Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of direct current frequency limiter control method

A control method and limiter technology, applied in AC network circuits, reactive power adjustment/elimination/compensation, reactive power compensation, etc., can solve DC power fluctuations, affect transient voltage stability of AC systems, voltage reduction, etc. problems, to achieve the effect of improving transient voltage stability

Active Publication Date: 2020-06-30
CHINA ELECTRIC POWER RES INST +3
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When a short-circuit fault occurs in the AC system, it will cause the power flow transfer in a local area, and then cause the voltage drop and DC power fluctuation in the local area. During the DC power recovery period, the frequency fluctuation of the AC system will cause the frequency limit controller to operate, resulting in DC power changes can affect the transient voltage stability of AC systems

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of direct current frequency limiter control method
  • A kind of direct current frequency limiter control method
  • A kind of direct current frequency limiter control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0047] The present invention provides an embodiment of the DC frequency limiter control, taking the Chu-Sui UHV DC transmission system 8-machine 4-line operation mode island sending power model as an example, collecting the data of the Chu-Sui DC island power grid, and using the electromechanical transient simulation of the power system The software PSD-BPA establishes the power flow steady-state simulation calculation model and the electromechanical transient simulation calculation model of the island power grid at the DC sending end.

[0048] (1) Obtain the frequency f of the island power grid;

[0049] When the 500kV line of Xiaowan-Chuxiong converter station has a three-phase permanent short circuit fault, the system detects the bus frequency f of Chuxiong converter station;

[0050] (2) Judging whether the frequency f of the island power grid exceeds the limit range of the frequency limiter, if so, then perform step (3), if not, then return to step (1);

[0051] Set the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a DC frequency limiter control method, which comprises the following steps: obtaining a frequency f of an isolated power grid; judging whether the frequency f of the isolated power grid exceeds a limit range of a frequency limiter or not; determining a reactive power Q<s> which is absorbed from an AC system by a rectifier station; determining a reactive power variation rate K absorbed from the AC system by the rectifier station; and controlling the frequency limiter according to f and K. The method provided by the invention can ensure that a frequency limit controller can develop the advantages of being flexible and quick to adjust and high in accuracy when an AC or a DC of a sending-end system is in power imbalance disturbance, and play a positive role in stabilizing the frequency after system disturbance; meanwhile, the risk of a voltage drop of an AC / DC system after an AC system failure is lowered; and the transient voltage stability of the DC sending-end isolated power grid is improved.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a control method for a DC frequency limiter. Background technique [0002] Due to the reverse distribution of my country's energy production capacity centers and electricity load centers, it is determined that my country's future power transmission pattern will be large power sources, large power grids, and large-capacity power transmission. The advantages of direct current transmission in long-distance power transmission will play an important role in west-to-east power transmission and national networking. At present, the rated capacity of the ±800kV Chusui UHV DC that has been put into operation in my country is 5000MW. Its supporting hydropower plant is far away from the converter station, and the power is sent to the load center by the DC sending-end island operation mode. [0003] In the island power grid at the sending end, the moment of inertia of the generator and the short...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/18
CPCH02J3/00H02J3/18H02J2203/20Y02E40/30
Inventor 吕思卓郑超李惠玲刘洪涛
Owner CHINA ELECTRIC POWER RES INST