- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
A High Performance Shade-Tolerant MPPT Based on Current-Mode Control
摘要： This paper proposes a high performance shade-tolerant maximum power point tracking (STMPPT) technique for DC-DC converter stage of photovoltaic (PV) applications. The average current-mode control (ACMC) is utilized to regulate the PV array current using two feedback control loops. The current-mode control is a superior scheme in control of DC-DC power electronic converters. The proposed STMPPT technique operates in two modes. The ACMC with the perturb and observe (P&O) MPPT algorithm functions in a local MPPT (LMPPT) mode under normal irradiance condition. When the PV array is likely to be partially shaded, a global MPPT (GMPPT) subroutine effectively scans the PV profile to optimize the PV system operation. This is achieved by implementing simple innovations to the ACMC-based P&O algorithm. The innovations benefit from useful observations of I-V characteristics. The idea behind using the I-V characteristics is to significantly reduce the search space, make the algorithm independent of shading conditions and PV array configuration, and inherently recognize the occurrence of partial shading conditions (PSCs). The proposed STMPPT technique enables very fast and reliable tracking of global maximum power point (GMPP). In addition, it can stably work under dynamic environmental change without losing correct sense of tracking direction. Its simplicity and independency would offer a viable solution for PV converter products. Simulation and experimental performance assessments are presented under different operating conditions that could happen in outdoor PV installations.
关键词： perturb and observe algorithm,partial shading condition,Photovoltaic system,current-mode control,shade-tolerant maximum power point tracking
更新于2025-09-19 17:15:36
-
Modern control scheme for Z-Source inverter based PV power generation systems
摘要： Z-source inverter (ZSI) based photovoltaic power conversion system (PV-PCS) provides both the DC link voltage boost and DC-AC inversion in single stage with added features. Traditional maximum power point tracking (MPPT) control algorithm generates the required shoot-through interval to output maximum power to the Z-network. At this instant, the voltage across Z-source capacitor is equal to the MPP voltage of PV array. The capacitor voltage cannot be further increased if it is demanded by the load. This paper presents an improved MPPT control algorithm along with modified MPPT algorithm to achieve both the MPPT as well as capacitor voltage control at the same time. Development and implementation of the proposed algorithm has been carried out by Matlab/Simulink software and the results are provided.
关键词： maximum power point tracking (MPPT),Z-source inverter (ZSI),capacitor voltage control (CVC),pulse width modulation (PWM),photovoltaic array (PVA)
更新于2025-09-19 17:15:36
-
[IEEE 2019 Innovations in Power and Advanced Computing Technologies (i-PACT) - Vellore, India (2019.3.22-2019.3.23)] 2019 Innovations in Power and Advanced Computing Technologies (i-PACT) - A Novel Switched Capacitor based High Gain Boost Converter with efficient MPPT controller for LED Lighting Applications
摘要： The paper proposed a novel switched capacitor based high gain quadratic DC-DC boost converter with Perturb & Observe MPPT (Maximum Power Point Tracking) controller. The converter configuration is appropriate to be employed in fuel cell and solar photovoltaic systems. The presented converter topology is designed with solar powered switched capacitor based voltage lift technique to provide high voltage conversion ratio. Due to variable atmospheric conditions it’s very difficult to provide constant output to the LED (Light Emitting Diode) load. Even small change in the characteristics of LED that will effect to damage the load. Hence P&O (Perturb & Observe) MPPT controller is applying for the designed converter configuration in order to produce stable output with high gain under variable weather conditions. Due to high step up gain and symmetrical configuration of the circuit topology, the stress voltage across the power semiconductor devices is low. Hence, the metal oxide semiconductor field-effect transistor gives high performance with low ON state resistance. The design cost of the circuit is reduces because of using low voltage rating diodes. Also reverse recovery and conduction losses are low which improves the power conversion and efficiency of the converter. The principle of operation and steady state analysis of the circuit topology are conferred in detail. Finally a simulation experiment of proposed converter with 120Watts of LED load is simulated and verified with theoretical analysis.
