35 kV电网模拟器电压反馈影响及改进方法  

Voltage feedback influence and improvement method of 35 kV power grid simulator

作　　者：董磊[1] 苏建徽[1] 施永[1] 孙勇 谷林超 DONG Lei;SU Jianhui;SHI Yong;SUN Yong;GU Linchao(The Ministry of Education Photovoltaic System Engineering Research Center,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学光伏系统教育部工程研究中心,合肥230009

出　　处：《电测与仪表》2024年第8期166-171,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51907045)。

摘　　要：为满足中压直挂式光伏电站、储能电站以及风电机组的电网适应性测试需求,需要研制一种35 kV/3.5 MW电网模拟器,针对电压互感器(potential transformer,PT)响应特性影响系统控制性能的问题,文章对PT进行了建模和特性分析,论证了PT特性对系统控制性能的影响机理。根据所述电网模拟器电路拓扑,给出了一种变压器低压侧瞬时电压、电流反馈与高压有效值反馈的改进三环控制策略,以提高电网模拟器输出电压的动态、稳态性能,并在仿真与样机中验证了改进控制策略的可行性和有效性。In order to meet the power grid adaptability test requirements of medium-voltage direct-connected photovoltaic power stations,energy storage power stations and wind turbines,a 35 kV/3.5 MW grid simulator needs to be developed.Aiming at the problem that the response characteristics of potential transformer(PT)affect the control performance of the system,modeling and characteristic analysis of PT is carried out,and the influence mechanism of PT characteristics on the control performance of the system is demonstrated.According to the circuit topology of the power grid simulator,an improved three-loop control strategy that instantaneous voltage,current feedback on the low voltage side of the transformer and high voltage RMS feedback is presented to improve the dynamic and steady performance of the output voltage of the power grid simulator.The feasibility and effectiveness of the improved control strategy are verified in simulation and prototype.

关 键 词：电网模拟器 电压互感器 控制策略 

分 类 号：TM351[电气工程—电机]