| 直流配电网MMC-H型直流变压器回流功率的变频优化 |
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| 引用本文： | 梅军,管州,丁然,范光耀,葛锐,王冰冰,梁东,宗瑾.直流配电网MMC-H型直流变压器回流功率的变频优化[J].电力自动化设备,2020,40(2):14-20,1-2. |
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| 作者姓名： | 梅军 管州 丁然 范光耀 葛锐 王冰冰 梁东 宗瑾 |
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| 作者单位： | 东南大学 电气工程学院，江苏 南京 210096,东南大学 电气工程学院，江苏 南京 210096,东南大学 电气工程学院，江苏 南京 210096,东南大学 电气工程学院，江苏 南京 210096,东南大学 电气工程学院，江苏 南京 210096,东南大学 电气工程学院，江苏 南京 210096,国网冀北电力有限公司，北京 100054,国网冀北电力有限公司，北京 100054 |
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| 基金项目： | 国家电网公司科技项目(520101170022) |
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| 摘 要： | 研究适用于直流配电网的模块化多电平换流器H桥(MMC-H)型直流变压器,其由模块化多电平(MMC)桥臂、H桥和交流变压器组成。MMC采用阶梯波调制,H桥采用方波调制。推导出基于移相控制的传输功率与回流功率表达式,总结影响回流功率的因素与零回流功率的边界条件。为抑制回流功率,提出了变频优化策略,通过工作频率的变化来调节移相比落入零回流功率区域,减小回流功率与电流应力。最后,搭建实验平台对变频优化控制策略进行验证,实验结果表明变频优化控制策略能够调节移相比,降低电流应力与损耗,提高直流变压器效率。
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| 关 键 词： | 模块化多电平换流器 直流变压器 功率表达式 零回流功率区域 变频优化 |
| 收稿时间： | 2019/3/28 0:00:00 |
| 修稿时间： | 2019/11/11 0:00:00 |
Variable-frequency optimization strategy based on backflow power of MMC-H DC transformer in DC distribution network |
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| MEI Jun,GUAN Zhou,DING Ran,FAN Guangyao,GE Rui,WANG Bingbing,LIANG Dong and ZONG Jin.Variable-frequency optimization strategy based on backflow power of MMC-H DC transformer in DC distribution network[J].Electric Power Automation Equipment,2020,40(2):14-20,1-2. |
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| Authors: | MEI Jun GUAN Zhou DING Ran FAN Guangyao GE Rui WANG Bingbing LIANG Dong and ZONG Jin |
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| Affiliation: | School of Electrical Engineering, Southeast University, Nanjing 210096, China,School of Electrical Engineering, Southeast University, Nanjing 210096, China,School of Electrical Engineering, Southeast University, Nanjing 210096, China,School of Electrical Engineering, Southeast University, Nanjing 210096, China,School of Electrical Engineering, Southeast University, Nanjing 210096, China,School of Electrical Engineering, Southeast University, Nanjing 210096, China,State Grid Jibei Electric Power Co.,Ltd.,Beijing 100054, China and State Grid Jibei Electric Power Co.,Ltd.,Beijing 100054, China |
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| Abstract: | The MMC-H(Modular Multilevel Converter-H-bridge) DC(Direct Current) transformer suitable for DC distribution system is studies, which is composed of MMC arm, H-bridge and AC transformer. MMC utilizes staircase modulation and H-bridge adopts square-wave modulation. Besides, the formula of transmission power and backflow power based on phase-shift control are derived, and the factors that affect the backflow power and the boundary conditions of zero backflow power are summarized. In order to suppress the backflow power, a variable-frequency optimization strategy is proposed. The phase-shift ratio can be adjusted to fall into the zero backflow power zone through variable operating-frequency strategy, so as to reduce the backflow power and current stress. Finally, an experimental prototype is built to verify the feasibility of variable-frequency optimization strategy. The experimental results show that the variable-frequency optimization strategy can adjust the phase-shift ratio, reduce the current stress and loss, and improve the efficiency of DC transformer. |
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| Keywords: | modular multilevel converter DC transformer power formula zero backflow power zone variable-frequency optimization |
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