大容量试验系统建模方法及一键顺控方案研究

大容量试验是检验电力装备性能，保障装备安全可靠运行的重要环节。现有的大容量试验回路主要依靠人工操作，存在流程复杂、效率低且易出错的问题。针对大容量试验回路智能化控制的难题，研究建立了冲击发电机单电机短路模型和双电机并联短路模型，分析了发电机短路特性，结合典型大容量试验回路设计了一键顺控方案，提出试验回路一键顺控操作流程。通过对发电机短路模型和大容量试验回路系统的仿真，验证了所建发电机短路模型的正确性及大容量短路试验一键顺控方案的合理性

Geochemical characteristics of nitrogen in the core sediments from Changjiang River Estuary

研究分析了长江口柱状沉积物中氮的赋存形态,并结合沉积速率和有机碳含量分析了氮的迁移转化特征和有机质来源。研究结果表明,有机物与硫化物结合态氮(OSf-n)是柱状样可转化形态氮中的主要赋存形态,碳酸盐结合态氮(Cf-n)含量最低;位于长江口122°E附近测点的各形态氮的垂直分布与122.6°E附近测点的差异明显,受水动力条件和沉积速率等因素影响,122.6°E附近测点的有机氮降解速率常数和各形态氮的埋藏通量均高于122°E附近测点;长江口柱状沉积物中有机氮降解主要发生在沉积物表层和次表层;OC/Tn值的垂直分布变化幅度较大,陆源输入均大于70%。Total nitrogen and its forms in the core sediments from Changjiang River Estuary were studied with sequential extraction method.And combined with the deposition rate and the organic carbon content,the characteristics of its migration and transformation and the sources of organic carbon were also studied.The results show that OSF-N is the main form of transferable nitrogen,and CF-N content is the lowest of the transferable nitrogen in the core sediments.There are evident differences in the vertical distribution of different nitrogen forms in the core sediments of SH3111 station(at 31°N,122°E) from that in SH3110 station(31°N,122.6°E).Affected by the hydrodynamics and the deposition rate,the values of the degradation rate constant of the organic nitrogen and the burial flux of different forms of nitrogen at the SH3110 station are higher than those at the SH3111 station.Degradation of the organic nitrogen occurred mainly in the surface and sub-surface layers of the sediment and the vertical distribution of the OC/TN ratios varies greatly,showing different depositional conditions.The proportions of terrigenous carbon are higher than 70%.环保公益性行业科研专项资助项目(2008467041);浙江省环保厅科研专项资助项目(2008-30

Nitrogen forms and their concentration distribution in surface sediments of Zhejiang offshore

运用分相浸取法分析了浙江近岸海域60个站位的表层沉积物(0~2 CM)中各形态氮的含量和分布.研究结果表明,表层沉积物中总氮(Tn)含量为214.66~861.44 Mg/kg,均值为580.52Mg/kg,位于浅水区的长江口、杭州湾和浙江沿岸的Tn含量低于东部远岸海域;可转化态氮(TTn)含量只占总氮的3.06%~37.24%,有机态和硫化物结合态氮(OSf-n)是沉积物中可转化态氮的主要赋存形态,非转化态氮(nTn)是浙江近岸海域表层沉积物中的优势形态.各站位沉积物中氮在不同提取相中的含量差异较大,与沉积物的陆源输入、沉积物重金属含量、粒径分布及沉积海域的水动力条件等因素有关.Different forms of nitrogen in surface sediments of Zhejiang offshore were studied with sequential extraction method.The result show that total nitrogen concentration in offshore surface sediments of Zhejiang ranged from 214.66 to 861.44 mg/kg with an average 580.52 mg/kg,and the concentration of TN was found higher in the eastern offshore of Zhejiang than Changjiang Estuary,Hangzhou Bay and Zhejiang coastal area.Transferable nitrogen,accounting for least part of total nitrogen,varied from 3.06% to 37.24%.Organic matter-sulfide form(OSF) is the dominant form of transferable nitrogen while non-transferable form is the dominant form in the surface sediments.Distribution of nitrogen forms is controlled by environmental factors,such as terrigenous inputs,grain size,heavy metal contents in surface sediments and hydro-dynamics.国家环保部公益科研专项资助项目(2008467041);浙江省环保厅科研专项资助项目(2008-30