逆变器潮流计算节点类型等效及鲁棒下垂节点的潮流计算
Equivalence of Inverter Node Type in Power Flow Calculation and Power Flow Calculation for Robust Droop Control Node
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摘要: 潮流计算在电力系统分析中占据着基础性的地位。微电网的潮流计算往往需要利用节点类型等效的方法将逆变器转换成PQ和PV类型的节点。但节点类型等效的条件与逆变器控制策略密切相关。文中从微电网潮流计算的角度,通过比较逆变器滤波器的参数与微电网线路阻抗,总结了适宜进行直接等效的逆变器控制策略的特点。并针对近年来出现的鲁棒下垂控制器,建立了鲁棒下垂控制器的潮流计算模型。基于牛顿—拉夫逊法,给出了潮流计算的修正方程,统一求解系统潮流。最后,以欧盟20节点自治运行微电网为例,验证了算法的有效性。Abstract: Power flow calculation plays an important role in the power system analysis.In the power flow calculation of microgrid,inverter nodes often need to be converted into PQor PVnodes by using the node type equivalent method.However,the conditions of node type equivalence are closely related to the strategy of inverter control.Comparing to filter parameters of inverters and transmission line impedance of microgrid,this paper summarizes the characteristics of inverter controller suitable for power flow calculation of microgrid.For the robust droop controller presented in recent years,the power flow calculation model is established.Based on the Newton method,the modified equation of power flow calculation is set up to solve the power flow.Finally,a European 20-node autonomous microgrid is set up to verify the effectiveness of the algorithm.
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