- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
A Dual-Discrete Model Predictive Control-based MPPT for PV systems
摘要： This paper presents a method that overcomes the problem of the confusion during fast irradiance change in the classical MPPTs as well as in model predictive control (MPC)-based MPPTs available in the literature. The previously introduced MPC-based MPPTs take into account the model of the converter only, which make them prone to the drift during fast environmental conditions. Therefore, the model of the PV array is also considered in the proposed algorithm, which allows it to be prompt during rapid environmental condition changes. It takes into account multiple previous samples of power, and based on that is able to take the correct tracking decision when the predicted and measured power differ (in case of drift issue). After the tracking decision is taken, it will be sent to a second part of the algorithm as a reference. The second part is used for following the reference provided by the first part, where the pulses are sent directly to the converter, without a modulator or a linear controller. The proposed technique is validated experimentally by using a buck converter, fed by a PV simulator. The tracking efficiency is evaluated according to EN50530 standard in static and dynamic conditions. The experimental results show that the proposed MPC-MPPT is a quick and accurate tracker under very fast changing irradiance, while maintaining high tracking efficiency even under very low irradiance.
关键词： Buck converter,dc-dc power conversion,Photovoltaic systems,Double cost function,Maximum power point tracking,Drift,EN50530 standard,MPC
更新于2025-09-23 15:22:29
-
92.5% Average Power Efficiency Fully Integrated Floating Buck Quasi-Resonant LED Drivers Using GaN FETs
摘要： LEDs are highly energy ef?cient and have substantially longer lifetimes compared to other existing lighting technologies. In order to facilitate the new generation of LED devices, approaches to improve power ef?ciency with increased integration level for lighting device should be analysed. This paper proposes a fully on-chip integrated LED driver design implemented using heterogeneous integration of gallium nitride (GaN) devices atop BCD circuits. The performance of the proposed design is then compared with the conventional fully on-board integration of power devices with the LED driver integrated circuit (IC). The experimental results con?rm that the fully on-chip integrated LED driver achieves a consistently higher power ef?ciency value compared with the fully on-board design within the input voltage range of 4.5–5.5 V. The maximal percentage improvement in the ef?ciency of the on-chip solution compared with the on-board solution is 18%.
关键词： fully on-chip,gallium nitride (GaN),?oating buck converter,complementary-metal-oxide-semiconductor (CMOS),quasi resonance,integrated LED driver,heterogeneous integration
更新于2025-09-23 15:21:01
-
A photovoltaic powered electrolysis converter system with maximum power point tracking control
摘要： One of the main problems for renewable and other innovative energy sources is the storage of energy for sustainability. This study focuses on two different scenarios to benefit from solar energy more efficiently. Photovoltaic (PV) energy is converted to the desired voltage level using a buck converter for generating hydrogen with electrolysis process. A maximum power point tracking (MPPT) algorithm is used to benefit from the photovoltaic sources more efficiently. The basic electrolysis load for hydrogen production needs low voltage and high current and controlled sensitively to supply these conditions. The photovoltaic powered buck converter for electrolysis load was simulated in MATLAB/Simulink software using a perturb and observe (P and O) MPPT algorithm and PI controller. The simulation results show that in normal, short circuit and open circuit working conditions the PV and load voltages are stabilized. The efficiency of the proposed system is reached more than 90% for high irradiance levels.
关键词： Maximum power point tracking,Electrolysis process,Hydrogen energy generation from PV,DC-DC buck converter,Perturb and observe method,Proportional integral control
更新于2025-09-23 15:19:57
-
Performance Analysis of Single-Stage LED Buck Driver Topologies for Low-Voltage DC Distribution Systems
摘要： The demand for lean protein is the main reason for raising domesticated birds in poultry farms for the purpose of farming meat or eggs for food. In these poultry farms, artificial lighting system is an essential factor for the success of the commercial production of egg layers and broilers. Lighting loads connected to the existing AC system requires DC power. Nearly 25% of the total power consumed in India is by lighting loads. Therefore, low-voltage DC distribution system is the new requirement of electrical network to improve energy conservation. In this paper, an energy efficient single-stage LED driver topology is proposed as a better alternative to fluorescent lights used in poultry farms. The proposed topology is a phase-shifted buck converter with reduced size of passive components. The converter is mathematically modelled and designed for a power of 24 W LED lights. An experimental prototype is developed for the proposed converter and the results are validated in terms of cost, energy savings, and energy efficiency with various other LED driver topologies like conventional buck converter and interleaved buck converter. Further to justify the outcome of the proposed LED driver, a case study is also done for poultry farms.
关键词： energy savings,Phase-Shifted Buck Converter (PSBC),dimming control,digital controller,LED driver
更新于2025-09-19 17:13:59
-
[IEEE 2019 IEEE Canadian Conference of Electrical and Computer Engineering (CCECE) - Edmonton, AB, Canada (2019.5.5-2019.5.8)] 2019 IEEE Canadian Conference of Electrical and Computer Engineering (CCECE) - A Novel Control Methodology for Stand-Alone Photovoltaic Systems Utilizing Maximum Power Point Tracking
摘要： This paper introduces an innovative Maximum Power Point Tracking (MPPT) technique to extract maximum available power from a Photovoltaic (PV) system irrespective of temperature, solar irradiation and load anomalies. A single-stage DC-DC buck converter that extracts maximum power from the connected PV module and controls the output battery state of charge (SoC) is a key component in achieving this target. The introduced circuit consists of three subsystems: a PV module, a Buck converter and an MPPT plus voltage regulation controller. MPPT is achieved via a novel methodology, not only applies to maximum energy extraction of the PV module but also combined with a feedback optimization of the battery charging and discharging modes. The developed system is geared towards Internet of Things (IoT) based wireless sensor nodes (WSN). In the proposed solution, power harvested from the PV module is combined with the battery power; to guarantee that the connected load receives a full supply of power. To maximize the energy conversion a converter controlled MPPT algorithm - Perturb and Observe (P&O) which considers the non-linear output of the PV is utilized with the aid of the buck converter. The validity of the introduced system is tested using the simulation model in PSIM and the results are presented and discussed.
