引入分散互阻尼暂态补偿的多VSG系统振荡抑制策略

Oscillation Suppression Strategy for Multi-VSG System with Decentralized Mutual Damping Transient Compensation

虚拟同步发电机(VSG)之间存在动态响应差异,导致多VSG并联系统在负荷切换等暂态过程中产生振荡。提出了分散互阻尼暂态补偿策略,可有效抑制多VSG并联系统暂态过程的振荡。首先,建立多VSG并联系统的转子方程小信号数学模型,分析系统振荡机理;针对VSG关键参数,探讨了系统稳定性。其次,增加VSG互阻尼,精确控制各VSG的动态响应过程,加快同步过程,增强同步性能。同时,设计暂态补偿环节,为系统提供必要的暂态阻尼和功率补偿,使系统面对扰动时能够快速恢复稳定状态。最后,通过在MATLAB仿真平台验证了所提振荡抑制策略的正确性和有效性。

There is a difference in dynamic response between virtual synchronous generators(VSGs),resulting in the oscillation of multi-VSG parallel systems in the transient process of load switching.The paper proposes a decentralized mutual damping transient compensation strategy to effectively suppress the oscillation of the multi-VSG parallel systems in the transient process.Firstly,the small signal mathematical model of the rotor equation of the multi-VSG parallel system is established,and the oscillation mechanism of the system is analyzed.According to the key parameters of VSG,the system stability is discussed.Then,the mutual damping of VSG is increased to accurately control the dynamic response process of each VSG,speeding up the synchronization process and enhancing the syn-chronization performance.At the same time,the transient compensation link is designed to provide the necessary transient damping and power compensation for the system,so that to restore the system stability in the face of dis-turbances.Finally,the correctness and effectiveness of the proposed oscillation suppression strategy are verified on the MATLAB simulation platform.