CAJ | 학술논문

大规模风电基地通过联络线接入电网，使得风电并网小扰动稳定问题更加突出，建立对应的小扰动稳定分析的数学模型并有效等值是稳定性分析的基础。详细分析推导了双馈风电机组轴系系统、变桨系统和发电机模型，建立其小扰动稳定分析状态方程。基于主导模式，推导采用最优线性组合理论的等值模型计算方法，获得阶次降低后的等值模型表达式。实例中以降阶前后状态变量动态特性的拟合度论证等效模型的准确性，结果表明合理选择主导模式可以有效利用最优线性组合法获得等值模型。
대규모풍전기지통과련락선접입전망，사득풍전병망소우동은정문제경가돌출，건립대응적소우동은정분석적수학모형병유효등치시은정성분석적기출。상세분석추도료쌍궤풍전궤조축계계통、변장계통화발전궤모형，건립기소우동은정분석상태방정。기우주도모식，추도채용최우선성조합이론적등치모형계산방법，획득계차강저후적등치모형표체식。실례중이강계전후상태변량동태특성적의합도론증등효모형적준학성，결과표명합리선택주도모식가이유효이용최우선성조합법획득등치모형。
Large-scale wind parks gain access to grids via tie lines,which renders the small signals of wind power grid integration more unstable.The underlying principle for stability analysis is to build a mathematical model for analyzing small signals and to provide effective equivalents. This paper presents a detailed analysis and deduction of doubly fed induction generator unit shaft system,a pitch system,and a generator model.A state equation of stability is thus given. Based on the dominant mode,equivalent model calculation method is deduced using optimal linear combination theory,which enables to obtain equivalent model expression after the order is reduced.The accuracy of the model is proved by the fitting degree of dynamic characteristics before and after the order reduction.The results show that equivalent model for the dominant mode can be obtained by applying optimal linear combination method.