CAJ | 학술논문

基于计及阻抗不均的等值两机系统模型，采用向量图和数值计算相结合方法研究了线路阻抗不均导致振荡中心偏移的规律。定义两机系统总阻抗模值的中点为系统中心。在系统功角由0～360°摆开周期中，系统阻抗角不等可导致振荡中心动态迁移：当系统中心落在联络线上时，振荡中心仅在联络线内部动态迁移。当系统中心落在联络线任一侧系统等值阻抗上时，存在两种迁移规律，一是仅在联络上动态迁移，二是振荡中心在联络线和系统中心所在的联络线一侧等值阻抗上动态迁移。系统失步中心位置(振荡周期内电压过零点)不受阻抗不均的影响，不影响失步中心位置的定位，但失步中心并非只在系统功角摆开至180°时出现。
기우계급조항불균적등치량궤계통모형，채용향량도화수치계산상결합방법연구료선로조항불균도치진탕중심편이적규률。정의량궤계통총조항모치적중점위계통중심。재계통공각유0～360°파개주기중，계통조항각불등가도치진탕중심동태천이：당계통중심락재련락선상시，진탕중심부재련락선내부동태천이。당계통중심락재련락선임일측계통등치조항상시，존재량충천이규률，일시부재련락상동태천이，이시진탕중심재련락선화계통중심소재적련락선일측등치조항상동태천이。계통실보중심위치(진탕주기내전압과영점)불수조항불균적영향，불영향실보중심위치적정위，단실보중심병비지재계통공각파개지180°시출현。
The regulation and mechanism of oscillation center migration are studied by integrating vector graph and numerical calculation method, based on a two-machine equivalent system model considering impedance inequality. The midpoint of total impedance absolute is defined as the system center. Research results show that impedance inequality will cause migration of oscillation center during an oscillation cycle in the power system angle from 0° to 360° swing cycle. Oscillation center just migrates only inside contact lines when the system center is located at the contact lines. When the system center is located at equivalent system impedance at either end of contact lines, there are two kinds of migration, one is only inside contact lines, the other is the oscillation center may migrate in lines, but more likely migrationes between the lines and the equivalent system impedance that the system center is located. The position of out-of-step center is not affected by the impedance inequality, but out-of-step center occurs not only when the system angle is 180°.