Improving power flow in transformers using a BTB converter to balance low voltage feeders

This paper proposes a method to balance the power of transformers in low voltage distribution by using the Back-to-Back (BTB) converter. Through the exchange of active power and the compensation of reactive power between feeders, the overloading of transformers is avoided. In the proposed method, the load is considered as a variable that is constantly changing. The control structure is designed in the dq frame of reference and classical theory is employed. A test system composed by two 50kVA transformers supplying several loads is used to validate the efficacy of the method. For simulations a 30kVA BTB converter is used, and for experimental results a 10∶1 BTB converter is implemented.