- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Validation of autonomous renewable energy hybrid wind/photovoltaic/RHFC prototype for the cell tower industry using MATLAB/Simulink
摘要： A large number of telecommunication base stations operate on unreliable grid or no grid at all, and rely on batteries or diesel generators for primary or back-up energy. This paper proposes an autonomous renewable energy micro-grid, using Solar Photovoltaics and Wind Turbine to generate electricity, and a Regenerative Hydrogen Fuel Cell as back-up power for up to 10 days. The system is validated using MATLAB/Simulink software and real-life weather data and optimized for a 25kW micro-grid near Dakar, Senegal. The simulations show a smart load-following system that instantaneously recognizes the cheapest source of electricity to power the load. Levelised Cost of Electricity based on the outcomes of the MATLAB/Simulink model show the economic potential of an RHFC as back-up for micro-grids, allowing cheap and reliable electricity to rural areas in developing countries, with a LCOE of 6.71 p/kWh, RHFC is by far the cheapest back-up for this application.
关键词： Simulation,Energy Storage,Hydrogen,Fuel Cell,Renewable Energy
更新于2025-09-16 10:30:52
-
Solar Engineering of Thermal Processes, Photovoltaics and Wind || Building Heating
摘要： Heat for comfort in buildings can be provided from solar energy by systems that are similar in many respects to the water heater systems described in Chapter 12. The two most common heat transfer fluids are water (or water and antifreeze mixtures) and air, and systems based on each of these are described in this chapter. The basic components are the collector, storage unit, and load (i.e., the house or building to be heated). In temperate climates, an auxiliary energy source must be provided and the design problem is in part the determination of an optimum combination of solar energy and auxiliary (i.e., conventional) energy. Systems for space heating are very similar to those for water heating, and the same considerations of combination with an auxiliary source, boiling and freezing, controls, and so on, apply to both applications.
关键词： solar energy,storage unit,auxiliary energy,collector,heat transfer fluids,heating systems
更新于2025-09-16 10:30:52
-
Solar Engineering of Thermal Processes, Photovoltaics and Wind || Solar Process Loads
摘要： The supply of solar energy from a collector is time dependent. In general, loads to be met by an energy system are also time dependent. Energy storage, as outlined in the previous chapter, provides a buffer between these two time-dependent functions. In Chapters 6 and 7 we discussed calculation of collector output. In this chapter, we outline briefly the common methods for calculating some common loads and provide references which will provide much more detailed information.
关键词： energy storage,wind,solar energy,thermal processes,photovoltaics
更新于2025-09-16 10:30:52
-
Photovoltaic Synchronous Generator (PVSG): Architecture and Control Strategy for A Grid-Forming PV Energy System
摘要： Transforming conventional PV energy system from a grid following one to a grid forming is necessary when PV power generation is dominating the generation mix and replacing traditional synchronous generators. Grid forming PV energy system can provide frequency support functionality which is vital for the stability of the power grid. This paper presents a novel AC coupled solution that transforms an existing grid following PV system to a grid forming one without any hardware and software modification of the PV inverter. The resulting system, the Photovoltaic Synchronous Generator (PVSG), is achieved by an AC coupled supercapacitor-based energy storage system (ESS). The novel control of the PVSG is implemented in the ESS side. The novel control scheme includes a fast and slow instantaneous power controls. The fast-instantaneous power flow control is fulfilled by the DC-link voltage control and AC voltage control. The cascaded voltage source controls enable the fast-instantaneous power balance, while a slow instantaneous power control is used to implement the inertia and grid synchronization. Two important fundamental functions are realized in the PVSG. The first one is the frequency inertia to resist the grid frequency variation where the df/dt-based power control is achieved; the second one is the inertia against the PV intermittent power. The correctness and effectiveness of the proposed PVSG is validated experimentally in a 480V PVSG prototype with TMS320F28379D DSP controller.
