Kamagaté Yaya, Shah Heli Amit
Electrical Engineering Department, Parul University, Vadodara, India.
Robotics and Automation Engineering Department, Parul University, Vadodara, India.
Sci Rep. 2024 Aug 31;14(1):20294. doi: 10.1038/s41598-024-70599-w.
Microgrids offer an optimistic solution for delivering electricity to remote regions and incorporating renewable energy into existing power systems. However, the energy balance between generation and consumption remains a significant challenge in microgrid setups. This research presents an adaptive energy management approach for grid-interactive microgrids. The DC microgrid is established by combining solar PV with a battery-supercapacitor (SC) hybrid energy storage system (HESS). The proposed approach integrates the frequency separation strategy with a rule-based algorithm to ensure optimal power sharing among sources while maintaining the safe operation of storage units. Specifically, the battery meets steady-state energy demands, the SC addresses transient power requirements, and the grid support is tailored to system needs. The method employs the dq reference frame technique to control the grid inverter (VSC). The key merits include efficient power allocation, fast regulation of the DC link voltage irrespective of load or generation variations, seamless transition between scenarios, and introduction of a straightforward battery state of charge (SOC)-based coefficient for allocating power between the battery and the grid while enhancing the power quality within the grid. Moreover, safety measures prevent the SC from overcharging, the battery from high current, overcharging, and deep discharging, potentially extending their lifespan. Validation and implementation of the method are conducted using MATLAB/Simulink.
微电网为向偏远地区供电以及将可再生能源并入现有电力系统提供了一个乐观的解决方案。然而，在微电网设置中，发电与用电之间的能量平衡仍然是一项重大挑战。本研究提出了一种用于与电网交互的微电网的自适应能量管理方法。直流微电网通过将太阳能光伏与电池 - 超级电容器（SC）混合储能系统（HESS）相结合来建立。所提出的方法将频率分离策略与基于规则的算法相结合，以确保各电源之间的最优功率分配，同时维持储能单元的安全运行。具体而言，电池满足稳态能量需求，超级电容器满足瞬态功率需求，并且电网支持根据系统需求进行调整。该方法采用dq参考系技术来控制电网逆变器（VSC）。其主要优点包括高效的功率分配、无论负载或发电变化如何都能快速调节直流母线电压、不同场景之间的无缝切换，以及引入了一个基于简单电池荷电状态（SOC）的系数来在电池和电网之间分配功率，同时提高电网内的电能质量。此外，安全措施可防止超级电容器过度充电、电池出现大电流、过度充电和深度放电，从而可能延长它们的使用寿命。使用MATLAB/Simulink对该方法进行了验证和实现。
