The strong coupling between electric power and heat supply highly restricts the generation range of combined (CHP) units during heating seasons. This makes system operational flexibility very low, which leads to heavy wind curtailment, especially in region with a high percentage CHP abundant energy such as northeastern China. storage capacity pipelines buildings district (DHS), already exist urban infrastructures, can be exploited realize decoupling without any additional investment. We...

To solve frequency stability problems caused by the high-power loss of ultra-high voltage faults and high penetration levels renewable energy, a method active response (AFR) based on model predictive control (MPC) for bulk power system is proposed. On basis time-space distribution characteristics in system, framework AFR built, which transformed from decentralized feedback to centralized feedforward control, theoretical coordination optimization multiple regulation means provided. By using...

This paper proposes a ferro-nickel (Fe-Ni)/PZT H-type fork magnetoelectric (ME) composite structure and an energy management circuit for ME harvesting. The resonant with high <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> value shows higher voltage coefficient stronger power compared the conventional rectangular structure. can obtain output of 61.64 μW at ac magnetic field 0.2 Oe. sensitivity reaches 11 V/Oe. For weak magnetic-field...

Soil salinization poses a threat to maize production worldwide. The genetic mechanism of salt tolerance in is not well understood. Therefore, identification the components underlying importance. In current study, teosinte-maize BC2F7 population was used investigate basis 21 tolerance-related traits. total, 125 QTLs were detected by using high-density bin map, with 1 5 explaining 6.05-32.02% phenotypic variation for each trait. total explained (PVE) all ranged from 6.84 63.88% Of QTLs, only...

To avoid straightforward volumetric discretization, a discontinuous Galerkin time-domain (DGTD) method integrated with the impedance boundary condition (IBC) is presented in this paper to analyze scattering from objects finite conductivity. Two situations are considered. 1) The skin depth smaller than thickness of conductive volume. 2) larger thin sheet. For first situation, surface (SIBC) employed, wherein usually exhibits complex relation frequency. incorporate SIBC into DGTD, approximated...

Abstract In order to improve the safety of 2,4,6,8,10,12‐hexanitro‐2,4,6,8,10,12‐hexaazaisowurtzitane (CL‐20) while preserving its high energy yield, a nanocomposite containing CL‐20 and 1,3,5‐triamino‐2,4,6‐trinitrobenzene (TATB) with particular structure is prepared using an facile fast antisolvent crystallization method. Using this approach, which takes advantage strong temperature effects, lamellar arrangement created consisting nanosheets TATB, further coated dendritic nanometer‐scale...

Abstract Background Maize ( Zea mays ssp. ) is the most abundantly cultivated and highly valued food commodity in world. Oil from maize kernels nutritious important for diet health of humans, it can be used as a source bioenergy. A better understanding genetic basis kernel oil help improve content quality when applied breeding. Results In this study, KUI3/SC55 recombinant inbred line (RIL) population, consisting 180 individuals was constructed cross between lines KUI3 SC55. We phenotyped 19...

The megnetoelectric (ME) effect of magnetostrictive Terfenol-D (Tb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> xmlns:xlink="http://www.w3.org/1999/xlink">-</sub> xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> Dy Fe xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> xmlns:xlink="http://www.w3.org/1999/xlink">y</sub> ) and piezoelectric Pb(Zr,Ti)O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> plates bonded on a beryllium...

Scavenging electromagnetic and vibration energy from environments is an attractive technique for powering wireless sensors in a sensor network. This paper reports our design testing results on the electric output performance of piezoelectric harvesting device, which consists cantilever beams, magnetoelectric (ME) transducers, permanent magnets. The geometric parameters device are based optimization with targeted resonant frequency 50 Hz. Experimental show that voltage 56.1 V average power...

Hovering performance of unmanned helicopter is key importance in flight.This paper presents an autonomous control system to achieve the excellent hovering for a miniature helicopter. First, response data collected during special flight test and linear time-invariant model extracted by frequency identification technique.Then, designed implemented on hover using multi-loop method.The method has simple structure, straightforward design process low com-puting load imposed system. The proposed...

