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Data-driven uncertainty analysis of distribution networks including photovoltaic generation
摘要： This paper investigates residential distribution networks with uncertain loads and photovoltaic distributed generation. An original probabilistic modeling of consumer demand and photovoltaic generation is presented that is based on the analysis of large set of data measurements. It is shown how photovoltaic generation is described by complex non-standard distributions that can be described only numerically. Probabilistic analysis is performed using an enhanced version of the Polynomial Chaos technique that exploits a proper set of polynomial basis functions. It is described how such functions can be generated from the numerically available data. Compared to other approximate methods for probabilistic analysis, the novel technique has the advantages of modeling accurately truly nonlinear problems and of directly providing the detailed Probability Density Function of relevant observable quantities affecting the quality of service. Compared to standard Monte Carlo method, the proposed technique introduces a simulation speedup that depends on the number of random parameters. Numerical applications to radial and weakly meshed networks are presented where the method is employed to explore overvoltage, unbalance factor and power loss, as a function of photovoltaic penetration and/or network configuration.
关键词： Photovoltaic generation,Data-driven models,Polynomial chaos,Unbalanced distribution networks,Probabilistic load flow,Uncertainty Analysis
更新于2025-09-23 15:21:01
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An Improved Frequency Measurement Method from the Digital PLL Structure for Single-Phase Grid-Connected PV Applications
摘要： The Phase Locked Loop (PLL) technique has been studied to obtain the phase and frequency information in grid-connected distributed generations for the sake of synchronizing the grid voltage and the inverter output current. In particular, the line frequency information, such as the anti-islanding function, is very important for the grid connection requirement. This paper presents a novel frequency measurement method from the digital PLL control structure for single-phase grid-connected PV applications. The conventional PLL controller uses the phase information to calculate the frequency of PV inverter output voltage after every line cycle and has shown a relatively low accuracy. This paper uses the angular frequency to directly measure the frequency after every line cycle. To verify the validity of the proposed method compared with the conventional method, a simulation was conducted. According to the simulation results, the measurement error of the proposed method is 80 times lower than the conventional one.
关键词： phase locked loop,frequency measurement,photovoltaic generation,grid-connection,PV inverter
更新于2025-09-23 15:21:01
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Optimal planning of distributed photovoltaic generation for the traction power supply system of high-speed railway
摘要： The ever-increasing electricity price and energy consumption in high-speed railway industry push railway companies to seek a promising way to realize their sustainable developments. Making full use of the solar resource along with high-speed railways can be a potential solution to cut the electricity bill, bring more profit to railway companies and realize the decarbonization of high-speed railway industry. This paper studies the optimal planning of distributed photovoltaic generation (DPVG) and energy storage system (ESS) for the traction power supply system (TPSS) of high-speed railway. A quantitative method is proposed to study the time and space characteristics of photovoltaic generation and electricity demand of high-speed trains. An integrated cost-benefit analysis framework is developed to evaluate the effect of DPVG and ESS on the economy of TPSS. To derive the optimal planning scheme and energy management strategy of DPVG and ESS, a mathematical programming model with the objective of minimizing the total cost is proposed to seek the most economical solution. A hybrid global optimal solution approach is developed to solve the model. A real-world case of Beijing-Baoding high-speed railway in China is used to illustrate the capability and characteristics of the proposed model. The computational results show that DPVG is able to supply 48.5% electricity demand of high-speed trains. The integration of DPVG and ESS can help railway company save 4.5 billion CNY each year in Beijing-Baoding high-speed railway. This paper demonstrates the potential and applicability of DPVG and ESS in high-speed railway industry.
