Reliability Calculation Method for Island Microgrid Considering Electric Vehicle Charging Demand

doi:10.12204/j.issn.1000-7229.2020.11.005

Abstract

Abstract:

The microgrids on independent islands mostly operate in island mode due to the long distance to the mainland, and the power supply and demand keep balanced inside the microgrid. At the same time, the charging load of electric vehicles (EVs) has affected the reliable operation of the island microgrid. A method for calculating the reliability of island microgrid that takes into account the EV charging demand is proposed. Firstly, an EV charging load model based on trip chain theory is established by simulating the travel behavior of users; taking into account the characteristics of wind power and energy storage, a microgrid operation strategy and a load reduction strategy are proposed. Then, taking the charging demand of electric vehicles into account, new indexes such as the Annual Average Charge Interruptions and the Average Service Availability Index are proposed, which constructed a reliability evaluation system for microgrids different from that for the traditional distribution network. Finally, the method proposed is tested by the improved RBTS Bus 6 feeder F4 system, which shows that the microgrid operation strategy and electric vehicles charging demand have a significant impact on the island microgrid reliability, which proves the effectiveness of the method.

Key words: electric vehicle, island microgrid, load reduction, power supply reliability, Monte Carlo

CLC Number:

TM73

LIANG Haifeng, LI Ziyang, GUO Jie. Reliability Calculation Method for Island Microgrid Considering Electric Vehicle Charging Demand[J]. ELECTRIC POWER CONSTRUCTION, 2020, 41(11): 49-59.

Figures/Tables 21

Fig.1 Structure of trip chain

Fig.2 Main attributes in NHTS 2017 dataset

Fig.3 Structure of a microgrid

Fig.4 Output power changes of a wind power generator in 7 days

Fig.5 Diagram of the operation strategy of the island microgrid

Table 1 Importance index of each load block

Fig.6 Flow chart of sequential simulation

Table 2 Reliability parameters of components

Table 3 Parameters of EVs in the microgrid

Table 4 Proportion of trip purposes

Table 5 Distribution parameters of the first departure time of a day

Table 6 Distribution parameters of driving duration

Fig.7 Comparison of trip mileage of original and simulated data

Fig.8 Failure rate of load points

Fig.9 Average power outage time of load points

Table 7 Reliability indexes of island microgrid

Table 8 Comparison of economic indexes

Fig.10 Comparison of load point failure rates between considering and not considering EV charging load

Fig.11 Comparison of load point average power outage time between considering and not considering EV charging load

Table 9 Comparison of reliability indexes of island microgrid with or without EV charging load

Table 10 Comparison of microgrid reliability indexes under grid-connected and island modes

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