摘要
传统新能源微电网功率控制系统因忽略虚拟阻抗而不利于随机位置分布式电源的结合,导致容易发生电网故障,致使微电网整体瘫痪。为了解决上述问题,本文提出基于自适应虚拟阻抗的新能源微电网功率控制系统的研究。引入虚拟阻抗,降低逆变器输出功率的耦合程度。通过逆变器额定容量比值确定虚拟电阻取值范围,计算微电网输出电压,保障微电网输出电能质量。在积分控制器下控制虚拟阻抗电阻数值,使逆变器输出功率趋近于积分控制器计算得到的功率参考值,保障输出功率的稳定性,实现对新能源微电网的功率控制。设计仿真实验,结果显示:本文方法控制的逆变器在同容量逆变器并联条件下,输出的有功功率最为稳定,无功功率保持均分状态;不同容量逆变器并联条件下,输出的有功功率稳定用时最短、无功功率基本与额定容量比匹配,充分说明提出方法对新能源微电网的功率控制及运行具备较好的控制效果。
The traditional new energy microgrid power control system ignores the virtual impedance and is not conducive to the combination of distributed generations at random locations,which may lead to grid failures and paralysis of the microgrid as a whole.To solve these problems,a new energy microgrid power control system based on adaptive virtual impedance is proposed in this paper.The virtual impedance is introduced to reduce the coupling degree of inverter output power.The value range of virtual resistance is determined through the inverter rated capacity ratio,the output voltage from the microgrid is calculated,and the quality of output power from the microgrid is ensured.The resistance value of virtual impedance is controlled by an integral controller,so that the inverter output power can approach the power reference value calculated by the integral controller,thereby ensuring the stability of output power and realizing the power control of the new energy microgrid.A simulation experiment is designed,and results show that the inverter controlled by the proposed method can output the most stable active power under the condition of parallel connection of inverters of the same capacity,1and keep the reactive power equally divided.Under the condition of parallel connection of inverters of different capacities,the active power stable time is the shortest and the reactive power basically matches with the rated capacity ratio,which fully demonstrates that the proposed method has a better control effect on the power control and operation of new energy microgrids.
作者
刘强
赵文晶
LIU Qiang;ZHAO Wenjing(Jinneng Electricity Group Co.,Ltd.,Taiyuan 030002,China;Engineering Training Center,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《电源学报》
CSCD
北大核心
2023年第5期75-82,共8页
Journal of Power Supply
基金
国家自然科学基金资助项目(51777157)
山西重点研发计划资助项目(DG71-17-016)
中国电科院技术服务资助项目(DGB11201700818)。
关键词
自适应
虚拟阻抗
新能源微电网
功率控制
adaptive
virtual impedance
new energy microgrid
power control
