Improving grid connected hybrid generation system supervision with sensorless control

Abbes

2022

Wind Engineering

This paper assesses the effect of an inter-turn short circuit fault in stator windings of a Permanent Magnet Synchronous generator (PMSG)-based variable speed wind energy conversion system (WECS) connected to the grid by a power converters interface. The objective is to assess the impact of the fault on the WECS performances. This study has two tasks. The first one details a dynamic modeling of different subsystems of the WECS. The mathematical model of the defective PMSG is also set up. The second one presents an appropriate control strategy for the power converters interface. The control of the PMSG-side converter aims to ensure the operation in maximum power point tracking. The grid-side control was also established by controlling the active and reactive powers to ensure the operation in unity power factor and keeping the DC bus voltage stable. The performance of the control design was tested under healthy and faulty conditions.

“…Each phase is constituted by an inductor and a resistance in series. The model of the used RL filter is defined by expression ( 14) in the d-q frame (Boukettaya and Naifar, 2015):…”

Section: Modeling Of the Pmsgmentioning

confidence: 99%

Impact of a PMSG inter-turn short-circuits fault on a grid-connected variable-speed wind energy conversion system

Abbes

2022

Wind Engineering

Mathematical Problems in Engineering

“…Te sensorless control applied to the MG-PGS improves the performance of the global control. Te PMSM mechanical speed, stator resistance, and inductance could be estimated precisely, and the dynamical property of the system is obviously improved [58]. Due to the low counter electromotive force of the PMSM, the high-frequency signal injection method is used to achieve a more accurate position estimation efect at zero speed and low speed.…”

Section: Research On Control Technology Fault Protection Andmentioning

confidence: 99%

Research on Direct Drive Technology of the Permanent Magnet Synchronous Motor for Urban Rail Vehicles

Wang

Cheng-long

Liu

et al. 2022

Compared with the traditional gear reduction mechanism of the asynchronous motor, the permanent magnet synchronous motor (PMSM) direct drive technology has obvious advantages and has attracted increasing attention. We analyzed the advantages of the PMSM direct drive technology and put forward the hollow shaft structure of the coupling to reduce the impact force of the wheel and rail, additional noise, vibration, and loss. We deeply studied the topology and mathematical model of the PMSM. To keep the maximum running speed unchanged, it is necessary to conduct a flux weakening control above the rated speed to increase the speed regulation range of the PMSM. To prevent frequent switching jitter at the transition point and smooth the transition between different weak magnetic fields, we designed a new flux-weakening controller to control the current. Simulation results have been presented to verify the proposed approach efficiency. Taking the PMSM system train on Suzhou Metro line 3 as an example, the on-site energy consumption test was carried out. The energy consumption of the PMSM direct drive and asynchronous motor gear mechanism was compared. The energy consumption of the PMSM direct drive is increased by 16.50%. The flexible plate coupling can alleviate the adverse effects of vibration and improve the reliability of train operation. Finally, we put forward the technical difficulties and challenges of the PMSM direct drive technology. We need to optimize the mass distribution of the direct drive bogie to improve the dynamic performance of the bogie, the heat dissipation conditions, and the accurate control of the PMSM. It will have reference value for the development of the PMSM direct drive in the future.

“…In this mode, the RPG is used to supply loads, for example the electrification of isolated sites which are difficult to supply by the main electrical network . Another mode of operation of the AG is the grid connected mode . In this operation mode, the RPG is not considered as an energy source only; it also contributes to participate in the system service.…”

Section: Introductionmentioning

confidence: 99%

“…9 Another mode of operation of the AG is the grid connected mode. 10 In this operation mode, the RPG is not considered as an energy source only; it also contributes to participate in the system service. Among them: participating in the grid frequency and voltage settings, minimizing harmonics, compensating reagents, and also improving the power factor.…”

Section: Introductionmentioning

confidence: 99%

A flexible control strategy of a renewable active generator to participate in system services under grid faults

Abbes

Int Trans Electr Energ Syst

et al. 2018

Summary This paper was interested in flexible control of an active generator (AG) that includes a wind turbine, battery‐supercapacitors hybrid storage system, and loads. This AG can operate according to grid stability in islanded, synchronization, and grid‐connected modes. The developed control strategy comprises two principal control tasks: the first one is a two‐layer power management algorithm (PMA). The response of two‐layer PMA enables to detect the islanding mode in case of grid fault and to monitor the renewable power generation into nine operating modes according to the state‐of‐charge of each storage system. The second task is droop control. This droop control aims to reduce grid voltage and frequency variations. It controls exchanged powers with grid to ensure its stability. It also ensures a continuous supply of load in case of grid fault. The system is simulated using MATLAB software, and results are provided in order to show the feasibility of this control strategy.