Research on Double-Deck Traceability Identification Method of Commutation Failure in HVDC System

Abstract

In AC/DC hybrid power system, AC system failures and commutation valve trigger pulse disorder will lead to commutation failure, which may lead to DC voltage fluctuations, power transmission interruption and other serious consequences. In order to accurately and effectively identify the specific causes of commutation failures, a double deck traceability identification method is proposed in this paper. The surface identification based on wavelet entropy and affinity propagation (AP) algorithm can distinguish internal and external faults. The deep identification uses convolution neural network which can further lock the specific cause of commutation failures. In this paper, 1) the various factors leading to commutation failures are analyzed; 2) the fault feature space consists of the wavelet analysis components of DC voltage signal, and the AP algorithm is used to identify the surface source; 3) the DC current, AC voltage and current signals are added into the sample matrix of fault time-space, and the convolution neural network is used to identify the deep traceability. Finally, the accuracy of the method is verified by using the typical HVDC model.

Disturbance Frequency Trajectory Prediction in Power Systems Based on LightGBM Spearman

“…Feature engineering enhances data-driven model performance by constructing a more effective feature set through processes such as feature extraction, feature selection, and feature transformation. Power system data analysis involves a large amount of correlated data, and using all as input increases model computational complexity, causing feature redundancy and reducing model training efficiency and accuracy [21]. Feature selection algorithms are now widely used in power system analysis [22][23][24], with reference [25] building a critical feature subset of the power grid based on analyzing key power flow sections and feature combination effects.…”

Multiple DC Modulation Coordination Strategies Based on Transient Energy Function and Deep Deterministic Policy Gradient Algorithm

“…However, with the introduction of voltage source converter based high voltage direct current transmission (VSC-HVDC) technology based on a modular multilevel converter (MMC), a line-commutated converter (LCC) combined with MMC forms a new direct current transmission topology [3][4][5][6]. With the increasing scale of power grid interconnection, inter-regional low-frequency oscillation caused by system interconnection has gradually become one of the bottlenecks that trouble the safe and stable operation of power grid and limit the transmission capacity of power grid [7][8][9][10].…”

Method of Multi-Energy Complementary System Participating in Auxiliary Frequency Regulation of Power Systems

“…Traditional thermal power-plant frequency regulation exhibits drawbacks such as slow responses and limited ramping capability; it is thus unable to meet the stability and FR demand of the grid [7]. To ensure the stable operation of interconnected regional power systems, the integration of various flexible energy sources into the grid is required [8][9][10].…”