基于机器学习的级联h桥逆变器的最佳主动无监督故障检测
Ashkan Safari1, Mohammad Hosein Tehranidoost2, Mehran Sabahi2
1Faculty of Electrical and Computer Engineering , University of Tabriz , Tabriz, Iran. ashkansafari@ieee.org.
Scientific reports
|May 3, 2025
概括
本研究介绍了一种孤立森林 (IF) 机器学习模型,用于可靠地检测多级逆变器 (MLI) 的故障. 投资理财模型提供了一种高效,无监督的方法来识别系统故障,提高工业应用的可靠性.
科学领域:
- 电气工程 电气工程
- 电力电子 电力电子 电力电子
- 机器学习 机器学习
背景情况:
- 多级逆变器 (MLI) 对高压,高功率应用至关重要,但由于更多的开关导致故障发生的增加,它们的可靠性受到挑战.
- 有效的故障检测对于工业环境中的MLI可靠性至关重要,但由于参数不确定性,传统的基于物理和基于模型的方法面临挑战.
- 由于MLI系统的复杂性,需要先进的故障检测技术来确保运行完整性.
研究的目的:
- 提出和评估一个高效的,无监督的机器学习模型,用于MLIs中的故障检测.
- 为了证明隔离森林 (IF) 算法的有效性,用于识别17级级联H桥 (CHB) 逆变器中的故障.
- 用关键绩效指标比较IF模型与其他方法的表现.
主要方法:
- 实现隔离森林 (IF) 算法,这是用于异常检测的无监督机器学习技术.
- 在各种故障条件下模拟一个17级级联H桥 (CHB) 逆变器.
- 使用F1-Score,精度,回忆和准确度指标对IF模型性能进行比较分析.
主要成果:
- 隔离森林 (IF) 模型在模拟的17级CHB逆变器中检测故障方面表现出高效率和准确性.
- 与基于F1-Score,精度,回忆和准确性的其他方法相比,IF模型取得了更高的性能.
- 拟议的无监督方法要求MLI系统的计算复杂性最小.
结论:
- 隔离森林 (IF) 模型为MLIs提供了一个准确而高效的无监督故障检测解决方案.
- 这种方法为完全自动化和自我修复的工业动力系统铺平了道路.
- 在故障检测方面,IF模型的有效性提高了MLI系统的整体可靠性和性能.
相关概念视频
01:21Three-Phase Short Circuit—Unloaded Synchronous Machine
98
Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
98
01:24Bus Impedance Matrix
82
Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
82
01:21Power System Three-Phase Short Circuits
60
Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
60
01:25Multimachine Stability
101
Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
101
01:18Fault Types
57
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
For line-to-line faults occurring between phases B and C, the...
57
01:22Series R—L Circuit Transients
74
In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
74