Studies on the Grid-Connected Characteristics about Large-Scale Photovoltaic Power Station in Weak Grid Systems

2011 ◽  
Vol 347-353 ◽  
pp. 639-646
Author(s):  
Hui Jiang ◽  
Zhi Wei Li ◽  
Xin Zheng
Keyword(s):  
Theoretical Basis ◽  
Large Scale ◽  
Transient Stability ◽  
Energy Strategy ◽  
Power Station ◽  
Grid Systems ◽  
Weak Grid ◽  
Good Consistency ◽  
New Energy ◽  
The Stability

This paper made some researches of modeling on the systems of the large-scale photovoltaic（PV） power station, and established the PV model, the rectifier and inverter circuits and so on. Using MATLAB and PSASP, simulation and analysis of grid-connected characteristics about the large-scale PV power station in weak grid systems were carried out, focusing on the transient stability in the fault condition of the line-side and the power quality. These two simulation results had good consistency, which demonstrated the accuracy of the large-scale PV power station model in this paper and the analysis of its grid-connected characteristics. The conclusion of this paper will provide some theoretical basis of improving the stability of grid-connected and reducing the harmonic current in weak grid systems, and will also provide some theoretical basis and the guide of grid-connected for the new energy strategy of our country in the future.

Studies on the Grid-Connected Characteristics about Large-Scale Photovoltaic Power Bases

2013 ◽  
Vol 291-294 ◽  
pp. 152-157
Author(s):  
Hui Jiang ◽  
Xin Zheng ◽  
Xin Quan Wu ◽  
Zhi Wei Li
Keyword(s):  
Theoretical Basis ◽  
Power Flow ◽  
Large Scale ◽  
Transient Stability ◽  
Power Bases ◽  
Generation System ◽  
Power Station ◽  
Grid Connection ◽  
New Energy ◽  
The Stability

This paper made some researches of modeling on the systems of the photovoltaic（PV） power station, and analyzing the photovoltaic grid-connected generation system. Using MATLAB and PSASP, simulation and analysis of grid-connected characteristics about the large-scale PV power bases were carried out, focusing on the influence of the power flow after the grid connection of large scale PV power bases, the transient stability in the fault condition of the line-side and in the condition of the light disturbance. Specific measures are presented to solve problems. The conclusion of this paper will provide some theoretical basis of improving the stability of grid-connected of the large-scale PV power bases and will also provide some theoretical basis and the guide of grid-connected for the new energy strategy of our country in the future.

scholarly journals Research on voltage stability and control strategy of power system considering grid connected charging of electric vehicles

2021 ◽  
Vol 2121 (1) ◽  
pp. 012020
Author(s):  
Weidong Fang ◽  
Hao Lv ◽  
Yiting Jiang ◽  
Lingzhi Li
Keyword(s):  
Electric Vehicles ◽  
Energy Demand ◽  
Large Scale ◽  
Voltage Stability ◽  
Power Grid ◽  
Stable Operation ◽  
Charging Station ◽  
New Energy ◽  
The Stability ◽  
The Impact

Abstract The development of new energy vehicles is an important measure to deal with the growing energy demand and climate change. Especially in recent years, with the support of national policies and the maturity of electric vehicles(EVs) related technologies, the number of EVs has increased explosively, and the situation is very good. However, it also means that a large number of charging loads will be connected to the power grid, which will put great pressure on the safe and stable operation of the power grid. Although there have been many studies on the impact of EVs integration into modern power grid, most of the EVs load models are based on probability function and lack accuracy. Therefore, starting with the actual operation data of EVs charging station, this paper studies the influence of a large number of EVs charging loads on the static voltage stability of power grid. It is found that the charging load of large-scale EVs is added to the power grid, which significantly reduces the stability of power grid voltage, especially at the place connected to the EVs load and far away from the balance node. In addition, when the charging station adopts the time-of-use(TOU) price strategy, it can effectively improve the voltage stability of the whole network.

The Summary of Chaos Theory in PV System

2013 ◽  
Vol 811 ◽  
pp. 698-701
Author(s):  
You Jie Ma ◽  
Ling Ma ◽  
Xue Song Zhou
Keyword(s):  
Chaos Theory ◽  
Large Scale ◽  
Energy Research ◽  
Pv System ◽  
Photovoltaic Power ◽  
New Energy ◽  
Large Scale Grid ◽  
The Stability ◽  
Scale Grid ◽  
Energy Shortage

In the situation that the traditional energy shortage and environmental pollution problems have become increasingly grim, the new energy research has been widespread concern at home and abroad. Represented by distributed photovoltaic power is gradually from a stand alone system toward large-scale grid direction. However, the PV system chaotic phenomena threaten the stability of the system.

scholarly journals Integrated Transient Stability Analysis with Multi-Large-Scale Solar Photovoltaic in Distribution Network

2020 ◽  
Vol 30.8 (147) ◽  
pp. 40-45
Author(s):  
Ngoc Thien Nam Tran ◽  
◽  
Hong-Tzer Yang ◽  
Minh Quan Duong ◽  
Keyword(s):  
Large Scale ◽  
Transient Stability ◽  
Renewable Energy Sources ◽  
Distribution Grid ◽  
Angle Variation ◽  
Actual Distribution ◽  
Return On Capital ◽  
National Power ◽  
The Government ◽  
The Stability

Using renewable energy sources (RES) to face energy shortages in the context of rising load demand is a central issue in national power system planning. With low investment rates, rapid return on capital as well as many incentives from the government, solar energy is being more invested than other types of RES, as it can be seen as a rooftop and large-scale Photovoltaic (LSPV) system. However, if the LSPV penetrates too much into the grid, it will weaken the stability of the system, especially when a fault occurs. This paper aims to evaluate the transient stability of an actual distribution grid (DG) under different penetration levels of LSPV by ETAP software. The frequency and voltage responses will be presented in the results along with the rotor angle variation of a conventional generator located near the LSPV.

