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A dispatching method for receiver-end power grid condensers considering the risks of short-circuit current and system frequency and voltage

A technology of short-circuit current and system frequency, applied in the direction of AC network voltage adjustment, power network operating system integration, information technology support system, etc.

Active Publication Date: 2021-03-12
NARI TECH CO LTD +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the contribution of the condenser to the short-circuit current of the nearby 500kV station is about 1.5-3.5kA, this will undoubtedly increase the difficulty of operating mode arrangements for the local receiving-end power grid that originally faced the risk of short-circuit current exceeding the standard

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  • A dispatching method for receiver-end power grid condensers considering the risks of short-circuit current and system frequency and voltage
  • A dispatching method for receiver-end power grid condensers considering the risks of short-circuit current and system frequency and voltage
  • A dispatching method for receiver-end power grid condensers considering the risks of short-circuit current and system frequency and voltage

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Embodiment Construction

[0043] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0044] figure 1 Step 1 in the above describes, for each DC, calculate the DC effective short-circuit ratio and the multi-feed DC interaction factor after the operation mode is changed, and determine the DC commutation failure risk of the location where the condenser is connected. The critical DC power that bears multiple commutation failures determines the risk of DC blocking, and the risk of system frequency instability after exiting the condenser is obtained by integrating the risk of DC commutation failure and DC blocking risk. Specifically include the following steps:

[0045] Step 1-1 describes that the AC system at the receiving end has L 1 , L 2 ,...,L n ,...,L m A total of m circuits of DC, of ​​which the inverter side of the n circuits of DC feed-in are equipped with condensers, and the DC transmission power in the system operation mo...

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Abstract

The invention discloses a dispatching method for a receiver-end power grid condenser considering short-circuit current and system frequency and voltage risks, and belongs to the technical field of power systems and automation thereof. The invention aims at the long-term non-full power operation of the direct current, and the frequency and voltage risk of the power grid at the receiving end is greatly reduced compared with the full power operation of the direct current, and provides the possibility of withdrawing from the condenser. Quantitatively evaluate the risk of system frequency instability after exiting the DC inverter side condenser, define the voltage instability risk index of the product of the power receiving ratio in the voltage weak area and the voltage instability fault set change after exiting the condenser, and comprehensively exit the condenser for short-circuit current and Based on the contribution of maintenance loss costs, the comprehensive dispatching order and strategy of exiting condensers in typical operation modes are obtained. The invention is beneficial to electric power system planning and operating personnel to grasp in advance the risk of safe and stable operation of the AC and DC power grid after the condenser withdraws, and improves the flexibility of operating mode arrangement.

Description

technical field [0001] The invention belongs to the technical field of electric power system and automation thereof. More precisely, the invention relates to a dispatching method of a receiver-end power grid concentrator considering the risks of short-circuit current and system frequency and voltage. Background technique [0002] As the construction progress of the supporting power supply of the sending-end power grid lags behind, the strength of the receiving-end DC multi-infeed system gradually weakens. There are a total of ten circuits of DC feed-in, with a total rated capacity of 57.76 million kilowatts, which is close to 25% of the average summer peak load in East China and about 40% of the low-peak load in the flood season. The capacity reaches 21.6 million kilowatts. From the perspective of system security and stable operation risks, the replacement effect of power from outside the area on the power supply in the network is intensified, and the local adjustment abili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14
CPCH02J3/14Y02B70/3225Y04S20/222
Inventor 张红丽刘福锁王超李威侯玉强罗剑波王玉崔晓丹黄志龙曹路李建华李海峰庄侃沁罗凯明张倩潘彤顾晓玲
Owner NARI TECH CO LTD
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