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现有电容电压纹波抑制主要通过注入二倍频环流实现，使得MMC（模块化多电平换流器）阀损耗升高，降低了换流阀的运行效率与可靠性。为解决上述问题，分析了最优二倍频环流注入下的MMC电容电压纹波特性，揭示了电容电压纹波抑制对换流阀造成的损耗增量。针对采用CPS-PWM（载波相移脉宽调制）的中低压MMC，提出了一种考虑电容电压纹波抑制的MMC降损控制策略，在满足电容电压纹波和阀损耗的优化目标及约束条件的基础上，通过优化控制桥臂电流以消除电容电压纹波抑制下的阀损耗增量，同时保证电容电压纹波抑制效果不受明显影响。最后，在MATLAB/Simulink中进行了多工况对比分析，验证了阀损耗特性分析的正确性与所提出控制策略的有效性。
Abstract：Existing capacitor voltage ripple suppression methods primarily rely on second-harmonic circulating current injection(SHCCI). However, these methods often increase valve losses in modular multilevel converters(MMCs), degrading operational efficiency and reliability. To address this challenge, this paper first analyzes the capacitor voltage ripple characteristics of MMCs under optimal SHCCI and reveals the additional converter valve losses incurred by ripple suppression. For medium-and low-voltage MMCs employing carrier phase shift pulse width modulation(CPS-PWM), a loss-reduction control strategy is proposed that explicitly considers capacitor voltage ripple suppression. Based on the optimization objectives and constraints of capacitor voltage ripple and valve loss, the bridge arm current is optimally controlled to eliminate the valve loss increment induced by ripple suppression while maintaining ripple suppression performance. Finally, a comparative analysis under multiple operating conditions is performed in MATLAB/Simulink to validate the accuracy of the valve loss characteristic analysis and the effectiveness of the proposed control strategy.
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基本信息:
DOI：10.19585/j.zjdl.202507009
中图分类号:TM46
引用信息:
[1]方东平,丘扬,崔金栋等.考虑电容电压纹波抑制的MMC最优降损控制策略[J].浙江电力,2025,44(07):82-92.DOI:10.19585/j.zjdl.202507009.
基金信息:
吉林省科技发展项目(242735XM0103119704); 浙江大有集团有限公司科技项目(DY2023-23)