Stem. has been granted a patent for a method to control renewable energy power plants. The method involves measuring output power from inverters, calculating a point of interconnection output, and classifying inverters as either tracking or non-tracking based on their performance against setpoints. GlobalData’s report on Stem gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Stem, Power grid analytics was a key innovation area identified from patents. Stem's grant share as of July 2024 was 73%. Grant share is based on the ratio of number of grants to total number of patents.
Method for controlling renewable energy power plant inverters
The patent US12046909B2 outlines a method and system for controlling a power plant, specifically focusing on the management of inverters. The method involves retrieving output power measurements from multiple sensors associated with each inverter and determining the overall output power of the plant based on the active inverters. The process includes classifying inverters as either TRACKING ON or NON-TRACKING ON, depending on their ability to meet a predetermined setpoint. For those classified as TRACKING ON, an adjusted setpoint is generated by adding a deviation percentage, which is based on loss values, to the determined setpoint. This adjusted setpoint is then applied until the inverters cease tracking and transition to NON-TRACKING ON status.
Additionally, the patent describes mechanisms for adjusting the determined setpoint in response to the output power measurements and includes provisions for correcting setpoints for NON-TRACKING ON inverters. The system is designed to utilize a point of interconnection (POI) output measurement, which can be sourced from various types of meters located between the power plant and the power grid. The method also incorporates weather data to refine the power reference value, ensuring that the power plant operates efficiently in response to changing conditions. The patent further details a power plant controller equipped with a processor and memory, capable of executing these control methods, as well as non-transitory computer-readable media containing instructions for managing the inverters effectively.
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