China has triumphantly concluded the comprehensive AC collector system verification test for its 300MW variable-speed pumped storage generator-motor. Dongfang Electric Corporation and Chongqing Huaneng have achieved a pivotal breakthrough in independently developing the core technology of variable-speed pumped storage, thereby bridging a significant gap in domestic manufacturing capabilities. This groundbreaking achievement is poised to accelerate the widespread adoption of domestically produced variable-speed pumped storage units.