Application Of Embedded System In Reactive Power Optimization Of Power Systems

With the rapid development of economy, residential and industrial electricity consumptioncontinues to grow, and people have higher requirements for power quality.Voltage and reactivepower are important parameters for power quality and have a major impact on the stableoperation of the grid. Therefore, the voltage and reactive power compensation control is animportant research topic in the automatic control on power system. The power system voltageand reactive power are adjusted via regulating transformer stalls and capacitor banks. Therefore,reliable and effective voltage and reactive power compensation controller plays an importantrole on the reactive power optimization in power system.In order to implement reactive power compensation control commodiously and effectivly,this paper presents ARM-based reactive power compensater with time variable limits.Processor is Marvell’s PXA270. Wince is used as the soft platform of controller. In datacommunication aspect, DM9000A network control chip is used to implement thecommunication between server and SCADA. Through this way, the traditional A/D moduleacquisition is replaced, so the connection between controller and exertenal device issimplified. In control strategy aspect, according to the load level, the whole time intervals in aday are divided into multi-time intervals by fractal and clustering algorithms with theconstraints of the maximum allowable daily operating times (MADOT) of transformer orcapacitor. The optimal node reactive power (Qopt) and the optimal node voltage (Uopt) of eachintervals are calculated by Optimal Power Flow (OPF) algorithm, and then the lower and upperlimits of voltages and VARs of time intervals are calculated by voltage step of the transformer,capacity of the capacitor, the time intervals and the grid optimal data. According to the real-timevoltage and reactive power and the nine-zone criterion with the new limits, ARM determineswhich zone the operating point is located in, and then the corresponding compensation schemeis operated.This paper aims to ensure that the reactive power optimization is more reasonable. Thetime intervals of compensation devices such as transformers, capacitors are determined by theload fluctuations, and then the compensation limit values of each time intervals can be obtained.The reactive power compensation of grid is controled via this cotrol strategy. Practical application shows that the data transmission can be relized stably and reliably by the networkcommunication. Experimental result shows that the compensation control strategy with timevariable limits can ensure that the transformer taps and the capacitor bank occur are operatedin periods of rapid change of power load. The life of the transformer and capacitor banks canbe extended via adjusting the MADOT of the compensation equipment,...