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- 实验方案
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An Efficient Technique using Modified p-q Theory for Controlling Power Flow in a Single-Stage Single-Phase Grid-Connected PV System
摘要： In this paper, an efficient power conditioning unit (PCU) is presented for a single-phase grid-connected photovoltaic system (GCPVS) incorporating both maximum power-point tracking (MPPT) and current control algorithms in a single-stage. Modified p-q theory is applied to derive the reference signal for a hysteresis band current (HBC) controller so that independently the active and reactive power sharing between the photovoltaic (PV) system and the grid can be controlled. Enhanced stability during the internal dynamics, caused by the variations in PV generation and load conditions, is the prime aspect of the controller. The performance of the proposed p-q theory correlated HBC controller is evaluated against tracking of maximum PV power and compensation of load reactive power under the changeable atmospheric and load conditions, and also compared with the widely used conventional proportional resonant (PR) controller to justify superiority. Simulation and experiment are carried-out under variable weather and different load conditions to validate acceptability of the proposed control scheme.
关键词： modified p-q theory,Single-stage,hysteresis band current (HBC) controller,grid-connected photovoltaic system (GCPVS),power flow controlling
更新于2025-09-23 15:23:52
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[IEEE 2018 China International Conference on Electricity Distribution (CICED) - Tianjin (2018.9.17-2018.9.19)] 2018 China International Conference on Electricity Distribution (CICED) - Analysis on Operation Characteristics of Grid - Connected Inverter in Photovoltaic Power Generation
摘要： These instructions give you guidelines for IEEE TRANSACTIONS and preparing papers JOURNALS. Use this document as a template if you are using Microsoft Word 6.0 or later. Otherwise, use this document as an instruction set. The electronic file of your paper will be formatted further at IEEE. Define all symbols used in the abstract. Do not cite references in the abstract. Do not delete the blank line immediately above the abstract; it sets the footnote at the bottom of this column.
关键词： grid - connected,Photovoltaic grid – connected,control strategy,inverter
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC) - Santos, Brazil (2019.12.1-2019.12.4)] 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC) - Optimal Voltage Coordinated Control for Grid-connected Photovoltaic Systems
摘要： The intermittent penetration of Grid-connected photovoltaic systems and load changing in distribution feeders can cause voltage ?uctuation. This paper aims to analyze the performance of different power control strategies to avoid overvoltage in MV feeders. The strategies use Volt/Var control and Volt/Watt control techniques to ?nd the optimal active or reactive power to be injected/absorbed by the PV inverters with the aim to minimize the voltage deviation and power losses and also coordinate the grid-connected photovoltaic system with the voltage regulation devices of distribution feeders. The strategies are tested in the IEEE 13 node test feeder.
关键词： active and reactive power control,grid-connected photovoltaic systems,Voltage regulation
更新于2025-09-23 15:21:01
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Techno-economic optimization of grid-connected, ground-mounted photovoltaic power plants by genetic algorithm based on a comprehensive mathematical model
摘要： The increasing penetration of photovoltaic (PV) technology calls for the development of an effective method for optimization of grid-connected photovoltaic power plants. This paper presents a simultaneous optimization method of ten important design parameters of a PV plant, including the module power, inverter sizing, support structure dimensions, cable losses, module orientation and row spacing. A mathematical PV performance model taking into account the important effects and losses and an economic cost model were developed and presented in detail. The objective function is the internal rate of return and the optimization is performed by a genetic algorithm. The results show that the proposed models and method are capable to optimize the grid-connected PV plant and provide reliable results after a 6–7 min calculation time. The method was demonstrated in detail for a Hungarian location, including the losses and cost structure of the optimal plant configuration. The optimization was also performed for 5 additional sites around the world to assess the effect of location and meteorology. The impact of the decreasing PV module prices on the optimal design is calculated to identify the expected future trends in PV plant design. The presented optimization method can be utilized to facilitate the optimal design of commercial PV plants and for research purposes.
