Renewable energy and storage technologies are expected to promote the goal of net zero-energy buildings. This article presents a new sustainable solution using photovoltaic-driven liquid air (PV-LAES) for achieving combined cooling, heating power (CCHP) supply. Liquid is used store generate smooth supply-load fluctuations, residual heat from hot oil in LAES system cooling supplements. Taking an actual building as research object, dynamic PV-LAES model built optimize power/cooling/heating...

The waste heat recovery technology of data center has attracted the attentions for energy conservation and emission reduction in recent years. This paper presents a new scheme which uses to link agricultural sector. detailed system design, technical validation, environmental economic analysis show that project can fully absorb large amount center, use air source pump (ASHP) transport an ecological farm, reducing consumption electric promoting development agriculture animal husbandry. In case...

In this paper, a Y-Δ hybrid connection for high-voltage induction motor is described. Low winding harmonic content achieved by careful consideration of the interaction between Y- and Δ-connected three-phase sets so that magnetomotive force (MMF) in air gap close to sinusoid. Essentially, two operate six-phase mode. This paper goes on verify fundamental distribution coefficient stator MMF enhanced compared standard set. The design method converting conventional double-layer lap into described...

This paper investigates the damping performance of a grid-connected photovoltaic (PV) system with inductance-capacitor-inductance (LCL) filter and develops hybrid strategies which is more robust to parameter variations, processing delay switching frequencies. Firstly, comprehensive model including LCL filter, inverter grid are developed. Then passive active under different impedances, controller gains investigated. Finally, method combing both conditions proposed. The new can reduce impact...

In DC micro grids and networks, DC-DC power converters having a large number of semiconductor-based electronic devices are usually adopted to interconnect the renewable sources flexible loads. Most suffer from poor fault withstanding abilities, but conventional protection schemes have bottlenecks time-delay, self-malfunction mis-judgement. This paper presents novel solution using superconducting current limiter (SFCL) protect device extend usage grid. SFCL is actually self-triggering,...

In renewable energy generations, LCL filters are commonly used to connect in series with the output ports of converter smooth currents flowing into grid due their enhanced attenuation ability and smaller inductance compared single L filters. However, inherent resonance an filter makes control such a system challenging, different passive active damping strategies have been developed till now. This paper aims problems proposes new approach realize damping. Based on traditional virtual...

To enhance the dynamic low-voltage ride-through (LVRT) performance of a doubly fed induction generator (DFIG) based wind turbine during postfault stage, novel LVRT scheme is proposed by integrating stator-side superconducting fault current limiter (SSFCL) with two-step rotor-side series resistor (RSDR). The basic principle, circuit modeling, and switching strategy SSFCL RSDR are presented to form primary backup protection schemes. As compared conventional SSFCL-based scheme, results obtained...

The bistable behaviors of deployable composite shell structures are experimentally studied. First, carbon/epoxy and glass/epoxy thin-walled fabricated using resin transfer mould technology, respectively. Second, the structure investigated including process, bending moment, flexural radius. Finally, critical conditions discussed. results show that directly related with material type, properties lay-ups.

The fast-response feature from a superconducting magnetic energy storage (SMES) device is favored for suppressing instantaneous voltage and power fluctuations, while the low-cost conventional battery (BES) suits to achieve long-time compensations in distribution utilization systems. This paper investigates new dc swell compensating scheme by using an SMES-BES-based hybrid technology. In preliminary tests, iron-core copper coil used imitate high-temperature inductor, this SMES emulator is,...

The rapid charging/discharging feature from a superconducting magnetic energy storage (SMES) unit suits to smooth the transient voltage and power fluctuations, while zero-resistance effect cable (SC) is favored for achieving highly efficient delivery with nearly zero loss in most of energy-intensive data centers. This paper investigates novel low-voltage direct-current (LVDC) distribution scheme by using combined technology employing both SMES SC devices. Preliminary simulations demonstrate...

