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The Ironless Axial Flux Permanent Magnet (IAFPM) machine, also referred to as air-cored or coreless machine is a variant of the AFPM machine with the iron removed from the stator. This allows the efficiency and power density of the machine to be further improved [1]-[4]. However, IAFPM motors generally have very low inductance (< 50μH) due to their ironless nature [5], which increases the design...
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...
This paper introduces a design methodology of the zero-voltage switching (ZVS) inverter. Winding structure of the resonant inductor is investigated with finite element analysis (FEA) tool. Busbar structure of the ZVS inverter is discussed to obtain lower stray inductance of the crucial loop. A 30-kW prototype was built following proposed design methodology. The experimental results show that the highest...
This paper presents a new approach that provides scaling the LCL-filter inductances based on the harmonic analysis of the filter output current. The approach considers the filter design together with the inverter control, both together, improving the system stability and the dynamic response. The model and general guidelines for selecting the filter parameters, taking into account the variation of...
Due to the increasing energy demand there is a need of energy storage and advanced power conversion system. Energy which are available from the renewable energy sources can be efficiently store and can be convert to feed load as per the requirement. There are some power quality issues or poor voltage regulation where the load is supplied by renewable energy source. Therefore it is required to design...
This paper presents the basics, design and analysis of LCL filters for connection with the grid. Different topologies of filter are discussed along with their drawbacks. Various passive damping techniques for LCL filter are presented and analyzed by plotting the frequency response curves. Large rating, bulky size of LC filter acts as a disadvantage and thus was tried to be compensated by LCL filter...
This paper proposes strategies for regulating the grid current of a three-phase inverter connected to an electrical network through a LCL filter interfaced by a PV system. The focus of the analysis is to investigate the use of a PI controller or PR controller to regulate the grid current in the outer loop, when there is inner capacitor current regulating loop already provided in order to stabilise...
The design criteria of PV cell, DC/DC converter and grid connected DC/AC inverter which belong to the photovoltaic system are determined and Simulink models are established in this study. The control of DC/DC converter and DC/AC inverter is ensured by using fuzzy logic and PI control. The results of fuzzy logic and PI control were compared. It was seen in the result of simulation that fuzzy logic...
The disc coreless permanent magnet synchronous motor (DCPMSM) is drived by an inverter with current source chopper. A fast global terminal sliding mode control (FGTSMC) method is proposed in this paper for the torque loop, and the instantaneous torque is predicted. The proposed control system can dramatically reduce the current ripple of the DCPMSM by low inductance. The feasibility of this proposed...
This paper introduces the mathematical model of a double boost circuit for the condition that the short circuit to ground happens to one phase of inverters, taking into account the impact of leakage inductance of power transformers. The corresponding energy transmission modes are analyzed, mainly focusing on the reason why the rectifier diode reverses voltage and the DC bus voltage rises. Then a novel...
This paper proposes a Discontinuous current mode (DCM) feedback current control for the grid-connected inverter in order to achieve the low THD of the grid current at wide load range. In the DCM operation, the nonlinearity between the duty ratio and the current occurs in the current command response, whereas another nonlinearity between the disturbance voltage and the current occurs in the disturbance...
The quasi-Z-source inverter (qZSI) features as the shoot-through capability and the ability to buck and boost voltage with a single-stage structure. However, the protection mechanism for the shoot-through current (STC) is essential because of the increased current stress on the switching devices. This paper presents a STC sensing method for the protection based on the combined currents. Both the STC...
Magnetically-coupled resonant wireless power transfer (MCR-WPT) offers a novel technique to transfer power over a long distance with high efficiency. A half bridge inverter with series-resonant structure is designed as driver source for WPT system in this paper. The frequency is up to 0.9MHz, which is very higher than traditional power electronic converter. The relationship between output power, transmission...
Dynamic wireless power transfer is a practical method to solve electric vehicle range anxiety and reduce the cost of on-board batteries. However, the power cannot be transferred between different coupler structures. In this paper, DDQ coupler is adopted in primary side for delivering power to any secondary coupler. A novel multiple legs inverter topology and reflected load identification method is...
This paper proposes a new virtual impedance method for parallel inverters. To achieve wireless control, the droop control method is adopted, and virtual output impedance is usually added to alleviate the unbalance of output impedance between each inverter and then, improve power sharing accuracy. However, resistive virtual impedance usually causes a certain voltage drop, while inductive virtual impedance...
As aviation power supply is developing to be increasingly integrated, by sharing the same main circuit, AC and DC dual output can be achieved through the same power supply to greatly improve power integration and power density. However, transformation ratio and transformer leakage in AC conversion can cause voltage drop in DC output and thus fail to meet the rated voltage of aviation DC power. To...
This paper presents the control of grid connected wind driven permanent magnet synchronous generator through solid state transformer with a high frequency multistage converter interconnect. Maximum power point tracking is carried out in the high frequency generator side converter stage where as the grid side converter takes care of the synchronization. The model parameters for the high frequency transformer...
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 the design and implementation of a high frequency magnetic resonant coupling wireless power transfer (WPT) for middle power charging applications. The size and efficiency of resonator are depending on the resonant coupling frequency in the WPT system with magnetic resonant coupling. To improve the WPT efficiency, power capacity and resonator size, a high resonant coupling frequency...
This paper presents a scalable synchronous buck converter design. Innovation lies with the design method and control algorithms. Firmware makes the converter's half-bridges switch as to emulate a resistively terminated ladder network. This actively damps filter resonances and prevents circulating currents when multiple converters operate in parallel.
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