Method for Detecting an Open-Switch Fault in a Grid-Connected NPC Inverter System

Choi, Ui-Min; Jeong, Hwanseong; Lee, Kyo‐Beum; Blaabjerg, Frede

doi:10.1109/tpel.2011.2178435

Cited by 216 publications

(97 citation statements)

References 20 publications

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“…(8). As a result of experiments, the error range set to 5% to ensure safe operation during the DC-link voltage sensor fault.…”

Section: Fault Diagnosismentioning

confidence: 99%

“…In the rear-end inverter, a voltage sensor across a DC-link capacitor is essential for DC-link voltage control to measure the DC-link voltage value so that the PV inverter can operate stably. As mentioned previously, since sensors are essential components for the construction of an inverter system, fault diagnosis of the sensors and fault-tolerant control are necessary [7][8][9]. This paper proposes a fault diagnosis and fault-tolerant control of a DC-link voltage sensor for two-stage threephase grid-connected PV inverters.…”

Section: Introductionmentioning

confidence: 99%

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Fault Diagnosis and Fault-Tolerant Control of DC-link Voltage Sensor for Two-stage Three-Phase Grid-Connected PV Inverters

Kim

Lee

et al. 2013

Journal of Electrical Engineering and Technology

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-This paper proposes a method for fault diagnosis and fault-tolerant control of DC-link voltage sensor for two-stage three-phase grid-connected PV inverters. Generally, the front-end DC-DC boost converter tracks the maximum power point (MPP) of PV array and the rear-end DC-AC inverter is used to generate a sinusoidal output current and keep the DC-link voltage constant. In this system, a sensor is essential for power conversion. A sensor fault is detected when there is an error between the sensed and estimated values, which are obtained from a DC-link voltage sensorless algorithm. Faulttolerant control is achieved by using the estimated values. A deadbeat current controller is used to meet the dynamic characteristic of the proposed algorithm. The proposed algorithm is validated by simulation and experiment results.

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“…(8). As a result of experiments, the error range set to 5% to ensure safe operation during the DC-link voltage sensor fault.…”

Section: Fault Diagnosismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fault Diagnosis and Fault-Tolerant Control of DC-link Voltage Sensor for Two-stage Three-Phase Grid-Connected PV Inverters

Kim

Lee

et al. 2013

Journal of Electrical Engineering and Technology

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“…However, the influence of the SFCL on the fault characteristic and relay protection of the DC distribution system has had no research results till now. At present, most of the research about relay protection of the DC distribution system does not take the current limiters into consideration [11][12][13][14][15][16][17][18]. These protection schemes all apply a great short-circuit current and a low voltage.…”

Section: Introductionmentioning

confidence: 99%

Protection Principle for a DC Distribution System with a Resistive Superconductive Fault Current Limiter

et al. 2015

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A DC distribution system, which is suitable for access to distributed power generation and DC loads, is one of the development directions in power systems. Furthermore, it could greatly improve the energy efficiency and reduce the loss of power transportation. The huge short circuit current is always a great threat to the safety of the components, especially the capacitors and diodes. A resistive superconductive fault current limiter (SFCL), which could respond quickly once a fault happens and limit the fault current to a relatively low level, becomes a good solution to this problem. In this paper, the operational principle of the resistive SFCL is introduced first, and then, the DC short-circuit fault characteristic of the DC distribution system with the SFCL is analyzed and the effectiveness of the SFCL verified. In order to realize the selectivity of the protection in the DC distribution system with SFCL, a new transient current protection principle based on Ip (the peak value of the current) and tp (the transient time that the current takes to reach its peak value) is proposed. Finally, a model of a 10-kV DC distribution system with an SFCL is established and simulated in PSCAD/METDC. Simulation results have demonstrated the validity of the analysis and protection principle.

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“…Therefore, systems using switching devices need to diagnose switching device faults and to maintain their operation by tolerance controls. Diagnosis methods for detecting the open-switch faults of NPC-type inverters and rectifiers are proposed in [8]- [11]. To detect open-switch faults, additional devices such as voltage sensors or current patterns are used.…”

Section: Introductionmentioning

confidence: 99%

Tolerance Control for the Inner Open-Switch Faults of a T-Type Three-Level Rectifier

Lee¹,

Lee²

2014

Journal of Power Electronics

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The T-type topology is a three-level topology that has an advantage in terms of its number of switching device and its efficiency when compared to the neutral-point clamped (NPC)-type topology. With the recent increase in the usage of the T-type topology, the interest in its reliability has also increased. Therefore, a tolerance control for a T-type rectifier is necessary to improve the reliability of applications when an open-switch fault occurs. NPC-type rectifiers cannot eliminate input current distortion completely. However, the T-type rectifier is able to restore distorted current. In this paper, a tolerance control for the S x2 and S x3 open-switch faults of a T-type rectifier is proposed where it is advantageous in terms of efficiency when compared with other tolerance controls. The performance of the proposed tolerance control is verified through simulation and experimental results.

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Method for Detecting an Open-Switch Fault in a Grid-Connected NPC Inverter System

Cited by 216 publications

References 20 publications

Fault Diagnosis and Fault-Tolerant Control of DC-link Voltage Sensor for Two-stage Three-Phase Grid-Connected PV Inverters

Fault Diagnosis and Fault-Tolerant Control of DC-link Voltage Sensor for Two-stage Three-Phase Grid-Connected PV Inverters

Protection Principle for a DC Distribution System with a Resistive Superconductive Fault Current Limiter

Tolerance Control for the Inner Open-Switch Faults of a T-Type Three-Level Rectifier

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