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Lock-up control method for DC (Direct Current) power fluctuation of weak AC receiving power grid

A DC power, blocking control technology, applied in the control field, can solve the problem of the frequency collapse of the receiving end power grid, and achieve the effect of monitoring and avoiding the whole process, ensuring stable operation, and avoiding the frequency collapse of the power grid.

Active Publication Date: 2014-05-21
STATE GRID CORP OF CHINA +2
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a weak receiving-end grid that receives power through a large proportion of DC, taking a large power deficit for a long time without taking any measures may lead to the frequency collapse of the receiving-end grid

Method used

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  • Lock-up control method for DC (Direct Current) power fluctuation of weak AC receiving power grid

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the drawings.

[0026] Such as figure 1 , The present invention provides a method for blocking control of DC power fluctuations in a weak receiving end power grid. The control method includes the following steps:

[0027] Step 1: Determine the grid operation mode;

[0028] Step 2: Determine the fixed value of DC power fluctuation blocking control action frequency;

[0029] Step 3: Perform DC power fluctuation blocking control.

[0030] In the step 1, the grid operation mode includes load, start-up output and DC power.

[0031] The step 2 includes the following steps:

[0032] Step 2-1: The simulated DC power fluctuates for a duration of t. After the weak receiving end grid frequency drops to frequency f, the bipolar DC is blocked and the load shedding is safely controlled. In the initial state, t=0, and then go to step 2- 2;

[0033] Step 2-2: Determine whether the lowest frequency of the weak rece...

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PUM

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Abstract

The invention provides a lock-up control method for the DC (Direct Current) power fluctuation of a weak AC (Alternating Current) receiving power grid. The method comprises the following steps of determining the operating way of the power grid; determining the lock-up control motion frequency fixed value of the DC power fluctuation; and performing the lock-up control of the DC power fluctuation. According to the lock-up control method for the DC power fluctuation of the weak AC receiving power grid, when the DC power is fluctuated and the grid frequency at the weak AC receiving end is reduced to a limiting frequency, a direct current system is bipolarlly locked to guarantee a underfrequency load shedding device at a third line of defense to be failure to actuate after a correct operation is safely controlled, the grid frequency collapse can be prevented due to the fact that the weak AC receiving power grid bears larger power vacancy but any measure is not adopted, and an AC receiving system can be guaranteed to stably operate; and meanwhile, overall process monitoring during a direct current power fluctuation period can be realized and false operation can be prevented by setting a starting criterion, a motion criterion and an exit criterion.

Description

Technical field [0001] The invention relates to a control method, in particular to a method for blocking control of DC power fluctuations of a weak receiving end power grid. Background technique [0002] The direct current transmission system is mainly used in the field of high voltage direct current transmission control and protection. Provide complete sets of control and protection equipment and technology for long-distance high-voltage DC transmission projects, back-to-back networking projects, UHV DC transmission projects, etc. The DPS-2000 control and protection system adopts a hierarchical distributed redundant design, including operator control layer and control protection layer And on-site control layer. The operator control system adopts cross-platform technology of UNIX server and Windows workstation, as well as dual LAN network bus topology and firewall design. [0003] The DC transmission system has the advantages of stability, safety and reliability, flexible configu...

Claims

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Application Information

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IPC IPC(8): H02J1/00
Inventor 罗煦之罗建裕王安斯李海峰李汇群张健刘明松
Owner STATE GRID CORP OF CHINA
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