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Dispatch of reactive power compensators in transmission grids

机译：在电网中分配无功补偿器

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The phase-out of conventional power plants reduces the reactive power reserve from synchronous generators in transmission grids. Operational concepts need to be adapted to integrate reactive power compensators such as STATCOMs into voltage control schemes. This paper presents a novel two-stage optimization method for determining reactive power schedules, distinguishing manual and automatized control variables. The first stage optimizes the reactive power dispatch iteratively for the considered period using successive linear programming based on continuous variables due to relaxed integrality conditions. Afterwards, an embedded genetic algorithm re-discretizes integer variables. The second stage determines pareto-optimal reactive power schedules based on grid losses and switching frequency. Therefore, points of time are modeled as nodes and loss energies between two time-coupled points of time are modeled as arcs in a directed acyclic graph. The investigated scenario indicates that a high number of switching actions for passive compensators, such as shunt capacitors or reactors, is not necessary. Furthermore, it becomes apparent that the automated control of flexible devices like STATCOMs enables a reduction of active power losses.
机译：常规电厂的逐步淘汰减少了输电网中同步发电机的无功储备。需要调整操作概念，以将无功功率补偿器（例如STATCOM）集成到电压控制方案中。本文提出了一种新颖的两阶段优化方法，用于确定无功功率计划，区分手动控制变量和自动控制变量。第一阶段使用基于松弛积分条件的连续变量的连续线性规划，在考虑的时间段内迭代优化无功功率分配。之后，嵌入式遗传算法重新离散整数变量。第二阶段根据电网损耗和开关频率确定最优的无功功率计划。因此，在有向无环图中，将时间点建模为节点，将两个时间耦合的时间点之间的损耗能量建模为弧。研究的场景表明，无源补偿器（例如并联电容器或电抗器）的大量开关动作是不必要的。此外，很明显，对诸如STATCOM之类的柔性设备的自动控制可以减少有功功率损耗。

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