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This paper presents a proportional harmonic power sharing (PHPS) control scheme to improve the voltage quality at point of common coupling (PCC) and share harmonic power simultaneously for an islanded microgrid. The proposed control strategy employs P+ multiple resonant controller, and P+ plus Q+-based improved droop control scheme to improve the voltage quality at the load bus. Additionally, the...
With the increasing amount and type of connected microgrids in the near-term future power networks, how to optimize the operation of a multi-microgrid system efficiently and reliably has become essential for taking full advantage of the complex systems. In this paper, we propose a multi-timescale coordinated optimization strategy for hybrid three-phase/single-phase multi-microgrids. With the consideration...
To manage the microgrid effectively, it is important to get the power information among multiple distributed generation (DG) units. However, when the droop control method is adopted, as the corresponding DG units cannot be simply modeled as VF or PQ buses, the conventional power flow algorithm may become inapplicable. To solve this issue, a time domain iteration (TDI) based power flow algorithm is...
The optimal planning of distributed photovoltaic system is conducive to reducing the adverse impact of high-permeability random access on power distribution systems. In this paper, a optimization planning model of locating and sizing of distributed photovoltaic power generation system is established to improve the permeability of PV system on the premise of the safe operation of the power system,...
Semantic technologies (based upon domain ontologies) have been widely adopted in various biological, biomedical, and clinical research areas. Consequently, semantics-oriented data science and computational life sciences have increasingly attracted scientists' attention. In our previous efforts, we have developed a semantic data integration and search software tool named OmniSearch [1], which was specifically...
For an islanded microgrid, load power should be properly shared among multiple distributed generation (DG) units, not only for the fundamental power but also for the harmonic power. In this paper, the operation of microgrids under imbalanced and nonlinear load conditions is studied, and a dynamic consensus based power controller is proposed for DG units to realize enhanced power sharing performance...
Based on cellular automata model, the impact of information suggestion on the traffic flow of a three-route system has been studied. In the model, we assume that a speed limit bottleneck exists on one route. When vehicles drive past this bottleneck, their speed will be reduced to 0. By simulation, it was found that a big traffic jam appears before this bottleneck. To alleviate this kind of traffic...
For hybrid three-phase/single-phase multi-microgrids, a tie-line power optimization strategy based on Stackelberg game considering three-phase unbalance is proposed. In this paper, a topology of hybrid three-phase/single-phase multi-microgrids and the three-phase unbalance constraint are firstly introduced; then the tie-line power optimization strategy based on a one-leader-multi-follower cooperative...
To improve wildfire responses by making and implementing safe, effective and efficient management decision, predictive services has been created to better preparing and responding to wildfires. Recently, efforts had been made to strengthen the capabilities on collecting and integrating timely weather information for improving the predictive services products. Previously, the weather information source...
Most of the disabled spacecraft are spun, which are dangerous to other normal work spacecraft. Therefore, the disabled spacecraft need to be cleared and the first step is de-tumbling its angular velocity to an acceptable value. This paper investigates the dynamics and controller design of electromagnetic de-tumbling, analyzes the effects of the Earth's magnetic field, the inclination and the orbit...
In order to solve the problems of privacy protection and the user revokes in social network, a multi-authority attribute-based encryption access control for social network is presented. In the proposed scheme, we utilizes the linear secret sharing scheme and the proxy re-encryption technique to achieve the user rights update and support flexible access control strategy. Multiple authorities jointly...
This study provides a new concept of dual clutch transmission (DCT) system, which using one-way clutches and synchronizers compose a multi-speed mechanism. In this paper, the gear shifting processes of a general DCT system are discussed, and the mathematic equations and dynamic models of the conventional DCT system and new DCT system are established. Through a series of dynamic simulation analyses,...
In this paper, a novel two-phase orthogonal frequency division multiplexing-index modulation (OFDM-IM)-aided cooperative relaying protocol is proposed for overlay cognitive radio (CR) networks, where the primary and secondary networks work concurrently over the same spectrum band. In the proposed scheme, OFDM-IM technique is used at the secondary user (SU) to split the transmission space into the...
Orthogonal frequency division multiplexing with index modulation (OFDM-IM) is a newly proposed technique, which achieves significantly improved performance in comparison with classical OFDM by using the indices of active subcarriers to carry additional information bits. In this paper, we propose two power allocation (PA) algorithms for the sake of further improving the bit error rate (BER) performance...
Differential spatial modulation (DSM) is a novel attractive alternative technique for coherent spatial modulation (CSM) without channel state information (CSI) at the receiver. In this paper, iterative detection is firstly employed to improve the performance of DSM schemes. With the Hamming distance of two matrices reduced to the sum of simple elements, a lowcomplexity iterative detection scheme for...
Self-calibration methods of underwater light attenuation using a multispectral imaging system are important for subsea detection. However, the accuracy of calibration is strongly related to the characteristics of color filters used in imaging systems. This paper presents the influence of filters on attenuation calibration. The principle of a self-calibration method is introduced with the origin of...
Laser ranging in a water medium is always challenging owing to the attenuation and scattering of the laser. This paper presents a correction method for laser ranging based on a laser ranging experiment in different turbidities of water. First, this paper examines the influence of water on the dynamic range and accuracy of laser ranging. Then, the effects of attenuation and scattering are eliminated...
This article is mainly focused on a method for stabilizing the position of an incident laser beam position by using a closed-loop fast steering mirror system. According to the input and output data, a model for the fast steering mirror system is established, which is utilized for the closed-loop controller. In the experiment, the spot centroid position, which is obtained by means of a position sensitive...
This paper investigates the detailed operating principles of V2 controlled buck converter operating in pseudo-continuous conduction mode (PCCM), based on which the discrete time model is established to explore its stability. Furthermore, introducing the internal and external ramp compensation, operation regions of the converter under different internal compensation coefficient, external compensation...
With the assessment of single-phase microgrids (MGs), three-phase/single-phase (TP/SP) hybrid multi-microgrids (MMGs) are emerging, provided with more complex architecture. This paper deals with the black-start problem for TP/SP MMGs in islanded mode caused by an unscheduled breakdown from the main grid. The three-phase units, such as energy storage systems (ESSs), photovoltaic (PV) systems, and loads,...
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