电力系统保护与控制2018，Vol.46Issue(5)：135-142,8.DOI:10.7667/PSPC170230
一种抑制HVDC换相失败的STATCOM补偿方案
A STATCOM compensation scheme for suppressing commutation failure in HVDC system
摘要
Abstract
This paper proposes a STATCOM compensation scheme for suppressing commutation failure in HVDC. In this scheme, the neutral-point of CHB-STATCOM with star configuration which is connected to power grid is grounded. The scheme possesses three advantages. Firstly, it reserves high economy as CHB-STATCOM with star configuration. Secondly, three phases are independent of each other, which can be considered as three single-phase STATCOMs, leading to a simple and flexible control strategy and overcoming the control problem when CHB-STATCOM with star configuration operations under unbalance grid. Thirdly, it forms zero-sequence current channel by using of characteristic of HVDC, which is the neutral-point of the AC grid connected by HVDC is directly grounded, thus it can compensate not only harmonics, positive and negative-sequence reactive power, but also zero-sequence reactive power, resulting in excellent compensatory capacity. The feasibility of the proposed scheme in HVDC is analyzed in detail. Zero-sequence current is calculated in detail under unbalanced grid condition. The control strategy is given and the simulations based on PSCAD/EMTDC are carried out to illustrate the effectiveness to suppress communication failure in HVDC.关键词
高压直流输电/换相失败/STATCOM/中性点接地/零序电流Key words
HVDC/commutation failure/STATCOM/neutral-point grounding/zero-sequence current引用本文复制引用
王轩,魏宏,欧朱建,付永生,喻劲松..一种抑制HVDC换相失败的STATCOM补偿方案[J].电力系统保护与控制,2018,46(5):135-142,8.基金项目
国家自然科学基金(51541708) （51541708）
国家电网公司科技项目(52466F150008)This work is supported by National Natural Science Foundation of China(No.51541708). （52466F150008）
