摘要
针对光伏系统广泛应用DC/DC变换器导致直流微电网低惯性、弱阻尼问题,采用具有虚拟惯量与阻尼系数的虚拟直流发电机控制策略以改善控制效果,使变换器具有类似于直流电机的端口电压特性,且增加系统的惯性和阻尼大小,以提高系统的稳定性。在Matlab/Simulink环境下,采用电压电流双闭环控制策略与虚拟直流发电机控制策略对Buck-Boost变换器进行控制,并将仿真结果进行对比分析。结果表明,相对于电压电流双闭环控制策略,引入虚拟惯量的虚拟直流发电机控制策略有助于解决由于光伏阵列输出电压、直流母线电压波动和负荷大小变化引起的DC/DC变换器输出侧电压波动问题。
Aiming at the problem of low inertia and weak damping of DC/DC converter widely used in photovoltaic system,the control strategy of virtual DC generator with virtual inertia and damping coefficient is adopted to improve the control effect.The converter has port voltage characteristics similar to DC motor and the inertia and damping of the system are increased to improve the stability of the system.Under the Matlab/Simulink environment,voltage and current double closed loop control strategy and virtual DC generator control strategy are adopted to control the BuckBoost converter and the simulation results are compared and analyzed.The results show that compared with the voltage and current double closedloop control strategy,the virtual DC generator control strategy with virtual inertia is helpful to solve the voltage fluctuation problem of DC/DC converter output side caused by photovoltaic array output voltage,DC bus voltage fluctuation and load change.
作者
杨新华
马文海
李亚敏
YANG Xinhua;MA Wenhai;LI Yamin(School of Electrical Engineering and Information Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Gansu Advanced Control of Industrial for Process,Lanzhou University of Technology,Lanzhou 730050,China;Bohai NKK Drill Pipe Co.,Ltd.,Cangzhou 062650,China)
出处
《电子设计工程》
2021年第22期80-84,共5页
Electronic Design Engineering
