It included the Offshore Patrol Vessel HMNZS Otago with about 75 crew to assist with maritime security, a P-3 Orion detachment with 20 personnel to provide aerial surveillance, and up to 30 Special Operation Forces personnel to provide support to Papua New Guinea security forces on the ground in Port Moresby.
Australia has already deployed roughly 1500 defence personnel, two patrol boats and air force jets for the event.
Peters said New Zealand was also providing assistance for diplomatic training and other areas requested by PNG, like ambulance operations.
Prime Minister Jacinda Ardern will be among the world leaders attending the gathering at Port Moresby, where security and logistics have been a major headache.
Papua New Guinea is rife with violent crime including armed robbery, carjacking and sexual assault. Settlement areas in urban centres, including Port Moresby, are considered particularly dangerous.