Although the proportional current sharing has been widely studied,the heterogeneous characteristic of the different interfaced converters and power coupling terms among distributed generators(DGs)are rarely considered...Although the proportional current sharing has been widely studied,the heterogeneous characteristic of the different interfaced converters and power coupling terms among distributed generators(DGs)are rarely considered.Therefore,this paper proposes a secondary H_(∞)consensus method with a periodic dynamic event-driven scheme for dc microgrids with power coupling to accomplish the precise proportional current-sharing.It is useful for reducing carbon.First,a generalized converter is constructed through equivalent transformation between rectifier and boost converter.Moreover,the heterogeneous characteristic of the interfaced converters regarding different DGs,such as wind and solar generators,is embedded into controller design.Furthermore,the standard linear heterogeneous multi-agent system with power coupling term is built.On this basis,the problem of proportional current sharing is modified into the output consistency problem of multi-agent systems.Furthermore,the H_(∞)consensus approach is proposed to accomplish the precise proportional current sharing.Meanwhile,to shorten communication bandwidth,the periodic dynamic event-driven communication strategy is designed.Compared with traditional event-driven communication schemes,a lower communication frequency has been obtained through the proposed communication scheme.In addition,this communication scheme not only avoids Zeno-behavior,but also acquires the smallest sampling time interval.Finally,effectiveness of the proposed approach is verified by two test systems.展开更多
The concept of connecting two boost half bridge DC-DC converter modules in input-parallel output-parallel configuration is presented.The input-parallel-output-parallel(IPOP)converter consists of multiple boost half br...The concept of connecting two boost half bridge DC-DC converter modules in input-parallel output-parallel configuration is presented.The input-parallel-output-parallel(IPOP)converter consists of multiple boost half bridge(BHB)DC-DC converter modules which are connected in parallel at the input and output side.This kind of converter is an attractive solution for high power applications.The correlation between input current sharing(ICS)and output current sharing(OCS)of the IPOP converter basic modules is described.Two loop control strategies,consisting of input current loop and output voltage loop,have been developed to achieve equal ICS and OCS in this present work.The control strategy for the IPOP configuration of boost half bridge DC-DC converter has been verified for different load conditions(half load and full load).The IPOP system proposed here is comprising of two modules but it can be extended to three or more.The performance of the proposed system along with the control strategy is verified by simulation in MATLAB using Simpower tool.Finally the satisfactory simulation results are obtained.展开更多
Multi-modular system plays an important role in power system architecture because low voltage and low power converters can be connected in any combination parallel or series at input/output side in order to obtained a...Multi-modular system plays an important role in power system architecture because low voltage and low power converters can be connected in any combination parallel or series at input/output side in order to obtained any given power system specifications.Multi-modular boost half bridge DC-DC converter in the configuration of input series output parallel has been investigated in this paper.The boost half bridge DC-DC converters are connected in input series output parallel configuration in order to achieve equal input voltage sharing and output current sharing between the converters.This can be achieved with the help of dynamic control scheme which consists of two loops,a voltage loop and a current loop,for each module.Dynamic behavior of multi-modular converter configuration has been observe by varying the load condition.Moreover,the results obtained through multi-modular converter describe that the system has good dynamic and steady state response.Although two converter modules are focused in this paper but it can be modified to any number of modules.展开更多
基金supported by National Key Research and Development Program of China(2018YFA0702200)National Natural Science Foundation of China(62073065).
文摘Although the proportional current sharing has been widely studied,the heterogeneous characteristic of the different interfaced converters and power coupling terms among distributed generators(DGs)are rarely considered.Therefore,this paper proposes a secondary H_(∞)consensus method with a periodic dynamic event-driven scheme for dc microgrids with power coupling to accomplish the precise proportional current-sharing.It is useful for reducing carbon.First,a generalized converter is constructed through equivalent transformation between rectifier and boost converter.Moreover,the heterogeneous characteristic of the interfaced converters regarding different DGs,such as wind and solar generators,is embedded into controller design.Furthermore,the standard linear heterogeneous multi-agent system with power coupling term is built.On this basis,the problem of proportional current sharing is modified into the output consistency problem of multi-agent systems.Furthermore,the H_(∞)consensus approach is proposed to accomplish the precise proportional current sharing.Meanwhile,to shorten communication bandwidth,the periodic dynamic event-driven communication strategy is designed.Compared with traditional event-driven communication schemes,a lower communication frequency has been obtained through the proposed communication scheme.In addition,this communication scheme not only avoids Zeno-behavior,but also acquires the smallest sampling time interval.Finally,effectiveness of the proposed approach is verified by two test systems.
文摘The concept of connecting two boost half bridge DC-DC converter modules in input-parallel output-parallel configuration is presented.The input-parallel-output-parallel(IPOP)converter consists of multiple boost half bridge(BHB)DC-DC converter modules which are connected in parallel at the input and output side.This kind of converter is an attractive solution for high power applications.The correlation between input current sharing(ICS)and output current sharing(OCS)of the IPOP converter basic modules is described.Two loop control strategies,consisting of input current loop and output voltage loop,have been developed to achieve equal ICS and OCS in this present work.The control strategy for the IPOP configuration of boost half bridge DC-DC converter has been verified for different load conditions(half load and full load).The IPOP system proposed here is comprising of two modules but it can be extended to three or more.The performance of the proposed system along with the control strategy is verified by simulation in MATLAB using Simpower tool.Finally the satisfactory simulation results are obtained.
文摘Multi-modular system plays an important role in power system architecture because low voltage and low power converters can be connected in any combination parallel or series at input/output side in order to obtained any given power system specifications.Multi-modular boost half bridge DC-DC converter in the configuration of input series output parallel has been investigated in this paper.The boost half bridge DC-DC converters are connected in input series output parallel configuration in order to achieve equal input voltage sharing and output current sharing between the converters.This can be achieved with the help of dynamic control scheme which consists of two loops,a voltage loop and a current loop,for each module.Dynamic behavior of multi-modular converter configuration has been observe by varying the load condition.Moreover,the results obtained through multi-modular converter describe that the system has good dynamic and steady state response.Although two converter modules are focused in this paper but it can be modified to any number of modules.
