In the research of control strategy of upgrading Liaoning power grid automatic voltage control system, taking the power grid reality into consideration, this paper improves the method of partitioning and the principle of choosing the key node and controllable pilot node. To solve the problems such as: one needs to artificially determine the number of partitions, it is possible that isolated node be as a whole partition, and there are still few unreasonable nodes in partition results, a pre-partition-correction method based on conditional clustering analysis is proposed. The voltage-sensitive critical node, together with controllable pilot node, be as monitoring nodes which are mainly monitored and regulated in each partition. And this paper also proposes the control principle of the critical node. After testing the method by applying it in the 220 kV system of Liaoning power grid, a desired result which meets the work requirements is got.%在辽宁电网自动电压控制系统升级的控制策略研究中，对于辽宁电网软分区方法、中枢点以及主导节点的选择等问题结合电网实际情况进行改进。针对分区过程中出现的需要认为确定分区个数、存在孤立节点单独作为分区以及分区后个别节点分区结果不合理等问题，提出了基于条件聚类的预分-校正软分区方法。而对于区域中对于电压变化敏感的临界节点，将其与可控主导节点共同作为各区域重点监视与调控的监视节点，并给出其控制原则。通过辽宁电网220 kV系统对上述方法的应用验证，效果良好，满足工作要求。
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