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Due to the current constraint of linear induction machine (LIM) and voltage constraint of inverter, the output thrust of LIM is limited. So, in order to make LIM output thrust as large as possible within current and voltage limit, firstly, the maximum thrust per ampere (MTPA) is used to achieve maximum thrust with limited current in low speed. Secondly, with the speed of LIM increasing, the voltage...
There is an increasing need to model large networks of inverter-based distributed generation due to the limits of existing simulation tools. A deliberate enforcement of intra-feeder coherency between adjacent droop-controlled inverters is a worthwhile objective, as phase angle coherency will allow for a deliberate partitioning of fast and slow dynamics within the network. This partitioning, in turn,...
An increased deployment of distributed generation in recent years has contributed to creation of meshed power networks usually seen as a way to improve power flow management capability. Also, power electronics converters have been commonly used to interface distributed resources to the grid, yet their impact on the network stability has not been sufficiently explored. In this paper the stability of...
Synchronverters are inverters that mimic the behavior of synchronous generators. In this paper, we propose modifications to the synchronverter algorithm to improve its stability and performance. The proposed modifications are implemented in software and do not require any changes in the inverter hardware. The first two modifications concern the control of the virtual field current in the synchronverter...
In most large-scale grid-tied photovoltaic (PV) plants, central inverter configurations are used, mainly due to higher converter efficiency and lower cost per kW. However, compared to other configurations, its Maximum Power Point Tracking (MPPT) efficiency is the lowest since it is the less distributed configuration. Under non-uniform conditions, as mismatch caused by aging and/or partial shading,...
Both sides of the conversion cycle (charge and discharge) are used in push-pull converters as opposed to single-ended converters. This increases their efficiency. Push-pull converters have been used successfully in charge of capacitive storage devices, automatic control systems and charging batteries, pulse and converter technology as well as in the secondary power sources to power various electrical...
The transfer efficiency of WPT system is affected seriously by the AC internal resistance of power coils, the transverse offset and the separation distance between coils. Sometimes the user sets the tolerance of the relatively larger transverse offset as the primary aim, but they never give up high efficiency. This paper theoretically analyzes the effects of the ratio between AC internal resistance...
The development of a dead-beat current controller with a disturbance estimator for grid-connected single phase (1ϕ) voltage source (VS) inverter is presented in this paper. The 1ϕ VS inverter is connected to the grid using L-type filter. Disturbance estimator is employed to reject any disturbances due to controller time delay, inductance mismatch, and/or grid voltage disturbances. The design and analysis...
With the advancements in power electronics technologies and the momentum towards intelligent electrical energy management, there is an increasing demand for power grids to have additional functions. Solid-state transformer (SST) is a new type of power converter that is employed in microgrids to achieve miniaturisation and promising performance. It comprises an isolated DC-DC converter with planar...
A mathematical model of series-parallel compensation topology for contactless power transfer system is proposed in this paper. The effect of harmonics is considered to model the system parameter. A fourier series analysis is used in mathematical modeling. An experimental set-up of series-parallel compensated contactless power transfer system is built in the laboratory to verify the proposed model...
This paper presents a method for modeling the variation of inductance by biasing the magnetic field in the core using an applied DC current. The technique uses the Jiles-Atherton model. Both low current and high current cases are modeled. For the high current application, an air-gap needs be introduced to avoid saturation. A controllable variable inductance model is built in Matlab/Simulink and is...
The Current-Source Flyback microinverter is widely used in ac-PV module applications, either in Discontinuous Conduction Mode (DCM), Continuous Conduction Mode (CCM) or Boundary Conduction Mode (BCM). The recently proposed hybrid DCM/BCM operation inherits the merits of both discrete conduction modes and improves the converter performance. In this work a power loss analysis of the hybrid operation...
A design for the inverter circuit configuration of integrated half-bridge modules with a focus on the circulating resonant current is clarified in this paper. Although this configuration has the advantages of small DC-side stray inductance, an analysis of the equivalent circuit suggests that a DC-side capacitor current increases depending on the relationship between the resonant and switching frequencies...
This paper researches on modeling and design of quasi-Z-source inverter (q-ZSI) applied for PMSM drive system. Using state-space average method, the small-signal model and steady model are builded. Based on the mathematical model of PMSM and q-ZSI, the control systems of dc-link voltage and stator current are designed. The bandwidth of dc-link system is limited to reduce the interference between them...
This paper proposes a novel on-line inductance identification method to account for inductance saturation in current controller design for single-phase grid-connected inverter with single inductor filter. The predictive control method with delay compensation is used which has wide bandwidth and reaches steady state within one switching period in current control loop. A multiple-sampling method is...
This paper describes a novel rotor position estimation method for IPMSM at low speed without any signal injection. The basic idea of proposed method is using derivative currents in zero vector state, because the derivative currents include the rotor position information. This paper presents the relationship between rotor position and current response at zero vector mathematically. By this relationship,...
This paper described a synchronized output regulation (SOR) strategy for control of inverters working in grid-connected and stand-alone modes. As a concept of networked dynamic systems, SOR means that the nodes have their outputs synchronized but also demonstrate the desired wave shape. Both the inverter and the utility are regarded as two nodes of the simplest network consisting of themselves. In...
The simulation of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Various simulations, varying the torque and current tolerances, are carried out in the low torque and high torque range. Simulation results show a direct influence...
The grid connected photovoltaic (PV) system have been modeled and simulated using control algorithm with dedicated PI control for dc link voltage regulation. Generally, the PI controller used for the system is tuned using trial and error method but this method is having manual limitation for the tuning of controller so as to obtain the desired response like as regulating dc link voltage to reference...
Series-series (SS) compensation is widely used in contactless power transfer (CPT) for electric vehicle because of their constant current and constant voltage charging features. In this paper, a mathematical model of SS compensation for CPT system is presented. This model includes the effects of harmonics on parameters of SS compensated CPT system. Fourier series analysis is used for mathematical...
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