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Improving the Transient Response of Hybrid Energy Storage System for Voltage Stability in DC Microgrids Using an Autonomous Control Strategy

机译：利用自主控制策略改善DC微电网电压稳定性的混合储能系统的瞬态响应

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In renewable microgrid systems, energy storage system (ESS) plays an important role, as an energy buffer, to stabilize the system by compensating the demand-generation mismatch. Battery energy storage system serves as a decisive and critical component. However, due to low power density and consequently slow dynamic response the lifetime of BESS is observably reduced due to high current stress, specifically experienced during abrupt/transient power variations. Hence, hybridization with supercapacitor storage system is conferred. Additionally, the controllers designed for energy storage systems should substantially respond for compensating the transient requirement of the system. In this article, we propose a decoupled control strategy for batteries and supercapacitors based on k - Type compensators and a nonlinear PI controller (NPIC) respectively. The formulated control design is tested for voltage regulation in a standalone microgrid. Furthermore, a comparative analysis is presented with benchmark low-pass-filter (LPF) based controller. The results obtained shows the proposed control technique possess a faster response with improved voltage regulation capabilities. For the test system regulated at 48 V for various abrupt load-generation various case studies presented, the proposed methodology maintains a significantly reduced voltage deviation between 47 V - 51 V in contrast to 45 V - 56 V observed in the LPF methodology. Furthermore, the complexity is simpler in comparison to LPF based control strategy and a comparative obviation of additional sensing devices is achieved, that inherently reduces the detrimental effect on ESS response during transient condition.
机译：在可再生的微电网系统中，能量存储系统（ESS）通过补偿需求发电不匹配来稳定系统的重要作用。电池储能系统用作决定性和关键的组件。然而，由于低功率密度并且因此减慢动态响应，由于高电流应力，因此在突然/瞬态功率变化期间特别经历了寿命的寿命。因此，赋予了与超级电容器储存系统的杂交。另外，为能量存储系统设计的控制器应基本上响应系统的瞬态需求。在本文中，我们提出了基于K型补偿器和非线性PI控制器（NPIC）的电池和超级电容器的解耦控制策略。在独立微电网中测试配制的控制设计，用于电压调节。此外，基于基于基准的低通滤波器（LPF）的控制器提供了比较分析。获得的结果表明，所提出的控制技术具有更快的响应，具有改善的电压调节能力。对于在48V下调节的测试系统对于所呈现的各种突然负载产生的各种案例研究，所提出的方法在LPF方法中观察到的45V-56V对比度的47V-51V之间的电压偏差显着降低。此外，与基于LPF的控制策略相比，复杂性更简单，并且实现了附加感测装置的比较避震，这本身地降低了在瞬态条件下对ESS响应的不利影响。

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