大规模分布式电源的存在允许配电网通过网络重构改变供电方式,实现部分区域在必要时刻以异步孤岛形式运行。但配电网运行方式的改变必然伴随着关键换流器控制模式的切换和参数的调整,如何平稳地实现配电分区在并网和孤岛之间的转换是实...大规模分布式电源的存在允许配电网通过网络重构改变供电方式,实现部分区域在必要时刻以异步孤岛形式运行。但配电网运行方式的改变必然伴随着关键换流器控制模式的切换和参数的调整,如何平稳地实现配电分区在并网和孤岛之间的转换是实现有源配电网安全可靠运行的重要内容。针对通过软开关(soft open point,SOP)实现柔性互联的配电分区,分析了该系统由并网转为异步孤岛运行的暂态特性,提出了基于参考功率自适应的改进下垂控制策略,并采用状态跟踪方法降低了配电网运行状态切换时刻的暂态波动,实现了配电网运行方式的平滑切换。在PSCAD/EMTDC环境下搭建了仿真模型进行验证,结果表明,所提控制方法可有效提升分区互联有源配电网运行的灵活性。展开更多
Particle filtering (PF) has been widely used in solving nonlinear/non Gaussian filtering problems. Inferring to the target tracking in a wireless sensor network (WSN), distributed PF (DPF) was used due to the limitati...Particle filtering (PF) has been widely used in solving nonlinear/non Gaussian filtering problems. Inferring to the target tracking in a wireless sensor network (WSN), distributed PF (DPF) was used due to the limitation of nodes’ computing capacity. In this paper, a novel filtering method—asynchronous DPF (ADPF) for target tracking in WSN is proposed. There are two keys in the proposed algorithm. Firstly, instead of transferring value and weight of particles, Gaussian mixture model (GMM) is used to approximate the posteriori distribution, and only GMM parameters need to be transferred which can reduce the bandwidth and power consumption. Secondly, in order to use sampling information effectively, when target moving to the next cluster head region, the GMM parameters are transfer to the next cluster head, and combine with the new local GMM parameters to compose the new GMM parameters incrementally. The ADPF can also deal with the situation of different number of nodes in different cluster when using the dynamic cluster structure. The proposed ADPF is compared to some other DPF for WSN target tracking, and the experimental results show that not only the precision is improved, but also the bandwidth and power is reduced.展开更多
In this study,we discuss how multi-agent systems(MASs)with a leader can achieve distributed bipartite tracking consensus using asynchronous impulsive control strategies.The proposed asynchronous impulsive control appr...In this study,we discuss how multi-agent systems(MASs)with a leader can achieve distributed bipartite tracking consensus using asynchronous impulsive control strategies.The proposed asynchronous impulsive control approach does not require the impulse to occur simultaneously for all agents.The communication links between neighboring nodes of MASs are antagonistic.When the leader’s control input is non-zero,sufficient conditions are obtained to achieve bipartite asynchronous impulsive tracking consensus in closed-loop MASs.More extensive ranges of asynchronous impulsive effects are discussed,and the designed controller’s feedback can effectively work against adverse impulsive permutation.Simple algebraic conditions for estimating the impulsive gain boundary and asynchronous impulsive interval are presented.Theoretical results are demonstrated with illustrative examples.展开更多
文摘大规模分布式电源的存在允许配电网通过网络重构改变供电方式,实现部分区域在必要时刻以异步孤岛形式运行。但配电网运行方式的改变必然伴随着关键换流器控制模式的切换和参数的调整,如何平稳地实现配电分区在并网和孤岛之间的转换是实现有源配电网安全可靠运行的重要内容。针对通过软开关(soft open point,SOP)实现柔性互联的配电分区,分析了该系统由并网转为异步孤岛运行的暂态特性,提出了基于参考功率自适应的改进下垂控制策略,并采用状态跟踪方法降低了配电网运行状态切换时刻的暂态波动,实现了配电网运行方式的平滑切换。在PSCAD/EMTDC环境下搭建了仿真模型进行验证,结果表明,所提控制方法可有效提升分区互联有源配电网运行的灵活性。
文摘Particle filtering (PF) has been widely used in solving nonlinear/non Gaussian filtering problems. Inferring to the target tracking in a wireless sensor network (WSN), distributed PF (DPF) was used due to the limitation of nodes’ computing capacity. In this paper, a novel filtering method—asynchronous DPF (ADPF) for target tracking in WSN is proposed. There are two keys in the proposed algorithm. Firstly, instead of transferring value and weight of particles, Gaussian mixture model (GMM) is used to approximate the posteriori distribution, and only GMM parameters need to be transferred which can reduce the bandwidth and power consumption. Secondly, in order to use sampling information effectively, when target moving to the next cluster head region, the GMM parameters are transfer to the next cluster head, and combine with the new local GMM parameters to compose the new GMM parameters incrementally. The ADPF can also deal with the situation of different number of nodes in different cluster when using the dynamic cluster structure. The proposed ADPF is compared to some other DPF for WSN target tracking, and the experimental results show that not only the precision is improved, but also the bandwidth and power is reduced.
基金the National Natural Science Foundation of China(No.61973078)the “333 Engineering” Foundation of Jiangsu Province,China(No.BRA2019260)the Zhejiang Provincial Natural Science Foundation of China(No.LR20F020002)。
文摘In this study,we discuss how multi-agent systems(MASs)with a leader can achieve distributed bipartite tracking consensus using asynchronous impulsive control strategies.The proposed asynchronous impulsive control approach does not require the impulse to occur simultaneously for all agents.The communication links between neighboring nodes of MASs are antagonistic.When the leader’s control input is non-zero,sufficient conditions are obtained to achieve bipartite asynchronous impulsive tracking consensus in closed-loop MASs.More extensive ranges of asynchronous impulsive effects are discussed,and the designed controller’s feedback can effectively work against adverse impulsive permutation.Simple algebraic conditions for estimating the impulsive gain boundary and asynchronous impulsive interval are presented.Theoretical results are demonstrated with illustrative examples.
