Elevator installation and a method for controlling elevators

摘要

The invention relates to an elevator installation and also to a method for controlling elevators. In the method a run plan is formed for driving elevator cars on the basis of service requests, the elevator cars are driven according to the run plan, by supplying electric power via the electricity distribution network of the building to a hoisting machine driving an elevator car, and also by supplying electric power from a hoisting machine braking an elevator car back to the electricity distribution network of the building, alternatives for a run plan are formed for driving elevator cars on the basis of service requests, the electric power which the hoisting machines need for implementing the aforementioned alternatives is determined, and also a run plan is selected for use from the plurality of different alternatives, when implementing which run plan the electric powers of the hoisting machines, when summed together, smooth the power variation occurring in the electricity supply of the building.

主权项

1. An elevator installation in a building, the building including an electricity distribution network, the electricity distribution network electrically coupled to an electricity supply of the building, the elevator installation comprising:
a plurality of elevator cars; a plurality of hoisting machines, each hoisting machine configured to drive a separate elevator car of the plurality of elevator cars; a plurality of power supply devices, each power supply device configured to control a supply of electrical power between the electricity distribution network and a separate hoisting machine of the plurality of hoisting machines based on elevator drive commands received at the power supply device, respectively; a controller device electrically coupled to the plurality of power supply devices, the controller device configured to, based on receiving at least one elevator service request,
generate a plurality of alternative run plans to drive at least one elevator car to complete the at least one elevator service request, each alternative run plan including a separate set of elevator drive commands to drive at least one of the elevator cars to complete the at least one elevator service request;associate each given alternative run plan with a separate, respective estimated time variation of electrical power consumption of the electricity supply, the estimated time variation of electrical power consumption associated with driving the at least one of the elevator cars to complete the given alternative run plan;select a run plan from the alternative run plans, based on the selected run plan being associated with a minimum time variation of electrical power consumption of the electricity supply; andgenerate one or more elevator drive commands to command at least one of the power supply devices to drive at least one of the elevator cars according to the selected run plan.