Electrical Energy Transmission, Networks and Systems
Summary
The global electricity supply rests on an intricate network of generation facilities, high-voltage transmission corridors and downstream distribution grids. Alternating-current (AC) systems dominate long-distance transmission, aided by transformers that step voltages to minimise losses, while direct-current (DC) links—notably high-voltage direct current (HVDC) interconnectors—offer precise flow control and efficient bulk transfer over very long spans or between asynchronous regions. At medium and low voltages, hybrid AC/DC schemes are emerging to accommodate distributed renewables, storage and power-electronic interfaces. Across all levels, system operation must balance generation and demand instantaneously, manage active and reactive power flows and preserve stability under varying conditions. Modern networks deploy flexible AC transmission system (FACTS) devices, voltage-source converters (VSCs) and modular multilevel converters (MMCs) to regulate voltages, damp oscillations and provide ancillary services. The transition towards more decentralised generation, bi-directional flows and smart-grid control presents challenges in planning, fault ride-through, power quality and real-time coordination across AC and DC domains.
Research from Nature Portfolio
A multi-resource dynamic coordinated planning framework has been developed for flexible distribution networks equipped with controllable interconnections. By embedding soft open points into a probabilistic model of source-load uncertainties, planners can trade off investment cost against the risk of voltage violations and line overloads. Case studies demonstrate that tuning acceptable violation probabilities yields substantial savings compared to traditional reinforcement approaches, while accommodating high penetrations of distributed generation.
An experimental study on hybrid AC/DC microgrids has introduced a modulated-unified power quality conditioner and a switched-inductor boost converter to improve both AC harmonics and DC-link performance. By optimising inverter control parameters with evolutionary algorithms, the system achieves significant reduction in voltage distortion under static and dynamic disturbances, highlighting the role of coordinated controllers in maintaining power quality in islanded operation.
A rigorous time-domain integral-equation method has been formalised for three-dimensional conductors that include radiation effects. By coupling retarded scalar and vector potentials with passive lumped-parameter circuits, the approach yields stable broadband transient simulations of complex network geometries. Demonstrations on canonical layouts confirm its suitability for co-simulating power-electronic converters and transmission components with full electromagnetic fidelity.
Electrical Energy Transmission, Networks and Systems publication trend
The graph below shows the total number of articles in electrical energy transmission, networks and systems across all publications each year (not limited to Nature Index journals).
Technical terms
Hybrid AC/DC distribution system: A network combining alternating-current and direct-current feeders and converters to serve diverse generation and load types.
Voltage-source converter (VSC): Power-electronic device that converts between AC and DC while providing fast voltage and reactive-power control.
Soft Open Point (SOP): Power-electronic insertion at a normally open point in a distribution feeder enabling controllable exchange of active and reactive power.
Modular multilevel converter (MMC): A scalable converter topology comprising cascaded submodules for high-efficiency DC links with low harmonic distortion.
Reactive power: Component of AC power that does no net work but supports voltage levels and magnetic fields in inductive or capacitive elements.
Hosting capacity: The maximum level of distributed generation integration without violating network operational limits.
References
- The Future of Generation, Transmission, and Distribution of Electricity.
- Multi-resource dynamic coordinated planning of flexible distribution network. Nature Communications (2024).
- Improvement of power quality parameters using modulated-unified power quality conditioner and switched-inductor boost converter by the optimization techniques for a hybrid AC/DC microgrid. Scientific Reports (2022).
- The time domain numerical method of three-dimensional conductors including radiation with lumped parameter circuit. Scientific Reports (2021).
- Towards medium voltage hybrid AC/DC distribution Systems: Architectural Topologies, planning and operation. International Journal of Electrical Power & Energy Systems (2024).
- Flexible and Economic Dispatching of AC/DC Distribution Networks Considering Uncertainty of Wind Power. IEEE Access (2019).
- Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters. International Journal of Electrical Power & Energy Systems (2017).
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