Voltage Violation Risk Assessment and Pre-Control in Active Distribution Network Considering Uncertainty

doi:10.16628/j.cnki.2095-8188.2022.02.012

Abstract

Abstract:

Aiming at the voltage violation risk caused by the uncertainty of DGs and loads in short-term operation,a voltage violation risk assessment and pre-control method of active distribution network (ADN) is proposed.The voltage violation risk assessment index is established.The stochastic power flow solution based on cumulant and gram-charlier series expansion is applied to calculate the risk index.When the risk exceeds the threshold,pre-control is carried out to improve the system operation security.Considering the active and reactive power of distributed energy resources,flexible loads management and traditional reactive and voltage equipment,a voltage violation risk pre-control model based on multi-level active management is proposed.Based on harmony search algorithm,a model solving strategy is formulated.The proposed method is applied to evaluate and pre-control the voltage violation risk of ADN,which realizes the accurate identification of key weak nodes and effective risk control.

Key words: active distribution network(ADN), operation risk assessment, voltage violation, pre-control, probabilistic power flow

CLC Number:

TM732

LIAO Jianbo, CHEN Bo, CHEN Yuanwei, YU Wei, CHEN Jiancong, LIN Dazeng, ZHANG Lu, NAN Dongliang. Voltage Violation Risk Assessment and Pre-Control in Active Distribution Network Considering Uncertainty[J]. LOW VOLTAGE APPARATUS, 2022, 0(2): 74-82.

Figures/Tables 12

References 13

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优先等级	主动管理手段	特点	备注
I级	可控DG无功、风光DG无功、储能无功调度	无功调度,不需要调整有功调度计划	优先执行
II级	可控DG有功、储能有功、柔性负荷调度	有功修正,小幅度修正调度计划	有必要时执行
III级	风光DG有功削减	弃风光,不符合ADN价值	尽可能少执行
IV级	OLTC调档、并联电容器组投切	长时间尺度动作元件,频繁调节不利设备寿命和系统稳定	尽可能不执行

时段	节点编号	电压越限风险/×10^-4
8	15	2.78
8	16	5.00
14	14	2.84
	15	4.03
	16	3.89

优先等级	主动管理手段	预控修正值/Mvar
I级	微燃机无功	—(停机)
	风机无功	0.287 0
	光伏无功	0.031 9
	风储无功	0.076 3

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