- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Framework of Gradient Descent Least Squares Regression Based NN Structure for Power Quality Improvement in PV Integrated Low-Voltage Weak Grid System
摘要： This work proposes a novel gradient descent least squares regression (GDLSR) based neural network (NN) structure for control of grid-integrated solar PV (Photovoltaic) system with improved power quality. Here, a single layer neuron structure is used for the extraction of fundamental component (FC) from the load current. During FC extraction, GDLSR based NN structure attenuates harmonic components, noise, DC offsets, bias, notches and distortions from the nonlinear current, which improves the power quality under normal as well as under abnormal grid conditions. This single layer GDLSR-based NN structure has a very simple architecture, which decreases the computational burden and algorithm complexity. Therefore, it is easy in implementation. In this work, the GDLSR based control technique is tested on a single-phase single-stage grid-integrated PV topology with the nonlinear loads. The prime objective of the GDLSR based NN structure is to provide reactive power compensation, power factor correction, harmonics filtering and mitigation of other power quality issues. Moreover, when solar irradiation is zero, then the DC link capacitor and VSC, act as a distribution static compensator (DSTATCOM), which enhances the utilization factor of the system. The proposed system is modelled, and its performances are verified experimentally on a developed prototype in different grid disturbances as well as solar insolation variation conditions, which performances have satisfied the motive of proposed technique as well as the IEEE-519 standard.
关键词： Single-phase Grid,GDLSR based Control,Grid Integration,Single-stage Topology,Solar Energy,Power Quality,DSTATCOM
更新于2025-09-23 15:22:29
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Optical orbital angular momentum under strong scintillation
摘要： The evolution of classical optical fields propagating through atmospheric turbulence is investigated under arbitrary conditions. We use the single-phase screen (SPS) method and the infinitesimal propagation equation (IPE), a multiphase screen (MPS) method, to compute the optical power fractions retained in an input Laguerre-Gauss (LG) mode or transferred to higher-order LG modes. Although they show the same trend while the scintillation is weak, the IPE and SPS predictions deviate when the strength of scintillation passes a certain threshold. These predictions are compared with numerical simulations of optical fields propagating through turbulence. The simulations are performed using an MPS model, based on the Kolmogorov theory of turbulence, for different turbulence conditions to allow comparison in both weak and strong scintillation. The numerical results agree well with the IPE results in all conditions, but they deviate from the SPS results for strong scintillation.
关键词： multiphase screen method,scintillation,infinitesimal propagation equation,atmospheric turbulence,Laguerre-Gauss modes,single-phase screen method,optical orbital angular momentum
更新于2025-09-23 15:22:29
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[IEEE 2018 International Conference on Control, Power, Communication and Computing Technologies (ICCPCCT) - Kannur,Kerala, India (2018.3.23-2018.3.24)] 2018 International Conference on Control, Power, Communication and Computing Technologies (ICCPCCT) - A Brief Study of Solar Home Inverters
摘要： In every field of human development, electricity usage is increasing promptly. Utilization of solar energy is a way to meet the energy demand. The solar inverter is one such device, which makes the solar energy to usable form. In this paper, three major inverters are presented. The voltage source and current source inverters, stand-alone and grid-connected inverters and, square, modified square and sine wave inverters come under the classification. An open loop strategy is considered for the MATLAB Simulation of the three main types of PWM inverters available in the market. A brief description of PV array, charge controller and battery is also presented in this paper.
关键词： Solar Inverter,SPWM,PWM,Off-Grid inverters,Single phase inverters,Power Inverters
更新于2025-09-23 15:22:29
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LCO-FLL control for single-phase utility integrated single-stage solar PV system
摘要： This study presents a limit cycle oscillator-frequency locked loop (LCO-FLL) control for single-phase utility integrated single-stage photovoltaic (PV) system. The proposed topology increases the utility of the voltage-source converter (VSC), particularly in the absence of PV generation. It has the potential to load harmonics current mitigation. It estimates harmonic free load current accurately with low computational requirement due to the absence of cumbersome mathematical algorithm and transformation techniques. It provides reactive power compensation, both in the absence and the presence of PV generation, improves transient response during dynamics in load and varying irradiance conditions. The total harmonic distortions of utility current and utility voltage, compliance the limit of the IEEE-519 standard. The proportional–integral (PI) regulator regulates the DC-link voltage of VSC input to the reference DC-link voltage. The incremental conductance-based technique derives the reference DC-link voltage. The dynamic behaviour of the LCO-FLL-based control is improved using a feed-forward loop for the PV power sharing. It also reduces loading on the PI controller. Test results demonstrate satisfactory performance of LCO-FLL-based control.
关键词： single-stage solar PV system,LCO-FLL control,proportional–integral (PI) regulator,incremental conductance-based technique,feed-forward loop,reactive power compensation,voltage-source converter (VSC),IEEE-519 standard,single-phase utility
更新于2025-09-23 15:21:21
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[IEEE 2020 11th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC) - Tehran, Iran (2020.2.4-2020.2.6)] 2020 11th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC) - Utilization of Soft-Switched Boost Converter for MPPT Application in Photovoltaic Single-Phase Grid-Connected Inverter
摘要： A modified soft-switched boost converter with a lower number of auxiliary components is proposed in this paper that provides either zero-voltage-transition (ZVT) or zero-current-transition (ZCT) operation for main switch and diode. Proposed converter is utilized in a single-phase grid-tied photovoltaic power generation system. Due to importance of maximum power harvesting from PV, incremental conductance MPPT procedure is employed to control DC/DC converter. Simulation is performed in PLECS software to validate the advantageous introduced soft-switching technique.
