CAJ | 학술논문

使用PSCAD／EMTDC软件对大型区域电网的局部线路和附近区域进行电磁暂态分析，需要将区域电网分为内部网络和外部网络2部分，对外部网络进行等值简化。传统的网络等值方法需要建立被等值系统的节点导纳矩阵，通过高斯消元法化简网络，计算工作量巨大。为此提出了基于PSASP短路计算的区域电网等值方法。通过全部边界节点的同时短路获得注入电流源参数。然后采用边界节点逐一短路，获得与边界节点数目相同的节点电压方程组，联立求解出节点导纳矩阵。新方法直接求解边界节点对应参数，计算量小。含特高压线路的大型区域电网仿真分析表明，PSASP原网络和PSCAD／EMTDC等值网络的短路电流基本一致，验证了等值方法正确性。最后分析比较了新方法与传统的静态等值方法，探讨了新方法的适用范围。
사용PSCAD／EMTDC연건대대형구역전망적국부선로화부근구역진행전자잠태분석，수요장구역전망분위내부망락화외부망락2부분，대외부망락진행등치간화。전통적망락등치방법수요건립피등치계통적절점도납구진，통과고사소원법화간망락，계산공작량거대。위차제출료기우PSASP단로계산적구역전망등치방법。통과전부변계절점적동시단로획득주입전류원삼수。연후채용변계절점축일단로，획득여변계절점수목상동적절점전압방정조，련립구해출절점도납구진。신방법직접구해변계절점대응삼수，계산량소。함특고압선로적대형구역전망방진분석표명，PSASP원망락화PSCAD／EMTDC등치망락적단로전류기본일치，험증료등치방법정학성。최후분석비교료신방법여전통적정태등치방법，탐토료신방법적괄용범위。
To perform electromagnetic transient analysis on a part of a large-scale regional power network by PSCAD/EMTDC, the regional power network has to be divided into two parts, namely the internal network and the external network, and then the equivalent simplification of the external power network is carried out. It is necessary for traditional equivalent methods to establish nodal admittance matrix of the external power network and simplify the network by Gaussian elimination, and it leads to heavy calculation burden. For this reason an equivalent method for regional power network based on short-circuit calculation by Power System Analysis Software Package （PSASP） is proposed, that is, by means of simultaneous short-circuit of all boundary nodes the parameters of injection current sources can be obtained; then by means of short-circuiting boundary nodes one by one, the nodal voltage equations, whose number is the same as the number of boundary nodes, are attained, thus the nodal admittance matrix can be simultaneously solved. Adopting the proposed method, corresponding parameters of boundary nodes can be directly solved and the calculation burden is light. Results of simulation of large-scale regional power network containing UHV transmission line show that the short-circuit current of the original regional power network calculated by PSASP basically conforms to that calculated by equivalent network based on PSCAD/EMTDC, thus the correctness of the proposed method is verified. Finally, the proposed method is compared with traditional static equivalent methods, and the application scope of the proposed method is discussed.