A semi-two-stage common-ground-type transformerless dual-buck-based grid-connected inverter is proposed in this paper. The topology can eliminate common mode (CM) leakage current by connecting the negative terminal of photovoltaic(PV) directly to neutral point grid, which bypasses PV array's stray capacitance. guarantees increased robustness since dc-link cannot be short-circuited a shoot-through event. features multi-level characteristic, has lower forward-voltage drop and smaller dv/dt....

The hydro-mechanical behaviour and the constitutive model of sandy mudstone were investigated in this article. Two groups triaxial compression tests conducted. results indicated that inelastic deformation, damage, permeability failure affected by pore pressure confining pressure. was characterised coupled elastoplastic damage model. This based on effective stress principle numerical return mapping algorithms. Sensitivity analysis also performed to examine effects four key parameters...

Abstract Due to rapid degradation of the newly filled municipal solid waste (MSW), local temperature layer increases greatly. The mechanical parameters related and deformation high-density polyethylene (HDPE) pipes in body will be affected by elevated temperature. To predict distribution anaerobic landfill, a one-dimensional heat transfer model is established this study. This considers stratification saturated unsaturated zones, layering new old waste. Furthermore, single peak for production...

Abstract Average biodegradation rate of newly filled municipal solid waste (MSW) in landfills is relatively fast, and the landfill gas produced by new MSW can cause great variations pressure. To predict pressure distribution layer, a one-dimensional transport model established this study. The following factors are considered model: (1) variation permeability with depth; (2) anisotropy ratio permeability; (3) settlement caused biodegradation. Furthermore, single peak for production applied as...

The triaxial compression tests of multi-layered rock mass samples prepared from the laboratory were carried out by using servo-controlled rheological test system, and mechanical properties are studied. According to results, deformation characteristics failure modes analysed. relationship between layers parameters is discussed. results show that peak strength strain increases along with increase confining pressure. Failure forms include monoclinic shear failure, tension crack interfacial slip...

The mechanical behavior of basalt is critical to the stability and safety large structures erected on basalt. In this paper, a series tests (hydrostatic compression test, triaxial tests, cyclic loading test) are conducted specimens from Baihetan hydropower station in southwest China. test results show that crack closure (σcc), initiation (σci), damage (σcd) stresses approximately 39%–43%, 54%–68%, 74%–96% peak strength (σp), respectively. Based experimental results, coupled elastoplastic...

Columnar jointed rock masses (CJRMs) have a complex network structure and, therefore, present great challenge to geotechnical engineering design. A series of triaxial compression tests is performed on artificial CJRM specimens subjected confining pressure 5 MPa, considering various pore pressures (pw=0 2 and 4 MPa). In this work, the influence joint dip angles anisotropic strength, deformation, failure modes investigated. The characteristic stresses, strength parameters (c φ) elastic modulus...

High temperature may adversely affect municipal solid waste (MSW) biodegradation and lead to an increase in the deformation of high-density polyethylene (HDPE) pipes used for collection leachate landfill gas landfills. The test this study was change around vertical injection well by water using a well. conducted intermittently with two different flowrates newly filled MSW layer landfill. temperature, pressure level area were simultaneously monitored during study. results showed that...

An anisotropic rheological damage constitutive model for columnar jointed rock mass (CJRM) is proposed based on the microstructure tensor theory. Based variation of strain curve over time, relationship between and established by considering influence time effect deformation CJRM, aging variable introduced. The second development self-defined FlAC3D established, validity verified comparing experimental results with numerical results. Furthermore, developed applied to Baihetan engineering...

Heat and gas generation from the degradation of municipal solid waste affects landfill slope stability. Currently, differences between heat are understood, stability analyses considering these required. In this study, conducted laboratory field monitoring tests indicated that peaked earlier than generation. The relationship was then considered in a analysis. temperature peaked, lower safety factor minimum appeared. generally occurred when peaked. factors obtained with consideration...

The exploration of gas pressure and its distribution in landfills is a principal concern for the design management municipal solid waste (MSW) landfills. A one-dimensional analytical model was proposed to simulate vertical flow landfill with layered MSWs. transient solution obtained by method superposition eigenfunction expansion verified semi-analytical numerical simulation. According results parametric analysis solution, can be simplified quasi-steady-state flow. simulating MSW proposed....

Three phase semi-two-stage inverters have higher efficiency than that of the conventional two-stage three inverters, since part dc power can be fed to utility grid directly. However, these issue leakage current due high-frequency variation CMV (common mode voltage). To solve this problem, a modified SVPWM modulation strategy is proposed which reduce different degrees with input voltages. In addition, method has few influences on efficiency. Comparisons between and modulations are also...

Abstract Average biodegradation rate of newly filled municipal solid waste (MSW) in landfills is relatively fast, and the landfill gas produced by new MSW can cause great variations pressure. To predict pressure distribution layer, a one-dimensional transport model established this study. The following factors are considered model: (1) variation permeability with depth; (2) anisotropy ratio permeability; (3) settlement caused biodegradation. Furthermore, single peak for production applied as...