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设计了一种基于精简指令集处理器(advanced RISCmachine,ARM)的时变限值无功补偿控制器。该控制器采用ARM处理器作为控制单元,通过网络控制芯片DM9000A实现控制器与数据采集与监控系统之间的数据通信,从而取代传统的A/D信号采集方式。在提出的控制算法中,以变压器分接头和电容器的最大动作次数作为约束条件,根据电网各时段的波动水平,使用分形和聚类算法实现电网补偿时段的划分。通过最优潮流算法计算出电网中各节点的最优节点电压和最优无功功率,并根据变压器的电压步长、电容器的容量计算出各个时段的电压和无功功率的上下限值,从而得到使用新限值的9区图判据。根据电网实时电压、无功功率,ARM使用9区图判据来判断当前电网工作点所处的工作区域,从而执行相应的补偿方案。实际运行的数据表明该装置降低了变压器分接头和电容器的动作次数,延长了变压器和电容器组的使用寿命。
A time-varying and limited reactive power compensation controller based on advanced RISCmachine (ARM) is designed. The controller adopts ARM processor as the control unit, and realizes the data communication between the controller and the data acquisition and monitoring system through the network control chip DM9000A, thus replacing the traditional A / D signal acquisition mode. In the proposed control algorithm, the maximum number of transformer taps and capacitors is taken as the constraint condition, and the division of grid compensation period is achieved by using the fractal and clustering algorithm according to the fluctuation level of the grid. The optimum node voltage and the optimal reactive power of each node in the power grid are calculated by the optimal power flow algorithm. Based on the voltage step of the transformer and the capacity of the capacitor, the upper and lower limits of voltage and reactive power of each period are calculated. Get the 9-zone graph criterion using the new limits. According to the grid real-time voltage and reactive power, ARM uses the 9-zone map criterion to determine the working area where the current grid working point is located, so as to execute the corresponding compensation scheme. Practical data show that the device reduces the number of transformer tap and capacitor action, extending the service life of the transformer and capacitor banks.