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DC power real-time liftable capability calculation method

A technology of DC power and calculation method, applied in the direction of AC network circuit, power transmission AC network, emergency treatment AC circuit layout, etc., can solve the problems of DC commutation failure, deterioration of system voltage, etc., to avoid mismatch and improve transient state The effect of stability

Active Publication Date: 2017-11-10
NARI TECH CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need for a large amount of reactive power support for emergency boosting of DC power, unreasonable DC boosting commands may deteriorate the system voltage and even cause DC commutation failure

Method used

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  • DC power real-time liftable capability calculation method
  • DC power real-time liftable capability calculation method
  • DC power real-time liftable capability calculation method

Examples

Experimental program
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Embodiment 1

[0055] The basic principle of this embodiment is: based on the current operation mode of DC, determine the real-time power increase capability. On the one hand, after the DC power is increased, the flow of the DC near-area cross-section exceeds the transmission power limit, destroying the safe and stable operation of the AC power grid, and on the other hand. On the one hand, in the process of DC emergency power support, because the AC voltage of the converter station is too low, it is not enough to maintain the DC current to follow the output current setting value of the DC power regulating device, resulting in the actual boosted power of the DC not reaching the standard, or even caused by a large drop in voltage. The problem of commutation failure. On the premise of considering the DC overload capacity, the method comprehensively considers the constraints of the AC system and the operation mode of the DC itself, and calculates the real-time maximum boostable capacity of the DC...

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PUM

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Abstract

The invention discloses a DC power real-time liftable capability calculation method and belongs to the electric power system and automation technology field. According to the method, based on the present DC operation conditions, overload capability determined by DC itself characteristics and section bearing capability of an AC power grid sending end and receiving end of an AC power grid are comprehensively considered, including power flow dispersion capability, transient stabilization capability and real-time power maximum transmission capability limited by AC voltage supporting capability and a present trigger angle value at a rectification side, and DC power real-time liftable capability can be determined. The method is advantaged in that an effective controlled variable is provided for realizing power emergency support, the DC modulation function is guaranteed to be effectively performed, a power unbalance problem of a power grid is alleviated, and power grid safety stability is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a calculation method for the real-time boostability of DC power. Background technique [0002] At present, many regions in my country have formed a multi-DC feed-in network structure. Using the emergency power support (EDCPS) capability of the DC system, compared with other emergency control measures for the AC system, has a great impact on improving the AC system under high-power impact disturbance. Transient stability, the control cost is smaller, and the control is faster and more reliable. However, there is no clear calculation method for the real-time boostability of DC power. Generally, only the overload capacity of DC transmission can be obtained. The long-term maximum overload current is generally 1.1 times the rated current; the transient overload capacity can reach 1.5 times the rated current. The current can...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/36H02J3/06
CPCH02J3/00H02J3/001H02J3/06H02J3/36H02J2203/20Y02E60/60
Inventor 吴雪莲李兆伟方勇杰刘福锁李威李碧君黄慧王燕君张子龙谭真崔晓丹侯玉强
Owner NARI TECH CO LTD
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