- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 IEEE Power & Energy Society General Meeting (PESGM) - Portland, OR, USA (2018.8.5-2018.8.10)] 2018 IEEE Power & Energy Society General Meeting (PESGM) - Study of Impact of Cloud Distribution on Multiple Interconnected Solar PV Plants Generation and System Strength
摘要： Dependence of solar power generation on solar irradiance results in sudden and dramatic variations in power generation following significant changes in cloud distribution over a solar PV plant. Currently, this phenomenon is being one of the most challenging issues in resource planning and maintaining the reliability of modern power grids with high penetration of solar power. The dramatic variation of solar power generation has a direct impact on system strength at the Points of Interconnection (POIs). Hence, the power quality of the system is compromised, especially because solar PV plants are usually interconnected to distribution systems and near load zones. In this paper, an Artificial Neural Network (ANN) based approach is developed to forecast the clouds distribution for the estimation of sudden and dramatic variations in the solar irradiance. This estimate is used to evaluate the system strength in terms of voltage stability at each POI. We apply newly developed methodology to measure the system strength known as Site-Dependent Short Circuit Ratio (SDSCR), which provides more accurate results of system strength evaluation. The validity and effectiveness of the developed approach is confirmed through comparing its results versus the cloud distribution data provided by weather satellites.
关键词： Artificial neural network,renewable energy,system strength,voltage stability,short circuit ratio
更新于2025-09-23 15:22:29
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Short-term Voltage Stability Enhancement in Residential Grid with High Penetration of Rooftop PV units
摘要： Short-term voltage instability (STVI) imposes a severe threat to modern distribution networks (DNs) where a large number of intermittent distributed generator (DG) units, like rooftop photovoltaic (PV), is being integrated. Consequently, most of the international standards have been revised by incorporating the requirement of dynamic voltage support (DVS) through DG units, which is a promising approach to alleviate the STVI. In this paper, a novel DVS strategy is proposed to improve the short-term voltage stability (STVS) in residential grids. In comparison with other DVS strategies, the proposed DVS scheme maximizes the active power support from PV units following a contingency utilizing maximum allowable current of the PV inverters. Moreover, the inverter design margin is taken into account in designing the proposed scheme to limit the injected grid current within maximum allowable inverter current. The impact of inverter design margin on the STVS is explained, and the effectiveness of the proposed strategy compared with conventional DVS is demonstrated. The feasibility of the DVS control strategies in practical application is studied. Several case studies are carried out on benchmark IEEE 4 bus and IEEE 13 node test feeder systems, and finally on a ring-type DN. The results show that the proposed DVS scheme is feasible, and achieved superior performance compared to the other strategies. Furthermore, it has been shown that implementation of the proposed DVS scheme can avoid the installation of an expensive 1200 kVA D-STATCOM for STVS improvement in the target system.
关键词： Distributed generators,fault induced delayed voltage recovery,low voltage ride-through,dynamic voltage support,short-term voltage stability,distribution system
更新于2025-09-23 15:21:01
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Three-layer voltage/var control strategy for PV cluster considering steady-state voltage stability
摘要： Different from the distributed photovoltaic (PV) system, large-scale PV cluster is regarded as a weakly connected sending-end system, encountering severe voltage issues. This paper proposes a three-layer voltage/var control (VVC) strategy for the coordination of VVC devices in PV cluster, which considers not only voltage deviation, but also steady-state voltage stability (SVS) of the system. The central approaches are adopted into the former two layers. In the first layer, capacitor banks and on-load tap changer are scheduled based on 30-min interval PV active power forecast. In the second layer, PV inverters and static synchronous compensator (STATCOM) are scheduled based on 10-min interval PV active power forecast. Considering computation effort and communication delay, in the third layer, the PV inverters and STATCOM continue to respond to real-time PV active power via the local approach. For improving the application performance of the centralized approaches, model prediction control is applied in the first control layer for enhancing robustness of the control. The sensitivity analysis is used for reducing optimization time in the second layer. Simulation results indicate that the proposed VVC strategy is effective for PV cluster to ensure the voltage within the safe range and improve SVS of the whole PV cluster.
