This study proposes a methodology for assessing the availability of voltage source converter high-voltage direct current (HVDC) grids based on the enumeration methodology of contingency analysis with N − 2 criteria and makes contributions in the computation of remedial actions and the definition and computation of reliability indices applied for HVDC grids. Thus, this study proposes the computation of remedial actions based on an optimal power flow, looking to maintain power exchanges between HVDC and high-voltage alternating current grids, when a contingency occurs on the HVDC grid and converter stations or HVDC lines are out of their operating limits. On the other hand, an HVDC grid has the function of injecting and extracting power from AC interconnected zones, and then traditionally used nodal reliability indices must be modified to indices that reflect the performance of the HVDC network to fulfil its function of interconnection of systems. This study defines two sets of availability indices applicable to HVDC grids: (i) loss of power and energy extracted from the DC grid to the AC zones and (ii) loss of power and energy injected to AC zones from the DC grid. The proposed methodology is applied to perform the availability assessment of the CIGRE B4 DC grid test system and the results are presented.

本研究提出了一种基于N的权变分析枚举方法的评估电压源转换器高压直流（HVDC）电网可用性的方法 − 2条标准，并为补救措施的计算以及应用于HVDC电网的可靠性指标的定义和计算做出了贡献。因此，本研究提出了一种基于最佳功率流的补救措施的计算方法，旨在在HVDC电网发生意外事故且换流站或HVDC线路不在其范围内时，维持HVDC与高压交流电网之间的电力交换。操作极限。另一方面，HVDC电网具有从交流互连区域注入和提取电力的功能，然后必须将传统使用的节点可靠性指标修改为反映HVDC网络性能的指标，以实现其系统互连的功能。这项研究定义了适用于HVDC电网的两组可用性指标：（i）从直流电网提取到交流区域的功率和能量的损失，以及（ii）从直流电网注入到交流区域的功率和能量的损失。将所提出的方法应用于CIGRE B4 DC电网测试系统的可用性评估，并给出结果。