关键词： Modeling,Optimization,Genetic algorithm,Grid-connected photovoltaic plants
更新于2025-09-23 15:21:01
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Grid-connected photovoltaic system employing a single-phase T-type cascaded H-bridge inverter
摘要： This paper presents the control and application of a single-phase T-type nine-level cascaded H-Bridge (TCHB) multilevel inverter (MLI) topology. This paper focuses on the effectiveness of the TCHB and its control by presenting the inverter operation based on a PI current controller along with a Maximum Power Point Tracking (MPPT) scheme to realize a grid-tied photovoltaic (PV) system and a novel PWM method offering self-balancing at the DC-link capacitors. In order to attain gating signals for power transistors (IGBTs), the TCHB employs a PWM with one triangular carrier signal and eight reference signals. In addition, a mathematical modelling of the PWM method, along with a theoretical explanation of the self-balancing process has also been provided. To prove the effectiveness of the proposed TCHB topological design, it has been comparatively analysed against other fundamental MLI and symmetric CHB topologies. In addition, to corroborate the working of the control and the PV system application, levels ( ± 2Vdc, ± 2?Vdc, ± Vdc, ± ?Vdc, 0), simulation and hardware results have been presented.
关键词： Nine-level inverter,Pulse Width-Modulation (PWM),Grid-connected,Photovoltaic (PV) system,T-type cascaded H-bridge
更新于2025-09-23 15:19:57
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In-situ performance and degradation of three different photovoltaic module technologies installed in arid climate of Morocco
摘要： This paper presents the results of a first-time study on the long-term performance, degradation and cost analysis of three different PV module technologies - monocrystalline silicon (m-Si), polycrystalline silicon (p-Si), and amorphous silicon (a-Si) - installed in the desert climate of Errachidia, Morocco. It mainly aims to determine the most adapted module technology. The performance ratio (PR), degradation rate (Rd) and levelized cost of electricity (LCOE) indicators have been determined for each installed PV technology. Results revealed that p-Si technology exhibits the best performance with the highest PR of 82.54 ± 5.84 % compared to 82.24 ± 4.77 % for m-Si and 81.36 ± 3.79 % for a-Si. However, the p-Si technology degrades faster with 0.92 ± 0.11 %/year compared to 0.45 ± 0.11 %/year for m-Si and 0.72 ± 0.11 %/year for a-Si. Thus, the generated energy and the calculated Rd of the investigated technologies are used for the LCOE calculation. Indeed, the lowest LCOE value is noticed for p-Si system with 10.32 c€/kWh compared to 11.15 c€/kWh for m-Si and 13.18 c€/kWh for a-Si.
关键词： Performance,Degradation,Grid-connected,Photovoltaic,LCOE,Arid climate
更新于2025-09-19 17:13:59
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Experimental performance assessment of a 2.25 kWp Rooftop PV system installed in the desert environment: a case study of Ghardaia, Algeria
摘要： The outcomes of an experimental study performed on a single grid-connected photovoltaic plant on the roof of parking are disclosed in the present paper. The PV system is located in southern Algeria (Latitude 32.26 N°, and longitude 03.46E°) at the Renewable Energy Applied Research Unit (URAER), Ghardaia, Algeria. This location is a desert and with a semi-arid climate. The performance results had been monitored for one year 2018. The present study aims to investigate the effect of seasonal variation on output parameters of PV systems. The results of some index parameters such as performance ratio (PR), array losses, system losses and yields (reference yield, array yields and system yields) are presented and discussed. Experimental results show that an essential variation in performance parameters has been seen for different seasons. The results show the maximum energy generated, reference yield, array yield, final yield, capacitor factor, capture and system losses in summer were 307,11 kW h/kWp, 5,35 kW h/kWp/day, 5,01 kW h/kWp/day, 4,74 kW h/kWp/day, 20,17%, 0,34 h/day and 0,27 h/day, respectively, while the maximum value of performance ratio (PR) was observed in winter (93, 06%). The grid is fed with a power of 3327, 15 kWh along the year.
