New energy is a crucial component of the future power grid, and the control strategies and performance of its controllers will significantly impact the grid. These controllers can be categorized into device-level and station-level controllers based on their scope of control. Currently, device-level controllers are primarily tested using physical model platforms. However, due to continuously updated grid-connected inspection standards, increasing converter capacity, and the emergence of station-level controllers, physical model platforms can no longer meet all testing requirements. This highlights the urgent need to develop closed-loop testing platforms tailored for both device-level and station-level controllers.

Based on the characteristics of the two major categories of new energy controllers—such as their variety, diverse communication interfaces, and complex functions and testing indicators—a technical solution has been proposed to develop two sets of real-time digital simulation testing platforms. This approach addresses issues across the entire testing process for both device-level and station-level new energy controllers, including the construction of testing environments, modeling of test scenarios, automation of testing methods, and analysis of test results.

In terms of modeling, methods such as small-step modeling, pulse-averaging modeling, and hierarchical modeling have been implemented to solve challenges in converter-level and station-level modeling. Automated testing methods are adopted to achieve automated testing on RTDS and RTplus real-time simulation platforms. Test result analysis is automated through programs like automatic identification of high and low voltage ride-through control parameters and automatic analysis of impedance scanning results. Furthermore, communication protocols such as IEC61850-GOOSE, 104, and Modbus have been developed. Through technical optimization, the simulation of 256 channels of IEC61850-GOOSE intelligent terminals has been achieved, enabling connectivity for testing station-level controllers.

To address the challenges in testing both device-level and station-level new energy controllers, KETOP Research Institute developed a real-time digital simulation testing platform specifically for these controllers. This platform overcomes difficulties including power electronics device modeling, multi-element modeling at the station level, wide-band power amplifier application, multi-protocol access, hybrid fault scenario setting, automated testing, and automated test result analysis. It seamlessly integrates the entire testing process—from test environment setup and test modeling to test execution and result analysis—thereby achieving rapid and comprehensive testing of new energy controllers.
       In September 2023, this achievement was appraised by the China Machinery Industry Federation and the Henan Electrical Appliance Industry Association as having reached the internationally advanced level.