The benchmark test system for distribution systems is necessary and important for system analysis and result data checking.In order to meet the development demand of the distribution systems which integrate with a hig...The benchmark test system for distribution systems is necessary and important for system analysis and result data checking.In order to meet the development demand of the distribution systems which integrate with a high penetration of distributed generation(DG),a benchmark test system for the distribution systems which adapts to current and future development trends is proposed.Based on the concentric zone theory and the typical regional settlement model in China,three typical distribution system scenarios corresponding to different system circle structures and regional development characteristics are designed in this paper.In order to adapt to the trend that the distribution systems will present the mixed state of AC and DC,a typical improvement scheme of distribution systems in urban scenario is presented.The benchmark test system of low-voltage distribution systems in a rural scenario is also designed because of the high penetration of DG.Moreover,the system structure,load parameters,integrated capacity and output characteristics of varies types of DG in different scenarios are described in detail.Finally,the simulation results,such as the time series power flow,reliability evaluation and hosting capacity of DGs are given.The benchmark test system proposed in this paper will lay a foundation for future research on distribution systems with a high proportion of DG and effectively support the distribution systems planning,design,operations and dispatches.展开更多
含高比例新能源交直流混联电网的稳定特性已发生深刻变化,功角稳定依然是威胁系统安全运行的关键问题,相关研究对标准算例的真实性、合理性及代表性提出更高的要求。该文根据实际电网拓扑和数据,构建适用于功角稳定特性研究的功角稳定...含高比例新能源交直流混联电网的稳定特性已发生深刻变化,功角稳定依然是威胁系统安全运行的关键问题,相关研究对标准算例的真实性、合理性及代表性提出更高的要求。该文根据实际电网拓扑和数据,构建适用于功角稳定特性研究的功角稳定机电暂态仿真算例(Chinese society for electricalengineering-rotoranglestability,CSEE-RAS),该系统以500kV为主网架,包含2个区域、1个交流通道、1个直流通道。提供2种运行方式,分别对应动态、暂态功角稳定场景,上述场景新能源出力占比均在50%以上。考虑新能源出力占比、机组接入位置和控制策略等因素,量化不同因素对稳定水平的影响。敏感性分析结果表明,该算例较为全面地反映了机电暂态尺度下的不同功角稳定特性,且具有灵活的拓展能力,可为功角稳定分析与控制的相关研究提供基础平台,有助于不同结论的横向比较和研究人员科研效率的提升。展开更多
针对传统灰狼优化算法位置更新时勘探与开发失衡,收敛速度慢且陷入局部最优的问题,提出一种改进的灰狼算法(balanced grey wolf algorithm based on fitness back learning,BGWO),引入非线性控制参数,增强算法前期勘探能力,加速收敛;在...针对传统灰狼优化算法位置更新时勘探与开发失衡,收敛速度慢且陷入局部最优的问题,提出一种改进的灰狼算法(balanced grey wolf algorithm based on fitness back learning,BGWO),引入非线性控制参数,增强算法前期勘探能力,加速收敛;在种群迭代阶段采用重心反向学习的最优适应度权重更新策略,平衡算法的勘探与开发。16组基准函数测试结果表明,改进后算法能自适应跳出局部最优,在加快算法收敛速度的同时提高全局收敛能力与精度。将BGWO应用于PV型旋风分离器粒级效率GBDT(gradient boosting decision tree)的建模,提高了GBDT的精度,模型相关系数0.980,均方误差0.00079,BGWO-GBDT与GBDT、PSO-GBDT和GWO-GBDT相对比,建模精度和稳定性明显提高,验证了BGWO的有效性。展开更多
新型电力系统中新能源、水电等清洁能源占比不断提升,高比例新能源带来的频率越限和高比例水电带来的超低频振荡风险日益突出。为支撑新型电力系统不同场景下频率安全稳定分析与控制研究需求,构建频率稳定标准算例(The Chinese Society ...新型电力系统中新能源、水电等清洁能源占比不断提升,高比例新能源带来的频率越限和高比例水电带来的超低频振荡风险日益突出。为支撑新型电力系统不同场景下频率安全稳定分析与控制研究需求,构建频率稳定标准算例(The Chinese Society for Electrical Engineering-frequency stability,CSEE-FS)。针对传统频率稳定问题,构建新能源装机及出力占比均在50%以上的高频、低频场景,分析故障强度、新能源出力及控制策略等对频率偏差最大值及其出现时间、稳态频率偏差的影响;针对超低频振荡问题,构建水电出力占比达89%场景,分析交直流不同故障形态、调速器关键参数、系统惯量等对振荡频率、振荡幅值的影响。敏感性分析结果表明,该文所建算例系统可准确反映不同频率稳定场景特性,且具备良好的扩展性,能满足新型电力系统频率安全稳定分析与控制方法验证需求。展开更多
Itanium is the first generation product processor based on IA-64 architecture. ORC(Open Research Compil-er )provides an open source IPF(Itanium Processor Family)research compiler infrastructure. We have compiled andru...Itanium is the first generation product processor based on IA-64 architecture. ORC(Open Research Compil-er )provides an open source IPF(Itanium Processor Family)research compiler infrastructure. We have compiled andrun NAS Benchmarks on the Itanium machine. This paper briefly describes the performance of orcc, sgicc and gcc inthe following 3 ways: execution time, compilation time, and executable file size. The results show that orcc has near-ly the same performance as sgicc, which is 2 fold faster over gcc in the aspect of execution time. We also find that evenwith the best-optimized program, the utilization ratio of process resources is no more that 70%.展开更多
基金supported in part by the National Key Research and Development Program of China under Grant 2016YFB0900100in part by the National Natural Science Foundation of China under Grant 51977140,Grant U1866207in part by the Natural Science Foundation of Tianjin under Grant 19JCYBJC21300.