关键词： High voltage conversion ratio,Switched Capacitor,LED (Light Emitting Diode),PWM (Pulse Width Modulation) control,MPPT(Maximum Power Point Tracking),SMPS (Switched Mode Power Supplies),P&O (Perturb &Observe)
更新于2025-09-19 17:13:59
-
Frequency support from photovoltaic power plants using offline maximum power point tracking and variable droop control
摘要： With higher penetration of converter-connected renewable energy sources (RES) into power systems, the successful operation of the system is challenged by significant reductions in system inertia. Presently, given the dominant share of the conventional synchronous power plant, RES power plants are not demanded to provide ancillary services. However, as RES connections increase, RES power plants will play a major role in power system operation, contributing to frequency control. This study demonstrates that photovoltaic power plants (PVPPs) can provide effectively different types of frequency support based on a power reserve and an offline maximum power point tracking (MPPT) technique. An innovative method to de-load the PVPP without significantly increasing the MPPT complexity is proposed. Results from different PVPP frequency support methods, under varying levels of photovoltaic penetration, are presented which demonstrate their capability to provide inertia support comparable to that of synchronous generators. A new variable droop control method, which releases maximum power during the inertial response and returns to fixed droop gain value after a specified time is also presented. The results from using the variable droop show that the frequency nadir and the rate-of-change-of-frequency can be significantly reduced and some power reserve still maintained after a frequency event.
关键词： variable droop control,offline maximum power point tracking,photovoltaic power plants,system inertia,frequency support,renewable energy sources
更新于2025-09-19 17:13:59
-
Fixed frequency integral sliding-mode current-controlled MPPT boost converter for two-stage PV generation system
摘要： In two-stage grid-integrated photovoltaic (PV) system, usually a DC–DC converter is employed between the PV modules and the inverter. The dynamic interactions between the DC–DC converter, inverter, and the maximum power point tracking (MPPT) controller may affect the system performances. This study gives an integral procedure to design a stable sliding-mode controller (SMC) based on fixed frequency equivalent control approach to improve the transient response of PV system and to track the reference voltage supplied by the voltage-oriented MPPT controller in the presence of environmental and load perturbations and converter output sinusoidal perturbations imposed by the second harmonic of the grid frequency. The controller consists of fast current tracking inner current loop based on SMC law whose sliding surface is defined by the input capacitor and inductor current and outer PI controller maintains required PV voltage regulation. The superiority of the controller is validated at different operating conditions through PSIM software and its performance is compared with variable frequency hysteresis-based SMC. To check the static and transient performances of the system, various experiments are conducted. The results obtained show very fast transient response in settling time and alleviation of chattering magnitude at various operating conditions.
关键词： maximum power point tracking (MPPT),DC–DC converter,transient response,PSIM software,settling time,chattering magnitude,voltage regulation,photovoltaic (PV) system,fixed frequency,sliding-mode controller (SMC),hysteresis-based SMC
更新于2025-09-19 17:13:59
-
Critical Study of Several MPPT Techniques for Photovoltaic Systems
摘要： This paper presents a critical study of Maximum Power Point Tracking (MPPT) techniques for photovoltaic systems. After a brief introduction of the key factors for power extraction of photovoltaic panels, a review of commonly used MPPT techniques is presented and detailed with a holistic approach. Then, a comparison of these techniques is made according to several parameters such as robustness, response time, cost ... In the last part, the advantages and disadvantages of each of the MPPT techniques considered are presented. This article can serve as a quick guide to panel selection and MPPT technique for specific applications.
关键词： Boost Converter,Photovoltaic Generator,Maximum Power Point Tracking
更新于2025-09-19 17:13:59
-
[IEEE 2019 Innovations in Power and Advanced Computing Technologies (i-PACT) - Vellore, India (2019.3.22-2019.3.23)] 2019 Innovations in Power and Advanced Computing Technologies (i-PACT) - Single-Stage Multifunction Multilevel Converter for Grid Interactive Photovoltaic System using Cascaded Two-level Inverter
摘要： This paper presents a single-stage multilevel converter for grid interactive Photovoltaic (PV) system using a Cascaded Two-Level Inverter (CTLI). The converter uses less number of switches, less isolated DC sources and no extra components like capacitors and diodes which are used in conventional multilevel inverters (MLIs). The CTLI based grid tied Photovoltaic system tracks the maximum power produced by the PV array under varying insolation conditions and injects the active power into the grid. Additionally, the PV system is able to perform the reactive power compensation along with harmonics elimination for nonlinear load within the capacity of inverter. These multi-functionality increases overall utilization of the system. The control scheme of the CTLI based grid interactive PV system is developed using instantaneous power (p-q) theory. The control of CTLI based multifunctional grid interactive PV system is verified through MATLAB/Simulink simulations. The simulation results validate the performance of CTLI based grid tied PV system for MPPT as well as active and reactive power control for changing insolation and load conditions.
