Calculation method and system for rapidly increasing power capability of HVDC transmission system

Abstract

The present invention relates to a calculation method and system for rapidly increasing the power capability of a HVDC power transmission system, comprising: Step 1): According to the initial situation of the AC-DC system in the HVDC power transmission system, the initial state parameters of the AC-DC system are obtained, and the initial The state parameters include the initial active power; step 2): set the power boost command value, and calculate the steady-state parameters of the AC-DC system; step 3): modify the power boost command value based on the firing angle of the rectifier side and the voltage of the AC-DC system at the sending and receiving ends, and Go to step 2) iteratively calculate the change of the steady-state parameters of the AC-DC system; until the voltage of the AC system at the sending and receiving end and the firing angle of the rectification side meet the preset requirements, the rapid power increase capability of the DC system is obtained. Among them, the rapid power increase capability of the DC system refers to The difference between the final DC power boost command value and the initial active power of the AC-DC system.

Description

technical field [0001] The invention relates to a calculation method and a system for rapidly increasing power capability of a high-voltage direct current transmission system, and relates to the technical field of power transmission and distribution of power systems. Background technique [0002] High-voltage direct current transmission technology can greatly improve the long-distance and large-scale power transmission capacity of the power grid, and make the intensive and efficient development and large-scale allocation and consumption of clean energy in the west and north of my country possible. It is important for ensuring energy security and promoting the coordinated development of the eastern and western regions. significance. As of the end of 2017, UHV has completed "eight crossings and ten straight lines" and approved the "three crossings and straight line" projects under construction. The length of UHV projects completed and approved has reached 32,000 kilometers, and...

AI Technical Summary

Problems solved by technology

[0003] However, when the DC power is rapidly increased too much, since the DC filter and transformer taps cannot be adjusted in time, the system voltage at the sending end and the receiving end will decrease at the same time, which may be lower than the extreme minimum voltage that the system can withstand, further causing voltage stability problems ;In addition, due to the effect of DC control, the DC system may not be able to quickly increase to the set power command value, so it is necessary to set the rapid power increase value of the DC system reasonably

Since the electromagnetic transient simulation models used in each DC project are different, and the electromagnetic transient model itself takes a long time, when the system works at different operating points, it may take a lot of time only through simulation, and the DC system cannot be quickly obtained. rapid power boost capability

Images