Line current and energy storage control for an elevator drive
First Claim
1. A method for managing power distribution between a regenerative drive connected to an elevator hoist motor, and a primary power supply and electrical energy storage (EES) system connected to the regenerative drive, the method comprising:
- measuring a primary current flow between the primary power supply and the regenerative drive;
measuring a state-of-charge (SOC) of the EES system;
controlling a direction and magnitude of secondary current flow between the EES system and the regenerative drive as a function of the primary current flow and the SOC of the EES system; and
maintaining the SOC of the EES system within a limited SOC range except as necessary to maintain the primary current flow below a threshold current.
1 Assignment
0 Petitions
Accused Products
Abstract
Power distribution is managed between a regenerative drive (10) connected to an elevator hoist motor (12), and a primary power supply (20) and electrical energy storage (EES) system (36) connected to the regenerative drive. A state-of-charge (SOC) of the EES system and a primary current flow between the primary power supply and the regenerative drive are measured. A direction and magnitude of secondary current flow between the EES system and the regenerative drive is then controlled as a function of the primary current flow and the SOC of the EES system. SOC of the EES system is maintained in a limited range except as necessary to maintain primary current flow below a threshold current.
16 Citations
20 Claims
-
1. A method for managing power distribution between a regenerative drive connected to an elevator hoist motor, and a primary power supply and electrical energy storage (EES) system connected to the regenerative drive, the method comprising:
-
measuring a primary current flow between the primary power supply and the regenerative drive; measuring a state-of-charge (SOC) of the EES system; controlling a direction and magnitude of secondary current flow between the EES system and the regenerative drive as a function of the primary current flow and the SOC of the EES system; and maintaining the SOC of the EES system within a limited SOC range except as necessary to maintain the primary current flow below a threshold current. - View Dependent Claims (2, 3, 4, 5, 6, 17, 18)
-
-
7. A system for managing power distribution between a regenerative drive connected to an elevator hoist motor, and a primary power supply and electrical energy storage (EES) system connected to the regenerative drive, the system comprising:
-
a current sensor operable to measure a primary current flow between the primary power supply and the regenerative drive; a state-of-charge (SOC) sensor operable to measure a SOC of the EES system; and a power management module operable to control a direction and magnitude of secondary current flow between the EES system and the regenerative drive as a function of the primary current flow and the SOC of the EES system such that the power management module maintains the SOC of the EES system within a limited SOC range except as necessary to maintain the primary current flow below a threshold current. - View Dependent Claims (8, 9, 10, 11, 12, 19)
-
-
13. A method for managing power distribution between a regenerative drive connected to an elevator hoist motor, and a primary power supply and electrical energy storage (EES) system connected to the regenerative drive, the method comprising:
-
monitoring a first current flow between the primary power supply and the regenerative drive; controlling a direction and magnitude of a second current flow between the EES system and the regenerative drive as a function of the first current flow and power demand of the elevator hoist motor; and maintaining a state-of-charge (SOC) of the EES system within a limited SOC range except as necessary to maintain the first current flow below a threshold current. - View Dependent Claims (14, 15, 16, 20)
-
Specification