Research On Multi Units Coordinated Phase Advance Operation Method Used In Typical Daily Voltage Regulation Of Power Grid

Due to the characteristics of modern power grid,such as large capacity,ultra-high voltage and long-distance transmission,when the system is in a typical daily low load,due to the excess reactive power in the power grid,the voltage of some central points,especially 220kV bus,will be on the high side.It can be used to solve this problem.The main research contents and achievements are as follows(1)The principle of maximum leading phase depth is determined.The characteristics and differences of leading phase operation obtained by manufacturer,leading phase test and psd-bpa simulation are analyzed.It is pointed out that the current maximum leading phase depth should be obtained according to the current active power and leading phase test curve of leading phase unit when carrying out multi units coordinated leading phase operation.(2)The voltage regulation characteristics of single generator and multi generator leading phase are studied.This paper analyzes the actual operation data and leading phase depth of multiple units in a provincial power grid on a typical day,simulates and studies the voltage regulation characteristics of single unit leading phase operation and dual unit coordinated leading phase operation,and points out that multi unit leading phase needs reasonable reactive power distribution.(3)In this paper,a reactive power allocation model and solution method for multi units coordinated leading phase operation are proposed.Aiming at maximizing the overall safety margin of multi generator leading phase and similar safety margin of each unit,a multi generator coordinated leading phase reactive power allocation model is established,and a solution algorithm based on particle swarm optimization is designed.Finally,the feasibility of the above method is verified by a real power grid data.