Voltage transient disturbance is one of the key voltage quality disturbances, which can be classified into oscillatory and impulsive transient. Currently, there no simple, accurate general method to detect, extract, characterize disturbance. This paper proposes a time-domain detection based on RMS (root mean square) values segmented differential waveforms. Firstly, abnormal waveforms are detected extracted, will used for further analysis. Secondly, extracted waveform data pre-processed, then...

The large-scale cascade hydropower plants in southwestern China now challenge a multi-market environment the new round of electricity market reform. They not only have to supply load for local provincial market, but also need deliver central and eastern centers external markets, which makes generation scheduling much more complicated, with correlated uncertain environment. Considering uncertainty prices correlation between multiple this paper has proposed novel optimization model long-term...

Damage-induced helium leakages in flexible composites are experimentally studied this article. First, both surface and inner damage were produced the composites. Helium leakage with different patterns based on measurement of differential pressure. Second, influence pattern parameters was investigated. Finally, damage-induced mechanism given. The results show that is main source

This paper focuses on the modeling and analysis of basic composition, characteristic interactions with grid for megawatt (MW)-level large scale grid-connected photovoltaic (PV) plants. For a MW-level PV plant, numbers inverters relatively smaller capacity are employed to operated in parallel. When irradiance area array is not equal, output power verses voltage will have several peak values affect maximal tracking. LCL filters adopted filtering harmonics generated by inverters, but due its...

Building energy consumption is the main urban component, which mainly serves people-centered work and living demands. Based on physical requirements of humans in buildings to determine comfortable body temperature each season, this paper establishes a sizing optimization model building-type integrated systems (IES) for sustainable development, where cooling heating loads required maintain indoor somatosensory comfort are calculated. Depending external price, internal power balance, other...

In this article, the mechanics analyses on helium leakage of flexible composites are theoretically studied. First, physical model permeation for subcomponents composites, including protected layer, load carrier, and barrier, established based microscopic scale, respectively. Second, influences in-plane loading conditions three different structure layers in analyzed. Finally, overall permeant rates estimated results reveal that barrier capability mainly depends properties layer.

An experimental study has been conducted to investigate characteristics of upward forward smoldering combustion an unretarded polyurethane foam in a forced oxidizer flow. Experiments are done small-scale, vertically oriented cylindrical apparatus. The is through the igniter which contact with bottom surface certain volume flow rate. A constant power applied until temperature at 30 mm reached 300 °C make can propagate itself interior without aid igniter. histories measured by 14 type-K...

With the advantage of integrating distributed energy, storage and DC load with high efficiency, distribution network recently attracted wide attention in field nearly zero energy buildings. Considering large number buildings enormous energy-saving potential, form revenue are key factors affecting efficiency operational economy. Aiming at characteristics AC topologies buildings, an evaluation method is proposed based on time-sequential power flow simulation, where piecewise linear function...

For urban electrical and thermal energy supply consumption terminals, the multi-energy system is a way to realize conversion efficiently, cleanly economically. To further study power flow character of systems, additional factors such as electric-thermal coupling equipment, rules should be taken into consideration. The traditional Newton-Raphson iteration method which has been commonly used for calculation must expanded mixed flow. This paper realized new expression hot water temperature drop...

On the basis of analyzing composition losses in high-efficient high-voltage asynchronous motors, approaches increasing efficiency motors is investigated this paper. The concern with improvement material, winding, fan, magnetic groove and so on. By taking economy into account synthetically, design YKK series induction carried on, it realized by software simulation.

With increased current density induced by crowding in Through-silicon Via(TSV), the reliability problem of interconnection 3-D IC power grid, especially electromigration (EM), cannot be ignored. To ensure EM limit is not exceed and delivery network stable, it essential to accurately analyze effect TSV before manufacturing. So this paper, a two dimensional analytical method for DC interconnection, which includes bump, proposed based on Laplace equation firstly. Then, validated simulation...