Overcurrent system suppression measures for HVDC transmission system

Abstract. LCC-HVDC technology, an essential Commutated Converter based on High Voltage Direct Current, is extensively employed in power system. However, because DC side overcurrent has the potential to seriously affect both system stability and equipment dependability, it has long been the focus of LCC-HVDC systems. This research presents an effective overcurrent suppression technique for the LCC-HVDC side overcurrent. This work first explains the damage caused by DC side overcurrent. A defect or abnormal situation in an LCC-HVDC system can result in DC side overcurrent, which can have a number of negative effects, including equipment damage, power grid instability, and system collapse. Therefore, it is imperative to address the DC side overcurrent issue in order to ensure the system's reliability and safe functioning. The overcurrent suppression method is then presented in this study. This research then presents an overcurrent suppression technique. This approach is predicated on a thorough examination of the properties of DC side pass current in conjunction with power electronic device regulation. First, the primary cause of the DC side pass current is identified by examining its source. Next, a control algorithm is created that has real-time monitoring and suppression capabilities for the DC side overcurrent. The method is able to precisely detect the overcurrent and promptly implement the necessary control measures.This study contrasts simulated trials carried out in the actual LCC-HVDC system with the conventional overcurrent suppression technique. The results show that the proposed overcurrent suppression strategy improves stability and reaction speed while effectively suppressing the DC side overcurrent. Furthermore, the method exhibits strong resilience and flexibility across a range of malfunction scenarios and operational contexts.