A Simultaneous Diagnosis Method for Power Switch and Current Sensor Faults in Grid-Connected Three-Level NPC Inverters

Xu, Shuiqing; Huang, Wenzhan; Wang, Hai; Zheng, Weixing; Wang, Juxing; Chai, Yi; Ma, Mingyao

doi:10.1109/tpel.2022.3200721

Cited by 66 publications

(28 citation statements)

References 43 publications

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“…Terefore, this scheme includes an optimization formulation. Te optimization work contains objective functions [19][20][21][22][23][24][25][26][27] and constraints [28][29][30][31][32][33][34][35][36]. Also, to apply optimization to the distribution network, smart technologies [37][38][39][40][41] and telecommunications equipment [42][43][44][45] should be used in the network.…”

Section: Mathematical Model Of the Proposed Problemmentioning

confidence: 99%

Optimal Operation of Distributed Generations in Four-Wire Unbalanced Distribution Systems considering Different Models of Loads

Jin

Moradi

Rashidi

2023

International Transactions on Electrical Energy Systems

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The distribution network is generally unbalanced due to the distribution of consumers in different phases and the different status of their energy consumption. Also, in recent years, the utilization of distributed generations (DGs) has flourished in the distribution network, thanks to their favorable operational and environmental benefits. Therefore, it is predicted that the optimal energy management of DGs in the unbalanced distribution network can improve the operation state of the network. Moreover, the consumer load model is generally a combination of constant impedance, constant current, and constant power conditions. Therefore, the current study focuses on the analysis of the operation of unbalanced four-wire distribution systems containing DGs, in which load models are also involved. An optimization structure is established to make the voltage deviation, power loss, neutral wire loss, and voltage unbalance minimized. Limitations of the problem include those related to the network and those concerning operating indices of the system like voltage magnitude and phase angle of buses, power flow through the distribution lines, constraints of operation of DGs, load model, and unbalanced conditions. The problem formed in this study is nonlinear and is solved using sequential quadratic programming (SQP) by implementing it in the GAMS simulation environment. To test the benefits of the introduced approach, a 13-bus distribution system has been adopted so that the optimal operation of DGs in the distribution network has been able to reduce the unbalanced situation of the network compared to the power flow studies. Also, this scheme has improved the operation of network, where energy losses and voltage drop have been reduced compared to power flow studies, and a smooth voltage profile has been extracted.

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Section: Mathematical Model Of the Proposed Problemmentioning

confidence: 99%

Optimal Operation of Distributed Generations in Four-Wire Unbalanced Distribution Systems considering Different Models of Loads

Jin

Moradi

Rashidi

2023

International Transactions on Electrical Energy Systems

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“…Noted that the proposed scheme include an optimization problem. Te optimization model contains objective function [31][32][33][34][35][36][37][38][39][40][41] and constraints [42][43][44][45][46][47][48][49][50][51][52]. To apply this problem on the network, the grid needs to smart devices [53][54][55][56][57][58] and telecommunication equipment [59][60][61][62][63][64][65].…”

Section: 􏽺√√√√√√√√√√√√√√√√√ √􏽽􏽼√√√√√√√√√√√√√√√√√ √􏽻mentioning

confidence: 99%

“…Moreover, the power factor is assumed to be the same and 0.9 for all loads. Te amount of VOLL is also considered equal to 1000 $/MWh [48]. Te maintenance cost for candidate lines is equal to 1% of their construction cost, and for existing lines, it is equal to 0.08 $/kVA.…”

Section: Problem Datamentioning

confidence: 99%

Presenting a Stochastic Model of Simultaneous Planning Problem of Distribution and Subtransmission Network Development considering the Reliability and Security Indicators

Moayed

Shahi

Akbari-Zadeh

et al. 2023

International Transactions on Electrical Energy Systems

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Consumption growth demands power system expansion, and changes in a network lead to changes in operation indices of the upstream network. Hence, to establish a reliable planning of the distribution network, simultaneous planning of the subtransmission network should also be taken into account. It is predicted that this planning impacts different technical indices; therefore, formulation of various technical indices need to be included in the planning model. Therefore, in this study, the stochastic problem model of simultaneous planning of distribution and super distribution network development considering the reliability and security indicators is presented. The aforementioned problem is in the form of an optimization problem whose objective function is to minimize the costs of construction, replacement, operation, maintenance, reliability, and security. Furthermore, the mentioned problem is bound to the equations of power distribution, reliability, and security of voltage in addition to the limitation of network indicators. It is worth mentioning that, in the proposed problem, the active and reactive loads in addition to the operating price are in the form of uncertainty. Thus, the mentioned problem is in the form of a stochastic problem in which the point estimation method is used to evaluate the scenarios. Simultaneous expansion planning of distribution and subtransmission networks along with the placement of distributed generations and capacitors, as well as modeling security and reliability indices, is the novelty of the proposed scheme. In the end, the proposed problem is applied to the test network by GAMS optimization software, and then the capabilities of the proposed problem are extracted. Accordingly, based on numerical results, the expansion of distribution networks imposes considerable cost. Moreover, expansion planning of both distribution and subtransmission networks helps voltage to be in its permissible range, lower power loss, and improve reliability and security to 100%.

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“…When a short circuit fault occurs in the equipment, it can be accurately identified and isolated using relay protection and other devices, and the fault disturbance waveform is completely recorded by a fault recorder. Analysis based on fault disturbance waveform data can further realise diagnostic work such as fault identification and location [57, 58], which is also the focus of conventional fault disturbance waveform data analysis and research. The actual operation experience shows that some equipment failures are continuous and develop gradually.…”

Section: New Application Of Power Disturbance In Power Systemmentioning

confidence: 99%

Power disturbance waveform analysis and proactive application in power systems

Xiao

Zhou

Zhang

et al. 2023

Energy Conversion and Econom

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Power disturbances, defined as the waveform distortion of a power system under normal or abnormal conditions, contain considerable system and equipment state information. Obtaining equipment and system state information from power disturbance is very important to ensure the safety of power grids. To adapt to the development of power electronics, informatisation and digitisation of power systems, several applications with waveform‐recording devices have obtained large amounts of disturbance waveform data, laying an important foundation for the analysis and application of power disturbance waveform data. First, typical disturbance waveform monitoring devices and a disturbance trigger detection algorithm are introduced. Then, disturbances are classified as switching, fault, or abnormal operations, according to the cause. The characteristics of various typical disturbance waveform data were analysed by combining the simulation and measured data. This paper summarises the application analysis of power disturbance waveform data at both the system and equipment levels. Finally, the construction scheme of a power disturbance waveform data monitoring and analysis platform for two different application scenarios was proposed for commutation failure monitoring and medium‐voltage distribution network fault warning. The research conducted here is expected to support the construction of a power disturbance waveform analysis platform.

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A Simultaneous Diagnosis Method for Power Switch and Current Sensor Faults in Grid-Connected Three-Level NPC Inverters

Cited by 66 publications

References 43 publications

Optimal Operation of Distributed Generations in Four-Wire Unbalanced Distribution Systems considering Different Models of Loads

Optimal Operation of Distributed Generations in Four-Wire Unbalanced Distribution Systems considering Different Models of Loads

Presenting a Stochastic Model of Simultaneous Planning Problem of Distribution and Subtransmission Network Development considering the Reliability and Security Indicators

Power disturbance waveform analysis and proactive application in power systems

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