Transient Stability of Low-Inertia Power Systems With Inverter-Based Generation

被引：24
作者：
He, Changjun [1 ]
He, Xiuqiang [1 ]
Geng, Hua [1 ]
Sun, Huadong [2 ]
Xu, Shiyun [2 ]
机构：
[1] Tsinghua Univ, Beijing Natl Res Ctr Informat Sci & Technol, Dept Automat, Beijing 100084, Peoples R China
[2] China Elect Power Res Inst, Beijing 100192, Peoples R China
来源：
IEEE TRANSACTIONS ON ENERGY CONVERSION | 2022年 / 37卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Index Terms-Energy function; loss of synchronization; low-inertia power systems; phase-locked loop; stability criterion; transient stability. and under loop inverters on; EQUAL-AREA CRITERION; PLL-BASED VSC; SYNCHRONIZING STABILITY; INSTABILITY; CONVERTERS;
D O I：
10.1109/TEC.2022.3185623
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
This study examines the transient stability of low-inertia power systems with inverter-based generation (IBG) and proposes a sufficient stability criterion. In low-inertia grids, transient interactions are induced between the electromagnetic dynamics of the IBG and the electromechanical dynamics of the synchronous generator (SG) under a fault. For this, a hybrid IBG-SG system is established and a delta-power-frequency model is developed. Based on this model, new mechanisms of transient instability different from those of conventional power systems from the energy perspective are discovered. First, two loss-of-synchronization (LOS) types are identified based on the relative power imbalance owing to the mismatch between the inertia of the IBG and SG under a fault. Second, the relative angle and frequency will jump at the moment of a fault, thus affecting the system energy. Third, the cosine damping coefficient induces a positive energy dissipation, thereby contributing to the system stability. A unified criterion for identifying the two LOS types is proposed using the energy function method. This criterion is proved to be a sufficient stability condition for addressing the effects of the jumps and cosine damping coefficient on the system stability. The new mechanisms and effectiveness of the criterion are verified based on simulation results.
引用
收藏
页码：2903 / 2912
页数：10
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