电压不平衡条件下VSC-MVDC系统PID加谐振滑模直接功率控制  

PID Plus Resonant Sliding Mode Direct Power Control for VSC-MVDC System Under Unbalanced Grid Voltage Conditions

作　　者：杨卫朋[1] 张爱民[1] 李俊刚[2] 张杭[1] 王建华[1] YANG Weipeng;ZHANG Aimin;LI Jungang;ZHANG Hang;WANG Jianhua(School of Electrical Engineering,Xi＇an Jiaotong University,Xi＇an 710049,Shaanxi Province,China;State Grid Xuji Group Corporation,Xuchang 461000,Henan Province,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]国网许继集团有限公司,河南省许昌市461000

出　　处：《电网技术》2018年第8期2399-2407,共9页Power System Technology

基　　金：国家重点研发计划项目(2016YFB0900500)~~

摘　　要：针对电压不平衡条件下VSC-MVDC系统的控制,提出了基于比例积分微分（proportional-integral-derivative,PID）加谐振（proportional-integral-derivative plus resonant,PIDR）的滑模直接功率控制（sliding mode control direct power control,SMC DPC）策略。推导出一种在保证网侧电流无畸变的条件下对有功和无功纹波幅值之比连续调节的方法。为消除无功纹波对有功输出的影响,提出一种逆向有功纹波注入的策略。应用滑模控制方法设计了包含比例、积分、微分和谐振等控制律的跟踪控制器。其中,谐振控制用于消除有功和无功动态之间耦合对控制性能的影响,有功和无功参考的微分通过简单的代数运算得到。有功和无功纹波控制目标实质相同,对有功采用PIDR而无功采用PID即可实现精确的功率控制。基于SIMULINK/MATLAB平台对一个两端VSC-MVDC系统进行仿真实验,验证了该PIDRSMC DPC策略的有效性。A proportional-integral-derivative（PID） plus resonant（PIDR） sliding mode direct power control（PIDRSMC DPC） strategy for voltage source converter-based medium voltage direct current（VSC-MVDC） system under unbalanced grid voltage conditions is proposed. Through instantaneous power flow analysis, a generalized power ripple compensation（GPRC） method is obtained, whereby the ratio of active power ripple amplitude to reactive power ripple amplitude can be controlled continuously without current distortion. An inverse active power ripple injection scheme is proposed to eliminate the influence of reactive power ripples on active power output. A sliding mode control-based controller including PIDR control laws is designed, where the resonant law is used to eliminate influence of the coupling between active and reactive powers, and the derivatives of power references are obtained by simple algebraic operations. Utilizing the power trajectory planning function provided by GPRC method, accurate power control can be achieved by adopting PIDR control for active power and PID control for reactive power. Simulation studies on a two-terminal VSC-MVDC system are conducted in SIMULINK/MATLAB to verify effectiveness of the PIDRSMC DPC strategy.

关 键 词：柔性中压直流 电压不平衡 直接功率控制 滑模控制 谐振控制 逆向有功纹波注入 

分 类 号：TM721[电气工程—电力系统及自动化]