关键词： current controlled,power control,PVSG,virtual synchronous generator (VSG),Inertia,voltage controlled,grid-forming inverter,supercapacitors,energy storage system,inverter control
更新于2025-09-16 10:30:52
-
[IEEE 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Xi'an, China (2019.6.19-2019.6.21)] 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Robust Predictive Current Control for Photovoltaic Energy Storage System Based on Second-order Tracking Differentiator
摘要： Aiming at the problem of DC bus voltage fluctuation due to the change of photovoltaic (PV) output power, load mutations and nonlinear loads connection in DC microgrid system including PV power generation and energy storage, the robust predictive current control (PCC) for photovoltaic energy storage system based on second-order tracking differentiator (STD) is proposed in this paper. The traditional current loop controller based on PI is replaced by the controller based on the PCC. And the second-order tracking differentiator for the DC bus voltage control system of bidirectional DC-DC converters is designed. The second-order tracking differentiator can track the equivalent disturbance current quickly in the system without adding additional current sensors. Feed forward method based on the STD is proposed to improve the disturbance rejection capability of the system. The simulation results show that the DC bus voltage fluctuations can be suppressed effectively by using the predictive current control based on second-order tracking differentiator, and the dynamic performance and robustness of the system are improved.
关键词： Photovoltaic Energy Storage System,Second-order Tracking Differentiator,Predictive Current Control,Bidirectional DC-DC Converter
更新于2025-09-16 10:30:52
-
[IEEE 2019 International Conference on Sustainable Energy Engineering and Application (ICSEEA) - Tangerang, Indonesia (2019.10.23-2019.10.24)] 2019 International Conference on Sustainable Energy Engineering and Application (ICSEEA) - Power Control among Photovoltaics and Electric Energy Storages in DC Microgrid
摘要： Photovoltaic (PV) is one of the most popular renewable energy sources today. Outputs of PVs are fluctuated according to the sunlight intensity. Contrary with the PVs outputs, the Microgrid networks are required continuous power for supplying their load demands. To overcome this issue, the Electrical Energy Storages (ESSs) are introduced in the DC Microgrid network. Introducing PVs and ESSs in the same network poses several issues. The control of the voltages, currents and powers outputs among PVs and ESSs during load demand fluctuations is one of the critical issue which should be considered. On the other hand, The PVs and ESSs have different generated power capacities and hence, the suitable control candidate should be able to adjust the generated power by PVs and ESSs according to their capacities. There are three operational modes options in DC Microgrid based PVs and ESSs. These operational modes are introduced, analyzed, simulated and discussed in this paper. The performance of the proposed method is conducted via computer simulation of Simulink during fluctuations of the load demands. The simulation results indicate that the proposed method is successful to maintain the network voltages are within acceptable limit during load demands fluctuations. And the generated power by PVs and ESSs are regulated within designated capacities as well.
关键词： power control,photovoltaic,electric energy storage,voltage control,DC microgrid
更新于2025-09-16 10:30:52
-
[IEEE IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Lisbon, Portugal (2019.10.14-2019.10.17)] IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Design and Control of a Photovoltaic-Fed Dc-Bus Electric Vehicle Charging Station
摘要： This paper presents a stand-alone dc-bus Electric Vehicle (EV) charging station system using a photovoltaic (PV) source. The proposed topology includes a PV panel, an energy storage unit (ESU), and two EVs. Each unit is controlled independently; a voltage regulation scheme is implemented within the ESU converter to ensure the dc bus voltage is maintained at the nominal level under varying operating conditions. Two different operating scenarios are studied, and the results confirm that the algorithm developed allows regulating the dc bus voltage either with varying solar irradiance or when EVs are connected and disconnected from the dc grid. The proposed design offers lower energy conversion losses compared to the ac configuration and reduces energy demand on the existing ac distribution grid. It also finds applications in remote areas where parking facilities are provided for recreational purpose.
