The solid state transformer(SST) can be viewed as an energy router in energy internet. This work presents sliding mode control(SMC) to improve dynamic state and steady state performance of a three-stage(rectifier stag...The solid state transformer(SST) can be viewed as an energy router in energy internet. This work presents sliding mode control(SMC) to improve dynamic state and steady state performance of a three-stage(rectifier stage, isolated stage and inverter stage) SST for energy internet. SMC with three-level hysteresis sliding functions is presented to control the input current of rectifier stage and output voltage of inverter stage to improve the robustness under external disturbance and parametric uncertainties and reduce the switching frequency. A modified feedback linearization technique using isolated stage simplified model is presented to achieve satisfactory regulation of output voltage of the isolated stage. The system is tested for steady state operation, reactive power control, dynamic load change and voltage sag simulations, respectively. The switching model of SST is implemented in Matlab/ Simulink to verify the SST control algorithms.展开更多
在电力电子化背景下,从功能角度定义了柔性配电网(flexible distribution network,FDN),并提出了FDN的典型组网形态及其运行方式。首先,介绍了FDN的概念及其关键组网设施——柔性开闭站(flexible switching station,FSS)。其次,探讨了FD...在电力电子化背景下,从功能角度定义了柔性配电网(flexible distribution network,FDN),并提出了FDN的典型组网形态及其运行方式。首先,介绍了FDN的概念及其关键组网设施——柔性开闭站(flexible switching station,FSS)。其次,探讨了FDN的组网形态问题,提出了从现有配电网过渡发展到FDN的思路,并就我国现有的典型架空网、电缆网接线模型,提出了针对性的FDN组网形态。再次,讨论了FDN在正常运行和N-1故障以及检修情况下的运行方式,并提出了FDN的N-1安全分析方法。最后,通过算例对FDN进行了正常运行和N-1下的定量分析计算;与传统配电网对比发现,FDN的组网形态更简洁灵活,能更好地均衡负载、能够有效提高系统安全性与供电能力。展开更多
基金Projects(61403404,71571187)supported by the National Natural Science Foundation of China
文摘The solid state transformer(SST) can be viewed as an energy router in energy internet. This work presents sliding mode control(SMC) to improve dynamic state and steady state performance of a three-stage(rectifier stage, isolated stage and inverter stage) SST for energy internet. SMC with three-level hysteresis sliding functions is presented to control the input current of rectifier stage and output voltage of inverter stage to improve the robustness under external disturbance and parametric uncertainties and reduce the switching frequency. A modified feedback linearization technique using isolated stage simplified model is presented to achieve satisfactory regulation of output voltage of the isolated stage. The system is tested for steady state operation, reactive power control, dynamic load change and voltage sag simulations, respectively. The switching model of SST is implemented in Matlab/ Simulink to verify the SST control algorithms.
文摘在电力电子化背景下,从功能角度定义了柔性配电网(flexible distribution network,FDN),并提出了FDN的典型组网形态及其运行方式。首先,介绍了FDN的概念及其关键组网设施——柔性开闭站(flexible switching station,FSS)。其次,探讨了FDN的组网形态问题,提出了从现有配电网过渡发展到FDN的思路,并就我国现有的典型架空网、电缆网接线模型,提出了针对性的FDN组网形态。再次,讨论了FDN在正常运行和N-1故障以及检修情况下的运行方式,并提出了FDN的N-1安全分析方法。最后,通过算例对FDN进行了正常运行和N-1下的定量分析计算;与传统配电网对比发现,FDN的组网形态更简洁灵活,能更好地均衡负载、能够有效提高系统安全性与供电能力。
