A Comparative Study of Two Diagnostic Methods Based on the Switching Voltage Pattern for IGBT Open-Circuit Faults in Voltage-Source Inverters

Wang, Yuxi; Li, Zhan; Xu, Mai

doi:10.6113/jpe.2016.16.3.1087

Cited by 23 publications

(10 citation statements)

References 33 publications

(28 reference statements)

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“…1 The grid-tied 3P3W inverter with two current sensors identification with less data, but they rely on circuit operation analysis or circuit models, so they are suitable for simpler and well-defined systems. Circuit-driven methods can be categorized as voltage signal based [11]- [14], current signal based [15]- [18] and model based [19]- [22]. With extra sampling and diagnosis circuits, voltage signal based methods introduced in [11]- [12] can detect the IGBT OC faults within one switching period.…”

Section: Introductionmentioning

confidence: 99%

“…Circuit-driven methods can be categorized as voltage signal based [11]- [14], current signal based [15]- [18] and model based [19]- [22]. With extra sampling and diagnosis circuits, voltage signal based methods introduced in [11]- [12] can detect the IGBT OC faults within one switching period. Current signal based methods [15]- [18] and model based methods [19]- [22] can diagnose IGBT OC faults with existing signals.…”

Section: Introductionmentioning

confidence: 99%

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A Fast Diagnosis Method for Both IGBT Faults and Current Sensor Faults in Grid-Tied Three-Phase Inverters With Two Current Sensors

Zhan

Wheeler

Watson

et al. 2020

IEEE Trans. Power Electron.

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This paper considers fault detection in the case of a three-phase three-wire (3P3W) inverter, when only two current sensors are used to save cost or due to a faulty current sensor. With two current sensors, there is no current method addressing the diagnosis of both IGBT open-circuit (OC) faults and current sensor faults. In order to solve this problem, this paper proposes a method which innovatively combines two kinds of diagnosis variables, line voltage deviations and phase voltage deviations. The unique faulty characteristics of diagnosis variables for each fault are extracted and utilized to distinguish the fault. Using an average model, the method only needs the signals already available in the controller. Both IGBT OC faults and current sensor faults can be detected quickly in inverter mode and rectifier mode, so that the converter can be protected in a timely way to avoid further damages. In addition, error-adaptive thresholds are adopted to make the method robust. Effects such as system unbalance is analyzed to ensure that the method is robust and feasible. Simulation and experimental results are used to verify and validate the effectiveness of the method. NOMENCLATURE vxy (x,y =a,b,c) Line voltages between phase X and phase Y vxN Phase voltage of phase X ix Current of phase X VXY (X,Y = A, B, C) Bridge arm pole-to-pole voltage between phase X and phase Y VXL Bridge arm pole voltage of phase X VNL Voltage between output neutral point and lower point of DC bus Lx Filter inductance of phase X Rx Equivalent resistance of phase X γ Actual value of signal γ γ^ Sampled value of signal γ γ* Estimated value of signal γ Δγ^ Deviation between γ and γ^ Δγ* Deviation between γ and γ*

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Fast Diagnosis Method for Both IGBT Faults and Current Sensor Faults in Grid-Tied Three-Phase Inverters With Two Current Sensors

Zhan

Wheeler

Watson

et al. 2020

IEEE Trans. Power Electron.

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“…For signal-based approaches, several diagnosis schemes utilising voltage signals have been proposed for the open-circuit fault detection, which give a fast detection speed and independency on the system parameters [14][15][16][17][18][19]. However, these methods usually require additional voltage sensors.…”

Section: Introductionmentioning

confidence: 99%

“…Thereafter, the system will stop eventually, which incurs higher costs for repairing. So, the online diagnostic techniques for open‐circuit faults of the IGBTs have been introduced for the last decades [4–29].…”

Section: Introductionmentioning

confidence: 99%

Detection and identification of multiple IGBT open‐circuit faults in PWM inverters for AC machine drives

Bae

Lee

Nguyễn

2019

IET Power Electronics

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This study proposes a new scheme for online detection and identification of single and multiple insulated-gate bipolar transistor (IGBT) open-circuit faults in three-phase pulse-width modulation (PWM) inverters of AC machine drives, which is based on Park's vector of machine phase currents. First, the switch open-circuit faults are detected by monitoring dwell times of the vector of the actual phase currents expressed in the stationary reference frame in each sector, where the normalisation of the current to its reference value is utilised, by which the immunity to the false alarms in transient conditions is improved significantly. Then, the IGBT open-circuit faults are identified, where leg open-circuit conditions are in the first place determined based on the average values of the normalised line-to-line currents. Next, the single open-circuit IGBT is located from the polarity of the corresponding phase current. By the proposed diagnosis method, the fault detection time is at the longest about 52.3 and 54% of a fundamental period in the simulation and experimental tests, respectively, and the 27 possible cases of IGBT open-circuit faults combined for all IGBTs in the inverter can be identified. In addition, this algorithm can be implemented without any additional hardware and computational burden.

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“…A lot of papers have been published focusing on IGBT OC fault diagnosis. These methods are mainly voltage signal based [2]- [4], current signal based [5]- [7] and model based [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

A Nonintrusive IGBT Open-Circuit Fault and Current Sensor Fault Diagnosis Method for Grid-Tied Three-phase Three-Wire Inverter with Two Current Sensors

Wheeler

Watson

et al. 2019

2019 IEEE Energy Conversion Congress and Exposition (ECCE)

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In some cases, only two current sensors are available in three-phase three-wire (3P3W) inverters. This occurs when one of three sensors is faulty, or the inverter is equipped with only two sensors to save cost. There has been no method addressing the diagnosis of both IGBT open-circuit faults and current sensor faults in the 3P3W inverter with only two current sensors. In order to solve this problem, a nonintrusive method based on average output voltage deviations is proposed. The deviations between the measured and estimated output line and phase voltages are utilized to detect and locate the fault. With average model, this method can diagnose the fault fast with only signals available in the controller. Therefore, no extra sampling or diagnosing circuits are needed. Besides, the error-adaptive thresholds are adopted to ensure the robustness. Finally, experimental results verified the effectiveness.

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A Comparative Study of Two Diagnostic Methods Based on the Switching Voltage Pattern for IGBT Open-Circuit Faults in Voltage-Source Inverters

Cited by 23 publications

References 33 publications

A Fast Diagnosis Method for Both IGBT Faults and Current Sensor Faults in Grid-Tied Three-Phase Inverters With Two Current Sensors

A Fast Diagnosis Method for Both IGBT Faults and Current Sensor Faults in Grid-Tied Three-Phase Inverters With Two Current Sensors

Detection and identification of multiple IGBT open‐circuit faults in PWM inverters for AC machine drives

A Nonintrusive IGBT Open-Circuit Fault and Current Sensor Fault Diagnosis Method for Grid-Tied Three-phase Three-Wire Inverter with Two Current Sensors

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