Research On Reactive Power And Voltage Stability Of Qinghai Power Grid Considering Large Scale Photovoltaic Power Generation Access

During the "Thirteenth Five-Year Plan " period,the scale and transmission capacity of Qinghai Power Grid continued to expand,and the proportion of photovoltaic power generation in power supply structure has been continuously improved,resulting in large-scale investment of power electronic devices in the power grid,making the control state of the unit and system increasingly complex.Since large-scale photovoltaic power generation is mainly used in remote areas with a single network structure and weak electrical strength,the grid structure of the grid-connected area is relatively weak.The photovoltaic grid-connected power generation technology and the long-distance transmission power generation require a large amount of reactive power.Large-scale photovoltaic access is likely to lead to the problem of reactive voltage stability in Qinghai Power Grid.In this paper,BPA software is used as the simulation calculation tool.The two typical operation modes of Qinghai Power Grid in 2016 are taken as research objects.Through theoretical derivation,experimental verification and simulation analysis,the voltage stability problem of the reactive power in Qinghai Power Grid with large-scale PV accessing has been studied.The following research contents are mainly completed:carried out power flow calculation and reactive power analysis,and comprehensively evaluate the reactive power balance of Qinghai Power Grid reactive power compensation under the planning scheme.,and formed the reactive power compensation optimization switching scheme;Carried out transient voltage stability check of malfunction in 750kV and 330kV power lines,simulated and analyzed various accident forms and consequences that may lead to voltage stability problems;studied the influence of the reactive power compensation in Qinghai Power Grid with photovoltaic power fluctuating,formed a reactive power compensation configuration proposal considering photovoltaic access;used the whole process simulation program to simulate the dynamic process of photovoltaic power,analyzed the adaptability of Qinghai power grid to photovoltaic power fluctuations;recommended the optimal parameters of dynamic reactive power compensation,and evaluated the application effect of dynamic reactive power compensation in Qinghai Power Grid.