在确定性规划准则和概率性规划准则的基础上,提出一个应用于输电网中长期规划的混合性规划模型。该模型采用静态安全柔性约束、故障发生概率、可靠性成本、投资费用、期望缺供电量(expected energy not served,EENS)以及缺电时间期望(lo...在确定性规划准则和概率性规划准则的基础上,提出一个应用于输电网中长期规划的混合性规划模型。该模型采用静态安全柔性约束、故障发生概率、可靠性成本、投资费用、期望缺供电量(expected energy not served,EENS)以及缺电时间期望(loss of load expectation,LOLE)等因素来计算、评估潜在故障的影响,并通过建立电网成本期望值最小的目标函数、经济性约束和可靠性约束保证电网规划的可靠性和经济性,利用直流潮流模型和最优潮流模型将输电网规划问题转为混合整数线性规划问题,采用商业优化软件CPLEX进行寻优计算,实现了为输电网规划寻找最优规划方案的目的。最后,通过与传统规划模型的比较和实际电网算例验证了模型的合理性、有效性和经济性。展开更多
Remote and Hybrid work has been a common practice for many organizations in recent years. It has many advantages such as offering a better work-life balance but it might also negatively affect productivity and teamwor...Remote and Hybrid work has been a common practice for many organizations in recent years. It has many advantages such as offering a better work-life balance but it might also negatively affect productivity and teamwork. While an organization would like to satisfy the remote/hybrid preferences of its employees, it also must ensure that there are enough people working in the office to satisfy certain professional needs. Finding the right balance between in-office and remote work is not an easy task. We develop three optimization models to give solutions to the problem. The most comprehensive model allows employees to work remotely some days of the week and flexible hours for those weekdays when employees work in the office. Our computational results show that the models are very time-efficient in practice. The computational results also include a sensitivity analysis of the most comprehensive model.展开更多
为了实现混合网络资源的最大利用,以IP/GMPLS over WDM网络为例,提出了一种区分业务的混合网络资源优化方法。该方法通过不给多跳低等级业务提供光路级保护,以及当承载LSP业务的工作光路故障无关的情况下保护光路共享波长资源的方式,有...为了实现混合网络资源的最大利用,以IP/GMPLS over WDM网络为例,提出了一种区分业务的混合网络资源优化方法。该方法通过不给多跳低等级业务提供光路级保护,以及当承载LSP业务的工作光路故障无关的情况下保护光路共享波长资源的方式,有效降低了光路的建立数以及所需的波长数,在最大程度上提高了网络资源的利用率,降低了网络的整体开销。最后建立了整数线性规划模型,并通过该模型验证了方法的有效性。展开更多
为了抑制风电波动,减少弃风量,考虑到配备储热的太阳能热发电(concentrated solar power,CSP)系统具有可调度性,提出了一种风电—CSP联合发电系统。该系统由风电子系统、CSP子系统及电加热(electric heater,EH)子系统组成。其中,EH子系...为了抑制风电波动,减少弃风量,考虑到配备储热的太阳能热发电(concentrated solar power,CSP)系统具有可调度性,提出了一种风电—CSP联合发电系统。该系统由风电子系统、CSP子系统及电加热(electric heater,EH)子系统组成。其中,EH子系统的主要作用是将弃风电能转化为热能,并将热能送入CSP储热子系统(thermal energy storage,TES),既为弃风利用提供一条有效途径,又为CSP增加一个热源,使系统的可调度性和灵活性进一步提高。针对该联合系统,以最小化系统输出负荷与计划负荷间的偏差和最大化能源利用率为目标,建立了其混合整数规划调度模型。以未加EH子系统的风电–CSP联合发电系统为参照,通过案例对比研究了在晴天及部分阴云天气下系统的特性。结果显示该联合系统可更好地跟踪计划负荷,有效降低风电弃风量,为CSP储热子系统提供更多的热能,使系统具有更高的灵活性和可调度性。展开更多
文摘在确定性规划准则和概率性规划准则的基础上,提出一个应用于输电网中长期规划的混合性规划模型。该模型采用静态安全柔性约束、故障发生概率、可靠性成本、投资费用、期望缺供电量(expected energy not served,EENS)以及缺电时间期望(loss of load expectation,LOLE)等因素来计算、评估潜在故障的影响,并通过建立电网成本期望值最小的目标函数、经济性约束和可靠性约束保证电网规划的可靠性和经济性,利用直流潮流模型和最优潮流模型将输电网规划问题转为混合整数线性规划问题,采用商业优化软件CPLEX进行寻优计算,实现了为输电网规划寻找最优规划方案的目的。最后,通过与传统规划模型的比较和实际电网算例验证了模型的合理性、有效性和经济性。
文摘Remote and Hybrid work has been a common practice for many organizations in recent years. It has many advantages such as offering a better work-life balance but it might also negatively affect productivity and teamwork. While an organization would like to satisfy the remote/hybrid preferences of its employees, it also must ensure that there are enough people working in the office to satisfy certain professional needs. Finding the right balance between in-office and remote work is not an easy task. We develop three optimization models to give solutions to the problem. The most comprehensive model allows employees to work remotely some days of the week and flexible hours for those weekdays when employees work in the office. Our computational results show that the models are very time-efficient in practice. The computational results also include a sensitivity analysis of the most comprehensive model.
文摘为了实现混合网络资源的最大利用,以IP/GMPLS over WDM网络为例,提出了一种区分业务的混合网络资源优化方法。该方法通过不给多跳低等级业务提供光路级保护,以及当承载LSP业务的工作光路故障无关的情况下保护光路共享波长资源的方式,有效降低了光路的建立数以及所需的波长数,在最大程度上提高了网络资源的利用率,降低了网络的整体开销。最后建立了整数线性规划模型,并通过该模型验证了方法的有效性。
文摘为了抑制风电波动,减少弃风量,考虑到配备储热的太阳能热发电(concentrated solar power,CSP)系统具有可调度性,提出了一种风电—CSP联合发电系统。该系统由风电子系统、CSP子系统及电加热(electric heater,EH)子系统组成。其中,EH子系统的主要作用是将弃风电能转化为热能,并将热能送入CSP储热子系统(thermal energy storage,TES),既为弃风利用提供一条有效途径,又为CSP增加一个热源,使系统的可调度性和灵活性进一步提高。针对该联合系统,以最小化系统输出负荷与计划负荷间的偏差和最大化能源利用率为目标,建立了其混合整数规划调度模型。以未加EH子系统的风电–CSP联合发电系统为参照,通过案例对比研究了在晴天及部分阴云天气下系统的特性。结果显示该联合系统可更好地跟踪计划负荷,有效降低风电弃风量,为CSP储热子系统提供更多的热能,使系统具有更高的灵活性和可调度性。
