CAJ | 학술논문

为实现基于响应的电网暂态稳定实时分析，提出一种基于相平面上转速差-功角差变化趋势辨识电网暂态功角稳定性的方法。以单机无穷大系统为例研究并证明了转速差-功角差变化趋势与暂态功角稳定的关系，从而揭示了机械动能与电势能相互转化时系统维持同步运行的表现形式。针对多机系统，利用双机等值思想进行推广应用。为克服虚拟的等效惯量中心计算得到的运动轨迹一阶导数并不平滑的缺点，采用最小二乘法将其拟合成二次函数抛物线形式，判断其变化趋势，从而识别系统暂态稳定性。通过单机无穷大系统和新英格兰10机39节点系统算例，验证了所提方法的准确性。计算仅使用发电机的功角和转速量，方便、简洁、快速，具有良好的应用前景。
위실현기우향응적전망잠태은정실시분석，제출일충기우상평면상전속차-공각차변화추세변식전망잠태공각은정성적방법。이단궤무궁대계통위례연구병증명료전속차-공각차변화추세여잠태공각은정적관계，종이게시료궤계동능여전세능상호전화시계통유지동보운행적표현형식。침대다궤계통，이용쌍궤등치사상진행추엄응용。위극복허의적등효관량중심계산득도적운동궤적일계도수병불평활적결점，채용최소이승법장기의합성이차함수포물선형식，판단기변화추세，종이식별계통잠태은정성。통과단궤무궁대계통화신영격란10궤39절점계통산례，험증료소제방법적준학성。계산부사용발전궤적공각화전속량，방편、간길、쾌속，구유량호적응용전경。
In order to realize the response-based real-time transient stability analysis of power system, a new identification method is proposed, which is based on the trend of rotor speed difference-rotor angle difference. Firstly, a one-machine infinite bus system (OMIB) is used to discuss the relationship between the trend of rotor speed difference-rotor angle difference and transient stability, and indicate the system stability behavior in the inter-conversion of mechanical and electrical energy. Furthermore, this idea is applied to multi-machine system by single machine equivalent (SIME) method. In order to overcome the defect that the first-order partial derivative of the trajectory is unsmooth, the least square method is adopted. The accuracy and effectiveness of the proposed method are demonstrated based on one-machine infinite bus system and New England 10-generator 39-bus system. Needing only the rotor angle and rotor speed of generators, the proposed method is convenient, concise and fast, with good application prospects.