关键词： Photovoltaic System,MPPT,Buck Converter,Perturb and Observe
更新于2025-09-19 17:13:59
-
Disturbance observer based robust voltage control of photovoltaic generator interfaced by current mode buck converter
摘要： In this paper, a new control method for photovoltaic generator is presented. The novel method is implemented on photovoltaic generator charging a battery storage system thru buck converter. The controller tasks are re-shaping the buck plant converter, and cancel its right half-pole while keeping tight reference tracking and disturbance rejection. Moreover, the integrated system of generator-converter-load possesses nonlinear behavior due to the varying environmental conditions and the boundaries of photovoltaic generator versus battery state of charge, as revealed from an analysis of small-signal equations for possible unstable condition. It was shown that system constrains consequence in a complicated control task where standard controller of an inverse plant is insufficient to stabilize the system. Then a proportional integral controller is implemented. However, it is shown that varying closed-loop performance from over-damped to under-damped, depending on the operating point. Eventually utilizing a robust disturbance observer controller reveals that closed-loop performance remains nearly nominal throughout the entire operation range.
关键词： Microgrid,Disturbance observer,Photovoltaic generator,Robust control,PV,Buck converter
更新于2025-09-19 17:13:59
-
[IEEE 2019 4th World Conference on Complex Systems (WCCS) - Ouarzazate, Morocco (2019.4.22-2019.4.25)] 2019 4th World Conference on Complex Systems (WCCS) - An Accurate Photovoltaic Source Emulator with High-Bandwidth Using a Backstepping Controller
摘要： This paper presents the design and development of a photovoltaic (PV) source emulator able to behave similarly as an actual PV module irrespective of environmental conditions change, it consists basically of a switch mode power supply (SMPS) controlled by a backstepping technique with a control strategy of referencing. The backstepping strategy is used to guaranty more accuracy and stability of the system and ensure a high bandwidth in order to track faithfully the Current-Voltage (I-V) characteristic of a desired PV module. Simulation results are given and discussed so as to validate the functioning of the proposed PV emulator as well as evaluate the performances of the suggested control technique in terms of accuracy, speed, and robustness against load and weather parameters variation.
关键词： Backstepping technique,control strategy,PV array emulator,buck converter
更新于2025-09-16 10:30:52
-
Charging Strategy of Supercapacitor in Photovoltaic Power Generation System
摘要： The charging efficiency of supercapacitor under different charging methods is analyzed by using the improved RC model of supercapacitor. A photovoltaic cell charging system for supercapacitor based on Boost cascade Buck converter (BOCBB) is proposed. The former Boost converter is connected to the photovoltaic power generation system, and the conductance increment method is used to track the maximum power point of the photovoltaic cell. The latter Buck converter uses a segmented charging strategy to charge the supercapacitor. Based on this circuit, a complete control method for the supercapacitor charging system is proposed. Finally, the charging efficiency of supercapacitor by photovoltaic cells under different lighting conditions is simulated and analyzed.
关键词： Boost cascade Buck converter,charging strategy,conductance increment method,supercapacitor,photovoltaic power generation
更新于2025-09-16 10:30:52
-
[IEEE 2018 IEEE Nordic Circuits and Systems Conference (NORCAS): NORCHIP and International Symposium of System-on-Chip (SoC) - Tallinn, Estonia (2018.10.30-2018.10.31)] 2018 IEEE Nordic Circuits and Systems Conference (NORCAS): NORCHIP and International Symposium of System-on-Chip (SoC) - An 87% Peak Efficiency, 37W, Class H Audio Amplifier with GaN Output Stage
摘要： This paper presents a novel high output power class H audio amplifier design with GaN transistors output stage. The design is implemented in 0.18-μm BCD process. Several design techniques to drive the GaN output stage and to improve the efficiency of the class H amplifier are introduced in this paper. The design consumes 706.3mW quiescent power and can deliver up to 37W peak output power to the load of 32Ω with the peak power efficiency of 87%. This design achieves the lowest THD+N ratio of -70.17dB.
关键词： bootstrap,efficiency,adaptive supply,total harmonic distortion,class h amplifier,Audio amplifier,buck converter
更新于2025-09-09 09:28:46
-
[IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Supervisory Control Architecture for Standalone Solar Photo- Voltaic Power Generation System
摘要： Solar Photo-Voltaic (SPV) based power generation system is an attractive alternative to diesel based counterparts for standalone or dual-mode AC micro-grids. Typically, a suitably sized battery-based energy storage system is required alongside PV that supplies power when solar energy and the grid are unavailable. In this work, a supervisory control architecture is proposed for the operation of such an SPV micro-grid system with battery storage. Three sub-modes of operation of the SPV converter, namely, Charger (CHGR), Maximum Power Point Tracking (MPPT) and Virtual Battery Emulation (VBE) modes are deployed to suitably control the system and manage power ?ow under varying conditions of battery voltage, load power, and solar insolation. The novel VBE mode emulates a parallel battery bank with the aid of the SPV converter and its appropriate control. This reduces the battery discharge and thus ensuring the extension of its cycle life. A ?nite state machine is presented that facilitates digital implementation of the proposed supervisory control scheme. Experimental results of various modes on a 1.2 kW SPV system prototype are presented for performance verification.
关键词： battery charging,buck converter,MPPT,Solar PV,battery emulation,supervisory control
更新于2025-09-04 15:30:14