CAJ | 학술논문

由于微电网的网络参数不对称和负荷不平衡，使其三相不对称运行，从而传统的潮流算法不再适用于微电网。为此，提出一种基于稳态序电流的三相微电网潮流计算方法。针对微电网中的不对称线路和几种常见形式的负荷，引入基于电流补偿的线路和负荷的数学模型；并提出基于节点注入电流型的三相微电网潮流算法。将三相潮流问题转换成3个独立的电流方程，对正序应用Newton-Raphson方法进行潮流计算。为验证该算法的正确性和有效性，将计算结果与PSCAD/EMTDC的仿真结果进行对比分析。另外，为验证该方法可处理微电网潮流计算时遇到的线路高R/X比值及环网问题，对CIGRE MV微电网进行潮流计算，结果表明：基于电流注入模型的微电网潮流算法比传统潮流算法在计算速度和收敛性上更具优越性。
유우미전망적망락삼수불대칭화부하불평형，사기삼상불대칭운행，종이전통적조류산법불재괄용우미전망。위차，제출일충기우은태서전류적삼상미전망조류계산방법。침대미전망중적불대칭선로화궤충상견형식적부하，인입기우전류보상적선로화부하적수학모형；병제출기우절점주입전류형적삼상미전망조류산법。장삼상조류문제전환성3개독립적전류방정，대정서응용Newton-Raphson방법진행조류계산。위험증해산법적정학성화유효성，장계산결과여PSCAD/EMTDC적방진결과진행대비분석。령외，위험증해방법가처리미전망조류계산시우도적선로고R/X비치급배망문제，대CIGRE MV미전망진행조류계산，결과표명：기우전류주입모형적미전망조류산법비전통조류산법재계산속도화수렴성상경구우월성。
Due to the asymmetry of network parameters and load imbalance of microgrid, which make three-phase asymmetric operation exist in the microgrid, traditional power flow algorithm is no longer applicable to the microgrid. Therefore, a three-phase power flow calculation method based on steady-state sequence current is proposed. Mathematical model for lines and load based on current compensation is introduced for asymmetric transmission lines and common forms of load in microgrid. And a node current injection-based three-phase power flow calculation method is proposed. Those three-phase power flow problems are converted into three separate current equations, and Newton-Raphson method is used to calculate sequence power flow. In order to validate the accuracy and effectiveness of the proposed algorithm, the calculation results are compared with the simulation results using the PSCAD/EMTDC software tool. And in order to validate that the method can solve problems of highR/Xratio of the line and ring network which are encountered during the power flow calculation of the microgrid, power flow calculation of CIGRE MV microgrid is made. Calculation results show that the power flow algorithm for microgird based on the current-influx model is found to be superior to the traditional power flow calculation method in calculation speed and convergence.