Methods and systems for improving control of a renewable energy power plant

A power plant controller for a renewable energy power plant comprising a plurality of renewable energy generators, the renewable energy power plant being connected to a power network, the power plant controller being configured to execute machine readable instructions to:

• receive a signal indicative of a voltage level of the power network to which the power plant is connected;
• receive a plurality of signals from the plurality of renewable energy generators, each signal being indicative of a voltage level of a respective renewable energy generator;
• and
• determine, for each of the plurality of renewable energy generators, a respective reactive power set point by:
• determining a reactive power reference value for that renewable energy generator based on an indicated voltage level of the power network;
• determining a reactive power adjustment value for that renewable energy generator based on a difference between an indicated voltage level of that renewable energy generator and a reference voltage level determined based on indicated voltage levels of the plurality of renewable energy generators;
• determining the reactive power set point for that renewable energy generator based on the reactive power reference value and the reactive power adjustment value, determined for that renewable energy generator;
• and
• dispatch each determined reactive power set point to a respective local controller associated with the respective renewable energy generator for controlling that renewable energy generator.