infrastructure upgrades. With the widespread deployment of distributed energy resources (DERs) such as photovoltaic arrays, battery storage and electric vehicle charging stations, distribution networks have evolved from passive conduits into actively managed grids. Advanced sensors, two-way communications and real-time control platforms enable dynamic adjustment of on-load tap changers, capacitor banks and smart inverters. Solutions range from centralised algorithms that solve nonlinear optimisation problems to decentralised schemes using local measurements and predictive control. Key challenges include uncertainty in renewable generation and load demand, coordination of fast-acting and slow-acting devices, and integration with market mechanisms. Effective Volt/Var schemes deliver global benefits by reducing network losses, improving power quality and facilitating higher penetration of renewables. Practical applications have extended from pilot trials in urban feeders to large-scale deployments, demonstrating energy savings, improved voltage stability and enhanced resilience against contingencies.
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Volt/Var Optimization in Smart Distribution Systems publication trend
The graph below shows the total number of articles in volt/var optimization in smart distribution systems across all publications each year (not limited to Nature Index journals).
Technical terms
Volt/Var optimisation (VVO): A process to balance voltage levels and reactive power flow within distribution networks for efficiency and regulatory compliance.
Distributed energy resource (DER): Small-scale generation or storage units, such as solar panels, batteries or electric vehicle chargers, connected at distribution level.
On-load tap changer (OLTC): A transformer mechanism that adjusts voltage ratios under load by altering winding connections, enabling voltage regulation without interruption.
Model predictive control (MPC): A control methodology that uses a predictive model of the system to optimise future control actions over a finite horizon.
Droop control: A decentralised method in which inverter output adjusts proportionally to local voltage or frequency deviations to share reactive power support.
References
- Offering of active distribution network in real-time energy market by integrated energy management system and Volt-Var optimization. Applied Energy (2024).
- A Support Vector Regression Based Model Predictive Control for Volt-Var Optimization of Distribution Systems. IEEE Access (2019).
- Hierarchical Volt-VAR Optimization Framework Considering Voltage Control of Smart Electric Vehicle Charging Stations Under Uncertainty. IEEE Access (2021).
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