- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Comparison of Bifacial Solar Irradiance Model Predictions With Field Validation
摘要： Models predicting rear irradiance for bifacial systems are critical to establish accurate estimates of energy yield. Here, we compare five published bifacial irradiance models, varying clearance, row spacing, tilt, and albedo to measure the sensitivity to these parameters. Bifacial energy gains (BGE) as high as 20% are predicted for some configurations. Model agreement is generally good for low ground clearance (clearance heights lower than 0.75 times the collector width), but at higher clearances, finite system size and edge effects become a significant factor in simulations, stretching assumptions of infinite system extent made in some models. In addition, rear irradiance uniformity is improved at high ground clearance, as expected. A test-bed construction and results are described for comparison between modeled and measured data in Golden, CO, USA. The investigations indicate that model agreement for BGE calculation is better than 2% (absolute) when compared with measured results, depending on the system configuration.
关键词： photovoltaic (PV) system modeling,Bifacial solar panels,irradiance modeling
更新于2025-09-04 15:30:14
-
[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) - Ageing Mitigation Control Method for Power Devices in Multilevel Inverters in Standalone PV Systems
摘要： Multilevel inverters (MIs) have become widely used in photovoltaic (PV) systems for their high efficiency, reduced leakage currents, and reduced EMI levels. Although MIs suffer from unequal thermal stresses in power devices that lead to aging of power device with their continuous operation. Therefore, this paper proposes a new aging mitigation control (AMC) method to enhance the reliability of MIs against the aging effects in power devices. The operation of the proposed AMC method has three operating modes that are adapted according to the level and type of aging. In small and medium aging levels, the proposed method preserves the full output power ratings of the inverter with maximum energy extraction from PV modules. Whereas, in high aging level region and multiple devices failures, the proposed method reduces the output power so as to maintain continuous operation of the inverter without harmful consequences. The simulation and experimental results with comparisons to conventional methods show effective performance of the proposed AMC method.
关键词： lifetime,multilevel inverters (MIs),pulse width modulation (PWM),reliability,photovoltaic (PV),aging
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Kota Kinabalu, Malaysia (2018.10.7-2018.10.10)] 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - A New Five-Level Inverter Topology with Voltage Controller for Grid-Connected PV System
摘要： Photovoltaic (PV) systems are growing in demand due to the recent drop in prices of the solid state components. However, the quality of the output of the PV systems are still lacking behind and this is a major problem while connecting the system to the grid. Inverters being the brains of a solar PV system need to be made smarter and better. Multi-level inverters are one of the most popular types of inverters for grid-connected PV systems due to the higher quality output they can produce than other inverters. One of the key features they provide is the minimization of total harmonic distortion (THD) and electromagnetic interference which tackles leakage current issue. So, in this paper a new five-level inverter topology for grid-tie PV is proposed which is controlled using a new voltage controller that ensures higher efficiency while enhancing the stability of the system. The suggested closed loop voltage controller method additionally provides the ability to provide constant or adjustable voltage to the grid. In this proposed topology the voltage controller enables the PV system to provide high quality power to the grid which is vastly important. To validate the accuracy of the theoretical analysis, the control technique was applied to the existing multi-level inverter topology and then has been simulated in MATLAB/Simulink software. Moreover the five-level output provides a much better output and better PF then other existing topologies.
关键词： closed loop system,total harmonic distortion (THD),Solar photovoltaic (PV) system,multi-level inverter,sinusoidal pulse width modulation (SPWM),voltage controller
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Kota Kinabalu, Malaysia (2018.10.7-2018.10.10)] 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - A Novel Compensation Current Control Method for Grid-Connected PV Inverter to Improve Power Quality in Micro-Grid
摘要： This paper presents a new control method for grid-connected pulse width modulation (PWM) inverters to reduce the output current harmonic distortion in a wide range of applications, including photovoltaic (PV) inverter. The proposed control method is designed to eliminate harmonics in micro-grid and to correct the system unbalance. The proposed technique is able to increase the inverter output current around 18 times of conventional one. Another advantage of the proposed control method is that it can be easily adopted into the distributed generation (DG) control system without the installation of extra hardware. The proposed control method comprises of the advance synchronous reference frame method (ASRF).
关键词： photovoltaic (PV),micro-turbine (MT),power quality,three-phase grid-connected inverter,Distributed generation (DG)
更新于2025-09-04 15:30:14
-
[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) - Passive Filter Design to Mitigate Dead-Time Effects in Three-Level T-Type NPC Transformerless PV Inverters Modulated with Zero CMV PWM
摘要： Common-mode voltage (CMV) can cause common-mode (CM) current in transformerless PV inverters. In practice, large CM choke is usually required to suppress the CM current. Alternatively, zero common-mode voltage (ZCMV) modulation can be applied to eliminate the CMV. But in practical applications, CMV spikes are inevitable due to the dead-time effect. Such dead-time effect can be mitigated by special PWM sequence design, however, at the expense of increasing switching losses. In this paper, our study addresses this issue by using the DC neutral-point connected LCL (NC-LCL) filter. As the differential-mode (DM) output quality is undermined with ZCMV PWM, the LCL filter parameters must be carefully designed, where both CM and DM filters need to be considered. In addition, filter design for conventional phase disposition (PD) modulation is also included as a comparison. Both simulation results and experimental results are provided for verification.
关键词： Photovoltaic (PV) solar inverter,LCL filter design,Phase disposition modulation,T-type 3L-NPC (PD) inverter,Zero CMV modulation
更新于2025-09-04 15:30:14