| 基于直流调制度的特高压柔直阀组在线投入策略 |
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| 作者姓名： | 鲁江 董云龙 张庆武 甘宗跃 卢宇 田杰 |
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| 作者单位： | 南京南瑞继保电气有限公司,南京南瑞继保电气有限公司,南京南瑞继保电气有限公司,中国南方电网有限责任公司超高压输电公司,南京南瑞继保电气有限公司,南京南瑞继保电气有限公司 |
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| 基金项目： | 国家重点研发计划资助项目（2016YFB0900602） |
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| 摘 要： | 为简化阀组在线投入的顺控操作流程,特高压柔性直流输电系统要求柔直阀组具备在直流侧短接状态下完成在线投入的能力。首先,阐述基于混合型MMC特高压柔直阀组的在线投入过程,分析过程中的关键技术难点;然后,结合混合型MMC阀组控制特性及直流侧等效回路,对在线投入过程的关键策略进行详细分析,提出基于直流调制度的特高压柔直阀组在线投入策略实现方案,该策略方案在直流侧短接状态下可实现柔直阀组平稳解锁、直流电流快速转移、旁路开关可靠分断以及子模块均压等关键目标;最后,通过实时数字仿真平台试验,验证所提策略具有良好的控制性能。
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| 关 键 词： | 特高压柔性直流 混合型模块化多电平换流器 阀组在线投入 高低压阀组串联 直流调制度 |
| 收稿时间： | 2020/9/9 0:00:00 |
| 修稿时间： | 2020/10/25 0:00:00 |
Valve group online entry strategy for VSC-UHVDC system based on DC modulation degree |
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| Authors: | LU Jiang DONG Yunlong ZHANG Qingwu GAN Zongyue LU Yu TIAN Jie |
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| Affiliation: | NR Electric Co Ltd,NR Electric Co Ltd,NR Electric Co Ltd,EHV Power Transmission Company,China Southern Power Grid,NR Electric Co Ltd,NR Electric Co Ltd |
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| Abstract: | To simplify the sequence control process, VSC-UHVDC transmission system requires that VSC valve group has the ability to complete the valve group online entry under DC side short circuit. ForSthis requirement, firstly, the online entry key points for VSC-UHVDC valve group based on hybrid MMC are described. Then, combined with the control characteristic and DC side equivalent circuit of hybrid MMC, the key strategies of valve group online entry are analyzed and the implement scheme based on DC modulation degree is proposed. These control objectives can be realized including smooth converter deblock under DC side short circuit, fast DC current transfer, reliable bypass switch breaking and effective sub-module voltage balance. Finally, the effectiveness of the valve group online entry strategies is verified by the real-time digital simulations. |
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| Keywords: | VSC UHVDC hybrid modular multi-level converter valve group online entry dual converter in series |
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