Abstract
Photovoltaic energy storage system is composed of photovoltaic power generation, energy storage battery, load and power grid, it has researched on different modes of bi-directional DC/AC converter, taking into account a variety of photovoltaic output fluctuations, energy storage battery charging and discharging management, load increasing and decreasing, etc. Aiming at the energy management strategy, using DC bus voltage fluctuation as the basis of energy layer mobilization, the power balance control based on regular control is proposed. Compared with the DC bus voltage level energy management, the power tracking accuracy is further improved and energy loss is reduced. Finally, through MATLAB/Simulink being in off/connected model and the charging/discharging model, the effectiveness of the energy control strategy was verified separately by simulation. The simulation results show that: the proposed control strategy can improve the power tracking accuracy and reduce the energy loss of the system; the proposed strategy guarantees the bidirectional exchange of system energy and maintains the power balance in the network, the DC bus voltage is stable, and the energy storage battery achieves smooth power output and peak load shifting.
Highlights
In the field of new energy power generation, such as photovoltaic power generation and wind power generation, there are volatility, intermittentness and randomness
The results show that the energy management strategy based on rule logic control reduces the tracking loss of photovoltaic output and load forecasting, and improves the power tracking accuracy
The light intensity rises to 1000W/m2 by 0.8s, the photovoltaic output is increased from the original 196kW to 498.9kW, the system working mode is switched from 5 to 1, the photovoltaic output is sufficient and the energy storage battery still has remaining power transmitted to the grid after working at the upper limit of charge In the whole process, the DC bus voltage is basically stable at about 715V
Summary
In the field of new energy power generation, such as photovoltaic power generation and wind power generation, there are volatility, intermittentness and randomness These unavoidable factors will cause output power fluctuations and bring non-negligible negative effects on the grid and load. Because it contains a variety of energy flow conditions, how to achieve different units Inter-energy management and coordinated control are a major research focus. In response to this hot spot, a lot of research has been done in related literature [4,5,6]. The charging and discharging effect of the energy storage battery realizes smooth photovoltaic output power fluctuations, so that the power of photovoltaic power input to the grid remains stable for a certain period of time, realizes the function of peak shaving and valley filling, and reduces the impact of intermittent power output fluctuations on power quality
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