摘要
针对虚拟同步发电机(virtual synchronous generator,VSG)控制的分布式能源(distributed generation,DG)和电网之间的阻抗比过高,引起的功率耦合问题。对功率耦合机理进行了分析,通过相对静态增益系数建立了功率与阻抗比及功角的耦合度关系,提出了一种基于虚拟负阻抗的虚拟功率控制技术,利用虚拟阻抗计算虚拟电压,并将得到的虚拟电压反馈到功率计算部分,形成虚拟功率实现功率解耦,并基于耦合度约束条件给出了虚拟电阻和电感具体的求解方法。最后利用MATLAB/Simulink仿真软件搭建仿真模型,通过与传统虚拟阻抗技术进行比较,验证了所提出的虚拟功率控制策略对减弱有功环与无功环之间的耦合有明显作用。
Aiming at the power coupling problem caused by the high impedance ratio between the distributed energy(DG)controlled by the virtual synchronous generator(VSG)and the power grid.In this paper,the power coupling mechanism is analyzed,and the coupling relationship between power and impedance ratio and power angle is established by relative static gain coefficient.A virtual power control technology based on virtual negative impedance is proposed.The virtual impedance is used to calculate the virtual voltage,and the obtained virtual voltage is fed back to the power calculation part to form the virtual power to realize power decoupling.Based on the constraint condition of coupling degree,the specific solution method of virtual resistance and inductance is given.Finally,the simulation model is built by using MATLAB/Simulink simulation software.By comparing with the traditional virtual impedance technology,it is verified that the proposed virtual power control strategy has a significant effect on weakening the coupling between the active and reactive power loops.
作者
高云广
樊敏洁
纪建朋
孙凯亮
陈鹏
GAO Yun-guang;FAN Min-jie;JI Jian-peng;SUN Kai-liang;CHEN Peng(College of Electronic Information Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《科学技术与工程》
北大核心
2024年第31期13415-13424,共10页
Science Technology and Engineering
基金
山西省自然科学基金面上项目(202203021211201)。
关键词
虚拟同步发电机
微电网
虚拟负阻抗
功率耦合
虚拟功率
virtual synchronous generator
microgrid
virtual negative impedance
power coupling
virtual power
