基于Simplex算法的高压直流输电分段变速率VDCOL研究  

Study of HVDC Piecewise Variable Rate VDCOL Based on Simplex Algorithm

作　　者：冯明[1] 李兴源[1] 李妮[1] 王超[1] 洪潮[2] 

机构地区：[1]四川大学电气信息学院,四川成都610065 [2]中国南方电网有限责任公司电网技术研究中心.广东广州510080

出　　处：《四川大学学报（工程科学版）》2015年第4期162-167,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51037003);南方电网公司科技项目(K-KY2013-001)

摘　　要：为了改善高压直流系统的故障后的恢复性能,在研究低压限流单元(voltage dependent current order limiter,VDCOL)对直流系统无功功率消耗和电压稳定性影响的基础上,提出了一种分段变速率低压限流单元(piecewise-variable-rate VDCOL,PVR-VDCOL)的控制方法,该方法通过将电压下降或恢复过程划分为几个不同的阶段,并在每个阶段根据电压水平的不同而设置不同的功率恢复速率。推导了控制器初值的计算公式,制定了利用Simplex算法优化控制器参数的流程,并重点分析了分段数目对控制器性能的影响及其确定方法。在PSCAD/EMTDC中对提出的PVR-VDCOL和传统线性VDCOL的控制效果进行了对比仿真,并对不同分段数目下的仿真结果进行了对比分析,仿真结果表明提出的PVR-VDCOL能够有效改善直流系统的恢复性能。In order to improve the performance of failure recovery characteristic of the HVDC,a novel VDCOL control method named piecewise-variable-rate VDCOL is proposed based on the study of VDCOL＇s influence on the HVDC system＇s reactive power consumption and voltage stability,which divides the voltage drop or recovery process into several different stages which have different power recovery rate according to the voltage recovery level. The formula for calculating the initial value of the controller is derived; the strategy using Simplex algorithm to optimize the controller parameters is designed,and analyzed on the number of segments effect on performance and methods to determine it. The control effect is compared between the PVR-VDCOL and the linear VDCOL,and the control effect under different number of segments was compared. The simulation results in PSCAD / EMTDC showed that the proposed PVR-VDCOL control method can effectively improve the failure recovery performance of the HVDC system.

关 键 词：高压直流输电 低压限流单元 电压稳定 Simplex算法 

分 类 号：TM712[电气工程—电力系统及自动化]