Loss distribution analysis and accurate calculation method for bulk-power MMC

IF 8.7 1区工程技术 Q1 ENERGY & FUELS

Protection and Control of Modern Power Systems Pub Date : 2023-11-10 DOI:10.1186/s41601-023-00313-x

Yonghui Song, Yongjie Luo, Xiaofu Xiong

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引用次数: 0

Abstract

Abstract Accurate evaluation of power losses in a modular multilevel converter (MMC) is very important for circuit component selection, cooling system design, and reliability analysis of power transmission systems. However, the existing converter valve loss calculation methods using the nearest level modulation (NLM) method and the traditional sorting-based capacitor voltage balancing strategy are inaccurate since the submodule (SM) switching logics in the MMC arms are uncertain. To solve this problem, the switching principle of the SMs in the sorting-based voltage balancing strategy is analyzed. An accurate MMC power loss calculation method based on the analysis of loss distribution of various SM topologies, including half-bridge submodule (HBSM), full-bridge submodule (FBSM) and clamp double submodule (CDSM), is proposed in this paper. The method can accurately calculate the losses caused by the extra switching actions during the capacitor voltage balancing process, thus greatly increasing the calculation accuracy of switching losses compared with existing methods. Simulation results based on a practical ± 350 kV/1000 MW MMC-HVDC system with variety of MMC topologies with different voltage balancing strategies demonstrate the effectiveness of the proposed method.

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大功率MMC的损耗分布分析及精确计算方法

摘要准确评估模块化多电平变换器(MMC)的功率损耗对电路元件选择、冷却系统设计和输电系统可靠性分析具有重要意义。然而，由于MMC臂中的子模块(SM)切换逻辑不确定，现有的基于最近电平调制(NLM)方法和传统的基于分选的电容器电压平衡策略的换流阀损耗计算方法不准确。为了解决这一问题，分析了基于分选的电压平衡策略中SMs的开关原理。本文在分析半桥子模块(HBSM)、全桥子模块(FBSM)和箝位双子模块(CDSM)等各种SM拓扑损耗分布的基础上，提出了一种精确的MMC功率损耗计算方法。该方法可以准确地计算出电容器电压平衡过程中额外开关动作所造成的损耗，与现有方法相比，大大提高了开关损耗的计算精度。基于±350kv / 1000mw MMC- hvdc实际系统的仿真结果验证了该方法的有效性，该系统具有多种MMC拓扑和不同的电压平衡策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Protection and Control of Modern Power Systems Multiple-

CiteScore

20.10

自引率

8.20%

发文量

审稿时长

4 weeks

期刊介绍： Protection and Control of Modern Power Systems (PCMP) is the first international modern power system protection and control journal originated in China. The journal is dedicated to presenting top-level academic achievements in this field and aims to provide a platform for international researchers and engineers, with a special focus on authors from China, to maximize the papers' impact worldwide and contribute to the development of the power industry. PCMP is sponsored by Xuchang Ketop Electrical Research Institute and is edited and published by Power System Protection and Control Press. PCMP focuses on advanced views, techniques, methodologies, and experience in the field of protection and control of modern power systems to showcase the latest technological achievements. However, it is important to note that the journal will cease to be published by SpringerOpen as of 31 December 2023. Nonetheless, it will continue in cooperation with a new publisher.