- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Robust maximum power point tracking of photovoltaic generators based on real-time dynamic conductance estimation
摘要： In this paper, an innovative approach aimed to robustify maximum power point tracking, intended for managing a photovoltaic generator is presented. The method exploits the bond between photovoltaic generator static and dynamic conductance, utilizing their sum as the base controller management mutable data of the maximum power point tracking loop. Environmental condition and operating point are the significant variables that influence dynamic and static conductance values, consequently, when using a controller which design to a single nominal operation point a nominal response is un-achievable, thus, system response can vary from overdamped to underdamped. Notwithstanding, dynamic and static conductance sum calculation always yield zero when the photovoltaic generator operates at the maximum power point. Therefore, forcing the sum to zero drives the system to be at maximum power point no matter the states of the environmental conditions. Uneven and variable response time calls for implementing a disturbance observer as a counteraction to the nonlinear maximum power point tracking loop regulation variables, operation point, and environmental condition variations. Test results of implanting disturbance observer revealing a unified and nominal response all over the operation range, therefore the proposed approach enhanced and robustified the common integral controller.
关键词： Maximum power point tracking,Renewable energy generators,Dynamic conductance,Robust control
更新于2025-09-12 10:27:22
-
A New Approach to Suppress DC-link Voltage Oscillations for a Grid Connected Photovoltaic System
摘要： A ?xed size perturbation in a Maximum Power Point Tracking (MPPT) algorithm yields excessive oscillations of operating point around the MPP and thus causes ?uctuations in the dc link voltage and ?ickers in the injected grid current. In this paper, we propose a new adaptive P&O MPPT by employing a Proportion-Integral (PI) controller to generate variable perturbations which eliminates the steady state error and yields faster settling time in the MPP tracking response. A comparative analysis is made using simulations in MATLAB/ Simulink ?rst then experimental studies on a prototype of grid connected PV system (GCPVS) is pursued. The obtained results are analyzed and it is found that the adaptive MPPT e?ectively reduces the dc-link voltage oscillations and injected grid current ?ickering.
关键词： Adaptive Perturb & Observe,Photovoltaic System,Maximum Power Point Tracking,Grid Integration
更新于2025-09-12 10:27:22
-
[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Multilevel-Boost-Converter-Neutral-Point-Clamped-Inverter Photovoltaic System with MPPT Based on Fibonacci Search
摘要： This paper deals with a system composed by a photovoltaic array feeding a Neutral-Point-Clamped inverter by a dc-dc multilevel boost converter. The system is able to adequately operate under partial shading condition. A current control allows for the boost converter to operate at high frequency while the Maximum Power Point Tracking (MPPT) with the help of Fibonacci search. System operation is explained as well as its model, control and PWM strategy. Simulation and experimental results validate the theoretical studies.
关键词： Fibonacci search,Photovoltaic systems,maximum power point tracking,NPC inverter,partial shading,boost multilevel
更新于2025-09-12 10:27:22
-
Design of a Photovoltaic System with Ultracapacitor Energy Buffer
摘要： Global concerns over the damage caused to the environment by fossil fuels, as well as the instability of oil prices, has led to an increase interest in alternate electric power generation from renewable sources such as the sun, wind and geothermal energy. Solar energy is produced by solar panels which are made of materials having the capacity to create a flow of electric carriers when exposed to the solar irradiance. The efficiency of these panels depends on the sun light, and they cannot work at their maximum power point independently, hence, requiring Maximum Power Point Tracker (MPPT). This MPPT permits to compensate the changes in irradiance and temperature conditions and variations in load demands which cause power imbalances. As such, a photovoltaic system with supercapacitor energy buffer is designed using Psim software. The system consists of a photovoltaic array, a MPPT, a supercapacitor, and a charge controller which is to effectively balance and regulate power in the system.
关键词： Charge controller,Psim,Solar panel,Maximum Power Point Tracking,Buck-Boost converter,Ultracapacitor
更新于2025-09-12 10:27:22
-
Whale inspired algorithm based MPPT controllers for grid-connected solar photovoltaic system
摘要： Over the past decades, meta-heuristic optimization techniques have become surprisingly very popular due to their flexibility and local optima avoidance capability. This paper uses the Whale Optimization Algorithm (WOA), a swarm-based technique to tune the Proportional-Integral (PI) based Maximum Power Point Tracking (MPPT) controllers of a grid-connected solar Photovoltaic (PV) system. The results of the PI-based Incremental Conductance (IC) MPPT technique are compared with both the conventional incremental conductance and the Perturb & Observe (P&O) MPPT techniques. Various modes of the PI controller are used. I, PI and Fractional order PI (FOPI) gain parameters are determined using WOA. Performance indices are applied to estimate the best parameters of the PI controller. This paper aims to show the effect of using PI-based MPPT controllers on enhancing the performance of a 400-kW grid-connected PV system. Simulation results show the capability of PI-based MPPT controllers on improving the performance of the PV system. It demonstrates the superiority of FOPI controllers over the other modes in enhancing system performance. The proposed work is simulated using MATLAB SIMULINK.
