A Control Strategy of Frequency Self-adaptation Without Phase-locked Loop for VSC-HVDC  

作　　者：Yunfeng Li Guangfu Tang Ting An Hui Pang Zhiyuan He Yanan Wu 

机构地区：[1]Global Energy Interconnection Research Institute,Beijing 102202,China [2]State Key Laboratory of Advanced Transmission Technology,Beijing 102202,China

出　　处：《CSEE Journal of Power and Energy Systems》2017年第2期131-139,共9页中国电机工程学会电力与能源系统学报（英文）

基　　金：supported by the Science and Technology Project of the State Grid Corporation of China(SGRIZLKJ[2015]457)。

摘　　要：A control strategy of frequency self-adaptation without phase-locked loop(PLL)underαβstationary reference frame(αβ-SRF)for a VSC-HVDC system is presented to improve the operational performance of the system under severe harmonic distortion conditions.The control strategy helps to eliminate the cross-coupling under dq synchronous reference frame(dq-SRF),and is achieved through two key technologies:1)positive phase sequence(PPS)and negative phase sequence(NPS)fundamental components are extracted from the AC grid voltage with an improved multiple complex coefficient filter(IMCF),and 2)grid instantaneous frequency is rapidly and precisely tracked using a frequency self-adaptation tracking algorithm(FATA)without PLL.The proposed strategy is applied to a point-to-point VSCHVDC system and validated by means of simulations.The results are compared to those with the traditional vector control strategy under dq-SRF.Simulation results illustrate that the proposed strategy results in better system performance than that with the traditional strategy in terms of harmonic suppression under normal and severe operating conditions of the AC system.

关 键 词：Frequency self-adaptation tracking algorithm high voltage direct current improved multiple complex coefficient filter modular multilevel converter phase-locked loop voltage source converter 

分 类 号：TM7[电气工程—电力系统及自动化]