关键词： Photovoltaic cluster,Voltage/var control,Voltage deviation,Steady-state voltage stability
更新于2025-09-19 17:15:36
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Optimized reactive power support strategy for photovoltaic inverter to intensify the dynamic voltage stability of islanded microgrid
摘要： This study presents an innovative and optimized reactive power support (ORPS) strategy for photovoltaic (PV) inverters to improve the dynamic voltage stability (DVS) of islanded microgrid (MG) with induction motor (IM) load. On the occurrence of the fault, voltage instability (VI) happens due to the low-inertia IM load and poor ride through capability of PV inverters of MG. Supplement of optimal RPS promptly, without exceeding the rated current value of the inverter, is aimed at the proposed control, to maintain DVS during severe voltage downfall as a result of a fault. Once the profiled voltage value is restored and the necessity of RPS is fulfilled, the PV inverter returns to its prefault power production combination. The detailed model of an inverter-based islanded MG with IM load is built to examine the DVS, and the theoretical analysis and technical discussion are conducted. A comparison between the conventional and proposed strategies is carried out. From the demonstrated results, employing the proposed ORPS control can provide RPS effectively and helps to improve the DVS. This proposed strategy can also provide an equivalent service as an expensive 610-kVA dynamic volt-ampere reactive support device (ie, D-STATCOM) in the studied MG.
关键词： PV inverter,dynamic voltage stability,reactive power support strategy,islanded MG
更新于2025-09-19 17:13:59
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Irreversible Photobleaching of BAC-Si in Bi/Er Co-Doped Optical Fiber under 830 nm Pumping
摘要： A novel empirical data analysis methodology based on the random matrix theory (RMT) and time series analysis is proposed for the power systems. Among the ongoing research studies of big data in the power system applications, there is a strong necessity for new mathematical tools that describe and analyze big data. This paper used RMT to model the empirical data which also treated as a time series. The proposed method extends traditional RMT for applications in a non-Gaussian distribution environment. Three case studies, i.e., power equipment condition monitoring, voltage stability analysis and low-frequency oscillation detection, illustrate the potential application value of our proposed method for multi-source heterogeneous data analysis, sensitive spot awareness and fast signal detection under an unknown noise pattern. The results showed that the empirical data from a power system modeled following RMT and in a time series have high sensitivity to dynamically characterized system states as well as observability and efficiency in system analysis compared with conventional equation-based methods.
关键词： low frequency oscillation,non-Gaussian,static voltage stability,Random matrix theory,time series analysis,data mining,condition monitoring
更新于2025-09-19 17:13:59
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[IEEE 2018 Australasian Universities Power Engineering Conference (AUPEC) - Auckland, New Zealand (2018.11.27-2018.11.30)] 2018 Australasian Universities Power Engineering Conference (AUPEC) - Location and Sizing of Distributed Generation Photovoltaic (DGPV) via Multi-Objective Pareto Algorithm
摘要： This paper proposes a new multi-objective technique to solve the problem of optimal location and sizing of Distributed Generation Photovoltaic system (DGPV) transmission network. The technique: Multi-objective Chaotic Mutation Immune Evolutionary Programming (MOCMIEP) was developed based on Pareto optimality to solve the DGPV location and sizing problem. The proposed technique determines the optimal location and sizing of DGPV, therefore will minimize the multiple objective functions, namely the active power losses and Fast Voltage Stability Index (FVSI) simultaneously. The method was tested on IEEE 118-Bus Reliability Test System (RTS). The results revealed that the proposed technique had the ability to acquire a set of Pareto solutions for the decision maker to choose depending on the system priorities.
关键词： Pareto optimal,Multi-objective,optimal,Distributed Generation Photovoltaic (DGPV),Fast Voltage Stability Index (FVSI)
更新于2025-09-16 10:30:52
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Study of Voltage Stability Due to Shading Effects on Photovoltaic Penetration in PKMT Distribution System
摘要： PV output power is firmly influenced by temperature and solar irradiation that fall on the surface of the PV modules. Shading which cross-wising the surface of PV modules is major factor that prevails the degradation of its performance. The shading in PV arrays is caused by the presence of cloud, dust, fog, trees, the shadow near buildings, and so on. As the result of the shading effect, the voltage and current outputs fluctuate which would in turn reducing the efficiency of the PV output. The voltage and current of PV solar cells will drop from partial shading effect experiment which consists of 20%, 40%, 60%, 80%, and 100% shading area. This paper shows the effect of PV system over the voltage stability by variating the shading conditions using simulation by ETAP software 12.6.0.