关键词： Cascaded Two-Level Inverter (CTLI),Maximum Power Point Tracking (MPPT),Photovoltaic (PV),Multilevel Inverter (MLI)
更新于2025-09-19 17:13:59
-
Wireless Sliding MPPT Control of Photovoltaic Systems in Distributed Generation Systems
摘要： The aim of a photovoltaic (PV) system’s control is the extraction of the maximum power even if the irradiance, the temperature, or the parameters vary. To do that, a maximum power point tracking (MPPT) algorithm is required. In this work, a sliding control is designed to regulate the PV modules’ output voltage and make the panel work at the maximum power voltage. This control is selected to improve the robustness, the transient dynamic response, and the time response of the system under changeable environmental conditions, adjusting the duty cycle of the DC/DC converter. The DC/DC converter connected to the PV module output is a buck-boost converter. This configuration presents the advantage of providing voltages lower or higher than supplied by the photovoltaic modules to provide the required voltage to the load (including the voltages ceded by telecommunication loads, amongst others). In addition, a remote sliding control is developed to make the global supervision of the PV system in distributed generation grids. The designed algorithm is tested in an experimental platform, both locally and remotely connected to the base station, to prove the effectiveness of the sliding control. Thus, the communication effect in the control is also analyzed.
关键词： maximum power point tracking (MPPT),sliding mode control,photovoltaic system,wireless communication
更新于2025-09-19 17:13:59
-
Reduction of electrical power loss in a photovoltaic chain in conditions of partial shading
摘要： The paper presents the problem of losses of electrical power in photovoltaic chains during partial shading. Photovoltaic modules work best when the illumination is uniform over the entire light-sensitive surface. If a part of this surface is illuminated to a lesser extent, it often ceases to be a part of the electricity generator, but constitutes a resistance. To minimize this phenomenon, PV modules use bypass diodes, e.g. covering several dozen cells in a photovoltaic chain. In addition, parts of the photovoltaic module surface with lower exposure to sunlight may be additionally illuminated with a mirror positioned to reflect light. The analysis uses a photovoltaic chain model implemented in MATLAB/Simulink. The model describes the processes of electrical power generation in photovoltaic modules. The model corresponds to a laboratory photovoltaic system located in AGH in Cracow. In the presented model, each individual part may be illuminated with different light intensity. The light incident on the cells is a direct sunlight or light reflected from the mirror. The model allows for the analysis of the electrical power generated depending on the light profile of the photovoltaic system. The results of the model analysis may be applied in optimization of the PV modules’ configuration.
关键词： Partial shading,Modelling,Photovoltaic system,Sunlight reflection,Maximum power point tracking (MPPT)
更新于2025-09-19 17:13:59
-
[IEEE 2019 IEEE 8th International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP) - Le gosier, Guadeloupe (2019.12.15-2019.12.18)] 2019 IEEE 8th International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP) - Hyperspectral Super-Resolution: A Coupled Nonnegative Block-Term Tensor Decomposition Approach
摘要： This paper proposes a grid-tied photovoltaic (PV) system consisting of modular current-fed dual-active-bridge (CF-DAB) dc–dc converter with cascaded multilevel inverter. The proposed converter allows a small dc-link capacitor in the three-phase wye-connected PV system; therefore, the system reliability can be improved by replacing electrolytic capacitors with ?lm capacitors. The low-frequency ripple-free maximum power point tracking (MPPT) is also realized in the proposed converter. First of all, to minimize the in?uence resulting from reduced capacitance, a dc-link voltage synchronizing control is developed. Then, a detailed design of power mitigation control based on CF-DAB dynamic model is presented to prevent the large low-frequency voltage variation propagating from the dc-link to PV side. Finally, a novel variable step-size MPPT algorithm is proposed to ensure not only high MPPT ef?ciency, but also fast maximum power extraction under rapid irradiation change. A downscaled 5-kW PV converter module with a small dc-link capacitor was built in the laboratory with the proposed control and MPPT algorithm, and experimental results are given to validate the converter performance.
关键词： Current-fed dual-active-bridge (CF-DAB),low-frequency ripple,maximum power point tracking (MPPT),small dc-link capacitor,high-frequency link (HFL)
更新于2025-09-19 17:13:59