Strategy Design and Parameter Optimization of High-Frequency Resonance Suppression for Modular Multilevel Converter

doi:10.11930/j.issn.1004-9649.202405143

Abstract

Abstract:

Addressing the issue of high-frequency oscillations in converter stations during flexible DC grid integration and transmission, a suppression scheme combining active and passive damping, along with a method for optimizing the design of its parameters, is proposed. This scheme aims to alter the impedance characteristics of the converter station from a passive perspective, thereby achieving reliable suppression of high-frequency oscillations. Firstly, by analyzing the negative damping characteristics within the simplified high-frequency impedance model of the converter station, the principle is revealed that the active damping in the suppression scheme should shift the negative damping of the converter station to higher frequencies. Secondly, based on the impedance model, the principle for selecting the parameters of the active damping controller for virtual series impedance is derived, and appropriate parameters are obtained using a coefficient fitting method. Subsequently, with the goal of reducing investment costs and the constraint of completely eliminating high-frequency negative damping, an optimization algorithm is employed to determine the parameters of the passive filter. By comparing the parameter changes of the passive filter before and after the addition of virtual series impedance, the economic benefits of the coordinated suppression scheme are highlighted. Finally, electromagnetic transient simulations verify the correctness and effectiveness of the suppression scheme under the optimized parameter design method.

Key words: flexible HVDC, converter station, high-frequency resonance, passive filter, coefficient fitting, optimistic algorithm

Xiao ZHOU, Yuexi YANG, Longze KOU, Yunfeng LI, Xuewei QIAN, Jie HAO, Weizhe JING. Strategy Design and Parameter Optimization of High-Frequency Resonance Suppression for Modular Multilevel Converter[J]. Electric Power, 2025, 58(1): 50-60.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202405143

https://www.electricpower.com.cn/EN/Y2025/V58/I1/50

Figures/Tables 18

Fig.1 Construction of flexible DC grid based on MMC

Fig.2 Passive filter structure and configuration

Fig.3 The influence of passive filter parameters on active and reactive power

Fig.4 Construction of converter station controller

Fig.5 Three types of voltage feedforward impedance phase and conductivity

Fig.6 Impedance characteristic in three types of filters

Fig.7 Conductance characteristics of converter stations in three types of filters

Fig.8 Stability determination of three types of digital filters for converter stations

Table 1 First order filter coefficients under different link delays

1阶滤波器系数	链路延时
1阶滤波器系数	350 μs	450 μs	550 μs
增益k_vir/dB	–300	–350	–200
截止角频率ω_vir/(rad·s^–1)	9348.1	7199.1	5766.8

Fig.9 Conductivity characteristics of converter stations under different delays

Fig.10 Stability determination of converter stations under different delays

Table 2 Comparison of passive filter parameters under different scenarios

阻尼控制方式	C_p1/ μF	C_p2/ μF	L_p/ mH	R_p/ Ω	有功损耗/W	无功补偿/ (MV·A)
原方案	0.577	563.0	18.0	84	10^–7（约为0）	67.90
无阻尼	0.105	83.9	227.3	1917	238.9	12.39
3种数字滤波器	0.085	83.9	227.3	1917	156.4	10.03

Fig.11 Theoretical verification of suppression scheme conductivity

Table 3 Comparison of passive filter parameters under different link delays

链路延时/μs	有源阻尼	无源电容C_p1/μF	无功补偿/(MV·A)
350	无	0.055	6.48
350	有	0.050	5.89
450	无	0.074	8.72
450	有	0.065	7.66
550	无	0.105	12.39
550	有	0.085	10.03

Fig.12 Schematic of simulation system

Fig.13 Electromagnetic transient simulation of active and reactive power changes

Fig.14 Electromagnetic transient simulation of three-phase voltage changes

Fig.15 Simulation verification of inductance changes

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