CAJ | 학술논문

突变量保护在传统电力系统中得到了广泛应用，其对风电系统的适应性值得深入研究。为此，对突变量保护的判据进行分析，得出其最佳适应条件，针对该适用条件结合建模仿真和现场故障录波数据对风电系统进行故障特征分析，进而研究突变量保护对风电接入系统的适应性。理论分析结果表明，背侧系统正序阻抗稳定或正负序阻抗基本相等是突变量保护的最佳应用条件；在风电系统发生故障时，风场侧等值电源的正负序阻抗不相等，且正序阻抗有较大波动，该特征将使风电系统中的突变量保护元件工作于非最佳应用条件，其保护性能大大降低。突变量保护应用于风电系统时应选择牺牲灵敏度的保守整定。
돌변량보호재전통전력계통중득도료엄범응용，기대풍전계통적괄응성치득심입연구。위차，대돌변량보호적판거진행분석，득출기최가괄응조건，침대해괄용조건결합건모방진화현장고장록파수거대풍전계통진행고장특정분석，진이연구돌변량보호대풍전접입계통적괄응성。이론분석결과표명，배측계통정서조항은정혹정부서조항기본상등시돌변량보호적최가응용조건；재풍전계통발생고장시，풍장측등치전원적정부서조항불상등，차정서조항유교대파동，해특정장사풍전계통중적돌변량보호원건공작우비최가응용조건，기보호성능대대강저。돌변량보호응용우풍전계통시응선택희생령민도적보수정정。
Fault component protection is widely applied in traditional power systems, thus it is worthy of deep research for the adaptability of fault component protection to power systems with wind farms. So the protection criterion based on fault components were analyzed theoretically to get the most suitable working condition of this protection. Under this working condition, the fault feature of power systems with wind farms were studied by combining field fault recording data and simulation. The adaptability of fault component protection of power systems with wind farms was researched. The research results show that fault component protection works well only when the positive sequence impedance at back system keeps stable, or the positive sequence impedance at back system is equal to the negative sequence one. While when fault occurs in wind power systems, the positive sequence impedance at wind farm side has large fluctuations and is obviously different from the negative sequence one, and this makes the protection work in unfavorable conditions and significantly reduces the reliability of the protection based on fault component. When the fault component protection is applied to power systems with wind farms, it should be set conservatively at the cost of sensitivity.