Under the dual-carbon target, hydrogen energy, as a zero-carbon secondary energy source, has great scope for replacing fossil feedstocks in the fields of energy, transportation and industry. However, the current research on the competitiveness of hydrogen energy in various fields is not sufficiently addressed. In this paper, we use the LEAP model to predict the future scale of hydrogen use and the two-factor learning curve to predict the trend of hydrogen price change from 2025 to 2050, using Qinghai Province as the research background. At the same time, considering the carbon emission reduction benefits and raw material costs, the competitiveness of hydrogen energy in energy, transportation, industry and other fields in the future is compared. The results show that: 1) The hydrogen load scale in Qinghai Province will grow fast from 2025 to 2030. From 2030 to 2040, it slows under the steady and basic scenarios but remains high under the accelerated one. By 2040, the consumption scales are 1.057 million, 649,000 and 442,000 tons respectively. 2) The price of hydrogen energy will drop rapidly from the current 28 CNY/kg to about 20 CNY/kg in the next 5 years. By 2040, the price of hydrogen energy will be reduced to about 17 CNY/kg. 3) In terms of hydrogen energy competitiveness, when carbon emissions are not taken into account, hydrogen energy is currently competitive in the transportation field. During 2032–2038, it will be competitive in the field of methanol synthesis. By 2040, hydrogen energy will not be competitive in the fields of ammonia synthesis and power/heating. When considering carbon emissions, the competitiveness of hydrogen energy in the transportation field will become greater. The competitive year in the field of methanol synthesis will be 1–2 years ahead. By 2040, it will not be competitive in the field of synthetic ammonia and power/heating, but the gap will be significantly reduced due to the consideration of carbon emissions.

高海拔架空输电线路电晕产生的可听噪声相对较大,传统的检测方法常常受到较大风速和背景噪声的影响,不仅理想的测试时段受限,而且准确性也不能得到充分的保障;同时,受带电安全距离的限制,也无法通过测得电晕光子团噪声的大小来预测高海拔架空输电线路下方的噪声大小.本文提出了利用测试电晕光子数来预测高海拔架空输电线路可听噪声的新方法,该方法建立了光子数—噪声声功率级间的关系以及预测计算模型,并通过工程实例验证,等效连续A声级的预测值与实测值误差范围在-1.6～1.2 dB之内,能够满足工程需要,将为高海拔地区交流架空输电线路工程建设环境影响评价提供技术借鉴和参考.

为分析西北地区750 kV输电线路地面4 kV/m等值线分布特征,根据悬链线方程建立气象和档距等参数的三维工频电场计算模型,分析单回与同塔双回输电线路线下4 kV/m等值线分布特征及大于4 kV/m区域占输电线路评价范围的占比;对比分析导线对地高度、单回导线布置形式和双回相序排列方式等对4 kV/m等值线分布特征的影响.

The optimization of trans-regional electricity transmission scale of China’s Western renewable energy base is crucial to drive China's energy revolution. Currently, the regional power planning or optimization is aimed at minimizing the total economic cost, without taking the cost and benefit of transregional electricity transmission into account. In this paper, a regional planning model considering the cost and benefit of trans-regional electricity transmission was proposed, and the target of trans-regional electricity transmission scale by 2050 was optimized. This study analysed the influence of carbon price, fossil fuel scarcity value, accommodation cost for renewable power on the optimized result of trans-regional electricity transmission scale. Furthermore, the policy implication of the research was also analysed.

对某350 MW火电厂汽轮发电机组进行噪声实测,采用Cadna A噪声预测软件对发电机组噪声进行预测计算,并与实际监测结果进行对比分析,对发电机组及发电机厂房噪声提出防治措施.

为研究西北地区750 kV并行输电线路线下三维工频磁场分布特征,根据悬链线方程建立气象和档距等参数的三维工频磁场计算模型,分析单回与同塔双回不同组合情况下并行输电线路线下工频磁场分布特征;对比分析了并行间距变化、杆塔相对位置、相序排列方式对并行输电线路线下工频磁场的影响.

科技创新是实现电网跨越发展的必由之路,本文以国网青海省电力公司为例,分析了科技创新工作面临的形势,提出了科技创新的思路和重点任务,探讨了全面加强科技创新工作的保障措施.