A simulation study between the DQO gate firing unit (GFU) and a proposed GFU for high voltage direct current (HVDC) rectifier based on the CIGRE benchmark model in Matlab/Simulink is carried out. The proposed GFU does...A simulation study between the DQO gate firing unit (GFU) and a proposed GFU for high voltage direct current (HVDC) rectifier based on the CIGRE benchmark model in Matlab/Simulink is carried out. The proposed GFU does not use traditional phase lock loop (PLL) and offers structural simplicity, fast response and immunity to ac system voltage unbalance, harmonics, voltage sag, frequency jump and phase jump etc. Since there is no loop filter, no tuning issues are involved. Advantages of the proposed GFU are confirmed by extensive simulation results.展开更多
Considering the impact of aggregation cost on the performance of aggregation routes in wireless sensor networks,an aggregation-decision-based distributed routing algorithm for data aggregation is proposed.When source ...Considering the impact of aggregation cost on the performance of aggregation routes in wireless sensor networks,an aggregation-decision-based distributed routing algorithm for data aggregation is proposed.When source nodes arrive or leave,the algorithm can calculate the aggregation benefit according to data correlation,aggregation cost and transmission cost.Then the algo-rithm will adaptively make aggregation and routing decisions based on aggregation benefit.Therefore,it can jointly optimize the aggregation and transmission costs and reduce the energy consumption for data gathering.This distributed algorithm makes all the decisions only relying on the local information.Hence,the routing maintenance cost is limited.Simula tion results show that the energy consumption difference between this distributed online algorithm and the previous offline one is within 17%under any network conditions.展开更多
文摘A simulation study between the DQO gate firing unit (GFU) and a proposed GFU for high voltage direct current (HVDC) rectifier based on the CIGRE benchmark model in Matlab/Simulink is carried out. The proposed GFU does not use traditional phase lock loop (PLL) and offers structural simplicity, fast response and immunity to ac system voltage unbalance, harmonics, voltage sag, frequency jump and phase jump etc. Since there is no loop filter, no tuning issues are involved. Advantages of the proposed GFU are confirmed by extensive simulation results.
基金This work was supported by the National Natural Science Foundation of China(Grant No.60642005)the Foundation of China Scholarship and the Program for Changjiang Scholars and Innovative Research Team in University.
文摘Considering the impact of aggregation cost on the performance of aggregation routes in wireless sensor networks,an aggregation-decision-based distributed routing algorithm for data aggregation is proposed.When source nodes arrive or leave,the algorithm can calculate the aggregation benefit according to data correlation,aggregation cost and transmission cost.Then the algo-rithm will adaptively make aggregation and routing decisions based on aggregation benefit.Therefore,it can jointly optimize the aggregation and transmission costs and reduce the energy consumption for data gathering.This distributed algorithm makes all the decisions only relying on the local information.Hence,the routing maintenance cost is limited.Simula tion results show that the energy consumption difference between this distributed online algorithm and the previous offline one is within 17%under any network conditions.