The location and capacity of a distributed power plant largely affects the flow entire grid, which also whether losses in grid are within reasonable limits. distribution problem generation is an optimization problem. In this paper, we first determine line loss by improved algorithm, then gray wolf algorithm for purpose minimizing voltage deviation network. has advantages fast convergence strong globalization. We conducted experiments using IEEE33 bus standard radial From tested results, it...

A brand-new magnetostrictive/piezoelectric laminated composite is presented using the giant magnetostrictive Terfenol-D, piezoelectric PZT and high-permeability FeCuNbSiB. Since FeCuNbSiB changes effective magnetic field in Terfenol-D deformed applies a stress to an external field, thus saturation coefficient of enhanced, resulting higher magnetoelectric voltage output for composite. Based on equivalent charge theory, effect analyzed, theoretical formula low-frequency are derived based...

Active frequency response (AFR) control is needed in current power systems. To solve the over-frequency problems of generators connected to non-disturbed buses during AFR period, should be clustered into coherent groups. Thus, efficiency can improved on premise ensuring accuracy. Since influencing factors (such as model parameters, operation modes, and disturbance locations, etc.) system comprehensively reflected by generator frequency, which easily collected calculated, used coherency...

This paper introduces a new principle and real structure of no-scanning, fast response, arbitrarily distributed tactile sensor array using piezoelectric resonator their applications as force/pressure, temperature biochemical array. The has very high mechanical quality factor stability, the quasidigital output can be measured easily end precisely. sensory method in is specific position according to time difference arrival wave at transducers on Because softness film, film adaptive sensitive...

A FeCuNbSiB/FeNi/PZT laminated composite is developed and comparatively studied with a FeNi/PZT composite. The influence of high-permeability FeCuNbSiB alloy on applied DC magnetic field, piezomagnetic coefficient optimal bias field FeNi investigated. experimental results show that compared in the two-phase FeNi/PZT, three-phase composite, (i) decreases from 200Oe to 55Oe, maximum magnetoelectric(ME) voltage increases 1.59V/Oe 2.77V/Oe; (ii) under small ME by factor 1.7—7.8; (iii)...

This study studies how impulses affect the bounded behaviours of delay system with disturbance. By employing method Lyapunov function, several criteria finite‐gain stability from disturbance to output are established. It is shown that a linear differential can be stabilised using impulsive feedback control even there an unstable matrix. Moreover, equations also maybe stable under appropriate sequence treated as disturbances. Two examples and simulations given illustrate our results.

A Helmholtz resonator can harvest the weak acoustic energy, but traditional management circuits hardly efficiently obtain energy due to diode drop of rectifier. high-efficiency circuit for is developed, and conjugate impedance matching piezoelectric transducer storage inductance are realized. The proposed has 59% 94% higher charging voltages than double synchronized switch harvesting series switching with inductor circuits. drive wireless sensors at a pressure 0.2 Pa be used in other harvesters.

The precise load shedding of source-grid-load friendly interaction system can realize accurate control the interruptible on user side when UHV DC fault occurs through classified management load. Compared with traditional way integral power cut-off, it greatly reduce social impact caused by faults. This paper analyzes requirements system, establishes classification model based discusses selection algorithm, and proposes a method for margin optimization basic (BLS) algorithm. simulation...

Recently, more and accidents show that the SVGs are effective devices to provide reactive power prevent splitting of wind farms from main grid. This paper analyses impact SVG on voltage stability an actual farm. First, structure characteristic is introduced. Then, control strategy presented. Furthermore, simulation model for farm containing built in DIgSILENT/PowerFactory. The results can improve under different operation conditions.

On the basis of 320×240 cooled staring focal plane array(FPA) detector,a compact mid-wavelength infrared zoom system with six lenses is designed,The consist a mechanically compensate system,a re-imaging system,and two reflectors,can realize 27.5～458 mm continuous and satisfy 100% cold shield efficiency.The design results prove that has high optical transmission,large ratio,high resolution,small size excellent image quality.

The equivalent circuit with complex physical constants for a piezoelectric ceramic in thickness mode is established. In the circuit, electric components (equivalent parameters) are connected to real and imaginary parts of coefficients materials. Based on definitions dissipation factors, three them (dielectric, elastic factors) represented by parameters. Since parameters detectable, factors can be easily obtained. experiments, temperature stress responses measured.