We first present a new multi-modular shunt active power filter system suitable for large-capacity compensation. Each module in the system has the same circuit topology, system functionality, and controller design, to ...We first present a new multi-modular shunt active power filter system suitable for large-capacity compensation. Each module in the system has the same circuit topology, system functionality, and controller design, to achieve coordination control among the modules. The module＇s reference signals are obtained by multiplying the total reference signal by the respective distribution coefficient. Next, a novel fault-tolerant approach is proposed based on split-phase control in the a-b-c frame and real-time bus communication. When a phase fault occurs, instead of halting the whole module, the proposed strategy isolates only the faulted bridge arm, and then recalculates the distribution coefficients and transfers the compensation capacity to the same phases of the other normal modules, resulting in a continuous operation of the faulted module and optimization of the remaining usable power devices. Through steady-state analysis of the post-fault circuit, the system stability and control reliability are proven to be high enough to guarantee its engineering application value. Finally, a prototype is established and experimental results show the validity and feasibility of the proposed multi-modular system and its fault-tolerant control strategy.展开更多
Switched-capacitor converters can deliver better performance,power density,and switch utilization compared to inductor-based power converters,but they suffer from current spikes during switching due to capacitor charg...Switched-capacitor converters can deliver better performance,power density,and switch utilization compared to inductor-based power converters,but they suffer from current spikes during switching due to capacitor charge redistribution.This can be solved by methods such as split-phase control,which was developed to address charge redistribution in Dickson SC converters by controlling the charging and discharging of the circuit‟s flying capacitors,such that the equivalent branch voltages line up when the circuit switches states.However,split-phase control is most effective at compensating for charge redistribution when all the circuit‟s flying capacitors are matched in capacitance value.Differences between the capacitance values of the circuit flying capacitors may result in split-phase control not being able to fully compensate for charge redistribution,due to the different charge/discharge rates of the flying capacitors.The work presented in this paper provides an in-depth analysis of the sensitivity of the split-phase Dickson converter to mismatches in flying capacitor values,as well as discussions regarding the design considerations and prototype test results of a split-phase Dickson converter for high-current loads.展开更多
基金supported by the National Natural Science Foundation of China(No.51777186)
文摘We first present a new multi-modular shunt active power filter system suitable for large-capacity compensation. Each module in the system has the same circuit topology, system functionality, and controller design, to achieve coordination control among the modules. The module＇s reference signals are obtained by multiplying the total reference signal by the respective distribution coefficient. Next, a novel fault-tolerant approach is proposed based on split-phase control in the a-b-c frame and real-time bus communication. When a phase fault occurs, instead of halting the whole module, the proposed strategy isolates only the faulted bridge arm, and then recalculates the distribution coefficients and transfers the compensation capacity to the same phases of the other normal modules, resulting in a continuous operation of the faulted module and optimization of the remaining usable power devices. Through steady-state analysis of the post-fault circuit, the system stability and control reliability are proven to be high enough to guarantee its engineering application value. Finally, a prototype is established and experimental results show the validity and feasibility of the proposed multi-modular system and its fault-tolerant control strategy.
文摘Switched-capacitor converters can deliver better performance,power density,and switch utilization compared to inductor-based power converters,but they suffer from current spikes during switching due to capacitor charge redistribution.This can be solved by methods such as split-phase control,which was developed to address charge redistribution in Dickson SC converters by controlling the charging and discharging of the circuit‟s flying capacitors,such that the equivalent branch voltages line up when the circuit switches states.However,split-phase control is most effective at compensating for charge redistribution when all the circuit‟s flying capacitors are matched in capacitance value.Differences between the capacitance values of the circuit flying capacitors may result in split-phase control not being able to fully compensate for charge redistribution,due to the different charge/discharge rates of the flying capacitors.The work presented in this paper provides an in-depth analysis of the sensitivity of the split-phase Dickson converter to mismatches in flying capacitor values,as well as discussions regarding the design considerations and prototype test results of a split-phase Dickson converter for high-current loads.
