This paper presents a switching bi-directional buck-boost converter (SBBBC) for vehicles-to-grid (V2G) system. The topology can provide an energy flow path exchange between the Li-battery/supercapacitor (SC) hybrid storage system (HESS) of electric vehicle and grid. not only has capability, but also function management. In this paper, state-space averaging method is used to analyze stability in boost buck modes. control strategy given according state charge (SOC) ensure that output voltage...

To enhance the accuracy of comprehensive evaluation reservoir quality in shale oil fractured horizontal wells, Pearson correlation analysis method was employed to study correlations between geological parameters and their relationship with production. Through principal component analysis, original factors were linearly combined into components clear specific physical meanings, aiming eliminate among factors. Furthermore, Gaussian membership functions applied delineate fuzzy levels, entropy...

The conductivity of propped fractures following hydraulic fracturing is crucial in determining the success process. Understanding primary factors affecting fracture and uncovering their impact patterns are essential for guiding selection engineering parameters. We conducted experiments to test analyzed effects proppant particle size, closure pressure, surface properties on conductivity. Using orthogonal experimental method, we clarified secondary relationships influencing results indicate...

Due to the popularity of plug-in electric vehicles (PEV)and development converter technology, electric-drive-reconstructed onboard converter(EDROC)is widely used in charging system which can work vehicle grid(V2G) mode or grid vehicle(G2V) mode. In this article, an EDROC for V2G/G2V energy management is proposed. The uses permanent magnet synchronous motor as a inductor without additional equipment. Meanwhile, article proposes hierarchical and corresponding control strategy with proposed...

Summary This paper presents a new topology of the input current continuous switch boost inverter (ICCSBI) and perturbation observation with hysteresis comparator method. Because traditional needs to join dead time avoid short circuit, will cause distortion output current. And is not suitable for photovoltaic power generation because it buck converter. The ICCSBI structure improves booster which refers Z‐source inverter. It can get higher voltage than Meanwhile, only retains advantages but...

The placement of proppant within fractures is critical to the effectiveness hydraulic fracturing. To elucidate migration and patterns multi-branched during fracturing, we conducted simulation experiments under both single-fracture multi-branched-fracture conditions, varying injection rates sizes. results research indicate that increasing rate effectively increases magnitude vortex formation at leading edge sandbars drag forces acting on particles, resulting in increased particle distances....

This paper presents a novel fuzzy logic controller (FLC) for indirect vector control induction motor (IM) drive. The speed is used in the loop. 4 kW three-phase squirrel cage IM fed by current controlled voltage source inverter (CCVSI). complete scheme of drive implemented real time using TMS320LF2812 digital signal processor. simulation and experiments are carried out proposed system. model system developed MATLAB environment to analyze performances experimental results verify that FLC can...

In this paper, an Electric-drive-reconstructed onboard converter (EDROC) based on a switching network in the DC side is proposed. The system can utilize existing hardware of electric vehicles and does not need extra equipment. When EDROC connects to power grid through outlet at office or home, there any additional equipment (filter relay) AC side. Compare with traditional EDROC, proposed novel has advantages cost volume. realize unity factor charging mode discharges drive motor driving mode....

Grid impedance variation and voltage harmonics may cause instability of the grid-connected inverter system reduce grid current quality under weak grid. Switching losses electromagnetic interference can be reduced by using lower switching frequency. However, it is a challenging task to achieve stable operation LCL-type active damping method at low In this paper, an improved control strategy proposed for dual-frequency inverter, which contains power auxiliary converter. For strategy, ability...

This paper presents a non-isolated three-port switching boost converter and applies it to photovoltaic systems. The topology combines the characteristics of network. By controlling three degrees freedom, ports have boost, buck, buck-boost characteristics. It expands (TPC) working range with advantages simple structure, small size, low cost. operating mode power flow direction TPC are determined according state charge (SOC) energy storage system. Analyses in different modes further verify...

This article uses the maximum power model to analyze principles of point tracking (MPPT) in photovoltaic (PV) system, this principle is applied specific high-gain Boost circuit and control circuit, through a algorithm change duty cycle realizes tracking, are formed by CPLD AVR microcontroller, which generate varying 40 KHz PWM pulse circuit. Algorithm incremental conductance method, presents direct method changing cycle. Experiments show that effect good.

