Fault Diagnosis of a Voltage-Fed PWM Inverter for a Three-parallel Power Conversion System in a Wind Turbine

Abstract

In this paper, a fault diagnosis method based on fuzzy logic for the three-parallel power converter in a wind turbine system is presented. The method can not only detect both open and short faults but can also identify faulty switching devices without additional voltage sensors or an analysis modeling of the system. The location of a faulty switch can be indicated by six-patterns of a stator current vector and the fault switching device detection is achieved by analyzing the current vector. A fault tolerant algorithm is also presented to maintain proper performance under faulty conditions. The reliability of the proposed fault detection technique has been proven by simulations and experiments with a 10kW simulator.

Design of a Troidal Type Gyro using Repulsive Power of Permanent Magnet and Coriolis Effect

“…또한 교류 전류를 사용하는 자이로 구동기는 센서로부터 검출된 교류 전류의 크기와 위상을 직접 제어하기가 어려우므로, 벡터제어 법 을 사용한다 [7][8] Table 1 Design specification…”

A Simple Open-Circuit Fault Detection Method for a Sparse Matrix Converter

“…현재까지 고장진단 알고리즘에 대한 연구는 인버터 기반 시스템에 적용되어왔다 [9][10][11][12][13][14] . 대부분의 기법은 전류 의 측정을 통해 Park's 벡터 기반으로 연구되었다 [15] .…”

“…3. 스파스 매트릭스 컨버터의 개방 사고 매트릭스 컨버터의 고장 형태는 스위치 단락 사고와 개방 사고로 분류할 수 있다 [12] . 본 논문에서는 스위치의 개방 사고에 대하여 다룰 것이다.…”

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

“…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.…”