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Na Liu,Chengdong Wu,Cailian Gu 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.5
Photovoltaic power generation is clean, non-polluting, inexhaustible, but its characteristics of randomness, volatility and intermittent also produce its negative effects on power system economic, safe and reliable operation, which cannot be ignored. Storage battery in photovoltaic power generation system can not only absorb excess energy reserves, but also can stabilize the fluctuation, cut a peak to fill the valley and the stable voltage, it is very important and key part, At the same time, the energy storage capacity of the rational allocation of system not only for the photovoltaic power generation system of construction cost, also affects the performance and the service life of the system. This paper is based on the amount of solar radiation data of Liaoning area, proposed the hypothesis that PV fluctuation characteristics accord with normal distribution characteristics ,and fitted by normal distribution probability density function, verified the assumption of normal distribution, and proposed a selection strategy of energy storage power based on the normal distribution, Established mathematical model of battery energy storage capacity configuration, and regards the total power standard deviation, fluctuation of power capacity and power fluctuation rate as evaluation indicators to measure the effects of the long-term and short-term fluctuation of the storage battery on stabilizing fluctuation of photovoltaic power generation , through the examples and simulation proved that the model is correct and reasonable.
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Na Liu,Chengdong Wu,Cailian Gu 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.5
The charging and discharging control and management of the energy storage battery are the key links to influence the performance and the service life of the battery in photovoltaic system. According to the inherent characteristics of power terminal of photovoltaic power generation system, this paper designs a control operation mode of a paralleling and independent controlling structure, uses charging and discharging controlled strategy by time-sharing grouped , combines the constant current charging, pulse charge and floating charge trickle charge. The main features of the integrated control strategy method is capable of more efficient utilization intensity of solar radiation, more reasonable control of charging storage energy system. According to the improvement of the structural design of the existing project 100KW photovoltaic engineering power system, and observation and analysis about a large amount of data, the charging effect is obviously improved compared with the former system.
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