A wind turbine simulator (WTS) for energy conversion systems has been developed with a view to design, evaluate, and test of actual (WT) drive trains including generators, transmissions, power-electronic converters controllers. The consists 11.5-kW permanent magnet synchronous motor (PMSM) which drives generator real-time control software. In this simulator, DSP, PC interfaced LAB Windows I/O board, an are used instead real supply shaft torque. torque characteristic use 6th order polynomial...

Shale oil is mainly extracted by fracturing. However, it difficult to determine the optimum construction parameters obtain maximum productivity. In this paper, a fuzzy comprehensive production evaluation model for fractured shale horizontal wells based on random forest algorithm and coordinated principal component analysis proposed. The fracturing of target are optimized combining with an orthogonal experimental design. was used calculate importance data sample factors. main controlling...

In vector control system of PMSM, the change temperature and electrical current in different operating conditions would cause variation machine parameters. This will lead to loop PI parameters actual do not match, as a result performance have serious decline. To solve this problem, Recursive Least Squares method with forgetting factor is used obtain real-time then can be got by some calculations. Experimental results show that effectively adapt changes working quickly achieve precise...

This paper presents a control strategy for rectifier with variable speed direct driven permanent magnet synchronous generator. In order to achieve maximum power point tracking (MPPT) wind generation systems, the rotating of turbines should be adjusted in real time according speeds. The fuzzy logic controller is used track generator varying optimize turbine aerodynamic efficiency outer loop. voltage space vector PWM field-oriented adopted side converter. By means control, highest can reached....

To increase the efficiency of grid-connected inverter, this study proposes an L + LCL-filtered dual-frequency single-phase inverter. The proposed inverter consists low-frequency unit and high-frequency unit. transmits power to grid at low switching frequency. uses feed-forward method eliminate current ripples without harmonics detection. passive damping LCL filter is used attenuate harmonics. operation principle analysed, parameter design introduced. An experimental prototype built test...

UAV technology has been widely used in the field of surveying and mapping, but mostly fixed wing. The equipment is expensive operation complicated. Operator needs systematically training .The flight height high ground resolution limited. In recent years, with consumption unmanned aerial vehicles market become hot, a large number small were applied to construction, power, agriculture other fields. This paper mainly uses PHANTOM 4 PRO obtain test area image data. It analyzes application...

A novel parallel dual-frequency single-phase grid-connected inverter (PDF inverter) is proposed to improve the quality of output current and reduce loss inverter. In PDF inverter, there are two units which operate at different switching frequencies. The low-frequency unit has a low frequency (2kHz), transfers electrical energy grid. high-frequency high (40 kHz), its reversed harmonic power unit. principle control strategy presented. And comparison inverters shows that higher efficiency than...

Using a low pulse ratio, the electromagnetic interference and switching loss of an inverter can be effectively reduced, particularly in high-power applications. However, due to variations grid impedance, it is challenging task achieve stable operation LCL-type grid-connected (GCI) using active damping method with ratio. Thus, novel three-phase dual-frequency GCI presented ensure symmetry output power system address stability issues. The proposed topology this article composed two inverters...

Summary To simplify the inverter topology and suppress leakage current more effectively, a novel transformerless dual‐frequency grid‐connected with common direct (DC) bus is proposed. The proposed retains advantages of traditional such as high efficiency absence resonance. In topology, power unit adopts highly efficient reliable concept (HERIC) unipolar modulation strategy, auxiliary H‐bridge bipolar strategy. It verified that circulating between two units can be eliminated in inverter....

In order to suppress leakage current and improve the efficiency of transformer-free grid-connected inverter, a novel topology control method is proposed. The proposed inverter consists power unit an auxiliary converter unit, two units are connected by capacitor on dc side. transmits grid at low switching frequency for reducing losses. operates high frequency, adopts feedforward eliminate ripples. voltage parasitic capacitance between photovoltaic array ground stabilized with bipolar...

This paper presents a novel fuzzy logic controller (FLC) for three-phase PWM Rectifier.The is employed in the outer voltage loop. In order to improve performances of current loop, antiwindup PI inner used instead traditional controller. The complete control scheme Rectifier implemented real time using TMS320LF2812 digital signal processor. simulation and experiment are carried out proposed system. FLC-based rectifier investigated. results show that FLC can not only enhance robustness system,...