In this paper, the structure and control method of microgrid in both islanded mode grid-connected are presented. And a seamless transfer strategy for droop controlled distributed generations from to is proposed. This based on consisted frequency synchronization phase synchronization. It could avoid oscillation, do not have an effect power sharing control. After synchronizations bypass switch closes at zero-crossing voltage, same time charges voltage sources current sources. Simulation...

ABSTRACT Rapid and accurate prediction of the sectional velocity field channel is great significance to design maintenance open channels improvement irrigation efficiency. During water delivery process Renmin Canal Dujiangyan system, level main canal changes rapidly in a large range, which biggest difficulty real‐time its field. Therefore, based on machine learning, this paper proposes new method construct model, can directly predict according level. According method, computational fluid...

Parallel operation of distributed generation is an important topic for microgrids, which can provide a highly reliable electric supply service and good power quality to end customers when the utility unavailable. However, there well-known limitation: sharing accuracy between generators in parallel operation. Frequency voltage droop well-established control method improving performance. In this method, active reactive calculations are used adjust frequency amplitude output voltage. This paper...

This article proposes a region-folding electromagnetic transient simulation approach for large-scale power electronics systems to boost speed. In the approach, loop tear method is proposed decouple connections among blocks, grouping and pre-calculating of identical structural blocks avoid computing inverse matrices repeatedly, global simultaneous response procedure handle multiple switching events. The implementation combined with high-performance parallelization technology shorten time....

Droop control method is the fundamental theory in wireless parallel operation. In droop method, output active power and reactive need to be calculated accurately for adjusting angular frequency amplitude of inverter voltage. So accuracy speed calculation very important performance Traditional methods single-phase have a slow oscillating transient response could easily impacted by disturbance variation load such as nonlinear light load. this paper, an optimized based on p-q proposed analyzed...

In this paper, circulating current in voltage-source mode parallel operation of distributed generation microgrid is modeled and analyzed. Then an improved droop control method, which combined the advantages communication, proposed order to improve power sharing performance eliminate operation. The method inherits simplicity, robustness expandability characteristic traditional methods, provides better voltage regulation elimination through taking advantage communication lines. Moreover, can...

In order to remove desired signal component from the sample covariance matrix, a novel robust adaptive beamformer is proposed based on matrix estimation. The direction first calculated first-order Taylor series approximation, and then signal's steering vector power are estimated by using iterative minimum variance beamforming, respectively. After above two processing, can be estimated. Furthermore, interference-plus-noise reconstructed subtracting matrix. Finally, simulation results...

The MMC based energy storage device is a type of bi-directional power device. Both the and are key infrastructures in future medium high voltage networks. converter enables capability embedding battery into sub-module distributively. employs as exchange interface An active control scheme for consists topology strategy. established on buck-boost circuit. strategy grid-connection method method. can buffer fluctuation applications renewable or transmission between AC grid DC grid.

LLC resonant converters have been widely used in DC/DC conversion because of their high efficiency. However, the are highly nonlinear, making it hard to use typical linear control methods. This paper proposes a disturbance-observer-based approach, which achieves better performance compared with conventional PI controller. First, according extended describing function (EDF) method, small-signal model phase-shift converter is established, further simplified third-order system. Then, presented,...

<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> resonant converters have drawn growing attention from industries. Time-domain analysis has the advantage of high accuracy, promoting utilization tanks. This article proposes a parameter optimization methodology for phase-shift based on fast-convergent time-domain algorithm. The algorithm can be extended to different operating modes, rather than confined specific mode. It minimizes number...

In this paper, an adaptive control strategy is presented for automotive HID lamps. Based on the lamps' model, a method of identifying cold and hot lamp mentioned. And then proposed warm-up current reference DC operation time are designed during stage based lamp's initial temperature. Compared with traditional method, could reduce loss electrodes extend life. Experimental results to show performance strategy.

This paper presents a multi-resolution approach for tumor motion modeling as function of respiratory the patient purpose conformal radiation therapy. Respiration induced can distort shape tumor, degrade anatomic position reproducibility during imaging, and necessitate larger margins therapy planning which may be harmful healthy tissue surrounding tumor. The key idea our is powerful averaging process allows one to blend independent arbitrary local models obtain global model without...

This letter proposes the multiarea hybrid equivalent (MAHE) circuit partition scheme, which decouples interconnected power electronics blocks of series, parallel, and both into smaller independent subcircuits, overcoming limitation low efficiency in intricate network blocks. The MAHE scheme segregates each partition's series parallel section apart from internal section, then turns impedance admittance. proposed is based on principles impedance's additivity Kirchhoff's voltage law...

Grid-forming (GFM) converters can support system voltage and frequency, which promotes the integration between distributed generations power grid. Due to time delay of digital control, virtual impedance exhibits opposite damping characteristics on both sides 1/6 sampling frequency ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">f_s</i> /6). The stable operation GFM be achieved by setting a reasonable feedback coefficient in each...

The direct current converters will be the key device for DC power distribution to achieve flexible control and active management of voltage between medium-voltage (MVDC) grid low micro-grid. This paper proposes a new strategy dual-active-bridge (DAB) with CLLC resonant tank. Compared traditional strategies, three modes operation are in bidirectional transmission control. Each mode provides an accurate modeling analysis process obtain small-signal model. Series balance parallel resonators...

A multiresolution approach is presented to study the uncertainty propagation problem in dynamic systems. The proposed an extension of generalized polynomial chaos and involves a separation random variables from deterministic ones solution algorithm for stochastic dierential equation. are expanded various local expansions which further blended together obtain global approximation state variables. These polynomials associated with assumed probability density functions input Galerkin projection...