论文标题
耦合发电机除惯性外还需要稳定性缓冲区
Coupled power generators require stability buffers in addition to inertia
论文作者
论文摘要
增加惯性被普遍认为是解决耦合振荡器之间不稳定相互作用的解决方案。在电网中，提出了虚拟同步发电机（VSG）来补偿还原的惯性，因为旋转同步发电机正在逐步淘汰。然而，建模VSG和旋转发电机如何同时贡献能量和惯性，我们出人意料地发现，尽管系统惯性相当高，但仍会出现小信号的不稳定性。重要的是，我们表明存在可以安全支持的最佳和最大数量的此类VSG，这是先前未知的结果，这对于长期计划和制造商合同中的Power Fitricities直接有用。同时，为了在短期内解决不稳定性，我们认为新市场应包括我们称为稳定性存储的另一种商品，在这种商品中 - 与储能缓冲能源失衡类似 - VSGS是分散的稳定缓冲液。在展示了这一概念对各种能源期货的有效性的同时，我们为政策制定者和公用事业提供了实现100％可再生网格的路线图。
Increasing the inertia is widely considered to be the solution to resolving unstable interactions between coupled oscillators. In power grids, Virtual Synchronous Generators (VSGs) are proposed to compensate the reducing inertia as rotating synchronous generators are being phased out. Yet, modeling how VSGs and rotating generators simultaneously contribute energy and inertia, we surprisingly find that instabilities of a small-signal nature could arise despite fairly high system inertia. Importantly, we show there exist both an optimal and a maximum number of such VSGs that can be safely supported, a previously unknown result directly useful for power utilities in long-term planning and prosumer contracting. Meanwhile, to resolve instabilities in the short term, we argue that the new market should include another commodity that we call stability storage, whereby -- analogous to energy storage buffering energy imbalances -- VSGs act as decentralized stability buffers. While demonstrating the effectiveness of this concept for a wide range of energy futures, we provide policymakers and utilities with a roadmap towards achieving a 100% renewable grid.
