长控制链路延时特征下柔性直流输电系统动态性能改善方法

发布时间：2018-04-20 08:48

  本文选题：相位校正 + 稳定性　； 参考：《电网技术》2017年10期

【摘要】：高压柔性直流输电系统因控保装置多、不同控保装置间通讯数据多等原因,控制链路延时远大于1个控制周期。控制链路延时的大幅度增加恶化了此类系统的动态响应特性,降低了高压柔性直流输电系统的交流故障穿越能力。提出了一种不影响幅频特性的相位校正方法,分析了该相位校正方法的适用性及应用限制。将上述相位校正方法应用到鲁西背靠背异步联网工程柔性直流单元的控制系统稳定性分析中,建立了系统在静止坐标系下的精确等效分析模型,分析比较了相位校正前后系统稳定裕度。结果表明,将相位校正方法应用在正序控制后,系统幅频特性不变,正序信号相频特性整体超前固定角度,负序相频特性则整体滞后相同角度。基于实际工程控保装置的实时仿真和工程验证表明,合理配置相位校正值可改善系统的交流故障穿越特性,提高故障穿越成功率。
[Abstract]:The control link delay of HVDC transmission system is much longer than one control period because of many control and protection devices and many communication data among different control and maintenance devices. The large increase of control link delay deteriorates the dynamic response characteristics of such systems and reduces the AC fault traversal capability of HVDC systems. A phase correction method which does not affect the amplitude and frequency characteristics is proposed. The applicability and application limitation of the phase correction method are analyzed. The above phase correction method is applied to the stability analysis of flexible DC unit in Luxi back-to-back asynchronous interconnection project, and the exact equivalent analysis model of the system in static coordinate system is established. The system stability margin before and after phase correction is analyzed and compared. The results show that when the phase correction method is applied to the positive sequence control, the amplitude-frequency characteristic of the system is invariant, the phase frequency characteristic of the positive sequence signal is in advance of the whole angle fixed, and the phase frequency characteristic of the negative sequence signal lags behind the same angle as a whole. The real-time simulation and engineering verification show that the phase correction value can improve the AC fault traversing characteristic of the system and increase the success rate of fault traversing.
【作者单位】： 直流输电技术国家重点实验室(南方电网科学研究院有限责任公司);
【分类号】：TM721.1
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本文编号：1777088