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AC/DC coordinated control method and system for integrated control of AC tie-line power change

An AC tie line and integrated control technology, applied in the field of AC and DC coordinated control methods and systems, can solve problems such as long operation period, system instability, and difficulty in meeting the stability control of cross-regional power grids, so as to suppress power fluctuations and avoid adjustment disorders , Improve the effect of transient and dynamic stability characteristics

Active Publication Date: 2015-10-28
STATE GRID CORP OF CHINA +1
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AI Technical Summary

Problems solved by technology

However, if the system oscillation is caused by some uncertain fault that leads to a power shortage in the regional power grid (such as shutdown, DC blocking, etc.), when the system oscillation gradually subsides, the AC power grid may still be in an unsafe state. The transmission power of the tie line is close to or exceeds the transient / static limit, and at this time the DC modulation function no longer operates, which may cause the system to lose stability
[0006] For the power shortage of the regional power grid caused by uncertain faults, the power grid is usually adjusted through low-cycle load shedding, AGC (automatic generation control) or frequency modulation of the direct current transmission system, but these methods usually have a long operating cycle , The response is slow, and it is difficult to meet the requirements of the cross-regional power grid for stability control

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  • AC/DC coordinated control method and system for integrated control of AC tie-line power change
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  • AC/DC coordinated control method and system for integrated control of AC tie-line power change

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Embodiment 1

[0046] The invention of this example provides an AC-DC coordinated control method and system for comprehensive control of AC tie line power changes. The AC-DC coordinated control method for comprehensive control of AC tie line power changes includes the following steps as shown in the figure:

[0047] Step 1: Calculate the DC power modulation value P by using the DC power modulation method of the composite AC section power over-limit control mod And power emergency increase or decrease amount P emg ;

[0048] Step 2: For DC power modulation P mod and power emergency boost or drop amount P emg to distribute;

[0049] Step 3: Comprehensively control the power fluctuation of the AC tie line through the power control of multiple DC circuits.

[0050] Step 1: Calculate the DC power modulation value P by using the DC power modulation method of the composite AC section power over-limit control mod And the power emergency increase / return amount P emg :

[0051] The invention ai...

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Abstract

The invention relates to an AC / DC coordinated control method and system for integrated control of AC tie-line power change. The method comprises: calculating the DC power modulation amount Pmod and the power urgent promotion or fall-back amount Pemg; distributing the DC power modulation amount Pmod and the power urgent promotion or fall-back amount Pemg; and performing integrated control of AC tie-line power change via control of multi-circuit DC power. According to the technical scheme provided in the invention, by modulating the power of a multi-circuit DC transmission system and urgently prompting or reducing the power, power fluctuation and power threshold-crossing of trans-regional AC tie-lines are inhibited.

Description

Technical field: [0001] The invention relates to the field of large power grid security, and more particularly relates to an AC-DC coordinated control method and system for comprehensive control of power variation of AC tie lines. Background technique: [0002] With the construction of the UHV AC synchronous power grid and EHV / UHV DC transmission projects, the State Grid has gradually formed a complex AC system characterized by parallel operation of AC and DC, centralized power supply / converter stations at the sending end, and multi-infeed DC at the receiving end. DC power grid. The formation of the AC-DC hybrid operation grid has brought new challenges to the security and stability control of the power system, and it also provides the possibility of using the AC-DC coordinated control method to improve the security and stability of the grid. [0003] For the network frame structure with a single AC channel between the regional grids, a failure of either side of the grid ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00
Inventor 胡涛张晋华张文朝吴子平王亮雷霄刘耀
Owner STATE GRID CORP OF CHINA
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