关键词： Electric Vehicle,Charging Stations,Photovoltaic,Energy Storage,Voltage control
更新于2025-09-16 10:30:52
-
Ferroelectric ordering and energy storage capacity in lead-free Ba(Zr <sub/>0.2</sub> Ti <sub/>0.8</sub> )O <sub/>3</sub> nanoscale film capacitors fabricated using pulsed laser deposition technique
摘要： Dielectric thin film capacitors, storing large charge density, are useful in electric energy storing devices. Highly oriented lead-free BaZr0.20Ti0.80O3 (BZT20) thin films were grown on a conducting bottom layer La0.7Sr0.3MnO3 deposited on a MgO (100) substrate under an oxygen atmosphere using a pulsed laser deposition technique. X-ray diffraction studies indicate that BZT20 films were stabilized in a (100) oriented tetragonal phase. Microstructural studies on thin films indicate a smooth film (a roughness of ～1.25 nm) with a thickness of around 320 nm. The structural sensitive A1(TO2) Raman band exhibits a discontinuous change across the tetragonal-cubic phase transition temperature Tc ～ 275 K. The appearance of the broad Raman band in the cubic (Pm?3m) phase at an elevated temperature suggests the activation of symmetry forbidden Raman active bands. The temperature dependent band frequency and integrated intensity of the structural sensitive A1(TO2) band show anomaly across Tc. Temperature dependent dielectric studies (100–650 K) carried out in a wide range of frequencies 102–106 Hz on a fabricated Pt/BZT20/LSMO metal-insulator-metal capacitor suggest a broad dispersive peak of around 290 K. The polarization relaxation follows the Vogel-Fulcher relation with an activation energy of Ea = 0.047 eV and a freezing temperature of Tf = 246 K. The slim polarization P-E loops with a remanent polarization of ～89.6 μC/cm2 and an EC value of ～0.29 MV/cm were observed, suggesting its local ferroelectric ordering in corroboration with Raman and dielectric findings. From the P-E loop analysis, a large energy storage density of 31.9 J/cm3 and an energy storage efficiency of 56% were obtained. Our experimental results revealed that the BZT20 thin film capacitors have potential for energy storage device applications.
关键词： Ferroelectric ordering,Ba(Zr0.2Ti0.8)O3,energy storage capacity,nanoscale film capacitors,lead-free,pulsed laser deposition technique
更新于2025-09-16 10:30:52
-
[IEEE 2019 International Conference on Computer, Electrical & Communication Engineering (ICCECE) - Kolkata, India (2019.1.18-2019.1.19)] 2019 International Conference on Computer, Electrical & Communication Engineering (ICCECE) - Development of Current Sensorless Photovoltaic MPP Tracker
摘要： Recent advances in energy storage devices (ESDs) technology have enabled new guidance strategies for power generation and distribution on hybrid marine power plants, supported by new class regulations. In this paper, a new model to calculate the fuel saving and emission reduction potential is derived based on the ESD maximum charge/discharge rate, engine efficiency, and specific fuel oil consumption (SFOC) curve. Several cases were analyzed with generator disconnection and also without it. Spline approximation for the discrete fuel oil consumption curve is used for numerical solution and later optimized using the Karush–Kuhn–Tucker method. A second approach is proposed, using linear interpolation, reducing the optimization process computational time. It is shown that fuel savings can be increased and emissions reduced by charging and discharging the energy storage device. This is denoted as strategic loading according to the proposed model. The cases with highest potential for fuel saving are shown to be cases where generators are disconnected.
关键词： energy storage,analytical models,Hybrid power systems,smart grids,optimization,fuel economy,numerical models
更新于2025-09-16 10:30:52
-
Night operation, analysis, and control of single-phase quasi-Z-source photovoltaic power system
摘要： The existing single-phase, quasi-Z-source inverter (qZSI), photovoltaic (PV) power system with integrated battery energy storage (BES), abbreviated as BES-qZSI-PV power system, has several well-known advantages, but cannot operate at night because there is no PV power input. In this study, a solution to overcome this issue is proposed. First, the power circuit of the conventional BES-qZSI-PV topology is modified to allow its operation at both day and night. Then, the system model for the night-operation mode is built and a qZS network parameters’ design method to limit the double-line frequency harmonic at the dc side is developed. A control strategy to ensure the high-performance operation of the system at all times, is proposed. Based on an experimental platform of single-phase BES-qZSI-PV power system, three groups of experimental tests with different qZS network parameters and battery voltages are carried out to verify the model and parameters design method by means of comparing the experimental, circuit-based simulated, and model-based calculated results. The proposed BES-qZSI-PV system performance is experimentally evaluated in steady-state operation and day-to-night transit operation, as well as by the power efficiency curves in day- and night-modes.
关键词： double-line frequency harmonic,night operation,photovoltaic,control strategy,battery energy storage,quasi-Z-source inverter
更新于2025-09-16 10:30:52