Power system stabilization using distributed inverters

摘要

A power grid of renewable sources is stabilized. Inverters for connecting power sources, such as wind turbines, batteries, or photovoltaics, to a grid are used to damp grid oscillations. The damping is distributed to the inverters, but based on measurements for the grid rather than local measurements. The control of the damping is based on grid wide analysis, and the damping is performed proportionately by already existing inverters distributed throughout the grid.

主权项

1. A system for stabilizing a power system, the system comprising:
a power grid of transmission lines; a plurality of sources of power; a plurality of inverters connecting respective sources of power to the transmission lines of the power grid; and a controller configured to measure a low frequency oscillation of the transmission lines of the power grid and to distribute signals over a communications network to the inverters, wherein the signals control the different inverters to damp different amounts of the low frequency oscillation at a given time; wherein the controller is configured to calculate an active and a reactive power to damp the low frequency oscillation of the power grid by dividing the active and reactive powers among the inverters and wherein the controller is configured to calculate a first relative contribution to the power grid of each inverter and a second relative contribution to the power grid of each inverter, and wherein the active power is divided among the inverters based on the first relative contribution to the power grid dependent on individual inverter rating and the reactive power is divided among the inverters based on the second relative contribution to the power grid dependent on individual inverter rating.