The Lynch Foundation will provide grants totaling $2.5 million to schools in Boston with a goal of strengthening principal training and bolstering student performance. The grants, which will be announced Wednesday, will benefit public, charter, and Catholic schools, the foundation said. One grant, totaling $1.5 million, will supply 7 to 15 teachers with yearlong training through the Aspiring Principal Program, part of Boston College’s Lynch Leadership Academy. The remaining $1 million will bring the Achievement Network, a program that has had success improving English and math skills in Boston, to 75 schools over five years. Peter Lynch, the fund manager, started the foundation with his wife, Carolyn, 25 years ago.