CAJ | 학술논문

柔性直流输电系统非常适合海上风电场并网，但传统交/直流混联系统潮流算法在计算基于VSC-HVDC的风电场并网系统潮流时存在缺陷：直流系统移开后，风电场交流节点变为孤立节点，剩余交流系统的雅可比矩阵不可逆，迭代过程无法进行。针对这一缺陷提出了一种含VSC-HVDC的混联系统（AC/VSC-HVDC）潮流解耦算法：该算法将交、直流系统进行解耦，分别迭代计算。所提算法克服了目前交/直流混联系统潮流计算方法存在的对交流潮流计算程序继承性差、扩展变量多、计算速度慢等缺点；也解决了风电场VSC-HVDC并网系统潮流算法中存在的问题。通过标准算例的计算验证了所提方法的有效性，可以用来对风电场直流并网系统进行稳态潮流分析。
유성직류수전계통비상괄합해상풍전장병망，단전통교/직류혼련계통조류산법재계산기우VSC-HVDC적풍전장병망계통조류시존재결함：직류계통이개후，풍전장교류절점변위고립절점，잉여교류계통적아가비구진불가역，질대과정무법진행。침대저일결함제출료일충함VSC-HVDC적혼련계통（AC/VSC-HVDC）조류해우산법：해산법장교、직류계통진행해우，분별질대계산。소제산법극복료목전교/직류혼련계통조류계산방법존재적대교류조류계산정서계승성차、확전변량다、계산속도만등결점；야해결료풍전장VSC-HVDC병망계통조류산법중존재적문제。통과표준산례적계산험증료소제방법적유효성，가이용래대풍전장직류병망계통진행은태조류분석。
Flexible HVDC system is very suitable for offshore wind farm grid-connection, but when traditional AC-DC power flow algorithm is used to calculate the power flow of grid-connected wind farm based on VSC-HVDC, once removing the DC system, the wind farm becomes isolated communication node, thus the Jacobi matrix of communication system will not be irreversible and iterative process can't be continued. Aiming at these defects, this paper proposes a AC/VSC-HVDC power flow decoupled algorithm containing VSC-HVDC, by which the AC system and DC system are decoupled and computed iteratively. This algorithm overcomes the shortages of existing AC/DC hybrid system power flow calculation algorithm, such as bad inheritance to AC power flow calculation program, much expansion variables, slow calculation speed, and so on, and solves the problem of wind farm VSC-HVDC grid-connected system power folw algorithm. Calculation of standard examples verify that the proposed algorithm is valid and can be used for steady-state power flow analysis of wind farm DC grid-connected system.