CAJ | 학술논문

结合风电运行特点，分析了风电场联络线阻抗圆动作特性，研究了风电场联络线采用传统距离保护存在的问题。建立了风电场联络线测量阻抗的数学模型，研究了运行参数对测量阻抗的影响。仿真研究了故障后风电场联络线两侧电流、电压的频谱特点及其对距离保护的影响。提出联络线采用自适应距离保护的方案。在PSCAD中构建风电场并网仿真模型，对比传统距离保护和自适应距离保护在故障时的动作特性，仿真结果表明在风电场联络线上采用自适应距离保护能够避免传统距离保护的缺陷，适应风电场多变的运行方式，消除风电场侧非工频电流、电压对保护造成的影响。
결합풍전운행특점，분석료풍전장련락선조항원동작특성，연구료풍전장련락선채용전통거리보호존재적문제。건립료풍전장련락선측량조항적수학모형，연구료운행삼수대측량조항적영향。방진연구료고장후풍전장련락선량측전류、전압적빈보특점급기대거리보호적영향。제출련락선채용자괄응거리보호적방안。재PSCAD중구건풍전장병망방진모형，대비전통거리보호화자괄응거리보호재고장시적동작특성，방진결과표명재풍전장련락선상채용자괄응거리보호능구피면전통거리보호적결함，괄응풍전장다변적운행방식，소제풍전장측비공빈전류、전압대보호조성적영향。
Based on operation characteristic of wind farms, the acting characteristic of impedance circle of wind farm tie line is analyzed and the existing defect of traditional distance protection adopted for wind farm tie line is researched. A mathematical model of measured impedance of wind farm tie line is built and the impact of operational parameters on the measured impedance is researched. Frequency spectrum characteristics of post-fault currents and voltages at both sides of the tie line as well as their impacts on distance protection are simulated. A scheme to protect the tie line by adaptive distance protection is proposed. A simulation model of grid-connection of wind farm is constructed by PSCAD and the acting characteristic of traditional distance protection and that of adaptive distance protection during fault are compared, and simulation results show that the defect of traditional distance protection can be avoided by adopting adaptive distance protection to wind farm tie line, besides, the adaptive distance protection can suit to various operational model of wind farms and it can eliminate the impacts of non-power frequency current and voltage on the protection.