The bank said it had offered $40 million and sold $38.4 million at a cut-off price of 7.5301 pounds per dollar, unchanged from its last auction held on Monday.
The central bank has now kept the official exchange rate steady for more than a month after letting the pound weaken in an effort to wipe out black-market trading.
Black-market traders said trade had fallen dramatically because of this step and due to a cap imposed by the central bank in February on the amount of dollars that could be deposited in banks.
The limit on deposits discourages use of the black market by depriving those who want to exchange dollars outside official channels of a place to keep their funds.
One trader said the dollar was selling for 7.70 pounds on the black market on Wednesday, weaker than the rate of 7.63 quoted on Monday after the last central bank dollar auction.
The rates at which banks are allowed to trade dollars are determined by the results of central bank sales, giving the bank effective control over official exchange rates.