感应电动机参数选择对动态无功需求的影响

针对电动机负荷在故障恢复过程中无功需求大幅度增长的问题,以单机带负荷系统为研究对象,采用感应电动机负荷和静态负荷并联构成的负荷模型,利用电磁暂态仿真软件PSCAD/EMTDC,通过改变电动机负荷比例、电动机参数等方法,探讨综合负荷在出现扰动之后的动态响应特性。分析结果表明:在相同负荷水平下,含水泵的综合负荷模型无功需求增长幅度最大,系统存在功率失稳风险。

Influence of parameter selection of induction motor on dynamicreactive power demands

Aiming at the problem of the reactive power demands in motor load large increasingduring the fault recovery, takes the single unit load system as the research subject , adopts the loadmodel consisted of induction motor load and static load parallel, utilizes electromagnetic transientsimulation software PSCAD/EMTDC, by changing the load proportion and motor parameters, discussesthe comprehensive load dynamic response characteristic after the disturbance appearing. The analysisresult shows that under the same load level, the reactive power demands increase of comprehensiveload model containing the water pump is the largest, so the system exists the risk of powerunsteadiness.