Optimization Strategy of SVC for Eliminating Electromagnetic Oscillation in Weak Networking Power Systems

Huabo Shi, Xinwei Sun, Gang Chen, Hua Zhang, Yonghong Tang, Lin Xu, Lijie Ding, Chengwei Fan and Yin Xu
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Huabo Shi: State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China
Xinwei Sun: State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China
Gang Chen: State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China
Hua Zhang: State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China
Yonghong Tang: State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China
Lin Xu: State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China
Lijie Ding: State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China
Chengwei Fan: State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China
Yin Xu: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Energies, 2019, vol. 12, issue 18, 1-16

Abstract: The central Tibet AC interconnection project (CTAIP), which connects the Tibet power grid and the Sichuan power grid through a long distance transmission line of more than 1400 km, has a significant problem of voltage regulation. In order to improve the voltage regulation performance, six sets of ±60 Mvar static VAR compensators (SVC) were installed in the CTAIP. However, the SVCs may lead to electromagnetic oscillation below 50 Hz while improving voltage regulation capability. In this paper, the electromagnetic oscillation modes and the sensitivity of control parameters of SVC are analyzed. Then, the characteristics and influencing factors of the oscillation are discussed. It was found that there is an inherent electromagnetic oscillation mode below 50 Hz in the ultra-long distance transmission system. The employ of SVCs weaken the damping of this mode. Large proportional gain and integral gain (PI) parameters of SVCs can improve the voltage regulation performance, but weaken the electromagnetic oscillation mode damping. Therefore, a suppression method based on SVC PI parameters optimization is proposed to damp the oscillation. The essential of this method is to use the rising time of voltage response and setting time of SVCs as performance indicators of voltage regulation, and take the damping level of the electromagnetic oscillation mode as the performance index of SVC electromagnetic oscillation suppression ability. Combining the two indicators to form a comprehensive optimization index function, an intelligent optimization algorithm is applied. The process of SVC parameter optimization and the steps of multi-SVC parameter optimization in large power grids is proposed. Finally, PSCAD and real-time digital simulation (RTDS) simulation results verified the correctness of the proposed method. The optimization strategy was applied to CTAIP. The artificial grounding short circuit experimental results proved the effectiveness of the proposed strategy.

Keywords: static VAR compensator (SVC); central Tibet AC interconnection project (CTAIP); weak networking power system; electromagnetic oscillation; reactive power regulation performance; optimization strategy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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