Stem. has been granted a patent for a method to control renewable energy power plants. The method involves measuring output 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 June 2024 was 71%. 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 then applied until these inverters cease tracking. The method also allows for adjustments to the setpoint based on the performance of the inverters and incorporates weather data to refine the power reference value.
Additionally, the patent describes a power plant controller equipped with a processor and memory that executes the outlined method. This controller is designed to monitor and adjust the setpoints dynamically, ensuring optimal performance of the inverters. It can increase the determined setpoint if the total output from the active inverters falls short of expectations. Furthermore, the controller can correct setpoints for NON-TRACKING ON inverters and implement a rate-limited increase based on the number of such inverters. The system aims to enhance the efficiency and reliability of power generation by ensuring that inverters operate within their optimal parameters, thereby improving overall power plant performance.
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