Robust Fault Detection, Isolation, and Accommodation of Current Sensors in Grid Side Converters

Papadopoulos, Panayiotis; Hadjidemetriou, Lenos; Kyriakides, Elias; Polycarpou, Marios M.

doi:10.1109/tia.2016.2636815

Cited by 43 publications

(24 citation statements)

References 24 publications

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“…In practical applications, the controller of the GSC is developed within the embedded micro-controller and is designed in discrete-time using fixed sampling rate. Therefore, it is essential to design the proposed simplified GSC model in discrete-time with fix step as well as shown in [18]. For achieving such a discrete-time model, the transfer function of (1), (2) and (4) need to be expressed in discrete-time by using the backward Euler method, as given in (5), (6) and 7respectively.…”

Section: ˆˆ1 ( )Lmentioning

confidence: 99%

Accurate and efficient modelling of grid tied inverters for investigating their interaction with the power grid

Hadjidemetriou

Kyriakides

2017

2017 IEEE Manchester PowerTech

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The power electronic based Grid Side Converter (GSC) is the key technology for interconnecting RES. In order to obtain accurate simulation results, it is important to have a detailed-realistic modelling of GSCs. This requires a very small solver step (i.e., solver period near 1 μs) due to the high-frequency switching operation of these converters. Such a small solver period imposes computational constraints, especially when there is a need to investigate the dynamic power system operation with several installed RESs. This paper proposes a simplified but still very accurate modelling solution for the GSC of RES for performing accurate and dynamic simulations with a significantly larger solver step. A case study is also demonstrated, where the proposed model of the GSC is utilized to investigate the interaction between several distributed RESs (with advanced controllers) and the power grid. Index Terms-Grid side converter, inverter, modelling, renewables, power system, fault ride through. I.

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Section: ˆˆ1 ( )Lmentioning

confidence: 99%

Accurate and efficient modelling of grid tied inverters for investigating their interaction with the power grid

Hadjidemetriou

Kyriakides

2017

2017 IEEE Manchester PowerTech

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“…It is suitable for various kinds of sensor faults. Methods in [29]- [30] can handle multiple current sensor faults by utilizing current residuals generated by state observers.…”

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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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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“…In this respect, the research of fault tolerant control (FTC) has been widely concerned since FTC can keep the closed-loop control performance in case of faults. Some representative results are available [4][5][6][7][8][9][10]. They can be roughly divided into two types: active and passive.…”

Section: Introductionmentioning

confidence: 99%

“…They can be roughly divided into two types: active and passive. Passive fault-tolerant control is to control the faulty system with the same design controller, while active fault-tolerant control is to design the corresponding controller according to different faults, including control reconfiguration [5][6][7], fault compensation [8][9] and fault hiding [10]. In industrial processes, the model based on data may not be consistent with the actual one.…”

Section: Introductionmentioning

confidence: 99%

Genetic-Algorithm-Optimization-Based Predictive Functional Control for Chemical Industry Processes Against Partial Actuator Faults

2020

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Actuator faults, which are common in industrial processes, can make the controller fail to achieve the desired control objectives, which may lead to the degradation of control performance. In order to solve this problem, this paper proposes a predictive functional control based on genetic algorithm optimization. Firstly, an extended dimension discrete switched model is constructed, which consists of a state difference variable, tracking error and a new state variable including tracking error. In this model, the performance index function based on a genetic optimization algorithm is selected, and its parameters are adjusted and the controller is designed. Then, under the obtained control law, the switching signal is designed and the range of uncertainty caused by the actuator fault is given to realize the robustness of the system. At the same time, the corresponding robustly sufficient conditions are presented. The advantage of this design is to avoid the disadvantages of manually adjusting the performance parameters, and the system has good tracking performance. Finally, taking the typical injection molding process of chemical production process as an example, the speed and pressure parameters are controlled, and compared with the traditional control method, the effectiveness and feasibility of the proposed method are verified. INDEX TERMS Chemical industry processes, partial actuator faults, genetic-algorithm-optimization design, predictive functional control

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Robust Fault Detection, Isolation, and Accommodation of Current Sensors in Grid Side Converters

Cited by 43 publications

References 24 publications

Accurate and efficient modelling of grid tied inverters for investigating their interaction with the power grid

Accurate and efficient modelling of grid tied inverters for investigating their interaction with the power grid

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

Genetic-Algorithm-Optimization-Based Predictive Functional Control for Chemical Industry Processes Against Partial Actuator Faults

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