摘要
电压源型高压直流输电技术(voltage source converter based high voltage direct current transmission,VSC-HVDC)在无源网络供电领域具有较好的应用前景。首先分析了向无源网络供电的两端VSC-HVDC的系统结构和工作原理,建立了系统在d-q同步旋转轴下的欧拉-拉格朗日数学模型;其次设计了PI双闭环和无源双闭环2种控制器;再次提出了基于对称最优法的外环控制器参数整定方法;在PSCAD/EMTDC中搭建了向无源网络供电的两端VSC-HVDC仿真系统,分别采用PI双闭环和无源双闭环控制器,对无源网络负荷功率变化和电压下降2种工况进行了仿真分析。仿真结果表明:所提出的控制参数整定方法是正确有效的,设计的无源双闭环控制器和PI双闭环控制器都可以实现电压、电流的快速精准控制,使无源网络电压稳定在给定值,相对而言,无源双闭环控制器的动态控制性能更好。
Abstract
The VSC-HVDC (voltage source converter based high voltage direct current transmission) system has a good application prospect in supplying power to the passive network. Firstly, this paper analyzes the system structure and working principle of VSC-HVDC in passive network power supplying and develops its Euler Lagrange (EL) model in d-q synchronous reference frame. At the same time, two controllers including a PI double closed-loop controller and a passive double closed-loop controller are designed. Then, this paper presents the parameters tuning method of outer-loop controller based on the symmetrical optimum method. Under different operating conditions including power change of passive network and voltage drop, VSC-HVDC system with a PI double closed-loop controller or a passive double closed-loop controller is simulated by software PSCAD/EMTDC. The simulation results show that the proposed control parameter tuning method is correct, the designed passive double closed-loop controller and PI double closed-loop controller can realize the fast and precise control of voltage and current, and the voltage of the passive network can be stabilized at a given value. Relatively speaking, the dynamic performance of passive double closed-loop controller is better.
关键词
电压源型高压直流输电技术(VSC-HVDC) /
无源网络 /
无源控制器 /
双闭环控制 /
PI参数整定
Key words
voltage source converter based high voltage direct current transmission (VSC-HVDC) /
passive network /
passive controller /
double closed-loop control /
PI parameters tuning
李向阳,刘应梅,王明东.
供电无源网络的VSC-HVDC系统控制器及PI参数研究[J]. 电力建设. 2016, 37(7): 71-77 https://doi.org/10.3969/j.issn.1000-7229.2016.07.010
LI Xiangyang, LIU Yingmei, WANG Mingdong.
VSC-HVDC Controller and PI Parameters Tuning in Supplying Passive Networks[J]. Electric Power Construction. 2016, 37(7): 71-77 https://doi.org/10.3969/j.issn.1000-7229.2016.07.010
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