关键词： Energy storage system,Traction power supply system,Photovoltaic generation,High-speed railway
更新于2025-09-23 15:21:01
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Accurate Sizing of Residential Stand-Alone Photovoltaic Systems Considering System Reliability
摘要： In rural areas or in isolated communities in developing countries it is increasingly common to install micro-renewable sources, such as photovoltaic (PV) systems, by residential consumers without access to the utility distribution network. The reliability of the supply provided by these stand-alone generators is a key issue when designing the PV system. The proper system sizing for a minimum level of reliability avoids unacceptable continuity of supply (undersized system) and unnecessary costs (oversized system). This paper presents a method for the accurate sizing of stand-alone photovoltaic (SAPV) residential generation systems for a pre-established reliability level. The proposed method is based on the application of a sequential random Monte Carlo simulation to the system model. Uncertainties of solar radiation, energy demand, and component failures are simultaneously considered. The results of the case study facilitate the sizing of the main energy elements (solar panels and battery) depending on the required level of reliability, taking into account the uncertainties that affect this type of facility. The analysis carried out demonstrates that deterministic designs of SAPV systems based on average demand and radiation values or the average number of consecutive cloudy days can lead to inadequate levels of continuity of supply.
关键词： photovoltaic generation,battery storage,renewable energy,Monte Carlo Simulation,reliability evaluation
更新于2025-09-19 17:13:59
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Sunny with a chance of curtailment: Operating the U.S. grid with very high levels of solar photovoltaics
摘要： With rapid declines in solar photovoltaic (PV) and energy storage costs, futures with PV penetrations approaching or exceeding 50% of total annual U.S. generation are becoming conceivable. The operational merits of such a national-scale system have not been evaluated sufficiently. Here, we analyze in detail the operational impacts of a future U.S. power system with very high annual levels of PV (>50%) with storage. We show that load and operating reserve requirements can be met for all hours while considering key generator operational constraints. Storage plays an active role in maintaining the balance of supply and demand during sunset hours. Under the highest PV penetration scenario, hours with >90% PV penetration are relatively common, which require rapid transitions between predominately conventional synchronous generation and mostly inverter-based generation. We observe hours with almost 400 GW (over 40%) of economic curtailment and frequent (up to 36%) hours with very low energy prices.
关键词： Photovoltaic generation,energy storage,net load,renewables,energy prices,solar energy,thermal cycling,curtailment,production cost modeling,ramping
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 2nd International Conference on Knowledge Innovation and Invention (ICKII) - Seoul, Korea (South) (2019.7.12-2019.7.15)] 2019 IEEE 2nd International Conference on Knowledge Innovation and Invention (ICKII) - Improved Hybrid Simulated Annealing and Particle Swarm Optimization for Maximum Power Point Tracking
摘要： This paper proposes an Improved Hybrid Simulated Annealing and Particle Swarm Optimization (ISA-PSO) which is applied in the maximum power point tracking (MPPT) of photovoltaic generation system. ISA-PSO combined with Simulated Annealing (SA) and Particle Swarm Optimization (PSO), using SA's escaping mechanism to improve the shortcomings of PSO slow convergence and easy to fall into the local optimal solution. The overall search ability is increase and the tracking time is reduced. This paper uses MATLAB to simulate MPPT. Through the simulation comparison with PSO, SA, SA-PSO, it can be verified that ISA-PSO scheme is better than other algorithms. In the temperature changing simulation, the efficiency is 97.03% and the tracking speed is reduced to 2.31 second. In the illumination changing simulation, the efficiency is 97.12% and the tracking speed is reduced to 2.27 second.
