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供能设备模型对冷热电联供微网系统经济调度的影响 被引量:12
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作者 荆朝霞 袁灼新 +1 位作者 胡荣兴 吴青华 《南方电网技术》 北大核心 2016年第8期32-39,共8页
针对一种含光伏、蓄电池和冷热电联供的微网,在满足用户多种能源需求和联网运行的条件下,对系统中的微型燃气轮机、余热锅炉和制冷机等主要供能设备采用基于部分负荷(part load ratio,PLR)特性的模型,建立了以总运行成本最低为目标的微... 针对一种含光伏、蓄电池和冷热电联供的微网,在满足用户多种能源需求和联网运行的条件下,对系统中的微型燃气轮机、余热锅炉和制冷机等主要供能设备采用基于部分负荷(part load ratio,PLR)特性的模型,建立了以总运行成本最低为目标的微网日前动态经济调度的0-1混合整数非线性规划模型。通过求解某个楼宇CCHP型微网夏季典型日的算例,从优化调度方案、总运行费用等方面,比较了系统设备采用部分负荷特性模型和固定效率模型时的调度优化差异。结果表明,两种模型对于调度结果的误差不可忽略,部分负荷特性模型的结果更为准确;值得注意的是冷负荷所造成的模型误差比较显著。 展开更多
关键词 部分负荷模型 微网经济调度 冷热电联供 混合整数非线性规划 固定效率模型 模型误差
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CFD investigation and PIV validation of flow field in a compact return diffuser under strong part-load conditions 被引量:9
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作者 ZHOU Ling SHI WeiDong +1 位作者 CAO WeiDong YANG HongBin 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第3期405-414,共10页
The internal flow fields in a compact return diffuser under strong part-load conditions are investigated both numerically and experimentally.For numerical simulation,three-dimensional unsteady Reynolds-Averaged Navier... The internal flow fields in a compact return diffuser under strong part-load conditions are investigated both numerically and experimentally.For numerical simulation,three-dimensional unsteady Reynolds-Averaged Navier–Stokes equations are solved on high-quality structured grids in conjunction with the shear stress transport k–turbulence model by employing the computational fluid dynamics(CFD)software ANSYS-Fluent 14.5.For flow field measurements,a special test rig is designed and the two-dimensional particle image velocimetry(PIV)measurements are conducted in the diffuser midplane to capture the complex flow field and for validation of the CFD results.The analysis of the results has been focused on the flow structure in the diffuser,especially under part-load conditions.The detailed comparison between CFD and PIV results is performed.Vortical flow and recirculation flow patterns in the diffuser are captured and analyzed.Large flow separation and backflow appear under the part-load flow conditions.This paper provides a good data set for developing as well as evaluating the accuracy of various CFD models for capturing the complex flow field in a compact return diffuser used with multistage pumps. 展开更多
关键词 return diffuser numerical simulations part-load conditions particle image velocimetry
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