GENEVA, June 2 -- YUNNAN POWER GRID CO., LTD (No. 73 Tuodong RoadKunming, Yunnan 650041), 云南电网有限责任公司 (中国云南省昆明市拓东路73号), YUNNAN ELECTRIC POWER TEST AND RESEARCH INSTITUTE (GROUP) CO., LTD (Economic And Technological Development ZoneKunming, Yunnan 650000), 云南电力试验研究院（集团）有限公司 (中国云南省昆明市经济技术开发区) filed a patent application (PCT/CN2024/110895) for "VOLTAGE CONTROL METHOD AND SY...