具有线路阻抗模拟的兆瓦级多功能电网模拟器系统研究  

RESEARCH ON MULTIFUNCTIONAL HIGH POWER GRID SIMULATOR SYSTEM WITH LOAD IMPEDANCE IMITATION

作　　者：朱虹[1] 张兴[1] 李飞[1] 李明[1] 王成悦[2] Zhu Hong;Zhang Xing;Li Fei;Li Ming;Wang Chengyue(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Sungrow Power Supply Co.,Ltd.,Hefei 230088,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]阳光电源股份有限公司,合肥230088

出　　处：《太阳能学报》2020年第5期281-292,共12页Acta Energiae Solaris Sinica

基　　金：国家重点研发计划(2016YFB0900304)。

摘　　要：为满足高渗透率下大功率光伏逆变器和风电变流器电能质量及电网适应性测试平台的需求,提出一种具有线路阻抗模拟功能的兆瓦级多功能电网模拟器系统平台方案,即一种新颖的适用于兆瓦级大功率电网模拟器的拓扑结构,可解决大功率电网模拟器系统中普遍存在的控制带宽受限问题,采用滤波器分离各次谐波结合幅值闭环控制的方法实现零误差谐波电压跟踪,保证电网模拟器具备电网电压幅值和频率可调、电网电压三相不平衡、特征次谐波发生、非特征次谐波发生、高低电压穿越等功能。此外,该文提出的兆瓦级多功能电网模拟器系统可通过在线调节线路阻抗的大小实现线路阻抗模拟功能,为解决光伏并网系统中功率分配不均的问题提供了新的研究思路。最后,搭建2 MW电网模拟器实验平台,完成基本功能的测试,实验结果验证了理论的正确性和可行性。In order to meet the requirement of the power quality and grid adaptability test platform of the high power photovoltaic and wind inverters under high penetration renewable energy,a multi-functional grid simulator system platform with line impedance simulation function is proposed:a novel topology suitable for megawatt power grid simulator. The limited control bandwidth in the conventional high power grid simulator is solved. Harmonic separation is achieved by using filters. And the amplitude closed-loop control method is used to achieve zero error harmonic voltage tracking. As a result,the grid simulator has the following functions,i.e. adjustable amplitude and frequency of grid voltage,three-phase grid voltage unbalance,characteristic harmonic generation,non-characteristic harmonic generation,high voltage ride through(HVRT)and low voltage ride through(LVRT),etc.. Additionally,the proposed grid simulator system can realize line impedance simulation function by adjusting line impedance online,which provides a new research idea to solve the problem of unequal power allocation in photovoltaic grid-connected system. Finally,a 2 MW power grid simulator experiment platform is set up,and the basic functions are tested. Experimental results verify the effectiveness and validity of the theory.

关 键 词：大功率 电网 模拟器 拓扑 多功能 幅值闭环控制 阻抗模拟 

分 类 号：TK79[动力工程及工程热物理—流体机械及工程]