Power distribution network voltage control method and system based on load transfer and energy storage regulation

Abstract

The invention discloses a power distribution network voltage control method and system based on load transfer and energy storage regulation. The method comprises the steps of carrying out load flow calculation based on topological parameters of a power distribution network, and obtaining the sensitivity of the voltage of each node of the power distribution network to the active and reactive output of the node; sorting each branch line according to the sensitivity, constructing a load transfer model of each branch line based on the hybrid Petri network, adjusting the main bus voltage until the main bus voltage is within a safe range through flexible transfer of branch line loads, if the main bus voltage is not safe, constructing a system prediction control model according to the sensitivity, and adjusting each distributed energy storage to realize optimal control of the bus voltage, if the solution still cannot be solved, calculating the water abandoning amount of each branch line according to the sensitivity, and performing sequential water abandoning on each hydroelectric power generation unit according to the water abandoning amount. According to the invention, the two-stage optimization control of the bus voltage regulation is realized, and the reliability and economy of the bus voltage regulation are ensured.

Description

technical field [0001] The present invention relates to a distribution network voltage control method and system including large-scale hydropower, in particular to a distribution network voltage control method and system based on the combination of load transfer and energy storage regulation. Background technique [0002] As a renewable energy source, hydropower not only has low cost of power generation, quick start-up of power generation, energy saving and emission reduction, and flexible operation, but also can control flooding, provide irrigation water, and improve river channels. my country has gradually established many large-scale hydropower station groups across river basins and regions. [0003] However, the active output of the hydropower station depends on the runoff of the river, which has great uncertainty. During the wet season, most of the hydropower groups operate at full load, and because the grid structure is relatively weak, it is easy to cause overvoltage...

AI Technical Summary

Problems solved by technology

When the motor is running at high speed, if the power tube of the full-bridge inverter fails, the diode in the inverter will gradually become a three-phase uncontrollable rectifier, which will lead to uncontrollability of the water turbine unit. If the corresponding voltage is not adopted Control measures will lead to increased equipment loss, increased risk of equipment failure, and even serious consequences of system crashes and decommissioning

Images