摘要
针对目前配电网覆盖广泛、分布式电源量小面多的特点,提出了基于分布式直流电源的配电网交直流同线馈送方案,并从对环境的影响、稳态性能和短路暂态电流三个方面论证了该方案的可行性。通过估算入地直流电流的大小论证得出,大地返回运行方式对环境的影响完全满足行业标准的要求;通过稳态分析了绝缘与网损问题得出,在满足配电线路绝缘水平和输送功率限值要求的前提下应该叠加直流电压的大小,并且论证在此前提下可以获得相对于原交流方式下更高的传输性能;通过建立短路暂态模型仿真分析了该方式下冲击电流与最大短路电流有效值水平,得出其大小均与隔离装置参数相关,合理选择参数不仅可以满足短路电流水平,而且不会对稳态性能造成影响。
Aiming at large-scale being of distribution network and low-capacity but large-quantity of distri.buted sources, a new concept of AC and DC transmitting simultaneously in the same feeder line in distribution network was presented. Analyzed the feasibility from the following three respects. Discussed the influence on the environment of earth return operation system based on the earth-injected DC current estimated, and gained the result that the influence on the environment is small and acceptable. Calculated the superposed DC voltage based on insulation and power loss analysis of this way, further gained the result that the power grid will have better transmission performance under this way. Established the threephase symmetrical short circuit simulation model of this way, the result shows that the impulse current and maximum short-circuit current virtual value vary with the parameter of isolation device, and if this parameter is rationally chosen, above currents will not be very large and power grid＇s steady-state performance will remain.
出处
《电机与控制学报》
EI
CSCD
北大核心
2007年第1期6-11,共6页
Electric Machines and Control
基金
黑龙江省自然科学基金资助项目(E0326)
关键词
配电网
分布式电源
交直流
distribution network
distributed generation
AC and DC
