不依赖状态估计的山区电网电压无功区域优化控制方法

Study on regionaloptimization control method of reactive power & voltage for the grid in mountainous areawithout state estimation

大量风、水电站接入山区电网,给山区电网带来了优良的无功资源。传统的自动电压控制(AVC)区域优化控制方法依赖状态估计数据,而山区电网状态估计数据常达不到实时控制的要求。传统的AVC区域优化控制方法无法在山区电网正常实施,且无法有效发挥这些风水电无功资源的作用,这导致山区电网电压控制困难、电压合格率偏低以及电网功率损耗较高。针对这一问题,依托现有的AVC系统,提出一种山区电网电压无功区域优化控制方法,无需依赖状态估计数据,按山区电网不同的电压无功控制目标给出对应的优化控制策略,并按优先级排序;提出10 kV母线电压控制目标值精确选取方法,根据供电区域内台区电压情况定期修正10 kV母线电压控制目标值。通过典型山区电网的实际应用验证所提方法的可行性和有效性。在不依赖状态估计数据的前提下,所提方法可以显著提升所应用山区电网的电压合格率、降低电网功率损耗并提供大量的无功动态支撑功率。

Many wind and hydropower stations are connected to the grid in mountainous areas, which brings excellent reactive power resources to the grid in the mountainous areas. The traditional regional optimization control method of Automatic Voltage Control(AVC) relies on state estimation data. The state estimation data of the grid in the mountainous area cannot frequently meet the real-time control requirements. The traditional AVC regional optimization control method can not be implemented generally in the grid in the mountainous area. Moreover, these wind and hydropower reactive power resources can not play an effective role. As a result, the voltage control of the grid in mountainous areas is difficult, the voltage qualification rate is low, and the power loss is high. To solve this problem, this paper proposed a novel regional optimization control method of reactive power & voltage for the grid in the mountainous areas based on the existing AVC system. It does not rely on state estimation data. According to the mountainous area grid’s different voltage and reactive power control objectives, the corresponding optimal control strategy is presented and sorted by priority. An accurate selection method of 10 kV bus voltage control target value is proposed and the control target value of 10 kV bus voltage is corrected periodically according to the station voltage in the power supply area. The feasibility and effectiveness of the proposed method are verified by the practical application of a typical mountainous power grid. Without relying on the state estimation data, the proposed method can significantly improve the voltage qualification rate of the applied mountainous power grid, reduce the power loss of the grid and, provide a large amount of reactive dynamic support power as well.