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Transformer-less Unified Power Flow Controller

Transformer-less Unified Power Flow Controller


Energy efficiency

Energy-saving measures are a key approach to reducing greenhouse gas emissions and often offer simultaneous cost-savings. The CTCN collaborates with industries, organisations and research institutions all over the world to bring energy efficiency technology solutions for mitigating climate change. Together with network members we bring technical assistance to countries such as Uganda, Jordan and the Seychelles for formulation of national electricity grid codes, rehabilitation of district heating systems and other technology solutions on national, industry and community level. Below you will find related publications, partners, CTCN technical assistance, technologies and other information for exploring this topic further.  


The ability to store and shift electrical power over time is becoming more important as economies increasingly adopt renewable power sources. Meshed AC power grids have limited controllability and cannot effectively handle congestion of key transmission lines during sporadic peaks and valleys of input power such as that produced by solar and wind sources. Conventional unified power flow controllers (UPFCs) mitigate the congestion problem by balancing the load across transmission lines but require expensive large transformers with high losses. They are also inefficient at handling sporadic power inputs. Michigan State University\'s invention is a transformer-less UPFC. This allows the UPFC to be produced far more cheaply and take up less real estate than conventional UPFCs. In addition it is much more efficient and better suited to handle highly dynamic current power inputs. Applications: Power distribution for load balancing especially where solar and wind supply power. Patent Status: Patent pending


(1) Cheaper than conventional UPFCs (2) Less space required at load-balancing points in the grid (3) Efficient under stable and sporadic power inputs; great for multiple or unpredictable power inputs such as solar and wind energy sources

Date of release: 
Thursday, December 3, 2015
Patent registration information: 

Patent pending