Fault-tolerant Control of MMC Redundant Sub-module Cold and Hot Hybrid Standby Based on NLM

doi:10.11985/2023.04.016

Abstract

Abstract:

To improve the operational reliability of modular multilevel converter(MMC), the MMC arm is usually equipped with redundant submodules. Based on redundant MMC, the fault tolerance strategy of hot and cold hybrid standby is improved. The control complexity and power loss of MMC with different fault tolerance strategies are analyzed and compared. In order to complete the hybrid standby fault-tolerant strategy, a charging control strategy for the cold standby sub-module of MMC is proposed based on the nearest-level modulation(NLM) principle, which reduces the influence of the cold standby sub-module charging process on the output performance of MMC. In addition, the method of setting the number of hot and cold standby submodules is proposed. Finally, a 21-level three-phase MMC model is built based on the PSCAD/EMTDC simulation platform. The simulation results show that the improved mixed-reserve fault-tolerant strategy can effectively reduce the fluctuation of the fault-tolerant transition process, and verify the effectiveness and feasibility of the fault-tolerant control strategy.

Key words: Modular multilevel converter(MMC), sub-module failure, sub-module charging control, redundant fault-tolerant control, hot and cold hybrid standby

CLC Number:

TM76

XIA Changjiang, TANG Huan, HAN Minxiao, LIN Jiaxin. Fault-tolerant Control of MMC Redundant Sub-module Cold and Hot Hybrid Standby Based on NLM[J]. Journal of Electrical Engineering, 2023, 18(4): 143-151.

Figures/Tables 10

桥臂子模块数N	M值	M_R值	$λ MMCf_M R$
20	2	1	1.700×10^-8
100	10	1	3.600×10^-7
200	20	2	4.150×10^-7
300	30	3	4.486×10^-7
500	50	5	5.262×10^-7

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元件名称	数量	年故障率λ/(次/年)
开关器件T	2	0.000 700 8
二极管D	2	0.001 401 6
电容C	1	0.000 087 6

参数	取值
MMC运行子模块数N	20
冗余子模块数M	2
HRSM数M_R	1
直流侧电压U_dc/kV	±10
交流电压额定幅值/kV	10
子模电容C/mF	4
桥臂电感L/mH	10
桥臂等效电阻R/Ω	1 1.5
交流测输出功率P_s/MW	1 1.5