An innovative method based on optimal injection current is introduced to calculate reactive compensation capacity during unbalanced three-phase distribution transformer operation. This method offers a new process that governs the three-phase unbalanced distribution transformers compared with susceptance compensation and calculates the operation capacity of the reactive power compensation electric control equipment through reverse thinking. Compensation effect is further optimised by adding reasonable restrictive conditions and neglecting inductive compensation combined with practical electrical engineering computing. This study presents the calculation method of optimal injection current with pure capacitive reactive power control along with its basic principles, algorithm implementation, and practical analysis. Results show that calculation based on optimal injection current avoids the overcompensation and overcurrent of susceptance compensation while improving the governance of the unbalanced three-phase distribution transformer effect.

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Innovative calculation method of inductive reactive compensation capacity based on optimum injection current

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