Probability-Based Modeling and Analysis for PS-PWM in an MMC Distributed Control System With Sub-Module Asynchrony

Probability-Based Modeling and Analysis for PS-PWM in an MMC Distributed Control System With Sub-Module Asynchrony
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子模块异步MMC分布式控制系统中PS-PWM的基于概率的建模与分析

DOI:
10.1109/tpel.2019.2916174
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发表时间:
2019-05
影响因子:
6.7
通讯作者:
Wang Tao
Wang Tao
中科院分区:
工程技术1区
文献类型:
--
作者:
Yang Shunfeng;Wang Haiyu;Chen Haiyu;Song Wensheng;Wang Tao

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高压直流输电系统中的模块化多电平换流器通常采用分布式控制系统,由大量的本地控制器来管理系统中大量的子模块。本地控制器的晶体振荡器的制造公差引入控制器时钟差异,并最终导致在相移脉宽调制方案的单个SM中实现的三角载波的混乱。考虑到正态分布振子的容差,本文基于概率论建立了三角载波频率偏差的数学模型。提出了考虑这种谐波的开关函数模型,可以定量分析和评价开关谐波含量。谐波含量的理论计算和实验结果之间取得了很好的一致性。计算出的开关谐波可用于根据系统要求确定同步间隔。
Modular multilevel converters for high-voltage dc transmission applications normally adopt a distributed control system, where a large number of local controllers are employed, to manage considerable sub-modules (SMs) in the system. The manufacturing tolerance of crystal oscillators for local controllers introduces controller clock discrepancy and eventually leads to the asynchrony of triangular carriers implemented in individual SM for phase-shifted pulsewidth modulation scheme. Considering the tolerance of oscillators having a normal distribution, the deviation of the triangular carrier frequency is modeled based on the probability theory in this letter. The switching function model taking such asynchrony into account is proposed allowing quantitative analysis and evaluation of the switching harmonic contents. Good agreements of the harmonic contents have been achieved between the theoretical calculation and experimental results. The calculated switching harmonics can be used to determine the synchronization interval according to the system requirements.
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