【摘要】 对基于二极管整流器的低成本混合直流换流器的停机策略进行了研究。将辅助换流器的停机过程分为能量回馈与能量耗散阶段，能量回馈阶段通过主动控制,将子模块电容上储存的部分能量经直流母线回馈到电网中；能量耗散阶段通过耗散电阻依次对谐振电容和子模块电容放电，并推导了放电电流、电容电压和放电时间的计算方法，给出了耗散电阻的设计方法。所提停机策略能够快速有效实现换流器电容放电，且不需要高耐压大容量的耗散电阻，有利于工程实现。最后在Matlab/Simulink中搭建了相应的仿真模型，仿真结果验证了停机策略的有效性。更多还原

【Abstract】 A shutdown strategy for a low-cost hybrid DC converter based on diode rectifier is studied. The shutdown process of the auxiliary converter is divided into an energy feedback stage and an energy dissipation stage. At the energy feedback stage, part of the energy stored in the capacitors of sub-modules is fed back to grid through the DC transmission line under the active control. At the energy dissipation stage, the resonant capacitor and the capacitors of sub-modules are discharged in sequence through a discharging resistor. The calculation methods for the discharging current, capacitance voltage, and discharging time are derived, and the design method for the discharging resistor is also given. The capacitors of the auxiliary converter can be discharged quickly and efficiently under the proposed shutdown strategy without a high-voltage and large-capacity discharging resistor, which is conducive to the realization in engineering projects. Finally, a simulation model is constructed in Matlab/Simulink, and the validity of the shutdown strategy is verified by simulation results.更多还原