Performance metrics for droop-controlled microgrids with variable voltage dynamics
Performance metrics for droop-controlled microgrids with variable voltage dynamics
复制标题
具有可变电压动态的下垂控制微电网的性能指标
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
H. Sandberg
中科院分区：
文献类型：
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作者：
E. Tegling;D. Gayme;H. Sandberg
本文研究了具有下垂控制逆变器的微电网的性能，即在持续小扰动下维持同步所产生的总功率损耗。逆变器采用下垂控制下的可变频率和电压进行建模。对于稳态的小波动，这些瞬态功率损耗可以通过受分布式扰动的线性系统的输入输出 H2 范数来量化。我们在具有相同逆变器的主导感应网络的假设下评估此 H2 范数。结果表明，根据之前的研究结果，虽然相位同步产生的损耗与网络的规模有关，但仅较弱地依赖于其连接性，但在高度连接的网络中，与电压控制相关的损耗将比在松散连接的网络中更大。因此，高度互连的网络中通常较高的收敛速率是以与用于达到稳定状态的功率流相关的较高损耗为代价的。
This paper investigates the performance of a microgrid with droop-controlled inverters in terms of the total power losses incurred in maintaining synchrony under persistent small disturbances. The inverters are modeled with variable frequencies and voltages under droop control. For small fluctuations from a steady state, these transient power losses can be quantified by an input-output H2 norm of a linear system subject to distributed disturbances. We evaluate this H2 norm under the assumption of a dominantly inductive network with identical inverters. The results indicate that while phase synchronization, in accordance with previous findings, produces losses that scale with a network's size but only weakly depend on its connectivity, the losses associated with the voltage control will be larger in a highly connected network than in a loosely connected one. The typically higher rate of convergence in a highly interconnected network thus comes at a cost of higher losses associated with the power flows used to reach the steady state.