随着可再生能源的占比日益增大、火电机组装机容量及其运行小时数日益减少,大型枢纽城市电网负荷中心的电源“空心化”现象日趋突出,给二级电压的区域无功电压控制带来了新的挑战。为此,本文提出了电源“空心化”电网的协调二级电压控制优化方法。相对现有研究方法,新方法具有以下特点:(1) 将区域内所有可控发电厂的高压母线泛化为电压主导节点,并以高压母线电压与其理想电压的偏差平方和最小为目标来实现二级电压控制的优化；(2) 区分了同级和上下级分区之间的协调关系,新增上下级区域之间关口无功和关口电压协调变量及其理想偏差控制目标。新方法通过主导节点的泛化和上下级区域关口无功电压的协调,提升了电源“空心化”负荷中心电网二级电压控制效果。最后,以标准算例组合系统以及我国实际数据,仿真验证了论文所提方法的有效性。

With the increasing proportion of renewable energy and the decreasing installed capacity and operating hours of thermal power units, the phenomenon of "hollowing out" of power supply in load centers of power grids in large hub cities is becoming more and more prominent, which brings new challenges to regional reactive voltage control of secondary voltage. Therefore, a coordinated secondary voltage control optimization method is proposed for the "hollowing out" power grid. Compared with the existing research methods, the new method has the following characteristics: (1) The high-voltage busbar of all controlled power plants in the region is generalized to the voltage dominant node, and the goal is to minimize the square sum of the deviation between the high-voltage busbar voltage and its ideal voltage to achieve the optimization of the secondary voltage control; (2) The coordination relationship between the level and the upper and lower levels is distinguished, and the coordination variables of the threshold reactive power and threshold voltage between the upper and lower levels are added as well as the ideal deviation control objectives. The new method improves the secondary voltage control effect of the power supply "hollowing out" load center network through the generalization of the leading node and the coordination of the reactive voltage of the upper and lower regional gateways. Finally, the effectiveness of the proposed method is verified by simulation with the standard example combined system and the actual data in China.

TM732???????