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A Comprehensive Inertial Control Strategy for Hybrid AC/DC Microgrid With Distributed Generations

机译：分布式发电混合AC / DC微电网的综合惯性控制策略

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摘要

Lack of inertia is one problem urgent for the stability of hybrid ac/dc system. In this paper, a comprehensive inertial control strategy is proposed for stability improvement of the hybrid ac/dc microgrid. The unified inertia index is introduced to evaluate the holistic inertia level of the hybrid microgrid. Besides, the coupling relationship between ac and dc nanogrid is discussed based on the power balance, which serves as the base of mutual inertial support. The characteristics of distributed generations (DGs) are analyzed, based on which the comprehensive inertial support is designed for various DGs respectively and adaptively divided into two responses: the local support and the cross-grid support. The proposed strategy takes full use of the rotational kinetic energy of wind turbine generator (WTG), and exploits the power capacity of distributed hybrid energy storages (HESs), which improves the global stability and dynamic performance of the hybrid microgrid during power disturbance. The performance of the proposed control strategy is validated by the simulation cases with different operating scenarios.
机译：缺乏惯性是混合AC / DC系统稳定性迫切需要解决的问题之一。本文提出了一种综合惯性控制策略，以提高交流/直流混合微电网的稳定性。引入统一惯性指数来评估混合微电网的整体惯性水平。此外，基于功率平衡，讨论了交流和直流纳米电网之间的耦合关系，这是相互惯性支撑的基础。分析了分布式发电的特点，在此基础上分别为各种分布式发电设计了综合惯性支撑，并自适应地分为两个响应：局部支撑和交叉网格支撑。所提出的策略充分利用了风力发电机的旋转动能，并充分利用了分布式混合储能系统的发电能力，提高了混合微电网在电力扰动期间的整体稳定性和动态性能。所提出的控制策略的性能通过具有不同操作场景的仿真案例得到验证。

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