Calculation method and system for high-voltage direct-current transmission system rapid power-up capability

A technology of power capability and power transmission system, applied in AC network circuits, circuit devices, power transmission AC networks, etc., can solve problems such as large time consumption, system voltage reduction, voltage stability problems, etc., to avoid simulation calculations and ensure calculation accuracy. , the effect of improving the solution speed

Active Publication Date: 2018-12-18
STATE GRID ECONOMIC TECH RES INST CO +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Calculation method and system for high-voltage direct-current transmission system rapid power-up capability
  • Calculation method and system for high-voltage direct-current transmission system rapid power-up capability
  • Calculation method and system for high-voltage direct-current transmission system rapid power-up capability

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Embodiment 1

[0058] like figure 1 As shown, the calculation method of the high-voltage direct current transmission system provided by the present invention to quickly increase the power capacity includes the following steps:

[0059] 1. According to the initial situation of the AC-DC system in the HVDC transmission system, the initial state parameters of the AC-DC system are obtained; among them, the initial state parameters of the AC-DC system include: AC equivalent system voltage and equivalent impedance at the sending and receiving end, relative inductive voltage drop, forward voltage drop of converter valve, rated firing angle of rectifier station, rated arc-extinguishing angle of inverter station, initial active power, rated DC voltage and current, DC line resistance, arc overlap angle of rectifier station and inverter station, rectifier station and the reactive power consumed by the inverter station, the reactive power provided by the filter of the rectifier station and the inverter ...

Embodiment 2

[0110] The present invention also provides a computing system for rapidly increasing the power capability of a high-voltage direct current transmission system, including: the computing system includes:

[0111] An initial state parameter acquisition module, according to the initial situation of the AC-DC system in the HVDC power transmission system, obtains the initial state parameters of the AC-DC system, and the initial state parameters include initial active power;

[0112] A steady-state parameter calculation module, which calculates the steady-state parameters of the AC-DC system according to the set power boost command value, wherein the steady-state parameters include the AC system voltage on the rectifier side, the DC voltage on the rectifier side, the AC system voltage on the inverter side, and the inverter side. Transformer-side DC voltage, wherein the rectification-side AC system voltage and rectification-side DC voltage are the sending-end AC-DC system voltages, and...

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PUM

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Abstract

The invention relates to a calculation method and a system for rapidly increasing power capability of a HVDC transmission system, comprising the following steps: 1) according to the initial conditionof an AC/DC system in the HVDC transmission system, obtaining an initial state parameter of the AC/DC system, wherein the initial state parameter comprises an initial active power; 2) set a power boost command value and calculate that steady-state parameters of the AC/DC system; 3) correcting the power boost command value based on the trigger angle of the rectify side and the AC/DC system voltageof the transmitting and receiving terminal, and entering step 2) for iteratively calculating the change of the steady-state parameters of the AC/DC system; Until the AC system voltage and trigger angle of rectifier meet the preset requirements, the DC system fast power-up capability is obtained, wherein, the DC system fast power-up capability refers to the difference between the final DC power-upcommand 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 李晖索之闻于钊刘明松李俊霖盖振宇王峤王海潜张文嘉朱寰黄阮明
Owner STATE GRID ECONOMIC TECH RES INST CO
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