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能源资源与负荷中心极不均衡的分布态势决定了我国需要建设大规模远距离的电能输送通道,高压直流输电技术在我国电网中得到了大规模应用,目前已建设高压直流输电线路20余条[1]。换流阀冷却系统的可靠性已成为影响整个直流输电安全运行的重要因素,据不完全统计,在2011年11月之前,南方电网公司4条直流输电系统因换流阀冷却系统故障而发生的单双极直流闭锁事故有22起[2,3,4],换流阀水冷喷淋水水质破坏问题一直是换流阀冷却系统故障的一个重要因素。
换流阀水冷喷淋水一旦结垢,会降低整个阀冷系统的冷却效能,换流阀的热量不能完全散发引起换流阀跳闸,整个直流输电线路停运,造成严重的电力事故。随着电力电子器件和控制技术的进步,基于电压源变流器的柔性直流输电(VSC-HVDC)系统已经成为直流输电系统发展的主流趋势[5]。为确保柔性直流输电的安全稳定运行,解决换流阀水冷喷淋水水质破坏问题尤为重要。
Optimization Research on Reverse Osmosis Treatment Technology for Flexible DC Valve Cooling Spay Water
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摘要:
[目的] 文章旨在解决换流站阀冷喷淋水水质破坏导致系统故障问题。 [方法] 分析了水质破坏机理及常规直流换流阀冷却喷淋水对管路破坏的过程,研究提炼出水处理内容。 [结果] 研究成果为柔性直流换流阀冷却喷淋水提出一种优化反渗透处理技术方案,可高效去除喷淋水中破坏管路的各个因素。 [结论] 该处理工艺出水基本杜绝喷淋水在冷却塔盘管外壁结垢及其他水质破坏的问题,确保整个阀冷系统可靠的冷却效能和稳定的运行。 Abstract:[Introduction] The paper aims to solve the problem of system failure caused by quality destruction of valve cooling spray water in converter station. [Method] This article analyzed the water quality damage mechanism, analyzed the process of LCC valve cooling spray water to the pipeline damage, researched out the content needed to be removed. [Result] Propose an optimization reverse osmosis treatment plan for VSC valve cooling spray water. Efficient removal of the various factors in the spray water that damage pipeline. [Conclusion] The spray water will not scale on the cooling coils or generate other damage by treated with the solution, and ensures reliable cooling performance and stable operation of the valve cooling system. -
Key words:
- VSC valve /
- valve cooling system /
- spray water /
- reverse osmosis treatment /
- optimization
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