基于混合调制的模块化多电平换流器环流抑制策略

doi:10.16180/j.cnki.issn1007-7820.2021.10.007

摘要/Abstract

摘要：

为了抑制MMC运行时,由于各相上、下桥臂电压之和不完全相等而产生的二倍频环流,文中提出了一种采用自适应陷波器与准比例谐振控制器相结合的环流抑制策略。该策略借助自适应陷波器来提取二倍频环流分量,并通过准比例谐振控制器实现对此分量的无静差跟踪,从而得到需要的补偿电压。该策略结合混合调制方法使二倍频环流下降了约65%,改善了桥臂电流的畸变程度,并提高了MMC的输出波形质量。仿真结果验证了所提方案的有效性和可行性。

关键词: 模块化多电平换流器, 直流输电, 混合调制, 最近电平逼近调制, 二倍频环流, 自适应陷波器, 准比例谐振控制器, 电容电压平衡

Abstract:

In order to suppress the second harmonic circulation caused by the unequal sum of the upper and lower bridge arms voltages of each phase when the MMC is running, a circulation suppression strategy combining adaptive notch filter and quasi proportional resonance controller is proposed. The strategy uses adaptive notch filter to extract the second harmonic circulation component, and the tracking of this component without static error is realized through the quasi proportional resonance controller, thus obtaining the required compensation voltage. This strategy combined with the hybrid modulation method can reduce the second harmonic circulation by about 65%, improve the distortion degree of the bridge arm current and elevate the output waveform quality of MMC. Finally, the simulation results verify the effectiveness and feasibility of the proposed scheme.

Key words: MMC, HVDC, hybrid modulation, NLM, second harmonic circulation, adaptive notch filter, quasi proportional resonance controller, capacitor voltage balance

中图分类号:

TN35

孙悦,曾国辉,黄勃. 基于混合调制的模块化多电平换流器环流抑制策略[J]. 电子科技, 2021, 34(10): 45-50.

SUN Yue,ZENG Guohui,HUANG Bo. Circulation Suppression Strategy of MMC Based on Hybrid Modulation[J]. Electronic Science and Technology, 2021, 34(10): 45-50.

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符号	参数名称	数值
U_dc	直流母线电压/kV	5
L₀	桥臂电感/mH	10
C_SM	子模块电容/μF	500
U_c	子模块电容电压/V	1 000
f₀	基波频率/Hz	50
f₁	混合调制策略载波频率/Hz	2 800
M	调制比	0.9

比较项目	混合调制	NLM	CPS-PWM
输出相电压	8.32	14.28	29.09
输出相电流	3.58	13.85	4.82