Along with the increasing penetration of photovoltaic (PV) power generation, regional forecasting becomes more and critical for stable economical operation system. The key challenge PV technology is lack complete accurate historical data since not all plants are equipped precise real-time output monitoring Besides, computation burden will be heavy when number in target region large. This paper therefore proposes an upscaling minute-level scheme using selected reference plants. In this paper,...

Globally, the installed capacity of photovoltaic (PV) power plants is undergoing rapid growth. However, random output fluctuation PV has brought great challenge to system stable operation. One most effective approaches counteract impact carry out forecasting under ultra-short-term scales, among which second-level technique still absent since pure historical data analysis plant cannot deal with sudden change induced by moving cloud and traditional image detection methods actually fail achieve...

This paper proposes a two-layer global synchronous pulsewidth modulation (GSPWM) method for attenuating the circulating leakage current of photovoltaic (PV) station with many inverters connected in parallel, and meanwhile allowing simple two-level string instead commonly used three-level to directly connect parallel without transformer isolation order save cost increase efficiency. The first-layer GSPWM could calculate optimal phase-shift angles triangular carriers among parallel-connected...

In principle, the location of global maximum power point (GMPP) partially shaded photovoltaic (PV) array highly correlates with shape <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$P - V$ </tex-math></inline-formula> curve, but such correlation is complex and hard to be specified using traditional mathematic expressions. This article, therefore, first explores nonlinear characteristics curve under partial...

After installation, the long-term efficient operation dominates profitability of photovoltaic (PV) generation systems. Unlike large-scale PV plants, distributed systems are relatively dispersed, and belong to different owners, whose main obstacle for maximizing profit is lack professional maintenance. This paper therefore proposes a cloud-edge collaborated dust deposition degree monitoring scheme without employing additional equipment, sensors or meteorological data, which just assumes...

In recent years, the installed capacity of renewable energy systems has seen rapid growth, particularly in photovoltaic (PV) power. Photovoltaic modules, being fundamental elements PV system, play a crucial role determining system performance. However, challenge arises from inconsistent decay rates which significantly impact accuracy modeling. To address this issue, paper introduces novel MIC-LSTM based parameter extraction method for single-diode model. This focuses on accurately deriving...

Modern power conversion systems (PCSs) have been evolving for over more than half a century by gradually enhancing their digital computing, communication, memory, and sensing functions. However, it is evident that state-of-the-art PCSs largely overlooked the enticing potential of fully exploring intelligent extensive interconnections among even with other heterogeneous devices. This oversight can be attributed to fact control in designed exclusively real-time due limited resources industry...

This letter proposes a closed-loop scheme for global synchronous pulsewidth modulated voltage source inverters with round perturbation and observation (R-P&O) algorithm to immunize the parameters uncertainty, e.g., line impedance filter variation. In specific, rms value of measured total current harmonics at point common coupling will be periodically sent each inverter as feedback signal using low-cost narrowband communication system. Then, assume R-P&O correct phase shift angles among...

Nowadays, one of the major challenges to developing high voltage direct current (HVDC) grid is effective and economical dc fault protection technique, which normally realized by circuit breakers (DCCBs). However, DCCB quite complex expensive. Therefore, explore an alternative solution, this article proposes a bipolar cascaded modular H7 source converter (CSC) for HVDC with simple ride-through capability then analyzes its behavior consequently scheme, can reduce design requirement DCCBs, even...

Design, fabrication and characterization of a novel two-color detector for ultraviolet infrared applications are reported. The has simple multilayer structure composed n-Al0.3Ga0.7N/i-GaN/p-GaN/SiO2/LaNiO3/PZT/Pt fabricated on sapphire substrate. Ultraviolet properties measured. For the region, flat band spectral response is achieved in 302–363 nm band. displays an unbiased responsivity 0.064 A/W at 355 nm. current-voltage curve shows that current zero bias −1.57 × 10−12 A. This led to...

This paper proposes a novel STATCOM by cascading packed U-cell (CPUC) and using low capacitance. Compared to cascaded H-bridge, the CPUC-STATCOM can largely reduce switch counts their related gate driver circuits. Then, skillfully utilizing principle that second-order harmonic component of capacitor voltage is in phase with absolute value grid capacitive mode, capacitance used CPUC-STATCOM. It cost, weight volume system compared usually large limit ripple within 10% nominal voltage. However,...

High-voltage photovoltaic (PV) techniques have their own advantages in PV plants for reducing the construction cost and improving operational efficiency. However, high input voltage increases mismatch losses of arrays, which is also a key factor that influences energy yield plants. This paper proposes three-input central capacitor (TICC) dc/dc converter high-voltage system, where four low-rating cascaded buck-boost converters connect to series-connected three low-voltage arrays two...

Modeling of PV system is essential to access its efficiency and performance under various operating conditions has great applicative prospect in MPPT power forecasting technique. Multiple parameters are involved describing the output characteristics cell non-convex nature optimization problem requires large amount computation identify those parameters. In this paper, a hybrid method presented, which employs analytical approach artificial neural network (ANN) extract single-diode module model...

Distributed static compensators (DSTATCOMs), composed of power converters and passive filters, have been extensively utilized in distribution systems to improve their quality. For the selection LCL filters with smaller sizes lower costs are increasingly being adopted replace conventional L filters. However, filter components normally designed for application grid-connected inverters, therefore, these can be further optimized when applied DSTATCOM, where grid-injected current is mainly...

Maximum power point tracking (MPPT) technique is essential in improving photoelectric conversion efficiency. The output characteristics curve of photovoltaic arrays under partial shading conditions (PSCs) contains multiple peaks, which requires a global peak value searching technique. Particle swam optimization (PSO) and its generalizations have been widely studied whereas they slow speed. Artificial intelligence techniques are also applied MPPT. However, when data size small, the accuracy...

High-power current source inverters (CSI) usually operate at a low switching frequency to reduce loss. To suppress low-order harmonics and simplify filter design, the selective harmonic elimination pulse width modulation (SHEPWM) technique is feasible common strategy in industrial applications. This paper proposes an operational that uses H7 inverter (H7-CSI) with hybrid switches perform SHEPWM technique. On basis of retaining conventional H6 bridge, commutation speed CSI improved by...

Due to the characteristics of intermittent, fluctuating and random, large-scale grid connected photovoltaic plants will seriously affect stability economic operation power system. Carrying out regional PV output forecasting could provide dispatching department with reference information output, which help make plan arrange standby capacity. Therefore, this paper proposed a method based on artificial neural network, is optimized by particle swam optimization algorithm. The accuracy verified...