【摘要】 交直流混合微网中AC/DC接口变换器通常采用下垂控制,常规下垂控制不具备惯性和阻尼环节,对此提出一种基于交、直流微网功率传输原则的虚拟同步机控制(Virtual Synchronous Generation, VSG)策略,建立其小信号模型,分析转动惯量及阻尼系数对控制系统稳定性能的影响。针对传统VSG无法抑制交直流微网功率交换过程中的功率振荡,提出一种采用双自适应虚拟参数的VSG控制策略用于交直流混合微网AC/DC接口变换器控制系统,并通过小信号模型分析法确定额定虚拟参数取值范围。最后通过MATLAB/Simulink仿真,验证了所提方案可有效提高混合微网AC/DC接口变换器控制系统性能。更多还原

【Abstract】 Droop control is usually used in AC/DC interface converter of AC/DC hybrid micro grid. Conventional droop control does not have inertia and damping. Thus, a virtual synchronous machine control strategy based on the power transmission principle of AC and DC micro grid is proposed. The small signal model is established to analyze the influence of moment of inertia and damping coefficient on the stability of the control system. Aiming at the problem that the traditional virtual synchronous machine control can not suppress the power oscillation in the process of AC/DC micro grid power exchange, a virtual synchronous machine control strategy with double adaptive virtual parameters in the AC/DC interface converter control system of AC/DC hybrid microgrid, is proposed and the range of rated virtual parameters are determined by small signal model analysis.更多还原