| 引用本文: | 薛英林,徐 政,张哲任,刘高任.采用不同子模块的MMC-HVDC阀损耗通用计算方法[J].电力自动化设备,2015,35(1): |
| XUE Yinglin,XU Zheng,ZHANG Zheren,LIU Gaoren.General method of valve loss calculation for MMC-HVDC with different submodules[J].Electric Power Automation Equipment,2015,35(1): |
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| 摘要: |
| 针对模块化多电平换流器型高压直流输电系统（MMC-HVDC）提出了一种阀损耗通用计算方法，可统一分析现有子模块结构：半桥子模块、全桥子模块和箝位双子模块。首先基于系统运行参数和调制控制策略解析出各子模块元件的电流、电压时域变化波形，然后利用厂商提供的特性曲线对半导体器件特性参数进行拟合，最后结合器件电流、电压波形和开断次数计算其损耗和结温。所提方法能够计及优化电容电压附加控制，且便于编程实现。基于所提方法开发了MMC-HVDC阀损耗通用分析程序，可快速计算各种工况下的换流器功率损耗分布和器件结温。通过算例计算验证了所提方法的有效性。算例结果表明：3种典型MMC拓扑中H-MMC损耗最少，C-MMC次之，F-MMC最差；环流抑制后个别运行工况下换流器损耗特性可能恶化；降低器件开关频率和提高电压调制比均可降低损耗；当器件开关频率低于某特定值（本算例为500 Hz）后，器件的通态损耗成为主导分量。 |
| 关键词: 模块化多电平换流器 阀损耗 半桥子模块 全桥子模块 箝位双子模块 换流器 |
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| 基金项目:基金项目：国家高技术研究发展计划（863计划）资助项目（2012-AA050205） |
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| General method of valve loss calculation for MMC-HVDC with different submodules |
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XUE Yinglin, XU Zheng, ZHANG Zheren, LIU Gaoren
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College of Electrical Engineering，Zhejiang University，Hangzhou 310027，China
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| Abstract: |
| A general method of valve loss calculation is proposed for MMC-HVDC（Modular Multilevel Converter based High Voltage Direct Current systems），which can uniformly analyze the existing submodule structures： half-bridge submodule，full-bridge submodule and clamp double submodule. The time-domain voltage or current waveform of each element is derived according to the operating parameters and modulation control strategy of system，the characteristic parameters of semiconductor device are acquired based on the characteristic curves provided by its manufactures，and its loss and junction temperature are calculated based on the current，voltage and switching times of the device. The proposed method considers the additional capacitor voltage optimization control and its implementation programming is easy. A general analysis program is developed based on the proposed method，which can quickly calculate the power loss distribution and device junction temperature of the MMC in various operating conditions. Its effectiveness is verified by case study，which shows that，among the three typical MMC submodule structures，the loss of half-bridge structure is the lowest while that of full-bridge structure the highest；the loss characteristic of converter may worsen in some operating conditions after the circulating current is suppressed；the loss can be deducted by reducing the device switching frequency and increasing the voltage modulation ratio；when the device switching frequency is below a certain value（500 Hz in the case），its on-state loss becomes the dominant component. |
| Key words: modular multilevel converter valve loss half-bridge submodule full-bridge submodule clamp double submodule electric converters |
