摘要
本文针对交流电网不同的运行方式和故障情况下的直流系统动态无功需求及功率恢复特性展开研究。以CIGRE直流输电标准测试系统和某实际直流工程系统为对象,研究交流电网支撑能力改变和不同的故障严重程度下直流系统逆变侧换流器功率变化的规律,并搭建简单的多馈入直流系统,分析在多馈入情况下直流功率的特性;总结了各变化规律中的特征点及其出现时间,建立直流系统逆变侧换流器功率恢复时间特性模型;最后将直流功率恢复时间特性模型应用于机电暂态仿真,代替详细直流模型,并将仿真结果与电磁暂态仿真结果对比,验证了其可行性。
Dynamic reactive power demand of HVDC system and its power recovery characteristics are studied under different operation modes and failure cases of AC power grid in this paper.Taking CIGRE test system and a practical HVDC system as study case,the support capacity change of AC power grid and power varying rules of converter at inverter side of DC system under different failure severity degree are studied,and the characteristics of simple multi-infeed system are analyzed.The characteristic points and their occurring time of the change law of inverter power are summarized,and a time-domain series model of HVDC power recovery at inverter side is built.In the end,the time-domain series model of DC power recovery,which represents detail HVDC model,is applied to electromechanical transient simulation.By comparing the results of electromechanical transient simulation and electromagnetic transient simulation,the feasibility of proposed model is verified.
出处
《现代电力》
北大核心
2017年第4期50-58,共9页
Modern Electric Power
关键词
逆变器功率
交流电网运行方式
交流故障
变化规律
功率恢复
power of inverter
operation mode of AC power grid
AC failure
variation law
power recovery model
