并网模式下虚拟同步发电机的虚拟惯量控制策略
摘要：并网模式下，当电网频率出现偏差或者调度指令变化时，虚拟同步发电机（virtual synchronous generator，VSG）输出有功功率都会发生波动，然而现有的VSG分析以及控制方式只能应对调度指令变化下的有功功率波动：电网频率发生偏差时，现有的控制策略可能会使VSG输出有功功率出现较大波动。针对上述问题，首先分析了电网频率偏差下，VSG参数对VSG动态特性的影响以及调度指令变化下，功角振荡和虚拟惯量之间的关系。在此基础上，提出一种虚拟惯量控制策略：在调度指令变化时，采用虚拟惯量自适应控制，并给出参数选取原则；在电网频率发生偏差时，采用基于信息熵的虚拟惯量寻优值。最后通过Matlab/Simulink仿真，验证了所提虚拟惯量控制策略在有功调度和电网频率偏差下的优越动态特性。
Abstract:In the grid-connected mode, when grid frequency deviation occurs or dispatch command varies the output active power from virtual synchronous generator (abbr. VSG) fluctuates, however, existing VSG analysis and control mode can only response to the active power fluctuation caused by the change of dispatch command; when grid frequency deviation occurs, existing control strategy might lead to the larger fluctuation of VSG output active power. In allusion to above mentioned problem, firstly, the influence of VSG parameters on VSG dynamic performance under the grid frequency deviation and the relation between angle oscillation and virtual inertia under the variation of dispatch command were analyzed. Secondly, on this basis, a control strategy for virtual inertia was proposed, that is, when the variation of dispatch command occurred, the adaptive control of virtual inertia was adopted, and the principle for the parameter selection was given. Thirdly, when grid frequency deviation occurred, the information entropy-based optimizing value of virtual inertia was adopted. Finally, by means of Matlab/Simulink simulation, the superior dynamic performance of the proposed virtual inertia control strategy under the deviation of active power dispatch and grid frequency deviation was verified.
标题：并网模式下虚拟同步发电机的虚拟惯量控制策略
英文标题：Virtual Inertia Control Mode of Virtual Synchronous Generator Under Grid Connected Strategy
作者：邵一阳, 刘铠诚, 董树锋,
关键词：虚拟同步发电机, 功率振荡, 电网频率偏差, 自适应控制, 信息熵,
发表日期：2022-04-10
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