基于VSG技术的分布式电源自适应阻尼控制

Adaptive Damping Coefficient Control Strategy of Distributed Generators Based on VSG Technology

逆变型分布式电源(IIDG)是可再生能源的主要类型之一,其控制效果对配电网的运行有较大的影响。传统控制模式下IIDG无法给系统提供惯性从而导致动态稳定性不足。这里在IIDG控制系统中引入虚拟同步发电机(VSG)技术,并分别针对有功频率控制、电压无功控制以及电压电流控制进行了优化。通过小信号模型分析了阻尼系数对系统输出的影响,进而提出了一种自适应阻尼控制策略。最后,分别通过PSCAD/EMTDC系统仿真与额定功率0.5 MW原理样机实验对所提自适应阻尼控制与传统固定阻尼系数控制进行了对比验证,实验结果验证了所提控制方法有效提升了IIDG的动态响应特性。

Inverter interfaced distributed generators(IIDG)is one of the main types of renewable energy,and its control effect has great influence on the operation of distribution network.In the traditional control mode,the IIDG cannot provide inertia to the system,which leads to the lack of dynamic stability.Virtual synchronous generator(VSG)technology is introduced into the IDG control system,and the active power frequency control,voltage reactive power control and voltage current control are optimized.The influence of damping coefficient on system output is analyzed by small signal model,and then an adaptive damping control strategy is proposed.Finally,the PSCAD/EMTDC system simulation and the rated power O.5 MW principle prototype experiment are conducted to compare and verify the adaptive damping proposed control and the traditional fixed damping coefficient control.The experimental results verify that the proposed control method effectively improves the dynamic response characteristics of the IDG.