The spectacular opening and closing ceremonies of the 2022 Winter Olympics was held at China’s National Stadium, also known as Bird's Nest. In order to create the beautiful lighting effects for these ceremonies, the power distribution system in the stadium distributed a large number of large-scale LED screens, stage lights, lifting screens, frequency converters and other non-linear loads. All harmonically rich, single and three phase loads. In order to meet the Chinese power quality standard GB/T14549-93, the voltage distortion of the facility needed to be reduced from an anticipated level of THvD 13% (Line-Neutral) to below THvD 5%. Without a harmonic solution the high voltage distortion could interfere with normal operation of the equipment and even cause equipment damage.

Sinexcel’s engineering team consulted with the stadium’s infrastructure management to discuss the requirements and to gain a deeper understanding of the complex electrical load environment that would be operating at the peak times of the main events. It was determined that in order to establish a clean voltage environment for the electrical loads and ensure the normal stage lighting effect of the opening and closing ceremonies, Sinexcel installed a total of 5,200A of Sinexcel PRO Active Harmonic Filters in the Bird's Nest for harmonic mitigation using the advanced no-CT technology of the new series. They corrected the excessively high voltage distortion and partially mitigated current distortion as intended. This installation was one of the largest of its type in the world.

After the installation of the Sinexcel PRO Active Harmonic Filters, the power quality problems in the entire electrical system were significantly improved. Across all the sub-sections of the stadium’s electrical infrastructure, the overall voltage distortion rate dropped from over 13% to 2%. The voltage waveform had changed from a state of severe distortion to a near perfect sine wave. This provided stability, reliability and flexibility to the electrical system with provisions for load and demand fluctuations. The opening and closing ceremonies were facilitated successfully without any harmonic related anomalies which contributed to a very successful Winter Olympic Games.