Studies On Reactive Power Optimization Of Shandong Power Grid

As with the growing of electricity consumption, the infusing of power from other provinces as well as the expansion of offshore wind farms’synchronization scale, Shandong power grid needs to upgrade its voltage controlling ability to catch up with the system development. Under such circumstances, this paper research on the critical problems of the programming on voltage adjustment by reactive power compensation, planning to evaluate the voltage stability level of the whole grid by analyzing the system reactive power, stability margin and ability of disturbance resistance based on the reactive power configuration and scheming of Shandong power grid. On that basis, this project aims to quantify the range of the system generators leading factors and show the coordination and configuration principles of high voltage shunt reactor and low voltage shunt reactor, the way to adjust voltage of the main transformer as well as the configuration principles of the substation capacitive reactive power. This project also achieves to make clear the optimal locations and capacities of the dynamic reactive power compensation equipments of the grid, via modeling reactive power planning optimization problem and looking for feasible timesaving optimization algorithms. This report includes:1) Research on the voltage safety level of the Shandong power grid.Via static voltage stability local index and static voltage stability margin power index, give out the sort of stability about Shandong backbone 500kV substation bus voltage. Choose some weak nodes in the sort of list, and make use of BPA simulation tools, simulate the typical faults (three phase short circuit fault) occurring near the weak nodes. With the weak node voltage transient response, the evaluation of the safety of the grid voltage is given. At the same time, the change of stable index before and after the use of optimal decision-making, indirect evaluates the rational of reactive power compensation planning decisions.2) Research on the determination of the generators’leading factor range, the coordination and configuration of high voltage shunt reactors and low voltage shunt reactors as well as the capacitive reactive power configuration.By solving dynamic reactive power optimization problems of the system, figure out the optimal reactive power outputs during low electricity load periods on the guarantee of the safe and economical running of the system. On the basis of that, as well as considering factors including requirements on generators running on leading factors, limited power frequency over voltage and reactive power reservation of the system, determine the leading factor range the generators should possess, the capacity of the capacitive or inductive reactive power compensation equipments and further determine the type of the compensation equipments, whether they are high voltage shunt reactors or low voltage shunt reactors, by economic efficiency analysis.3) Research on the dynamic reactive power compensation planning of the Shandong power gridBased on the researches above, according to the low voltage stability margin and weak control ability with shunt capacitors, reactors and OLTC as the only voltage regulation equipments, adding dynamic reactive power compensation equipments to the system should be considered. The location and capacity of these equipments is a complicated mixed integer nonlinear programming problem, which is to be solved by this part of the research by trying to find feasible optimization algorithm with high efficiency, on the basis of established reactive power planning model with multiple goals including voltage stability margin, the safety level and net loss. Further, revise the solution using digital simulation and figure out the optimal location and capacity of the dynamic reactive power compensation equipments of the Shandong power grid combining the voltage regulation regionalization of the grid.