Study on Stability Improvement of Wind Farm Integrated to Weak Grid by VSC-HVDC

2013 ◽  
Vol 860-863 ◽  
pp. 267-270
Author(s):  
Xiao Yan Bian ◽  
Li Jun Hong ◽  
Yang Fu
Keyword(s):  
Large Scale ◽  
Wind Farm ◽  
Transient Stability ◽  
Wind Farms ◽  
Active Power ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Control Loop ◽  
Weak Grid ◽  
Grid Side

Reactive and active power variation of large scale wind farms always lead to the instability of voltage and frequency. To solve this problem, this paper proposed a method of joining with frequency and voltage control loop of Voltage Source Converter HVDC (VSC-HVDC). Control loop of VSC-HVDC converter WFVSC (Wind Farm Side VSC) and GSVSC (Grid Side VSC) were detailed designed. By the frequency loop of WFSVSC, transient stability is greatly improved. Finally, based on the DIgSILENT/Power Factory simulation, the results show its validity and effectiveness.

Demand-side Energy Policy as an Alternative Energy Strategy for Pakistan

1986 ◽  
Vol 25 (4) ◽  
pp. 631-647
Author(s):  
Peter Pintz
Keyword(s):  
Energy Policy ◽  
Alternative Energy ◽  
High Growth ◽  
Energy Resources ◽  
Energy Strategy ◽  
General Development ◽  
Foreign Countries ◽  
The World ◽  
New Energy ◽  
Level Of Economic Development

After the first oil-price shock of 1973, a search for new energy policies was started all over the world. Changing one fundamental concept - that relating to the general development of energy supply and consumption - was, however, out of the question. The pre-1973 trend of development was maintained. The energy elasticities did not change. The old forecasts were still held to be valid and were considered now, as earlier, to be the objectives which a successful energy policy had to achieve. This was considered a prerequisite for high growth rates of GNP and improvements in living conditions, and energy consumption was regarded as an indicator of the level of economic development. Therefore, the focus was shifted to an enlargement of the supply of indigenous energy resources as a substitute for imported energy, so that dependence on foreign countries could be minimized.

scholarly journals Development and Characterization of Two Types of Surface Displayed Levansucrases for Levan Biosynthesis

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 757
Author(s):  
Huiyi Shang ◽  
Danni Yang ◽  
Dairong Qiao ◽  
Hui Xu ◽  
Yi Cao
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Molecular Weight ◽  
Large Scale ◽  
Surface Display ◽  
Yeast Surface Display ◽  
Fusion Partner ◽  
Whole Cell ◽  
Food Industries ◽  
Yeast Surface ◽  
The Stability

Levan has wide applications in chemical, cosmetic, pharmaceutical and food industries. The free levansucrase is usually used in the biosynthesis of levan, but the poor reusability and low stability of free levansucrase have limited its large-scale use. To address this problem, the surface-displayed levansucrase in Saccharomyces cerevisiae were generated and evaluated in this study. The levansucrase from Zymomonas mobilis was displayed on the cell surface of Saccharomyces cerevisiae EBY100 using a various yeast surface display platform. The N-terminal fusion partner is based on a-agglutinin, and the C-terminal one is Flo1p. The yield of levan produced by these two whole-cell biocatalysts reaches 26 g/L and 34 g/L in 24 h, respectively. Meanwhile, the stability of the surface-displayed levansucrases is significantly enhanced. After six reuses, these two biocatalysts retained over 50% and 60% of their initial activities, respectively. Furthermore, the molecular weight and polydispersity test of the products suggested that the whole-cell biocatalyst of levansucrase displayed by Flo1p has more potentials in the production of levan with low molecular weight which is critical in certain applications. In conclusion, our method not only enable the possibility to reuse the enzyme, but also improves the stability of the enzyme.

scholarly journals INTRACISTRONIC MAPPING OF ELECTROPHORETIC SITES IN DROSOPHILA MELANOGASTER: FIDELITY OF INFORMATION TRANSFER BY GENE CONVERSION

Genetics ◽  
1974 ◽  
Vol 76 (2) ◽  
pp. 289-299
Author(s):  
Margaret McCarron ◽  
William Gelbart ◽  
Arthur Chovnick
Keyword(s):  
Drosophila Melanogaster ◽  
Information Transfer ◽  
Large Scale ◽  
Genetic Basis ◽  
Xanthine Dehydrogenase ◽  
Specific Protein ◽  
Wild Type ◽  
Electrophoretic Variation ◽  
The Stability ◽  
Recombination Experiments

ABSTRACT A convenient method is described for the intracistronic mapping of genetic sites responsible for electrophoretic variation of a specific protein in Drosophila melanogaster. A number of wild-type isoalleles of the rosy locus have been isolated which are associated with the production of electrophoretically distinguishable xanthine dehydrogenases. Large-scale recombination experiments were carried out involving null enzyme mutants induced on electrophoretically distinct wild-type isoalleles, the genetic basis for which is followed as a nonselective marker in the cross. Additionally, a large-scale recombination experiment was carried out involving null enzyme rosy mutants induced on the same wild-type isoallele. Examination of the electrophoretic character of crossover and convertant products recovered from the latter experiment revealed that all exhibited the same parental electrophoretic character. In addition to documenting the stability of the xanthine dehydrogenase electrophoretic character, this observation argues against a special mutagenesis hypothesis to explain conversions resulting from allele recombination studies.

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