虚拟同步发电机的功率动态耦合机理及同步频率谐振抑制策略

发布时间：2018-05-17 09:27

本文选题：虚拟同步发电机 + 电压源型换流器　；参考：《中国电机工程学报》2017年02期

【摘要】：随着新能源并网的增加,现有并网逆变器采用的直接电流控制无法有效跟踪电网电压。虚拟同步发电机(virtual synchronous generators,VSG)技术通过模拟同步发电机运行机制,改善了系统稳定性,成为解决分布式电源高渗透率问题的有效方案之一。然而,虚拟同步发电机存在同步频率谐振现象,容易引发功率振荡,导致系统不稳定。该文分析电磁磁链的动态过程;通过建立虚拟同步发电机的宽频域功率动态耦合模型,发现有功无功的功率耦合效应会加剧同步频率谐振;基于同步频率谐振的产生机理,采用有源阻尼控制的策略能有效抑制该谐振问题。最后,通过搭建实验平台,验证虚拟同步发电机中的同步频率谐振现象、有功无功动态耦合效应正确性及阻尼抑制策略的有效性。
[Abstract]:With the increase of new energy, the current direct current control of grid-connected inverters can not effectively track the grid voltage. Virtual synchronous generators (VSGs) technology improves the stability of the system by simulating the operation mechanism of the synchronous generators and becomes one of the effective solutions to solve the problem of high permeability of distributed power supply. However, the synchronous frequency resonance exists in the virtual synchronous generator, which can easily lead to power oscillation and lead to the instability of the system. In this paper, the dynamic process of electromagnetic flux is analyzed, and by establishing the power dynamic coupling model of virtual synchronous generator in wide frequency domain, it is found that the power coupling effect of active power and reactive power will aggravate the synchronous frequency resonance, and based on the generation mechanism of synchronous frequency resonance, The active damping control strategy can effectively suppress the resonance problem. Finally, the experiment platform is built to verify the synchronous frequency resonance phenomenon in virtual synchronous generator, the correctness of active and reactive power dynamic coupling effect and the effectiveness of damping suppression strategy.
【作者单位】：浙江大学电气工程学院;
【分类号】：TM464

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