Cooperative Evaluation of Power Supply Reliability of Medium and Low Voltage Distribution Network Considering Multiple Terminal Configurations

doi:10.12204/j.issn.1000-7229.2022.02.007

Abstract

Abstract:

Aiming at the problems that the existing reliability evaluation methods of distribution network cannot fully evaluate low voltage system and the types of distribution terminals are not comprehensively considered, a collaborative evaluation method for medium and low voltage reliability considering multiple terminal configurations is proposed. Firstly, the basic idea of reliability collaborative evaluation of medium and low voltage distribution network is explained from three aspects: evaluation object, evaluation index and evaluation framework. Secondly, combining with the concept of feeder partition and considering the influence of various terminals on power supply reliability, the fault finding and impact analysis logic based on multi-module intelligent terminal device configuration is established. Thirdly, combined with the proposed fault analysis logic, a low- and medium-voltage Monte Carlo reliability assessment method based on collaborative analysis of different voltage levels is proposed. Finally, taking the IEEE RBTS BUS-2 system as an example, a comparative analysis of the system reliability levels in different scenarios is carried out to verify the effectiveness of the method.

Key words: distribution network reliability, collaborative evaluation, distribution automation, low voltage distribution network

CLC Number:

TM712

LIU Yanru, LIU Hong, GU Yi, HAN Liu, HUA Xuejiao. Cooperative Evaluation of Power Supply Reliability of Medium and Low Voltage Distribution Network Considering Multiple Terminal Configurations[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(2): 54-62.

Figures/Tables 14

Fig.1 Collaborative reliability evaluation framework for medium and low voltage distribution networks

Fig.2 Feeder partitions containing multi-module intelligent terminal devices

Fig.3 Flowchart for finding and analyzing the impact of feeder segment fault

Table 1 Type of minimum isolation area when fault point is at ①—⑥

Fig.4 IEEE RBTS BUS-2 power distribution system with multiple terminals

Table 2 Component reliability parameters

Table 3 User basic parameters

Fig.5 Structure of typical low-voltage distribution network

Table 4 System reliability indicators in 2 scenarios

Table 5 Reliability parameters of the 400 V bus

Table 6 Reliability parameters of low-voltage station

Table 7 Reliability index calculation results of sequential evaluation and collaborative evaluation for medium and low voltage

Table 8 System reliability indicators and total annual costs in 4 scenarios

Table 9 Reliability index of feeder 1 befor and after connecting photovoltaic

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