论文标题
瞬态安全过滤器设计用于网格形成逆变器
Transient Safety Filter Design for Grid-Forming Inverters
论文作者
论文摘要
与常规发电机不同，基于逆变器的发电不具有任何旋转惯性。虽然形成网格的逆变器可以通过高级反馈控制回路合成小（虚拟）惯性，但仍需要其他控制机制来确保瞬态期间电网的安全性和安全性。在本文中，我们建议针对基于下垂的（网格形成）逆变器的新型实时安全约束反馈控制器（“安全过滤器”），以确保网格的瞬时安全性。安全过滤器充当网络操作层和逆变器控制层之间的缓冲区，并且仅让这些调度控制信号传递给逆变器下垂控制器，这些逆变器倾斜控制器可以保证不会违反安全规范（频率，电压，电流，当前限制）。使用分布式屏障证书方法，我们在允许的控制输入上构建包含状态的界限，这可以确保瞬态安全规范的满意度。方案总计编程用于合成安全过滤器。提供了数值模拟结果，以说明基于逆变器的微电网中提出的滤波器的性能。
Unlike conventional generators, inverter-based generation do not possess any rotational inertia. While grid-forming inverters can synthesize small (virtual) inertia via advanced feedback control loops, additional control mechanisms are needed to ensure safety and security of the power grid during transients. In this paper, we propose novel real-time safety-constrained feedback controllers ("safety filters") for droop-based (grid-forming) inverters to ensure transient security of the grid. The safety filter acts as a buffer between the network operational layer and the inverter-control layer, and only lets those dispatch control signals pass to the inverter droop-controller, which are guaranteed to not violate the safety specifications (frequency, voltage, current limits). Using a distributed barrier certificates method, we construct state-inclusive bounds on the allowable control inputs, which guarantee the satisfaction of transient safety specifications. Sum-of-square programming is used to synthesize the safety filters. Numerical simulation results are provided to illustrate the performance of the proposed filter in inverter-based microgrids.
