Sheikhipour Sepehr, Ghadimi Ali Asghar, Mirzaei Amin
Department of Electrical Engineering, Faculty of Engineering, Arak University, Arak, Iran.
ISA Trans. 2022 Sep;128(Pt A):606-623. doi: 10.1016/j.isatra.2021.10.001. Epub 2021 Oct 12.
One of the most important part of a stand-alone photovoltaic system is energy management. This part uses several sensors to measure solar radiations, load power and battery energy to determine operation of the system components. Reduction the number of sensors and optimization of energy management system are two key steps to improve the efficiency and reliability of the system without additional cost. Hence, in this paper, a comprehensive energy management algorithm along with a complementary algorithm to estimate radiation under uniform and partial shading conditions is proposed. According to the system state, the energy management algorithm commands to activate/ deactivate a part or entire of photovoltaic system which can increase the system lifetime and thus increase the system reliability. Another feature of the proposed algorithm is a new mode in the absence of radiation for parallelizing and sharing the battery's current to the load by unidirectional and bidirectional converters. Furthermore, a sensor-less complementary algorithm to determine the amount of radiation and also the partial shading condition is proposed. To prove the feasibility of the proposed algorithms, the system was simulated and constructed. The simulation and experimental results are found closely comparable and confirm the effectiveness of the proposed methods.
独立光伏系统最重要的部分之一是能量管理。这部分使用多个传感器来测量太阳辐射、负载功率和电池能量，以确定系统组件的运行情况。减少传感器数量和优化能量管理系统是在不增加成本的情况下提高系统效率和可靠性的两个关键步骤。因此，本文提出了一种综合能量管理算法以及一种用于在均匀和部分阴影条件下估计辐射的互补算法。根据系统状态，能量管理算法命令激活/停用光伏系统的一部分或全部，这可以延长系统寿命，从而提高系统可靠性。所提出算法的另一个特点是在无辐射情况下的一种新模式，通过单向和双向转换器将电池电流并行化并共享给负载。此外，还提出了一种无需传感器的互补算法来确定辐射量以及部分阴影条件。为了证明所提出算法的可行性，对系统进行了仿真和构建。仿真和实验结果非常可比，证实了所提方法的有效性。
