特高压交直流接入对江西电网短路电流的影响研究

详细分析了特高压交直流接入后江西电网短路电流水平，研究了目前应用最广泛的短路电流限制措施。对江西电网短路电流交流分量达到开断遮断电流90%的节点进行直流分量衰减时间常数计算，研究了江西电网短路电流直流分量对断路器开断能力的影响。分析了江西电网短路电流增加的原因，并提出了应对短路电流超标问题的措施和方法。研究结果为未来2-3年特高压交直流将接入江西电网的规划提供理论依据和技术支持。

Study on the Effect of AC/DC UHV on Short - circuit Current in Jiangxi Power Grid

The short- circuit current level of Jiangxi power grid is analysized when it is supplied by the AC / DC UHV by PSASP, The most widely used short-circuit current limitation measures are studied in depth. The DC component decay time constant of the node with 90% breaking breaking current of Jiangxi power grid is calculated. The influence of the DC component of the short circuit current on the breaking capacity of the circuit breaker is studied. The reasons of the short-circuit current in Jiangxi power grid increasing are studied. The measures and methods of dealing with the excessive current are proposed applied in Jiangxi power grid with UHV. The results provide the direction to high-voltage transmission plan which AC/DC UHV will be connected to Jiangxi power grid in the next 2-3 years.