关键词： grid-connected photovoltaic system,performance loss,The outdoor study,semi-arid climate,seasonal variation
更新于2025-09-19 17:13:59
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A novel photovoltaic inverter topology based on common mode current suppression
摘要： Aiming at the problems of large leakage current and low efficiency of existing transformerless single-phase grid-connected photovoltaic inverters, a novel transformerless single-phase grid-connected photovoltaic inverter topology is proposed. In this topology, two freewheeling diodes are added to the single-phase full-bridge inverter, and the filter inductors are moved between the upper and lower bridge arms, so that the common mode voltage remains constant during the switching period and the common mode current is effectively suppressed. Meanwhile the high frequency switch uses MOSFET to reduce the switching loss, and the power frequency switch uses IGBT to reduce the conduction loss, and additional switches are avoided, thus the overall system losses are reduced. Finally, through simulation and the experimental platform of 3kW single-phase grid-connected photovoltaic inverter, it is verified that compared with the traditional full-bridge topology, the novel topology can effectively suppress the common mode current, while compared with the H5 and H6 topology, the novel topology reduces the system loss and improves the system efficiency.
关键词： efficiency,loss,single-phase grid-connected photovoltaic inverter,transformerless,common mode current
更新于2025-09-19 17:13:59
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Coordinated reactive power strategy using static synchronous compensator for photovoltaic inverters
摘要： Large photovoltaic (PV) penetrations into the electric grid resulted in new challenges such as reverse power flow and violation of voltage profile. The traditional methods for voltage regulation in a grid-connected PV system are hardly adaptable to these changes as they only contain the local information which is used without the knowledge of how the control action affects the overall system. To address this problem, this paper extends the reactive power control capability of solar PV inverters by combining them with static power electronic devices for regulating voltage during grid faults. For efficient identification of grid faults, a support vector machine-based fault classification mechanism is developed. The proposed method prioritizes the reactive power control using PV inverter by adapting a predefined hierarchical control structure. The complete methodology is realized by testing it with a two-stage single-phase grid-connected PV system. The experimental results verify the accuracy of the classification algorithm and depict the effectiveness of the proposed controller in both under and overvoltage situations.
关键词： fault ride through (FRT),reactive power control,islanding classification,grid-connected photovoltaic system (GCPVS)
更新于2025-09-19 17:13:59
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Technical analysis of photovoltaic energy generation for supplying the electricity demand in Brazilian dairy farms
摘要： In many Brazilian dairy farms, the supply of electrical energy does not fully meet the demands of the production systems and/or presents frequent fluctuations and interruptions, making the expansion of production chain unfeasible. These and other barriers have motivating the adoption of renewable and independent energy sources, installed directly in the farms. The present study was conducted to perform a technical analysis of photovoltaic energy generation required for supplying the electricity demand in dairy farms located at Minas Gerais State, Brazil. Daily global radiations on tilted panels were estimated by mathematical models and long-term meteorological database (greater than 33 years). Electrical energy generated by grid-connected photovoltaic systems was predicted considering minimum, average, and maximum daily global radiation conditions. Electrical energy demands were monitored in small (66 cows), medium (106 cows), and large (158 cows) dairy farms. The direct use of electrical energy in operations performed at Brazilian dairy farms were 4, 28, 15, 39, and 15%, on average, for lighting, milking, water heating/pumping, milk cooling/refrigeration, and miscellaneous, respectively. The estimated energy consumptions were 0.96, 0.87, and 0.81 kWh cow?1 day?1 for farms with 66, 106, and 158 cows, respectively. The photovoltaic panel area varied considerably among small, medium, and large dairy farms in order to meet 80% of renewable fraction for the electricity demand.
关键词： Solar radiation models,Photovoltaic panels,Grid-connected photovoltaic system,Energy consumption,Renewable energy,Farm building
更新于2025-09-16 10:30:52