摘要
传统虚拟直流电机VDCM(Virtual DC Machine)控制策略未考虑直流电机转速动态调节问题,不能够在直流母线电压变化瞬间起调节作用。对此,提出一种模拟直流电机闭环调速的储能侧双向DC/DC变换器新型VDCM控制策略。对直流电机与双向DC/DC变换器在数学模型和控制策略上进行联系等效与差异剖析,模拟直流电机定转子绕组间的电磁感应作用,将直流电机动态数学模型嵌入P-U下垂控制中,使其兼备电压动态调节能力和惯性阻尼特性。对采用新型VDCM控制策略前、后的作用效果进行对比,仿真和实验结果表明该控制策略能够在提升母线电压动态调节特性的同时,增强惯性调节和阻尼效果,在负载切换或分布式发电单元输出功率波动时维持直流微电网稳定运行。
The traditional VDCM(Virtual DC Machine)control strategy does not consider the dynamic adjustment of the DC machine speed,and cannot adjust at the instant of DC bus voltage change.In view of this,a novel VDCM control strategy of the energy storage side bidirectional DC/DC converter that simulates the closed-loop speed regulation of the DC machine is proposed.The mathematical model and control strategy of the DC machine and the bidirectional DC/DC converter are analyzed,and the electromagnetic induction function between the stator and rotor windings of DC machine is simulated.The dynamic mathematical model of the DC machine is embedded in the P-U droop control,so that it has the ability of voltage dynamic regulation and inertia damping characteristics.Comparing with the effects before and after adopting the novel VDCM control strategy,the simulative and experimental results show that the control strategy can not only improve the dynamic regulation characteristics of bus voltage,but also enhance the inertia regulation and damping effect,and maintain the stable operation of DC microgrid when the load is switched or the output power of distributed generation unit fluctuates.
作者
支娜
明旭
张林杰
张辉
张伟亮
ZHI Na;MING Xu;ZHANG Linjie;ZHANG Hui;ZHANG Weiliang(School of Electrical Engineering,Xi’an University of Technology,Xi’an 710048,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2022年第12期115-121,共7页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(52077176)
国家自然科学基金面上项目(51877175)
陕西省重点项目(2017ZDXM-GY-003)。