关键词： Zero-Voltage-Transition (ZVT),Zero-Current-Transition (ZCT),Single-Phase Grid-Connected Inverter,Incremental Conductance MPPT,Soft Switching Boost Converter
更新于2025-09-23 15:21:01
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[IEEE 2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE) - Cochin, India (2020.1.2-2020.1.4)] 2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE2020) - Power Optimized Architecture based Converter and Its Control for Single Phase Grid-Tied Solar Photovoltaic System
摘要： This paper proposes a power optimized based converter and its control for low voltage solar photovoltaic (PV) modules. For the grid tied solar PV system, the dc-bus voltage must be maintained more than a minimum level for its satisfactory working. In optimized architecture, each PV module is connected with a non isolated high gain DC-DC converter. These converters boost up the PV voltage as well as harvest the maximum solar energy. In the case of shadow, aging and fast change in solar insolation profile on each PV modules; it is able to harvest the maximum power. For maximum power harvesting, fuzzy logic control (FLC) is used. Each PV module with high gain DC-DC converter is connected at the common DC link. The DC power is converted into AC power by using voltage source Inverter (VSI). The VSC is controlled to stabilize dc-link voltage, synchronize with grid supply and to achieve low total harmonic distortion (THDs) in grid current under feeding non linear loads. For switching of a VSC, hysteresis control is used. Proposed model is developed using MATLAB 2015a and results are obtained under various operating conditions.
关键词： single phase grid,voltage source inverter (VSI),DC-DC converter,photovoltaic (PV) system,point of common coupling (PCC),high gain,maximum power harvesting (MPH)
更新于2025-09-23 15:21:01
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Common Mode Voltage Reduction of Single-Phase Quasi-Z-Source Inverter Based Photovoltaic System
摘要： A common mode voltage (CMV) reduction method is proposed for the active power filter (APF) integrated single-phase quasi-Z-source inverter (qZSI) based photovoltaic (PV) power system. The APF integrated qZSI completely compensates the dc-side double-line-frequency (2ω) ripple through the APF capacitor, while maintaining low qZS inductance and capacitance. The proposed method reduces the CMV amplitude to half of that using the traditional sinusoidal pulse width modulation (SPWM). The switching and conduction power losses are analyzed. Simulation and experimental results demonstrate the proposed method reduces CMV without comprising performance and efficiency of the APF integrated single-phase qZSI.
关键词： single-phase inverter,quasi-Z-source inverter,pulsewidth modulation,Common mode voltage
更新于2025-09-23 15:19:57
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Developing highly crystalline, single-phase and copper-poor Cu2ZnSnSe4 nanoparticles for solar cell application
摘要： In this study, we report the synthesis of Cu(Zn,Sn)Se2 (CZTSe) nanoparticles by hot-injection method for application to the absorber layer in solar cells. The composition of elements in the CZTSe nanoparticles depends mainly on the injection speed of the Se precursor. By controlling the injection speed, we obtained complete single-phase CZTSe nanoparticles with high crystallinity and copper-poor composition. The nanoparticle diameter mainly ranged from ~ 7 nm to 18 nm. The obtained CZTSe nanoparticles were used to fabricate a light absorber layer in the CZTSe solar cells. The cell exhibited performance, with short-circuit current density of ~ 30.8 mA/cm2, open-circuit voltage of 0.39 V, ?ll factor of 0.47 and conversion ef?ciency of 5.8%.
关键词： Hot-injection method,Single phase,CZTSe nanoparticles,Copper-poor composition
更新于2025-09-23 15:19:57
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Performance analysis of the Single-Phase Grid-Connected Inverter of a photovoltaic system in water and wind applications
摘要： Single-phase grid connected inverters are nowadays broadly developed and tested in various types of applications especially in photovoltaic systems. The main aim of the inverter control strategy is to extract the maximum energy from the PV system which corresponds to the maximum power at certain conditions. However, the MPPT methods are also important in other renewable energy conversion systems. This paper analyses the performance of a commercially available photovoltaic inverter in water and wind systems. Presented models are implemented in a laboratory test bench in the form of torque characteristics realised by an induction motor fed by the inverter with vector control. The parameters are scaled into relative variables to provide a proper performance comparison. Presented tests include step response to assess the performance of a system dynamic. The dynamic tests showed a fast response of the investigated systems. The MPPT tracking accuracy tested under realistic profiles is similar for both cases: 98% and 96% respectively for the wind and water systems. These results prove the satisfactory performance of the MPPT of the PV microinverter in these applications.
关键词： Single-phase grid-connected inverter,wind turbine,water turbine,MPPT,photovoltaic system
更新于2025-09-23 15:19:57
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[IEEE 2018 4th IEEE International Conference on Emerging Electronics (ICEE) - Bengaluru, India (2018.12.17-2018.12.19)] 2018 4th IEEE International Conference on Emerging Electronics (ICEE) - Simulation Based Analysis of Grain Boundary in IBC Perovskite Solar Cells
摘要： The active power filter (APF) that consists of a half-bridge leg and an ac capacitor is integrated in the single-phase quasi-Z-source inverter (qZSI) in this paper to avoid the second harmonic power flowing into the dc side. The capacitor of APF buffers the second harmonic power of the load, and the ac capacitor allows highly pulsating ac voltage, so that the capacitances of both dc and ac sides can be small. A model predictive direct power control (DPC) is further proposed to achieve the purpose of this new topology through predicting the capacitor voltage of APF at each sampling period and ensuring the APF power to track the second harmonic power of single-phase qZSI. Simulation and experimental results verify the model predictive DPC for the APF-integrated single-phase qZSI.
关键词： Active power decoupling,second harmonic power,single-phase system,quasi-Z-source inverter,direct power control
更新于2025-09-23 15:19:57