关键词： Voltage Stability,Photovoltaic,Shading Effects,ETAP software
更新于2025-09-16 10:30:52
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Grid Connected-Photovoltaic System (GC-PVS): Issues and Challenges
摘要： Smart grid is the key technology for an effective utilization of the Renewable Energy Sources (RES). The utilization of RES for the generation of electricity is increasingly gaining interest of researchers during the last decades. The main reason behind this is global incentivization, the increasing price of petroleum products, climate issues and deregulations in the energy market. As the Government of India, (MNRE i.e. Ministry of New & Renewable Energy) is targeting to generate 20000 MW power through grid-connected solar PVS by the year 2022 therefore, the main focus in this paper has been presented on power generation through grid-connected PVS. The emerging smart grid technology has enabled the grid-connected PVS as an evolving process in today’s world for electrical power generation. However, apart from so many advantages, there are several issues and challenges associated with the integration of PVS to the electric utility grid hence, the investigation to find out available possible solutions to overcome these issues becomes essential in order to enhance the performance of grid-connected PVS. The most severe constraint associated with this emerging technology is it high penetration level. If during low load conditions there is some mismatch found between the real power output and the load profile characteristics of PVS then it may result into large reverse power flow, high power losses or severe voltage violation. In this paper, several issues and challenges associated with the integration of solar PVS with the electric utility grid are presented.
关键词： Renewable Energy Sources,Grid Connected-Photovoltaic System,harmonics,voltage stability,RES,frequency stability,smart grid,GC-PVS
更新于2025-09-11 14:15:04
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Restoration of stable voltage in an isolated hybrid solar power system with combined JAYA-DE algorithm
摘要： This work discusses the implementation of JAYA-DE algorithm with Static Var Compensator for optimum voltage control through Reactive Power compensation inside solar based hybrid power system.The stability aspect of isolated solar based hybrid power system is enhanced through compensation of the reactive power by optimized SVC and are further analyzed with different stability criterion. The dynamic performance of the new hybrid technique under intermittent wind power input and variable load show superiority over the conventional control methods.
关键词： Reactive power compensation,JAYA optimization voltage stability,Differential evolution algorithm,HSPS
更新于2025-09-10 09:29:36
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[IEEE 2018 2nd International Conference on Smart Grid and Smart Cities (ICSGSC) - Kuala Lumpur, Malaysia (2018.8.12-2018.8.14)] 2018 2nd International Conference on Smart Grid and Smart Cities (ICSGSC) - Research of Voltage Stability in 10 kV Distribution Networks during Integrating the 2 MW Solar Power Plant
摘要： In Kazakhstan, a number of measures have been taken to stimulate the introduction of renewable energy, one of which is solar energy [1], [2]. Until 2025, the introduction of solar power plants (SPP) will be 650 MW. When integrating solar panels with inverter coupling into electrical networks, a number of difficulties arise related to the stability of the voltage in transient modes. The converter voltage inverters do not have feedback from the voltage of the external power supply system. Power generation of SPP, as a rule, is only a function of solar radiation and does not depend on the network parameters [3]. In this regard, the actual issue is the introduction of adaptive controllers for controlling inverters, depending on the change in the mode parameters [4], [5]. In this paper, we present the results of studies on the modeling of transient regimes using the example of the SPP with an installed capacity of 2 MW. The virtual model of the PSCad analyzed the stability of the voltage in the event of a short circuit on the 10 kV bus, algorithms and mechanisms for using the intelligent controller for controlling the photovoltaic system were developed.
关键词： solar power plant integration,short-circuit current,transient processes,voltage stability,distribution networks
更新于2025-09-09 09:28:46