Based on the boost full bridge isolated converter (BFBIC) topology and considering sudden changes in external environment, a global maximum power point tracking (GMPPT) control strategy based an improved gray wolf optimizer (IGWO) algorithm is proposed this paper. In strategy, nonlinear tangent trigonometric function as convergence factor integrated into (GWO) algorithm. addition, active-clamp circuit phase-shift are used to implement soft switch technology for BFBIC photovoltage (PV)...

As the output power of photovoltaic (PV) array changes with change external environment and load, maximum point tracking (MPPT) technology is needed to bring efficiency PV device into full play. In this paper, chaos search theory first applied on MPPT system; algorithm based dual carrier increases adequacy overcomes blindness traditional search, thus improves solves problem multiple MPP under partially shadowing conditions. Comparative tests show that proposed method can track step response...

Phase compensated proportional resonant (PR) controllers with phase leading angles embedded into controllers, are used to improve the system stability, when grid-connected inverter is connected a weak grid large impedance. However, an inappropriate angle will cause obvious anti-peak in magnitude response of PR controller. Thus, should be selected carefully. The conventional compensation (CPC) method for selecting can maximize margin, but at expense peaks sensitivity transfer function....

To diagnose open-circuit faults (OCFs) in sub-module switching devices within input-independent output-series (IIOS) photovoltaic DC collection systems, this paper presents a hybrid diagnostic method combining convolutional neural networks (CNNs) and long short-term memory (LSTMs). The utilizes sliding window technique to segment capacitor voltage signals into time-series samples. Initially, CNN automatically extracts local features from the samples, followed by LSTM for capturing temporal...

Studies suggest that inter-area low-frequency oscillations can be damped with supplementary damping control of large-scale photovoltaic (PV) plants. Multiple-model adaptive (MMAC) is applied as the strategy to deal uncertain variations postdisturbance operating conditions. To reduce scales model bank and damper bank, K-means clustering algorithm used taking modes features for condition clustering, a common designed each cluster. Based on deviation between output dynamic responses actual...

Long-distance power transmission makes a large-scale centralized photovoltaic (PV) plant (CPPP) integrated into weak grid with low short circuit ratio. Under this condition, small fluctuations in PV are likely to cause significant system-wide voltage. To overcome problem, novel CPPP Volt-Var control (VVC) strategy is proposed. Unlike the conventional VVC achieved manner, realization of proposed mainly based on decentralized communication. The framework for has two tiers. In upper-tier...

The alternating direction method of multipliers (ADMM) has been extensively investigated in the past decades for solving separable convex optimization problems, and surprisingly, it also performs efficiently nonconvex programs.In this paper, we propose a symmetric ADMM based on acceleration techniques family potentially nonsmooth programming problems with equality constraints, where dual variables are updated twice different stepsizes.Under proper assumptions instead socalled...

Grid impedance brought in by transformers and transmission lines large-scale photovoltaic (LSPV) system results complex interactions between the plant grid. An equivalent model of LSPV containing polytype inverters is established. Influences different types grid on grid-connected current stability are studied root locus analysis. The increase both every kind will degrade stability. problem voltage at point common coupling (PCC) investigated through phasor diagram. It found that PCC not exist...

Dynamic analysis of micro-grid provide important guidance for the control strategy design energy balance and frequency stability. This paper mainly analyzes dynamic characteristics micro sources under fault or normal circumstances with different structure methods, bring up problems in present analysis, discuss development micro-grid.

In order to achieve high-efficient grid-connected control of photovoltaic generation system, in this paper the hysteresis current has been introduced z-source inverter for control. Combining both these advantages, method based on constant-frequency is proposed. Due particularity shoot-through operating state inverter, boosting characteristic vector and performance voltage are analyzed. According logical analysis, inserted This technology not only preserves advantages quick dynamic response,...

In order to study the relationship between low-temperature performance of cold-patching asphalt mixtures and fractal gradation, 13 groups SMA-13 gradations were designed, then test was carried out. The overall dimension D, coarse aggregate Dc, fine Df obtained by using theory, according correlation analysis dimension, prediction model based on established.

Series–parallel module technology can meet a DC converter’s requirements of high-power, large-capacity, and high step-up ratio in photovoltaic boost collection system. However, the cascaded structure has problem voltage current sharing between modules, due to duty cycle limitation converters, combined converters PV-converter unit have an unbalanced voltage, which may also exceed range under partial shading conditions (PSCs). First, aiming at problems sharing, low modularity converter, this...

Large-scale photovoltaic (PV) plants may be destabilised by the large grid impedance introduced transformers and long transmission lines. When considering digital control delay of grid-connected inverters, problem will become more serious. In this study, equivalent model digitally controlled large-scale PV is established, that values parameters LCL filter follow Gaussian distributions. Then, system stability can analysed conveniently, analysis shows make robust to worse. To enhance...

A new type of differential game guidance law is proposed for the scenario launching two defensive vehicles to intercept an attack vehicle in this article. First, according engagement scene, relative motion equations (<tex>$A$</tex>), 1, 2 (<tex>$D_{1}, D_{2}$</tex>), and target (<tex>$T$</tex>) are established linearized around collision triangle based on assumptions. Secondly, corresponding cost functions given pursuit-evasion problem transformed into linear quadratic problem. Finally,...

As an interface form of DC boosting and collection system PV power plants, the input-independent output-series (IIOS) connected modular dc-dc converter is suitable for distributed PV, which has advantage high voltage gain independent maximum point tracking (MPPT) control. However, problem mismatch may cause IIOS run in unstable state. This paper proposed a equalization circuit(PEC) Distributed to solve problem. Compared with existing topology, number switching devices reduced. By adding...