关键词： Photovoltaic Generation System,Maximum Power Point Tracking,Improved Hybrid Simulated Annealing and Particle Swarm Optimization
更新于2025-09-19 17:13:59
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A state-of-the-art review on conventional, soft computing, and hybrid techniques for shading mitigation in photovoltaic applications
摘要： This article intends to present a compendious review to extract maximum power in solar photovoltaic (PV) systems under varying environmental conditions and partial shading conditions by enumerating various circuit-based topologies and different state-of-the-art maximum power point techniques (MPPT). Partial shading reduces the overall efficiency of the PV system; therefore techniques that are dealing with partial shading play an important part in the power conditioning unit of all PV system connected to the stand-alone mode or grid mode. Various circuit-based topologies and various algorithms have been broadly discussed till date. As every algorithm is associated with its own merits and demerit, hence an extensive literature survey is required while planning for PV generating station under normal and partial shading condition. In this article, a comprehensive review of shading mitigation using different topologies has been done. The article on shading mitigation is broadly divided into two major groups. The first group includes all major circuit-based topologies and the second group includes MPPT based techniques, which has been further classified into modified conventional techniques, soft computing techniques, and hybrid techniques. This comprehensive review presents an assessment of all techniques according to parameters like converter used, tracking speed, complexity, efficiency, number of sensors under partial shading condition would certainly provide a single platform to carry forward their research in solar PV application.
关键词： global maximum power point,pulse width modulation,partial shading condition,photovoltaic generation System,hybrid optimization techniques,artificial intelligence
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE International Conference on Architecture, Construction, Environment and Hydraulics (ICACEH) - Xiamen, China (2019.12.20-2019.12.22)] 2019 IEEE International Conference on Architecture, Construction, Environment and Hydraulics (ICACEH) - Optimal Decision of Photovoltaic Generation Injection Point in Unbalanced Distribution System
摘要： In this paper, the photovoltaic generation was considered as the only one renewable power source to supply system load of a chemical factory directly. An improved genetic algorithm was applied to determine the optimal location and capacity of newly constructed PV generation systems by considering system loss minimization and improving voltage unbalance through simulation with solar power injected.
关键词： Optimal Feed-in Location,Renewable Energy,Photovoltaic Generation,Genetic Algorithm
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Control of Split-Source Cascaded Multilevel Inverter (SS-CMI) for Single-Phase Grid-Connected Photovoltaic Systems
摘要： The exponential growth of distributed generation has driven the development of new technologies for grid connection. Among them, the converters and control strategies are constantly improved in order to guarantee high efficiency, good dynamic performance and quality of output harmonic content. The Split-Source Inverter (SSI) was proposed as an alternative for the Impedance-Source Inverter (ZSI). Furthermore, several multilevel topologies have been originated from the ZSI including the Cascaded Multilevel Inverter (CMI), however, the CMI has not been investigated for the SSI. Therefore, this paper proposes a control strategy for the SS-CMI, due its interesting characteristics, such as low harmonic content and reduced voltage stress across the switches. The whole control system includes individual Maximum Power Point Tracking (MPPT) for each photovoltaic (PV) array and controllers for grid current and dc-bus voltages. Simulation results based on a five-level system are performed aiming to explore the response of the system to forced variations of irradiance, temperature and a grid voltage swell.
关键词： Photovoltaic Generation Systems,Split Source Inverter,Cascaded Multilevel Inverter
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Impact Evaluation in Tap-Change Voltage Regulators within Photovoltaic Generation
摘要： Electricity distribution networks must be carefully evaluated in order to benefit from the insertion of distributed generators. Considering the insertion of photovoltaic systems, the continuous movement of clouds can produce variations of difficult predictability on the voltage levels and the power flow generated. Therefore, it is important to know methods to minimize such impacts, evaluating the iteration between generators and voltage regulators, so that the quality of electricity supply remains within the allowable range. The aim of this work is to investigate the performance of tap-on-load and tap changers (OLTC) using the IEEE 34 bus system. Thus, it was considered the presence of photovoltaic generators in IEEE 34 bus system, with different generation conditions, load characteristics (constant or variable) and actuation adjustment time of the regulating equipment. The use of analyzes known as Quasi-Static Time-Series for the electrical simulations were performed the Open Distribution System Simulator (OpenDSS) software.
关键词： On Load Tap Changer,Voltage Levels,Photovoltaic Generation
更新于2025-09-16 10:30:52