Optimal Dispatch of Cross-Regional Integrated Electricity-Gas System with HVDC and P2G

doi:10.12204/j.issn.1000-7229.2020.12.006

Abstract

Abstract:

Long-distance DC transmission and power conversion and storage are important means to achieve high proportion consumption of renewable energy. Considering the cooperation between cross-regional high-voltage direct current (HVDC) and intra-regional power to gas (P2G), a cross-regional integrated electricity-gas system optimized dispatch strategy for large-scale wind power consumption is proposed. First of all, in view of the problem that independent preparation of the HVDC power transmission plan is difficult to match the strong randomness of wind power, an stepped operation optimization model for HVDC is established. At the same time, considering the anti-peak regulation characteristics of wind power, it is proposed to use P2G for large-scale wind power conversion and to realize indirect storage cooperate with line storage of gas system. Then, considering the safety constraints such as the system voltage stability, the day-ahead optimal dispatch model is established with the goal of optimal system operation economy, the linear power flow algorithm with high voltage accuracy, and the piecewise linearization method are used to address the non-convex and nonlinear model. Finally, the effectiveness and economy of the proposed strategy are verified by several simulation results.

Key words: cross-regional integrated electricity-gas system, high-voltage direct current(HVDC), power to gas(P2G), line storage, linearization, wind power accommodation

CLC Number:

TM71

LIU Fengquan, WANG Chengfu, WANG Ruiqi, YANG Ming, GUO Guanghua, ZHANG Jian, DU Pingjing. Optimal Dispatch of Cross-Regional Integrated Electricity-Gas System with HVDC and P2G[J]. ELECTRIC POWER CONSTRUCTION, 2020, 41(12): 57-67.

Figures/Tables 18

Fig.1 Dispatch plan for power grid

Fig.2 Diagram of transmission in pipeline

Fig.3 Power transmission of the DC line

Fig.4 Wind power abandonment of the system

Table 1 Influence of the HVDC operation mode

Table 2 Influence of the P2G and line storage

Fig.5 Power consumption of the P2G

Fig.6 Changes in the line storage of the system

Table 3 Influence of the P2G operation cost

Fig.A1 Structure of the interconnection system

Table A1 Parameters of wind power units

Table A2 Parameters of gas power units

Table A3 Parameters of conventional generators

Table A4 Parameters of gas compressors

Table A5 Parameters of P2G units

Table A6 Parameters of gas wells

Table A7 Parameters of the HVDC

Fig.A2 Forecast loads and wind power on a typical winter day

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