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This paper investigates the problem of accurate active power sharing in virtual flux droop where flux angle droop control is used for DG controllers instead of traditional frequency droop control. Firstly, the virtual flux droop control method is introduced. Then, the reasons for inaccurate active power sharing in flux angle droop are analysed. Further, to solve this problem, an active power compensation...
This paper proposes a novel reactive power control strategy based on virtual flux droop method. Firstly, flux droop control method is derived, where comlicated multiple feedback loops and parameter regulation are avoided. Next, the factors influencing reactive power sharing are theoretically analysed in virtual flux control. Then, a novel reactive power droop controller is designed which consists...
This paper presents an investigation of influence of different winding configurations and stator teeth width on permanent-magnet (PM) machines with similar slot and pole numbers. The results show that the machine with alternative teeth wound has higher output torque and stronger fault tolerant capability by finite element analysis. Unequal stator teeth width and teeth top width are applied to improve...
A hybrid genetic algorithm (HGA) is proposed to optimize the rotor shape of an Interior permanent magnet machine which is used in EV application. The novel method obtain lower iron loss and torque ripple as well as higher average torque and efficiency for the machine. The optimization results of the HGA design is compared with the initial and genetic algorithm designs. It is shown that the performance...
In this paper, considering the change rate of the load, a frequency division control is optimized to improve the control accuracy of hybrid energy storage, compared to the traditional frequency division control. Firstly, the optimal control strategy is designed based on the first power allocation and the second power allocation. Secondly, the model is applied in residential area to avoid the peak...
In virtual flux droop method, power sharing is achieved by adjusting flux amplitude and angle which has some advantages of simplicity of control and lower voltage and frequency deviation. In this paper, a switch module of power calculation was firstly designed to balance system dynamic response and power fluctuation in flux droop controller. Then an improved direct flux controller was proposed to...
Poor local search capability is a defect of genetic algorithms (GA), which make the GA easily trapped in a local extremum during the later evolution stages. However, as a local optimization method, the Taguchi method has strong local optimizing ability, which could overcome this shortcoming of GA. Therefore, in this paper, a hybrid genetic algorithm (HGA) which combines the GA with the Taguchi method...
This paper presents an Comparative investigation of three 12-slot/14-pole surface-mounted permanent-magnet (SPM) machines with different winding configurations by finite element analysis (FEA). Three winding distributions for machines are investigated. For the first two situations, machines have equal teeth width, with one having all teeth wound and the other having alternative teeth wound. For the...
This paper proposed a modified control strategy of rotor-side converter (RSC) to suppress the rotor over current and electromagnetic torque oscillations. Simulation results validate the effectiveness of the modified control strategy.
This paper presents detailed analysis of the DFIG-based wind energy conversion system(WECS) under three-phase voltage dips conditions via a coupled simulation. 1.5MW DFIG is modeled in Ansoft-Maxwell, and the simulation is coupled with Ansoft-Simplorer and Matlab-Simulink for drive circuit and controller implementation. The coupled simulation system including DFIG, RSC, GSC, DC-Link, step up transformer,...
This paper presents a detailed analysis of the dynamic behavior of Doubly Fed Induction Generator (DFIG) under asymmetrical voltage dips. Finite element analysis (FEA)for 1.5MW DFIG, back-to-back converter, DC-Link, step up transformer, voltage sag generator(VSG) and the control algorithm have been considered and coupled together by using a coupled simulation. The effect of asymmetrical voltage dips...
Power generation and grid stability have become key issues in the last decade. The high penetration of large capacity wind generation into the electric power grid has led to serious concerns about their influence on the dynamic behavior of power systems. The Low-Voltage Ride-Through (LVRT) capability of wind turbines during grid faults is one of the core requirements to ensure stability in the power...
As the contribution of wind energy to the power grid increases, serious concern about its influence on the dynamic behavior of the power system has also increased. This has raised the need for advanced analysis and simulation tools that can study the complicated dynamic behavior of wind turbines, test their controllers as well as emulate a complex power grid. Therefore, to meet all the aforementioned...
The low voltage ride through(LVRT) requirements are usually defined by the grid codes at the point of common coupling(PCC). The voltage dip types experienced at the doubly-fed induction generator(DFIG) terminals are different from the conditions at the PCC due to the characteristics and limitations of the network. This paper first analyzes the fault characteristics experienced at the terminal of the...
The effective control of permanent magnet synchronous generator(PMSG) based wind energy conversion systems(WECS) under unbalanced grid voltages is important to improve the grid-connected operation ability. This paper applies the proportion integral plus reduced order resonant integrator(PI-ROGI) controller to the PMSG grid-side converter, which can achieve zero current error control in the positive...
The cogging torque of permanent magnet synchronous generator (PMSG) is a main part of the starting resistance moment(SRM) for wind turbine, it is serious large at the very low wind speed. A novel method of minimizing the cogging torque by shifting permanent magnet pole is proposed based on different slotpole combination for PMSG. Different FEA models are set up to validate the proposed method and...
This paper presents a comparison between fractional-slot concentrated-winding (FSCW) and integer-slot distributed-winding (ISDW), and analyzes the performance of the permanent magnet generator with FSCW. Meanwhile, the demagnetization phenomenon under short-circuit faults is analyzed and gives a guideline for optimal design of generators so that the irreversible demagnetization can be avoided with...
This paper presents a detailed calculation of the characteristics of five different topologies of permanent magnet (PM) machines for high performance traction including hybrid electric vehicles using the Finite Element Analysis (FEA) method. These machines include V-shape single layer interior PM, W-shape single-layer interior PM, Segment interior PM and Surface PM on the rotor with distributed winding...
This paper presents an optimization of an interior permanent magnet (PM) machine with fractional-slot concentrated windings (FSCW) based on a machine with integer-slot distributed windings (ISDW), and a performance comparison between the two machines for use in hybrid electric vehicles. Finite element analysis (FEA) is used to investigate the characteristics of the two machines which have the same...
This paper presents a novel control strategy of three-phase, boost-type and, three-Wire, single-phase AC/DC Power Converters AC/DC power converters. The proposed control algorithm is based on Sliding Mode Control methodology. The basic idea is to apply a feedback implementation of pulse-width modulation (PWM). The method exhibits low sensitivity to disturbances and fast dynamic performance in addition...
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