关键词： Photovoltaic,Perturb and Observe,Whale Optimization Algorithm,Proportional-Integral controller,Maximum Power Point Tracking,Incremental conductance
更新于2025-09-12 10:27:22
-
A Maximum Power Point Tracking Algorithm for Photovoltaic Systems under Partially Shaded Conditions
摘要： This paper shows a modification of the traditional ‘perturb and observe’ algorithm used to the maximum power point tracking in photovoltaic systems. The proposal is justified by the need of algorithms to track the global maximum power point in solar panels connected in series under partially shaded conditions. The proposal tracks the global maximum power point avoiding the previous iterative search in local maximums. The algorithm performance is evaluated by simulations in the software PSIM and its behavior is compared with the traditional perturb and observe algorithm. The results show the outstanding performance of the modified algorithm in the tracking of the global maximum power point under different non uniform conditions of temperature and irradiance in the solar array.
关键词： perturb and observe algorithm,photovoltaic systems,DC-DC converters,maximum power point tracking
更新于2025-09-12 10:27:22
-
Annual performance analysis of different maximum power point tracking techniques used in photovoltaic systems
摘要： This paper presents an annual performance evaluation of three maximum power point tracking (MPPT) methods. The used MPPT techniques (Perturb and Observe, Incremental Inductance and Sliding mode) are evaluated under an annual data of atmospheric conditions of the target site. The main contribution of this work is to consider real fluctuation conditions of solar irradiations, ambient temperatures and wind velocities. It was found that the Sliding mode provides higher energy yields independently of the period. Compared to the basic P&O and the IC techniques, sliding mode has the potential of generating up to 8.18% more electrical energy than other techniques.
关键词： Annual performance,Photovoltaic systems,Maximum power point tracking (MPPT)
更新于2025-09-12 10:27:22
-
Recent Developments in Photovoltaic Materials and Devices || A Quick Maximum Power Point Tracking Method Using an Embedded Learning Algorithm for Photovoltaics on Roads
摘要： This chapter presents a new approach to realize quick maximum power point tracking (MPPT) for photovoltaics (PVs) bedded on roads. The MPPT device for the road photovoltaics needs to support quick response to the shadow flickers caused by moving objects. Our proposed MPPT device is a microconverter connected to a short PV string. For real-world usage, several sets of PV string connected to the proposed microconverter will be connected in parallel. Each converter uses an embedded learning algorithm inspired by the insect brain to learn the MPPs of a single PV string. Therefore, the MPPT device tracks MPP via the perturbation and observation method in normal circumstances and the learning machine learns the relationships between the acquired MPP and the temperature and magnitude of the Sun irradiation. Consequently, if the magnitude of the Sun beam incident on the PV panel changes quickly, the learning machine yields the predicted MPP to control a chopper circuit. The simulation results suggested that the proposed MPPT method can realize quick MPPT.
关键词： microconverter,maximum power point tracking (MPPT),incremental learning,modal regression on a fixed memory budget,photovoltaics bedded on road,insect brain,shadow flicker,embedded learning algorithm,partial shading
更新于2025-09-12 10:27:22
-
Dynamic Energy Regulation Strategies with Multi Charging Methods for Photovoltaic Chargers
摘要： The objective of this paper is to propose a photovoltaic charger with multi charging methods and dynamic energy regulation (DER) strategies. A dc-dc boost converter with the maximum power point tracking (MPPT) feature is utilized for the PV charger. Besides, three charging methods are realized by the converter: 1) the constant current charging, 2) the pulse-ripple-current charging and 3) the sinusoidal-ripple-current charging. However, due to unpredictable environment conditions as well as non-ideal operational characteristics of the converter, the power transferred from the PV array might be fluctuated while the charging efficiency will be decreased. Therefore, the aim of this paper is to propose DER strategies for PV chargers. Four different control methods are included in the DER strategy and developed to compensate the energy loss caused by the current limitation of the PV array. Moreover, these strategies are able to prevent the circuit damage caused by non-ideal characteristics. Eventually, the stability and the charging efficiency of the PV charger system can be increased. Finally, both simulation and experimental results obtained from a 1-kW prototype circuit verify the performance and feasibility of the proposed PV charger.
关键词： PV charger,energy regulation strategies,charging methods,maximum power point tracking
更新于2025-09-12 10:27:22
-
An Efficient Fuzzy Logic Control Algorithm for Photovoltaic Maximum Power Point Tracking under Partial Shading Condition
摘要： Under partially shaded conditions, solar photovoltaic (PV) array power-voltage (P-V) characteristic curve will show multiple peaks, and maximum power point tracking (MPPT) by using fuzzy control algorithm is easy to fall into the local optimal solution. In view of the above problems, an improved maximum power point tracking algorithm is proposed based on the fuzzy control method and the differential flatness control theory. Firstly, the output voltage of the PV array increases linearly by using the differential flatness control, and the maximum power point voltage is found. Then the fuzzy control algorithm is used to stabilize the output voltage of the photovoltaic array. The feasibility of the algorithm is verified by MATLAB simulation and hardware experiment.
关键词： maximum power point tracking,differential flatness control,fuzzy logic control,photovoltaic
更新于2025-09-12 10:27:22