直流接地极结合均流系统的计算模型与求解

Calculation Model and Solving Method of HVDC Grounding Electrode With Average-current System

当接地极址范围较小时,接地极的设计往往难以达到设计指标的要求,而均流系统在理论上是一种能够提高接地极性能的新技术。分析了直流接地极的可行性因子,并在此基础上研究了直流接地极结合均流系统的计算模型,该模型不仅适用于常规接地极,而且对多换流站共用接地极也具有通用性。通过求解该模型,可找出优化的均流电阻组合方案,使接地极的性能得到优化。仿真算例验证了该方法的正确性以及对极址利用的充分性,在该算例中结合均流系统后的接地极跨步电压减小了21%。

The ground performance of electrode is usually hard to satisfy the requirements in standard when the electrode site is small. Average-current system can solve this problem to some extent. The feasibility factors of grounding electrode and the calculation model of grounding electrode with average-current system were studied in the paper. The model is not only suitable for regular grounding electrode, but also for commonly used grounding eleclrode. The optimized average-current resistances can be obtained through solving the model, which will optimize the grounding performance greatly. Finally, the validity and effectiveness of the presented method are verified through numerical example. In the example the step voltage is reduced by 21% with the average-current system used.