国内首次！国网天津电力成功开展大规模低压分布式光伏配网短路试验

Core Insights - The State Grid Tianjin Electric Power successfully conducted a large-scale low-voltage distributed photovoltaic (PV) short-circuit test, marking the first of its kind in China, to ensure the safe and reliable integration of renewable energy into the grid [1][2]. Group 1: Distributed Photovoltaic Development - As of May this year, Tianjin's distributed photovoltaic grid capacity reached 4.852 million kilowatts, with the Jizhou District contributing 646,700 kilowatts, accounting for 95.8% of the district's maximum load [2]. - The State Grid Tianjin Jizhou Company is advancing the construction of a high-capacity new-type distribution network, aiming to achieve comprehensive monitoring and control of distributed PV systems [2]. Group 2: Short-Circuit Test Significance - The short-circuit test is a critical method for validating the safety performance of the grid, providing essential data on system operation under fault conditions and assessing the rationality of protection configurations and control parameters [2]. - The test involved 12 sets of on-site measurement points across distributed PV devices, distribution lines, substations, and short-circuit points, ensuring comprehensive and precise data collection through an integrated monitoring platform [2][4]. Group 3: Innovations and Future Applications - Innovations in the test included automatic data collection and adjustments to grid operation modes, which allowed over 400 renewable energy users to remain connected without disruption during the test [2][4]. - The data obtained from the test will support core tasks such as relay protection setting calculations and precise modeling of low-voltage renewable energy systems, contributing to the development of fault defense technologies in new-type distribution networks [4].