文摘The benchmark test system for distribution systems is necessary and important for system analysis and result data checking.In order to meet the development demand of the distribution systems which integrate with a high penetration of distributed generation(DG),a benchmark test system for the distribution systems which adapts to current and future development trends is proposed.Based on the concentric zone theory and the typical regional settlement model in China,three typical distribution system scenarios corresponding to different system circle structures and regional development characteristics are designed in this paper.In order to adapt to the trend that the distribution systems will present the mixed state of AC and DC,a typical improvement scheme of distribution systems in urban scenario is presented.The benchmark test system of low-voltage distribution systems in a rural scenario is also designed because of the high penetration of DG.Moreover,the system structure,load parameters,integrated capacity and output characteristics of varies types of DG in different scenarios are described in detail.Finally,the simulation results,such as the time series power flow,reliability evaluation and hosting capacity of DGs are given.The benchmark test system proposed in this paper will lay a foundation for future research on distribution systems with a high proportion of DG and effectively support the distribution systems planning,design,operations and dispatches.
文摘含高比例新能源交直流混联电网的稳定特性已发生深刻变化,功角稳定依然是威胁系统安全运行的关键问题,相关研究对标准算例的真实性、合理性及代表性提出更高的要求。该文根据实际电网拓扑和数据,构建适用于功角稳定特性研究的功角稳定机电暂态仿真算例(Chinese society for electricalengineering-rotoranglestability,CSEE-RAS),该系统以500kV为主网架,包含2个区域、1个交流通道、1个直流通道。提供2种运行方式,分别对应动态、暂态功角稳定场景,上述场景新能源出力占比均在50%以上。考虑新能源出力占比、机组接入位置和控制策略等因素,量化不同因素对稳定水平的影响。敏感性分析结果表明,该算例较为全面地反映了机电暂态尺度下的不同功角稳定特性,且具有灵活的拓展能力,可为功角稳定分析与控制的相关研究提供基础平台,有助于不同结论的横向比较和研究人员科研效率的提升。
文摘针对传统灰狼优化算法位置更新时勘探与开发失衡,收敛速度慢且陷入局部最优的问题,提出一种改进的灰狼算法(balanced grey wolf algorithm based on fitness back learning,BGWO),引入非线性控制参数,增强算法前期勘探能力,加速收敛;在种群迭代阶段采用重心反向学习的最优适应度权重更新策略,平衡算法的勘探与开发。16组基准函数测试结果表明,改进后算法能自适应跳出局部最优,在加快算法收敛速度的同时提高全局收敛能力与精度。将BGWO应用于PV型旋风分离器粒级效率GBDT(gradient boosting decision tree)的建模,提高了GBDT的精度,模型相关系数0.980,均方误差0.00079,BGWO-GBDT与GBDT、PSO-GBDT和GWO-GBDT相对比,建模精度和稳定性明显提高,验证了BGWO的有效性。
文摘新型电力系统中新能源、水电等清洁能源占比不断提升,高比例新能源带来的频率越限和高比例水电带来的超低频振荡风险日益突出。为支撑新型电力系统不同场景下频率安全稳定分析与控制研究需求,构建频率稳定标准算例(The Chinese Society for Electrical Engineering-frequency stability,CSEE-FS)。针对传统频率稳定问题,构建新能源装机及出力占比均在50%以上的高频、低频场景,分析故障强度、新能源出力及控制策略等对频率偏差最大值及其出现时间、稳态频率偏差的影响;针对超低频振荡问题,构建水电出力占比达89%场景,分析交直流不同故障形态、调速器关键参数、系统惯量等对振荡频率、振荡幅值的影响。敏感性分析结果表明,该文所建算例系统可准确反映不同频率稳定场景特性,且具备良好的扩展性,能满足新型电力系统频率安全稳定分析与控制方法验证需求。
文摘Itanium is the first generation product processor based on IA-64 architecture. ORC(Open Research Compil-er )provides an open source IPF(Itanium Processor Family)research compiler infrastructure. We have compiled andrun NAS Benchmarks on the Itanium machine. This paper briefly describes the performance of orcc, sgicc and gcc inthe following 3 ways: execution time, compilation time, and executable file size. The results show that orcc has near-ly the same performance as sgicc, which is 2 fold faster over gcc in the aspect of execution time. We also find that evenwith the best-optimized program, the utilization ratio of process resources is no more that 70%.
