模块化多电平换流器型直流输电系统的启停控制Start/Stop Control of Modular Multilevel Converter Based HVDC Transmission System
周月宾;江道灼;郭捷;梁一桥;胡鹏飞;
摘要(Abstract):
介绍了模块化多电平换流器型直流输电系统(modularmultilevel converter based high voltage direct current system,MMC-HVDC)的起停控制策略。启动分为不控启动阶段和可控启动阶段,对不控启动阶段模块化多电平换流器(modularmultilevel converter,MMC)的等效电路进行数学建模,得出了限流电阻与最大充电电流之间的数学关系,为限流电阻的选取提供了理论基础。停机分为能量反馈阶段和放电阶段,能量反馈阶段将MMC各子模块电容存储的能量部分反馈回电网,充分利用了MMC子模块储能的优势,提高了能量的利用率。放电阶段,通过一定的触发方式,逐步将能量耗散掉,该方法有效地降低了放电电阻的功率、阻值和耐压水平。最后,对建立的两端有源网络的MMC-HVDC系统进行了数字仿真,仿真结果验证了该启停控制策略的有效性。
关键词(KeyWords): 模块化多电平换流器型直流输电;启停控制;自励启动;能量反馈;放电策略
基金项目(Foundation): 国家863高技术基金项目(2008AA05Z213)~~
作者(Author): 周月宾;江道灼;郭捷;梁一桥;胡鹏飞;
Email:
DOI: 10.13335/j.1000-3673.pst.2012.03.036
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