Methods, systems, computer program products, and devices for renewable energy site power limit control

摘要

The present invention provides methods, systems, computer program products, and devices for renewable energy site power limit control that address conditions of plant saturation and loop delay. In an exemplary embodiment, power limit control of the present invention is broken into two levels of control: a site-wide real power limit control that produces a single site-wide command, SitePlimCom, for all inverters, and inverter-level power limit control that outputs a command, Inv[x].PlimCom[k], for individual inverters. In some embodiments, the invention has one or more of the following features: an integrator with nonlinear gains, limit based anti-windup, a power limit control term based on the sum of both integrator and feed-forward terms, and an inverter-level controller designed to meet slew rate and site power overshoot constraints. The invention can be used at any renewable energy site employing inverters wherein improved dynamic control performance is needed, including solar, wind, and tidal energy sites.

主权项

1. A method of power limit control for a renewable energy site comprising:
generating a site-wide power limit command by:
calculating a feed-forward power limit reference PlimRef[k];integrating an error integral term; andadding said feed-forward power limit reference to said error integral term to yield said site-wide power limit command for the renewable energy site; anddividing said site-wide power limit command by a number of enabled inverters at the renewable energy site to obtain an individual inverter command.