HSBC Infrastructure, an investor in public-private projects, said its portfolio is performing well and has been largely unaffected by the economic crisis.After recently acquiring two Scottish Schools private finance initiative (PFI) projects for £23.6m, it now has 30 infrastructure investments, 29 of which are PFI or public-private partnership (PPP) projects."Despite the continued uncertainty in the global economy and the volatility of the financial markets, the board and the investment adviser remain confident that the group will achieve the company's target of progressive dividend growth," the firm said.It expects to make further acquisitions in coming months.