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Receiving end power grid phase modifier dispatching method considering short-circuit current and system frequency voltage risks

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., can solve problems such as aggravating the difficulty of operating mode arrangement, and achieve the effect of improving flexibility

Active Publication Date: 2018-02-27
NARI TECH CO LTD +3
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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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  • Receiving end power grid phase modifier dispatching method considering short-circuit current and system frequency voltage risks
  • Receiving end power grid phase modifier dispatching method considering short-circuit current and system frequency voltage risks
  • Receiving end power grid phase modifier dispatching method considering short-circuit current and system frequency voltage risks

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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 receiving end power grid phase modifier dispatching method considering short-circuit current and system frequency voltage risks, and belongs to the technical field of electric power systems and automation thereof. During direct-current long-term non-full-power operation, receiving end power grid frequency voltage risks are greatly reduced than risks during direct-currentfull-power operation, and possibility is provided for exiting a phase modifier. System frequency instability risks generated after the phase modifier on a direct-current inverter side exits are quantitatively evaluated, a voltage instability risk index of the product of a voltage weak region power receiving rate and a voltage instability fault set change after the phase modifier exits is defined,and a comprehensive scheduling sequence and strategies of exiting the phase modifier under a typical operation mode are obtained by considering contributions of phase modifier exiting to the short-circuit current and maintenance loss cost. By means of the method, power system planning operation personnel can control safe stable operation risks of alternating-current and direct-current power gridsafter exiting the phase modifier in advance easily, and the flexibility of operation mode arrangement is improved.

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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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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