交直流混合电力系统的安全校正策略

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Abstract With the rapid development of AC-DC hybrid power system,the risk of cascading failures caused by DC block or line tripping is also increasing.Relevant control measures should be taken to avoid further overload according to the operation status of power grid.In smart grid,HVDC and thyristor controlled series capacitor (TCSC) can also be taken as control measures to further reduce the amount of load shedding.The sensitivity and optimization based methods are often utilized to formulate the security correction strategies.The sensitivity based method functions well in online generation rescheduling and load shedding.However,the power flow sensitivities of DC power and TCSC reactance are discovered to vary according to control variable rather than being constant.So it’s difficult for the sensitivity based method to be applied to security correction strategy of AC/DC hybrid power system.A modified optimization method,which uses heuristic search principle,is proposed against the defects of excessive optimization variables and heavy computational burden,which results in the limitation for online application.Based on load shift factor(LSF),few generator and load nodes are rapidly selected to control overload effectively.Aiming at the minimum amount of load shedding,an optimization model is proposed,in which HVDC power and reactance of TCSC,in addition to the power of the selected nodes are taken as optimization variables.Intelligent optimization algorithm is adopted to obtain security correction scheme.Based on modified IEEE 30-node benchmark,the validity and superiority of the proposed method is verified by comparing the result obtained by the proposed method with those without utility of heuristic search or without taking DC power and TCSC reactance into consideration.

Key words： Cascading failures security correction thyristor controlled series capacitor(TCSC)

Received: 14 April 2015 Published: 07 July 2016

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	Articles by authors
	Bi Ruyu
	Lin Tao
	Chen Rusi
	Xu Xialing
	Ye Jing

Cite this article:

Bi Ruyu,Lin Tao,Chen Rusi等. The Security Correction Strategy in AC and DC Hybrid Power System[J]. Transactions of China Electrotechnical Society, 2016, 31(9): 50-57.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I9/50

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