Reliability Analysis of Integrated Energy Cyber Physical System Considering Real-Time Demand Response

doi:10.12204/j.issn.1000-7229.2020.12.003

Abstract

Abstract:

With the rapid development of information and communication technologies, the coupling between energy network and information network is deepening, and the implementation of real-time demand response has received effective technical support. In order to find out the impact of information network and demand response technologies on the reliability of integrated energy system, this paper proposes a reliability assessment method for energy-information coupled system taking into account real-time demand response. Firstly, the framework of integrated energy cyber physical system (CPS) and its real-time demand response mechanism are introduced. Secondly, considering the reliability model for information transmission, the hybrid Monte Carlo method is used for component states simulation and multi-period failure scenarios simulation. Thirdly, the state variables of components are incorporated into the energy balance constraints and optimal load reduction model with the objective of minimizing the costs of energy purchase, load reduction and demand response is established. Then, the reliability assessment indices and evaluation process of integrated energy cyber physical system are proposed. Finally, the effect of real-time demand response, physical domain components and information domain components on reliability is analyzed, and the importance of physical components and information components is quantified. The results show that different components have different effects on the reliability of integrated energy CPS and real-time demand can effectively improve its operating economy and reliability; the method proposed can effectively identify weak links in the physical domain and information domain of energy CPS. The results can provide a reference for the economic operation and enhancement construction of energy CPS.

Key words: integrated energy system, cyber physical system, real-time demand response, reliability assessment

CLC Number:

TM73

WANG Lanling, LIU Junyong, XU Lixiong, HE Xinda, TANG Jie, FANG Gang. Reliability Analysis of Integrated Energy Cyber Physical System Considering Real-Time Demand Response[J]. ELECTRIC POWER CONSTRUCTION, 2020, 41(12): 25-40.

Figures/Tables 31

Fig.1 The architecture of an integrated energy cyber physical system

Fig.2 Topology diagram of information element connection

Fig.3 Reliability assessment process of IECPS

Fig.4 Physical framework of the integrated energy system

Table 1 Different scenarios of integrated energy cyber physical system

Table 2 Energy supply reliability index under different scenarios

Table 3 Proportion of information system failures%

Fig.5 Power supply importance index

Fig.6 Heat supply importance index

Fig.7 Cooling importance index

Fig.8 Importance index of integrated energy supply

Fig.9 Annual average costs for different scenarios

Fig.10 Impact of component failure rate

Fig.11 Analysis of contribution rate of energy shortage

Table 4 Energy supply reliability index under different load factor

Table A1 Energy conversion device parameters

Table A2 Energy storage device parameters

Table A3 Superior grid parameters and gas network parameters

Table A4 Reliability parameters of energy CPS components

Fig.A1 Typical daily power output of distributed generation

Fig.A2 Load factor of Spring

Fig.A3 Load factor of Summer

Fig.A4 Load factor of Fall

Fig.A5 Load factor of Winter

Fig.A6 Information element connection topology diagram

Fig.B1 Energy supply importance index of scenario 1

Fig.B2 Energy supply importance index of scenario 3

Fig.B3 Energy supply importance index of scenario 4

Fig.B4 Annual average costs for scenario 1 and 3

Fig.B5 Sensitivity analysis of communication line failure rate

Table B1 Energy supply reliability index of switches and information terminals

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