摘要
针对功率接口引起的稳定性和精确性问题,提出了一种适用于基于模块化多电平换流器的高压直流输电(MMC-HVDC)系统数字物理混合仿真的改进阻尼阻抗接口算法。根据MMC中功率器件断态电阻通常远大于通态电阻的特性,简化了阻抗计算过程,并采用绝对稳定且精度较高的梯形积分法对子模块电容进行离散化,实现了MMC正常运行工况下阻尼阻抗接口算法阻抗的高效匹配;结合MMC闭锁运行时的特点,提出了其闭锁时阻抗的实时匹配方法;基于傅里叶分解重构电压信号的方法实现了接口延时补偿控制,以提高系统的仿真精度。在PSCAD/EMTDC中建立了基于所提接口算法的双端MMC-HVDC数字仿真系统,对不同运行工况进行了仿真,结果表明改进阻尼阻抗接口算法可以保证混合仿真系统在不同扰动下稳定运行,且有功功率最大相对误差小于1.5%,具有优越的稳定性和精确性性能。
To deal with the stability and accuracy problem caused by the power interface, an improved damping impedance interface algorithm of power hardware-in-the-loop simulation for modular multilevel converter based high-voltage direct current（ MMC-HVDC）transmission systems is proposed. According to the characteristic of the power device in MMC, where off-resistance is generally much larger than on-resistance, the process of the impedance calculation is simplified. And the trapezoidal integral method with absolute stability and high precision is used to disperse the sub-module capacitance to realize highly efficient impedance matching for DIM under normal operating conditions of MMC. According to the characteristic of MMC blocking operation, a real-time impedance matching method for MMC blocking mode is proposed. A delay compensation control method based on Fourier decomposition for reconstructing the voltage signal is proposed to improve the accuracy of the simulation system. A digital simulation system of the two-terminal MMCHVDC transmission system is developed in PSCAD/EMTDC based on the proposed interface algorithm to simulate different operating conditions. The excellent performance of stability and accuracy is seen in simulation results that show the improved damping impedance interface algorithm is able to keep the hybrid simulation system stable under different kinds of disturbances and the maximum relative error of the active power less than 1. 5%.
作者
辛业春
江守其
李国庆
王振浩
王丽馨
XIN Yechun JIANG Shouqi LI Guoqing WANG Zhenhao WANG Lixin(School of Electrical Engineering, Northeast Dianli University, Jilin 132012, China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2016年第21期90-97,共8页
Automation of Electric Power Systems
基金
国家电网公司科技发展计划项目(SGRIZLKJ〔2015〕457号)~~
关键词
数字物理混合仿真
模块化多电平换流器
阻尼阻抗法
阻抗实时匹配
接口延时补偿
hardware-in-the-loop simulation
modular multilevel converter（MMC）
damping impedance method（DIM）
real-time impedance matching
interface delay compens ation
