Adaptive broadband beamforraing is a key issue in array applications. The adaptive broadband beamformer with tapped delay line （TDL） structure for nonuniform linear array （NLA） is designed according to the rule of...Adaptive broadband beamforraing is a key issue in array applications. The adaptive broadband beamformer with tapped delay line （TDL） structure for nonuniform linear array （NLA） is designed according to the rule of minimizing the beamformer＇s output power while keeping the distortionless response （DR） in the direction of desired signal and keeping the constant beamwidth （CB） with the prescribed sidelobe level over the whole operating band. This kind of beamforming problem can be solved with the interior-point method after being converted to the form of standard second order cone programming （SOCP）. The computer simulations are presented which illustrate the effectiveness of our beamformer.展开更多
近年来,以现代电力电子装置为基础的智能软开关(soft normally open point,SNOP)逐渐成为配电网重要的一环,为进一步充分发挥SNOP拓扑结构优势,提出在SNOP直流侧接入光储一体化系统对柔性配电网进行潮流优化。首先分析储能系统和光伏系...近年来,以现代电力电子装置为基础的智能软开关(soft normally open point,SNOP)逐渐成为配电网重要的一环,为进一步充分发挥SNOP拓扑结构优势,提出在SNOP直流侧接入光储一体化系统对柔性配电网进行潮流优化。首先分析储能系统和光伏系统的模型;然后,将其接入SNOP的直流侧,形成智能光储软开关(SNOP integrated with energy storage and photovoltaics,PE-SNOP),在此基础上建立柔性有源配电网的潮流调控模型,采用二阶锥规划算法进行求解;最后,利用改进的IEEE 33节点配电网模型对所提优化模型和算法进行了求解与验证,并与SNOP、智能储能开关单独优化的结果进行了对比。结果表明,所提模型有效提升了SNOP的调节能力,能够实现削峰填谷、抵抗随机扰动的作用,可改善系统运行状态,有效提高配电网运行经济性。展开更多
Considering the economics and securities for the operation of a power system, this paper presents a new adaptive dynamic programming approach for security-constrained unit commitment (SCUC) problems. In response to t...Considering the economics and securities for the operation of a power system, this paper presents a new adaptive dynamic programming approach for security-constrained unit commitment (SCUC) problems. In response to the “curse of dimension” problem of dynamic programming, the approach solves the Bellman’s equation of SCUC approximately by solving a sequence of simplified single stage optimization problems. An extended sequential truncation technique is proposed to explore the state space of the approach, which is superior to traditional sequential truncation in daily cost for unit commitment. Different test cases from 30 to 300 buses over a 24 h horizon are analyzed. Extensive numerical comparisons show that the proposed approach is capable of obtaining the optimal unit commitment schedules without any network and bus voltage violations, and minimizing the operation cost as well.展开更多
竞争性售电市场快速发展,差异化可靠性服务前景广阔,但仍受信息不对称问题与“搭车”现象制约。为此,针对可靠性服务优先的配电网重构问题,搭建各市场主体间双层博弈模型。首先,基于最小路法定义了具有差异化与精准化特征的可靠性服务...竞争性售电市场快速发展,差异化可靠性服务前景广阔,但仍受信息不对称问题与“搭车”现象制约。为此,针对可靠性服务优先的配电网重构问题,搭建各市场主体间双层博弈模型。首先,基于最小路法定义了具有差异化与精准化特征的可靠性服务。其次,设计配电网运营商(distribution system operator,DSO)与可靠性服务聚合商(reliability service aggregator,RSA)的合同模式,分析DSO、RSA与用户三方的博弈关系。在上层主从博弈中,DSO为主方,RSA为从方,双方通过博弈实现各自效益,并确定重构策略与下层总费用;在下层合作博弈中,可用Shapley值法实现用户总费用的公平分配。在证明该双层博弈模型纳什均衡存在性前提下,采用分散迭代法可实现稳定求解。算例分析表明,所提方法在适当市场机制下,可精准保障停电时优先用户可靠供电,满足用户差异化的可靠性需求。展开更多
基金supported by the National Nature Science Foundation of China (60472101)President Award of ChineseAcademy of Sciences(O729031511).
文摘Adaptive broadband beamforraing is a key issue in array applications. The adaptive broadband beamformer with tapped delay line （TDL） structure for nonuniform linear array （NLA） is designed according to the rule of minimizing the beamformer＇s output power while keeping the distortionless response （DR） in the direction of desired signal and keeping the constant beamwidth （CB） with the prescribed sidelobe level over the whole operating band. This kind of beamforming problem can be solved with the interior-point method after being converted to the form of standard second order cone programming （SOCP）. The computer simulations are presented which illustrate the effectiveness of our beamformer.
文摘近年来,以现代电力电子装置为基础的智能软开关(soft normally open point,SNOP)逐渐成为配电网重要的一环,为进一步充分发挥SNOP拓扑结构优势,提出在SNOP直流侧接入光储一体化系统对柔性配电网进行潮流优化。首先分析储能系统和光伏系统的模型;然后,将其接入SNOP的直流侧,形成智能光储软开关(SNOP integrated with energy storage and photovoltaics,PE-SNOP),在此基础上建立柔性有源配电网的潮流调控模型,采用二阶锥规划算法进行求解;最后,利用改进的IEEE 33节点配电网模型对所提优化模型和算法进行了求解与验证,并与SNOP、智能储能开关单独优化的结果进行了对比。结果表明,所提模型有效提升了SNOP的调节能力,能够实现削峰填谷、抵抗随机扰动的作用,可改善系统运行状态,有效提高配电网运行经济性。
文摘Considering the economics and securities for the operation of a power system, this paper presents a new adaptive dynamic programming approach for security-constrained unit commitment (SCUC) problems. In response to the “curse of dimension” problem of dynamic programming, the approach solves the Bellman’s equation of SCUC approximately by solving a sequence of simplified single stage optimization problems. An extended sequential truncation technique is proposed to explore the state space of the approach, which is superior to traditional sequential truncation in daily cost for unit commitment. Different test cases from 30 to 300 buses over a 24 h horizon are analyzed. Extensive numerical comparisons show that the proposed approach is capable of obtaining the optimal unit commitment schedules without any network and bus voltage violations, and minimizing the operation cost as well.
文摘竞争性售电市场快速发展,差异化可靠性服务前景广阔,但仍受信息不对称问题与“搭车”现象制约。为此,针对可靠性服务优先的配电网重构问题,搭建各市场主体间双层博弈模型。首先,基于最小路法定义了具有差异化与精准化特征的可靠性服务。其次,设计配电网运营商(distribution system operator,DSO)与可靠性服务聚合商(reliability service aggregator,RSA)的合同模式,分析DSO、RSA与用户三方的博弈关系。在上层主从博弈中,DSO为主方,RSA为从方,双方通过博弈实现各自效益,并确定重构策略与下层总费用;在下层合作博弈中,可用Shapley值法实现用户总费用的公平分配。在证明该双层博弈模型纳什均衡存在性前提下,采用分散迭代法可实现稳定求解。算例分析表明,所提方法在适当市场机制下,可精准保障停电时优先用户可靠供电,满足用户差异化的可靠性需求。
