论文部分内容阅读
电压的稳定极限随运行状态变化，且远低于正常运行时的安全水平。因此，分析基于电压安全水平约束的节点负荷安全域，以便将各节点负荷和无功补偿限制在该域内，保持电网电压安全，将更具实际意义。基于戴维南等值模型的分析发现，的确存在这样的负荷安全域。故基于线路模型、参数和额定电压值，分析得到了线路两端的负荷安全域，即偏心圆弧与P、Q正轴围成的区域；通过变压器两侧线路负荷安全域的匹配，可得到电网各节点的负荷安全域；通过变比调节，可调整低压侧线路两端的负荷安全域；无功补偿则视为负荷调节，以适应高压侧线路末端的负荷安全域。算例分析验证了该负荷安全域思路的可行性。该研究对配电网运行与无功规划具有实际意义。“,”Voltage stability limits will vary with running states, and far below the normal safety level. Therefore, the analysis of node load security domains based on voltage security level constraints so that the load of each node and reactive power compensation are limited to the region, to maintain grid voltage security, will be more meaningful. The analysis based on Thevenin equivalent model found the load security domains are existed indeed. So, based on line models, the parameters and the rated voltages, the load security domains of both ends of lines had been analyzed to get, that were, enclosed by eccentric arc and P and Q positive axis. By matching of the security domains on both sides of transformers, the load security domains of each node in grid had been obtained; by adjusting the ratio, adjustable the load security domains at the line ends of low-voltage side; reactive power compensation was deemed load adjusted to accommodate the load security domains at the line end of high-voltage side. Case studied to verify the feasibility of load security domain analysis. The study has practical significance distribution grid operation and reactive planning.