The Analysis And Application Of Automatic Voltage Control Of Liaoyang Regional Power Grid

In recent years, with the continuous development of China’s grid conformation, China’s electricpower system has become the world’s highest voltage level, the largest regional power gridinterconnection. Large-capacity, long-distance transmission and large regional power gridinterconnection become a major feature of China’s power grid. In the situation, fluctuations in thepower transmission will cause a substantial change of grid voltage. The effective control of voltageand reactive power becomes a serious problem.To improve the ability of controlling of power grid for power dispatchers, and to achieve theoptimal allocation of resources between WAN, it’s difficult to meet the requirements only by relyingon artificial experience to adjust the voltage and reactive power. Along with the level of gridscheduling automation, information and interaction increased remarkably, to achieve Closed-loopmanagement of voltage and reactive power in the scheduling control center build Automatic VoltageControl (AVC) system has become a consensus.In this paper, it elaborates the reactive voltage control technology and analyses the key algorithmof regional power grid based on the grid structure and the operation of the voltage operation gridconstruction in Liaoyang. And it proposes the basic control mode and control strategy of the AVCsystem which is accords with the practice of Liaoyang regional power grid. Utilizing ‘telemetry,remote communication, remote control and remote regulating’ function of SCADA system, and usingthe computer and network communication technology, we can monitor the grid voltage and reactivepower timely, do online analysis and calculation, carry out the real-time optimal closed-loop control.Under the condition of keeping the power grid security to constraint optimization of reactive powertide operation, we can make the regional power grid voltage quality better and the least network loss.Practical application shows that the automatic voltage control system greatly reduces the laborintensity of the attendants, avoids the reactive power caused by long distance and multi-stagetransmission transformer, and reduces the power grid network loss in Liaoyang district effectively. Itpossesses significant economic benefit and broad market prospects.