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针对基于模块化多电平换流器的多端高压直流输电系统(modular multilevel converter based multi-terminal DC,MMC-MTDC)中,交流区域的负荷波动导致该区域功率短暂不平衡,造成区域内电网频率波动的问题,首先提出一种基于虚拟同步发电机(virtual synchronous generator, VSG)的换流器控制方法。其次,针对在应用VSG策略调频过程中会改变换流站的输出功率,打破直流侧的功率平衡,而导致直流电压偏差过大,当存在线路阻抗时影响尤为明显的问题,将VSG控制与改进下垂控制相结合,形成MMCMTDC系统多站综合协调控制策略。该控制方法不仅可以为交流区域提供频率支持,还能优化直流母线上不平衡功率的分配,提高系统直流电压的稳定性。最后,基于Matlab/Simulink构建5端MMC-MTDC系统进行仿真,仿真结果验证了所提控制策略的有效性。 相似文献
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In order to evaluate and integrate travel time reliability and capacity reliability of a road network subjected to ice and snowfall conditions,the conceptions of travel time reliability and capacity reliability were defined under special conditions.The link travel time model(ice and snowfall based-bureau public road,ISB-BPR) and the path choice decision model(elastic demand user equilibrium,EDUE) were proposed.The integrated reliability was defined and the model was set up.Monte Carlo simulation was used to... 相似文献
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