Reliability Evaluation of Distribution Network Considering Demand Response and Road-Electricity Coupling Characteristics of Electric Vehicle Load

doi:10.12204/j.issn.1000-7229.2021.06.009

Abstract

Abstract:

With the popularity of electric vehicles (EVs), a large number of disorderly charging behaviors have a negative impact on the reliability of the distribution network. In this paper, a reliability evaluation model of distribution network considering demand response and road-electricity coupling characteristics is established to accurately predict and dispatch the spatiotemporal distribution load of electric vehicles, so as to improve the reliability index. Firstly, the road-electricity coupling model structure and the time-space load forecasting framework are proposed. Then the road network model, user model, and charging load supplement model considering demand response are given, and the space-time distribution of electric vehicle load is obtained. Finally, evaluation based on the two-way hierarchical structure and heuristic reduction strategy is carried out for the reliability of the distribution network where the EVs connect. Taking a regional road-electricity coupling network as an example, the temporal and spatial distribution of private EV charging load in this area is analyzed and the reliability of the distribution network considering demand response and road-electricity coupling characteristics is evaluated. Simulation results in various scenarios verify the effectiveness of the proposed model, the optimization effect of demand response on reliability index, and the deterioration effect of road-electricity coupling characteristics on the reliability index.

Key words: road-electricity coupling, electric vehicle, charging load, demand response, reliability evaluation

CLC Number:

TM712

LIN Mingrong, HU Zhijian, GAO Mingxin, CHEN Jinpeng. Reliability Evaluation of Distribution Network Considering Demand Response and Road-Electricity Coupling Characteristics of Electric Vehicle Load[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(6): 86-95.

Figures/Tables 19

Fig.1 Structure chart of road-electricity coupling model and space-time load forecasting framework

Table 1 Travel chain structure

Fig.2 Time-space load forecasting flow chart of Monte Carlo electric vehicle

Fig.3 Flow chart of reliability evaluation based on bi-directional hierarchy

Fig.4 Example of urban road network

Fig.5 Wiring diagram of IEEE RBTS Bus6 system

Fig.6 Spatial and temporal distribution of charging loads in different typical day

Fig.7 Regional total load curve under different typical days and conditions

Table 2 Values of system reliability indices in different scenarios

Fig.8 Load and wind power output in island 1

Table 3 Reliability index of each node in island 1

Fig.9 Load distribution of each node in different scenarios

Table 4 Influence of road-electricity coupling characteristics on reliability

Table A1 Road length data

Table A2 WTG parameters

Table A3 Corresponding table of node number between road network and distribution network

Table A4 EV parameters

Table A5 Travel chains of different types of day and their proportions

Table A6 Electricity price level of each period元/(kW·h)

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