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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - System Level Assessment of the Impact of High Penetration of PV Inverters with Grid Support Capability on Distribution Networks
摘要： Power systems simulations using PSCAD have been performed to evaluate the impact to the distribution grid of high photovoltaic (PV) penetration. Voltage regulation at load nodes, feeder short-circuit currents and power losses have been analyzed for penetration level up to 60% and compared with a baseline case referring to as no PV. Results show that high PV penetration impacts residential area and non-residential area networks differently. Also, depending on the grid strength, the performance of the network is different. PV micro-inverters, in some cases, can prevent voltage excursion beyond tolerance limits however, they are more effective for power losses reduction. Overall, up to 15% in energy losses can be saved at very high penetration levels. Regarding the short-circuit levels no adjustment in the network infrastructures is required as the PV systems will have inconsequential contribution in feeder short-circuit currents.
关键词： power distribution,Power conversion,Photovoltaic power systems
更新于2025-09-23 15:21:01
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Automated formal verification of stand-alone solar photovoltaic systems
摘要： With declining costs and increasing performance, the deployment of renewable energy systems is growing faster. In 2017, for the first time, the number of people without access to electricity dropped down below 1 billion, but trends on energy access likewise fall short of global goals. Particular attention is given to stand-alone solar photovoltaic systems in rural areas or where grid extension is unfeasible. Tools to evaluate electrification projects are available, but they are based on simulations that do not cover all aspects of the design-space. Automated verification using model checking has proven to be an effective technique to validate complex (state transition) systems. This paper marks the first application of software model checking to formally verify the design of a stand-alone solar photovoltaic system, including solar panel, charge controller, battery, inverter, and electric load. Our main focus is on the project validation to be carried out just after the system sizing, i.e., prior to buying equipment and deployment, as a safe approach to ensure the intended behavior. Five case studies were used to evaluate this proposed approach and to compare that with specialized simulation tool. Different verification tools were evaluated to compare performance and soundness among automated verifiers. The results reported by our automated verification method and by the simulation tool were compared with data collected from dwellers of the deployed cases, thereby showing the effectiveness of our approach, where specific conditions that lead to failures in a solar photovoltaic system are only detailed by the automated verification method.
关键词： Model checking,Formal verification,Photovoltaic power systems
更新于2025-09-19 17:13:59
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[IEEE 2018 14th International Conference on Power Electronics (CIEP) - Cholula, Puebla, Mexico (2018.10.24-2018.10.26)] 2018 14th International Conference on Power Electronics (CIEP) - DC-AC-AC Converter for PV Plant in Medium Voltage Grid-Connected Systems
摘要： Large-scale PV plants (hundreds of MW) are a reality and are being used to generate high-power levels in medium-voltage (MV) utilities. To achieve this goal, some new power electronics systems based on medium-frequency AC-links (MFAC) and multilevel output configurations have been proposed to interfacing with the MV utility. Most of these systems rectify the MFAC voltage, generating a DC bus and then invert the DC voltage to generate a line frequency AC voltage. This paper presents a three-phase cascaded multilevel converter topology with reduced-energy conversion stage and multiples AC medium-frequency (MF) links. The proposed converter is composed by modules connected in cascaded. Each module has three conversion stages: input converter (DC-AC), isolation stage (medium-frequency transformer) and output converter (AC-AC). In order to validate the proposed topology simulations of a 100 kW system are performed, taking into account balanced and unbalanced DC source cases. The proposed system is validated through a 1.5 kW single-phase five-level laboratory prototype.
关键词： AC-links,medium-frequency magnetic link,photovoltaic power systems
更新于2025-09-04 15:30:14