Using computer-aided design three-dimensional （3D） simulation technology, the recovery mechanism of single event upset and the effects of spacing and hit angle on the recovery are studied. It is found that the multi...Using computer-aided design three-dimensional （3D） simulation technology, the recovery mechanism of single event upset and the effects of spacing and hit angle on the recovery are studied. It is found that the multi-node charge collection plays a key role in recovery and shielding the charge sharing by adding guard rings. It cannot exhibit the recovery effect. It is also indicated that the upset linear energy transfer （LET） threshold is kept constant while the recovery LET threshold increases as the spacing increases. Additionally, the effect of incident angle on recovery is analysed and it is shown that a larger angle can bring about a stronger charge sharing effect, thus strengthening the recovery ability.展开更多
随着高比例可再生能源在电力系统中的广泛应用,可再生能源的波动性和随机性对电力系统静态电压稳定评估带来挑战,电力系统静态电压稳定域(static voltage stability region,SVSR)可以全面分析和监测电力系统电压稳定性,其关键是快速准...随着高比例可再生能源在电力系统中的广泛应用,可再生能源的波动性和随机性对电力系统静态电压稳定评估带来挑战,电力系统静态电压稳定域(static voltage stability region,SVSR)可以全面分析和监测电力系统电压稳定性,其关键是快速准确地构建稳定域边界。针对传统连续潮流法和非线性规划法计算量大的问题,提出一种基于SVSR边界拓扑性质的SVSR边界构建优化模型,根据边界连续且光滑的性质,由已知边界点通过预测-校正方法直接计算相邻边界点。在此模型基础上提出一种极限诱导分岔识别方法,构建考虑极限诱导分岔的SVSR边界。最后通过算例分析验证了所提方法的可行性和准确性。展开更多
In this paper n-dimensional flows （described by continuous-time system） with static bifurcations are considered with the aim of classification of different elementary bifurcations using the frequency domain formalis...In this paper n-dimensional flows （described by continuous-time system） with static bifurcations are considered with the aim of classification of different elementary bifurcations using the frequency domain formalism. Based on frequency domain approach, we prove some criterions for the saddle-node bifurcation, transcritical bifurcation and pitchfork bifurcation, and give an example to illustrate the efficiency of the result obtained.展开更多
针对大规模新能源接入后电力系统电压安全问题突出、快速评估困难的问题,文中以电力系统广域相量测量系统(Wide Area Measurement System,WAMS)为数据平台,在具有完备数学基础的无功电压灵敏度及分叉理论的基础上,建立了基于自然摄动的...针对大规模新能源接入后电力系统电压安全问题突出、快速评估困难的问题,文中以电力系统广域相量测量系统(Wide Area Measurement System,WAMS)为数据平台,在具有完备数学基础的无功电压灵敏度及分叉理论的基础上,建立了基于自然摄动的电力系统静态电压评估指标体系,根据WAMS获取的自然激励下的同步无功及电压响应数据,采用最小二乘法拟合计算无功电压灵敏度,并引入加权平均值算法对一段时间内的灵敏度结果进行统计,以提高拟合后的无功电压灵敏度准确性和可靠性。在DIGSILENT/Power Factory仿真平台上搭建了含风电场的IEEE10机39节点系统,利用时域仿真生成同步响应数据,对比不同运行情况下的灵敏度拟合结果与实际无功裕度,验证了文中静态电压安全评估方法的有效性。展开更多
基金supported by the State Key Program of the National Natural Science Foundation of China (Grant No.60836004)the National Natural Science Foundation of China (Grant Nos.61076025 and 61006070)
文摘Using computer-aided design three-dimensional （3D） simulation technology, the recovery mechanism of single event upset and the effects of spacing and hit angle on the recovery are studied. It is found that the multi-node charge collection plays a key role in recovery and shielding the charge sharing by adding guard rings. It cannot exhibit the recovery effect. It is also indicated that the upset linear energy transfer （LET） threshold is kept constant while the recovery LET threshold increases as the spacing increases. Additionally, the effect of incident angle on recovery is analysed and it is shown that a larger angle can bring about a stronger charge sharing effect, thus strengthening the recovery ability.
文摘随着高比例可再生能源在电力系统中的广泛应用,可再生能源的波动性和随机性对电力系统静态电压稳定评估带来挑战,电力系统静态电压稳定域(static voltage stability region,SVSR)可以全面分析和监测电力系统电压稳定性,其关键是快速准确地构建稳定域边界。针对传统连续潮流法和非线性规划法计算量大的问题,提出一种基于SVSR边界拓扑性质的SVSR边界构建优化模型,根据边界连续且光滑的性质,由已知边界点通过预测-校正方法直接计算相邻边界点。在此模型基础上提出一种极限诱导分岔识别方法,构建考虑极限诱导分岔的SVSR边界。最后通过算例分析验证了所提方法的可行性和准确性。
基金This work was supported by the National Natural Science Foundation of China (No. 10371136).
文摘In this paper n-dimensional flows （described by continuous-time system） with static bifurcations are considered with the aim of classification of different elementary bifurcations using the frequency domain formalism. Based on frequency domain approach, we prove some criterions for the saddle-node bifurcation, transcritical bifurcation and pitchfork bifurcation, and give an example to illustrate the efficiency of the result obtained.
文摘针对大规模新能源接入后电力系统电压安全问题突出、快速评估困难的问题,文中以电力系统广域相量测量系统(Wide Area Measurement System,WAMS)为数据平台,在具有完备数学基础的无功电压灵敏度及分叉理论的基础上,建立了基于自然摄动的电力系统静态电压评估指标体系,根据WAMS获取的自然激励下的同步无功及电压响应数据,采用最小二乘法拟合计算无功电压灵敏度,并引入加权平均值算法对一段时间内的灵敏度结果进行统计,以提高拟合后的无功电压灵敏度准确性和可靠性。在DIGSILENT/Power Factory仿真平台上搭建了含风电场的IEEE10机39节点系统,利用时域仿真生成同步响应数据,对比不同运行情况下的灵敏度拟合结果与实际无功裕度,验证了文中静态电压安全评估方法的有效性。
