35kV中压电网模拟器电压采样影响及策略  

The Influence and Strategy of 35kV Medium-voltage Power Grid Simulator Voltage Sampling

作　　者：王庆发 苏建徽[1] 赖纪东[1] 孙勇 WANG Qing-fa;SU Jian-hui;LAI Ji-dong;SUN Yong(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,安徽合肥230009 [2]常州中海电力科技有限公司,江苏常州213022

出　　处：《电力电子技术》2021年第10期109-111,116,共4页Power Electronics

基　　金：中央科研基本业务费支持项目(PA2020GDGP0053)。

摘　　要：35 kV电压等级电压检测常使用电磁式电压互感器(PT)采样,由于目前高隔离电压传感器产品性能限制,35 kV的电网模拟器只能采用PT作为输出电压传感器,PT的带宽特性对电网模拟器输出电压控制有较大影响,甚至无法正常工作。针对该问题,根据PT模型,建立了系统的频域模型,并分析了 PT特性对控制系统的影响,提出电感瞬时电流内环、在低压侧增加高带宽瞬时电压中环、高压侧采用电压有效值外环的三环控制方法,提高系统的控制精度、稳定性和动态性能。实验样机验证了所述控制策略的有效性。Potential transformer(PT) is often used in medium-voltage detection,such as 35 kV.Due to the performance limitation of high isolation voltage sensor products,PT can only be used as output voltage sensor in 35 kV power grid simulator.The bandwidth characteristics of PT have a great influence on output voltage control of power grid simulator.The model of the power grid simulator is established based on the model of the PT,and then the effect of the PT on the performance is analyzed,a three-loop control method of inductor instantaneous current inner loop,instantaneous voltage middle loop with high bandwidth at the low voltage side and voltage root mean square outer loop at the high voltage side is proposed,which improves the control accuracy,stability and dynamic performance of the system.The experimental prototype verifies the effectiveness of the control strategy.

关 键 词：电网模拟器 电压互感器 三环控制 

分 类 号：TP337[自动化与计算机技术—计算机系统结构]